东秦岭大蛇沟钨矿区赋矿围岩成因:锆石U-Pb年代学和地球化学证据

doi:10.19657/j.geoscience.1000-8527.2021.114

摘要/Abstract

摘要：

大蛇沟钨矿床是东秦岭杨斜—丰北河金钨成矿带一处典型的石英脉型钨矿床,矿体赋存于杨斜片麻岩套的NE—NEE向构造破碎带内。LA-ICP-MS锆石U-Pb定年结果显示,赋矿含斑眼球状斜长片麻岩的加权平均年龄为(434.2±1.6) Ma (MSWD=0.022, n=24),表明原岩形成于早志留世。地球化学研究表明:岩石属于高钾钙碱性准铝质I型花岗岩类,相对富集Rb、Ba、K、Pb、Sr等大离子亲石元素和轻稀土元素(LREE),亏损Nb、Ta、P、Ti等高场强元素和重稀土元素(HREE),具岩浆弧岩浆岩特征。此外,高Sr、高Sr/Y和La/Yb、低Y和低Yb及弱Eu正异常等特征参数,与典型埃达克岩一致;推测岩浆源于加厚下地壳石榴石角闪岩的部分熔融,形成于早古生代商丹洋向北秦岭板块俯冲的活动大陆边缘弧环境。

关键词: 锆石U-Pb定年, 地球化学, 含斑眼球状斜长片麻岩, 大蛇沟钨矿床, 东秦岭

Abstract:

The Dashegou is a typical quartz-vein type tungsten deposit in the Yangxie-Fengbeihe Au-W metallogenic belt, East Qinling Orogen. The orebodies occur in the NE-ENE-striking faults of the Yangxie gneissic suite. LA-ICP-MS zircon U-Pb dating yielded a weighted average age of (434.2±1.6) Ma (MSWD=0.022, n=24) for the porphyroblastic augen plagiogneiss, indicating that the protolith was formed in the Early Silurian. Whole-rock geochemical data show that the plagiogneiss belongs to high-K calc-alkaline peraluminous I-type granitoids, and is relatively enriched in large ion lithophile elements (LILEs, e.g., Rb, Ba, K, Pb, Sr) and LREEs, and depleted in high field strength elements (HFSEs, e.g., Nb, Ta, P, Ti) and HREEs. In addition, the rocks have high Sr, high Sr/Y and La/Yb, low Y and low Yb, and weakly positive Eu anomalies, resembling typical adakites. This indicates that the parental magma was probably derived from partial melting of garnet amphibolite in the thickened lower crust. Considering also the regional tectonic setting, it is inferred that protolith of the porphyroblastic augen plagiogneiss was formed by island arc magmatism during the Early Paleo-zoic north-dipping subduction of the Shangdan Ocean beneath the North Qinling plate.

Key words: zircon U-Pb dating, geochemistry, porphyroblastic augen plagiogneiss, Dashegou tungsten deposit, East Qinling

中图分类号:

P618.67
P597

葛战林, 郝迪, 张晓星, 郑艳荣, 李晓东, 武海文, 张龙. 东秦岭大蛇沟钨矿区赋矿围岩成因:锆石U-Pb年代学和地球化学证据[J]. 现代地质, 2021, 35(06): 1633-1650.

GE Zhanlin, HAO Di, ZHANG Xiaoxing, ZHENG Yanrong, LI Xiaodong, WU Haiwen, ZHANG Long. Petrogenesis of Host Rocks in the Dashegou Tungsten Orefield, East Qinling Orogen: Evidences from Zircon U-Pb Geochronology and Geochemistry[J]. Geoscience, 2021, 35(06): 1633-1650.

图/表 17

参考文献 97

[1]	MATTAUER M, MATTE P, MALAVIEILLE J, et al. Tectonics of the Qinling Belt: Build-up and evolution of eastern Asia[J]. Nature, 1985, 317:496-500. DOI URL
[2]	张国伟, 孟庆任, 于在平, 等. 秦岭造山带的造山过程及其动力学特征[J]. 中国科学(D辑:地球科学), 1996, 26(3):193-200.
[3]	WU Y B, ZHENG Y F. Tectonic evolution of a composite collision orogen: An overview on the Qinling-Tongbai-Hong'an-Dabie-Sulu orogenic belt in central China[J]. Gondwana Research, 2013, 23(4):1402-1428. DOI URL
[4]	DONG Y P, SANTOSH M. Tectonic architecture and multiple orogeny of the Qinling Orogenic Belt, Central China[J]. Gondwana Research, 2016, 29(1):1-40. DOI URL
[5]	HU F Y, LIU S W, DUCEA M N, et al. The geochemical evolution of the granitoid rocks in the South Qinling Belt: Insights from the Dongjiangkou and Zhashui intrusions, central China[J]. Lithos, 2017, 278/279/280/281:195-214.
[6]	陈毓川, 王平安, 秦克令, 等. 秦岭地区主要金属矿床成矿系列的划分及区域成矿规律探讨[J]. 矿床地质, 1994, 13(4):289-298.
[7]	朱赖民, 张国伟, 李犇, 等. 与秦岭造山有关的几个关键成矿事件及其矿床实例[J]. 西北大学学报(自然科学版), 2009, 39(3):381-391.
[8]	陈衍景. 秦岭印支期构造背景、岩浆活动及成矿作用[J]. 中国地质, 2010, 37(4):854-865.
[9]	姚书振, 丁振举, 周宗桂, 等. 秦岭造山带金属成矿系统[J]. 地球科学, 2002, 27(5):599-604.
[10]	朱赖民, 张国伟, 李犇, 等. 秦岭造山带重大地质事件、矿床类型和成矿大陆动力学背景[J]. 矿物岩石地球化学通报, 2008, 27(4):384-390.
[11]	葛战林, 郑艳荣, 郝迪, 等. 东秦岭杨斜—丰北河成矿带杨屋场钨(金)矿床地质特征及成因探讨[J]. 西北地质, 2020, 53(3):140-152.
[12]	赵峰, 曹泽高, 王延华, 等. 曹家坪幅I-49-75-D红岩寺幅I-49-76-C 1/5万区域地质调查报告[R]. 咸阳: 陕西省地矿局区域地质调查队, 1984.
[13]	李靠社, 白胜利, 李宗科, 等. 杨斜镇幅I49E013007 1/5万区域地质图说明书[R]. 商洛: 陕西省地矿局13地质队, 1995.
[14]	张国伟, 张本仁, 袁学诚, 等. 秦岭造山带与大陆动力学[M]. 北京: 科学出版社, 2001: 1-855.
[15]	杨力, 陈福坤, 杨一增, 等. 丹凤地区秦岭岩群片麻岩锆石U-Pb年龄: 北秦岭地体中—新元古代岩浆作用和早古生代变质作用的记录[J]. 岩石学报, 2010, 26(5):1589-1603.
[16]	赵东宏, 杨忠堂, 李宗会. 秦岭成矿带成矿地质背景及优势矿产成矿规律[M]. 北京: 科学出版社, 2019: 1-401.
[17]	裴先治, 李厚民, 李国光. 东秦岭丹凤岩群的形成时代和构造属性[J]. 岩石矿物学杂志, 2001, 20(2):180-188.
[18]	SUN W D, LI S G, SUN Y, et al. Mid-Paleozoic collision in the north Qinling: Sm-Nd, Rb-Sr and ⁴⁰Ar/ ³⁹Ar ages and their tectonic implications[J]. Journal of Asian Earth Sciences, 2002, 21(1):69-76. DOI URL
[19]	陕西省地质调查院. 中国区域地质志·陕西志[M]. 北京: 地质出版社, 2017: 1-1120.
[20]	李万生. 杨斜断裂以南元古代古侵入体的厘定及其地质意义[J]. 陕西地质, 1996, 14(2):22-32.
[21]	陈志宏, 陆松年, 李怀坤, 等. 北秦岭德河黑云二长花岗片麻岩体的成岩时代——TIMS和SHRIMP锆石U-Pb同位素年代学[J]. 地质通报, 2004, 23(2):136-141.
[22]	李曙光, 陈移之, 张宗清, 等. 北秦岭拉圾庙苏长辉长岩的痕量元素和Sr,Nd同位素地球化学[J]. 地质学报, 1993, 67(4):310-322.
[23]	刘军锋, 孙勇, 孙卫东. 秦岭拉鸡庙镁铁质岩体锆石LA-ICP-MS年代学研究[J]. 岩石学报, 2009, 25(2):320-330.
[24]	张宗清, 张国伟, 唐索寒, 等. 秦岭沙河湾奥长环斑花岗岩的年龄及其对秦岭造山带主造山期结束时间的限制[J]. 科学通报, 1999, 44(9):981-984.
[25]	孙卫东, 李曙光, CHEN Y D, 等. 南秦岭花岗岩锆石U-Pb定年及其地质意义[J]. 地球化学, 2000, 29(3):209-216.
[26]	胡健民, 崔建堂, 孟庆任, 等. 秦岭柞水岩体锆石U-Pb年龄及其地质意义[J]. 地质论评, 2004, 50(3):323-329.
[27]	弓虎军, 朱赖民, 孙博亚, 等. 南秦岭沙河湾、曹坪和柞水岩体锆石U-Pb年龄、Hf同位素特征及其地质意义[J]. 岩石学报, 2009, 25(2):248-264.
[28]	杨恺, 刘树文, 李秋根, 等. 秦岭柞水岩体和东江口岩体的锆石U-Pb年代学及其意义[J]. 北京大学学报(自然科学版), 2009, 45(5):841-847.
[29]	JIANG Y H, JIN G D, LIAO S Y, et al. Geochemical and Sr-Nd-Hf isotopic constraints on the origin of Late Triassic granitoids from the Qinling orogen, central China: Implications for a continental arc to continent-continent collision[J]. Lithos, 2010, 117(1/2/3/4):183-197. DOI URL
[30]	刘春花, 吴才来, 郜源红, 等. 南秦岭东江口、柞水和梨园堂花岗岩类锆石LA-ICP-MS U-Pb年代学与锆石Lu-Hf同位素组成[J]. 岩石学报, 2014, 30(8):2402-2420.
[31]	张国伟, 程顺有, 郭安林, 等. 秦岭-大别中央造山系南缘勉略古缝合带的再认识——兼论中国大陆主体的拼合[J]. 地质通报, 2004, 23(增):846-853.
[32]	罗旭. 陕西杨斜—丰北河地区金钨矿控脉(矿)断裂构造特征及演化与成矿关系分析[J]. 陕西地质, 1991, 9(1):1-9.
[33]	YAN Z, WANG Z Q, YAN Q R, et al. Devonian sedimentary environments and provenance of the Qinling orogen: Constraints on Late Paleozoic southward accretionary tectonics of the North China Craton[J]. International Geology Review, 2006, 48(7):585-618. DOI URL
[34]	王宗起, 闫全人, 闫臻, 等. 秦岭造山带主要大地构造单元的新划分[J]. 地质学报, 2009, 83(11):1527-1546.
[35]	罗旭, 卫旭辰, 王宗乾, 等. 陕西省杨斜—丰北河地区金、钨矿控矿构造特征及找矿方向研究报告[R]. 商洛: 陕西省地矿局13地质队, 1989.
[36]	LIU Y S, HU Z C, GAO S, et al. In situ analysis of major and trace elements of anhydrous minerals by LA-ICP-MS without app-lying an internal standard[J]. Chemical Geology, 2008, 257(1/2):34-43. DOI URL
[37]	周剑雄, 陈振宇. 电子探针下锆石阴极发光的研究[M]. 成都: 电子科技大学出版社, 2007: 1-104.
[38]	HOSKIN P W O, IRELAND T R. Rare earth element chemistry of zircon and its use as a provenance indicator[J]. Geology, 2000, 28(7):627-630. DOI URL
[39]	李长民. 锆石成因矿物学与锆石微区定年综述[J]. 地质调查与研究, 2009, 32(3):161-174.
[40]	HOSKIN P W O, SCHALTEGGER U. The composition of zircon and igneous and metamorphic petrogenesis[J]. Reviews in Mineralogy and Geochemistry, 2003, 53(1):27-62. DOI URL
[41]	李琦, 曾忠诚, 陈宁, 等. 阿尔金南缘新元古代盖里克片麻岩年代学、地球化学特征及其构造意义[J]. 现代地质, 2015, 29(6):1271-1283.
[42]	BELOUSOVA E A, GRIFFIN W L, O'REILLY S Y, et al. Igneous zircon: Trace element composition as an indicator of source rock type[J]. Contributions to Mineralogy and Petrology, 2002, 143(5):602-622. DOI URL
[43]	SHAW D M. The origin of the Apsley gneiss, Ontario[J]. Canadian Journal of Earth Sciences, 1972, 9(1):18-35. DOI URL
[44]	TARNEY J. Geochemistry of Archaean high-grade gneisses, with implications as to the origin and evolution of the Precambrian Crust[M]//WINDLEY B F.The Early History of the Earth.London:Wiley-Interscience, 1976: 405-417.
[45]	SIMONEN A. Stratigraphy and sedimentation of the Svecofennidic, early Archean supracrustal rocks in southwestern Finland[J]. Bulletin of the Geological Society of Finland, 1953, 160:1-64.
[46]	MIDDLEMOST E A K. Naming materials in the magma/igneous rock system[J]. Earth-Science Reviews, 1994, 37(3/4):215-224. DOI URL
[47]	DE LA ROCHE H, LETERRIER J, GRANDCLAUDE P, et al. A classification of volcanic and plutonic rocks using R₁R₂-diagram and major-element analyses—its relationships with current nomenclature[J]. Chemical Geology, 1980, 29(1/2/3/4):183-210. DOI URL
[48]	PECCERILLO A, TAYLOR S R. Geochemistry of Eocene calc-alkaline volcanic rocks from the Kastamonu area, Northern Turkey[J]. Contributions to Mineralogy and Petrology, 1976, 58(1):63-81. DOI URL
[49]	MANIAR P D, PICCOLI P M. Tectonic discrimination of granitoids[J]. Geological Society of America Bulletin, 1989, 101(5):635-643. DOI URL
[50]	郑少华, 顾雪祥, 章永梅, 等. 新疆西天山加曼特金矿床赋矿围岩年代学、地球化学及地质意义[J]. 现代地质, 2017, 31(2):209-224.
[51]	赵振华. 微量元素地球化学原理[M].2版. 北京: 科学出版社, 2016: 1-534.
[52]	SUN S S, MCDONOUGH W F. Chemical and isotopic systematics of Oceanic basalts: Implications for mantle Composition and processes[J]. Geological Society, London, Special Publications, 1989, 42(1):313-345. DOI URL
[53]	CREASER R A, PRICE R C, WORMALD R J. A-type granites revisited: Assessment of a residual-source model[J]. Geology, 1991, 19(2):163-166. DOI URL
[54]	吴福元, 李献华, 杨进辉, 等. 花岗岩成因研究的若干问题[J]. 岩石学报, 2007, 23(6):1217-1238.
[55]	徐劲驰, 顾雪祥, 王佳琳, 等. 新疆北山三峰山铜金矿区花岗岩体锆石U-Pb年代学、地球化学及其地质意义[J]. 矿物岩石地球化学通报, 2018, 37(2):294-306.
[56]	COLLINS W J, BEAMS S D, WHITE A J R, et al. Nature and origin of A-type granites with particular reference to Southeastern Australia[J]. Contributions to Mineralogy and Petrology, 1982, 80(2):189-200. DOI URL
[57]	WHALEN J B, CURRIE K L, CHAPPELL B W. A-type granites: Geochemical characteristics, discrimination and petrogenesis[J]. Contributions to Mineralogy and Petrology, 1987, 95(4):407-419. DOI URL
[58]	COLEMAN R G, PETERMAN Z E. Oceanic plagiogranite[J]. Journal of Geophysical Research, 1975, 80(8):1099-1108. DOI URL
[59]	马鸿文. 花岗岩成因类型的判别分析[J]. 岩石学报, 1992, 8(4):341-350.
[60]	张旗, 王焰, 李承东, 等. 花岗岩的Sr-Yb分类及其地质意义[J]. 岩石学报, 2006, 22(9):2249-2269.
[61]	CHAPPELL B W, WHITE A J R. Two contrasting granite types[J]. Pacific Geology, 1974, 8:173-174.
[62]	CHAPPELL B W, WHITE A J R. Two contrasting granite types: 25 years later[J]. Australian Journal of Earth Sciences, 2001, 48(4):489-499. DOI URL
[63]	CHAPPELL B W. Aluminium saturation in I- and S-type granites and the characterization of fractionated haplogranites[J]. Lithos, 1999, 46(3):535-551. DOI URL
[64]	DEFANT M J, DRUMMOND M S. Derivation of some modern arc magmas by melting of young subducted lithosphere[J]. Nature, 1990, 347:662-665. DOI URL
[65]	王焰, 张旗, 钱青. 埃达克岩(Adakite)的地球化学特征及其构造意义[J]. 地质科学, 2000, 35(2):251-256.
[66]	钱青. Adakite的地球化学特征及成因[J]. 岩石矿物学杂志, 2001, 20(3):297-306.
[67]	张旗, 王焰, 刘伟, 等. 埃达克岩的特征及其意义[J]. 地质通报, 2002, 21(7):431-435.
[68]	DRUMMOND M S, DEFANT M J. A model for Trondhjemite-Tonalite-Dacite Genesis and crustal growth via slab melting: Archean to modern comparisons[J]. Journal of Geophysical Research: Solid Earth, 1990, 95(B13):21503-21521.
[69]	王强, 许继锋, 赵振华. 一种新的火成岩——埃达克岩的研究综述[J]. 地球科学进展, 2001, 16(2):201-208.
[70]	张旗, 焦守涛. 埃达克岩来自高压背景——一个科学的、可靠的、有预见性的科学发现[J]. 岩石学报, 2020, 36(6):1675-1683.
[71]	MARTIN H. Adakitic magmas: Modern analogues of Archaean granitoids[J]. Lithos, 1999, 46(3):411-429. DOI URL
[72]	CHUNG S L, LIU D Y, JI J Q, et al. Adakites from continental collision zones: Melting of thickened lower crust beneath southern Tibet[J]. Geology, 2003, 31(11):1021-1024. DOI URL
[73]	HOU Z Q, GAO Y F, QU X M, et al. Origin of adakitic intrusives generated during mid-Miocene east-west extension in southern Tibet[J]. Earth and Planetary Science Letters, 2004, 220(1/2):139-155. DOI URL
[74]	OU Q, WANG Q, WYMAN D A, et al. Eocene adakitic porphyries in the central-northern Qiangtang Block, central Tibet: Partial melting of thickened lower crust and implications for initial surface uplifting of the plateau[J]. Journal of Geophysical Research: Solid Earth, 2017, 122(2):1025-1053. DOI URL
[75]	张旗, 王焰, 钱青, 等. 中国东部燕山期埃达克岩的特征及其构造-成矿意义[J]. 岩石学报, 2001, 17(2):236-244.
[76]	XU J F, SHINJO R, DEFANT M J, et al. Origin of Mesozoic adakitic intrusive rocks in the Ningzhen area of East China: Partial melting of delaminated lower continental crust?[J]. Geology, 2002, 30(12):1111-1114. DOI URL
[77]	GAO S, RUDNICK R L, YUAN H L, et al. Recycling lower continental crust in the North China Craton[J]. Nature, 2004, 432:892-897. DOI URL
[78]	WANG Q, XU J F, JIAN P, et al. Petrogenesis of adakitic porphyries in an extensional tectonic setting, Dexing, South China: Implications for the genesis of porphyry copper mineralization[J]. Journal of Petrology, 2006, 47(1):119-144. DOI URL
[79]	CASTILLO P R, JANNEY P E, SOLIDUM R U. Petrology and geochemistry of Camiguin island, southern Philippines: Insights to the source of adakites and other lavas in a complex arc setting[J]. Contributions to Mineralogy and Petrology, 1999, 134(1):33-51. DOI URL
[80]	张旗, 王元龙, 王焰. 燕山期中国东部高原下地壳组成初探: 埃达克质岩Sr、Nd同位素制约[J]. 岩石学报, 2001, 17(4):505-513.
[81]	王强, 赵振华, 许继峰, 等. 天山北部石炭纪埃达克岩-高镁安山岩-富Nb岛弧玄武质岩: 对中亚造山带显生宙地壳增生与铜金成矿的意义[J]. 岩石学报, 2006, 22(1):11-30.
[82]	RAPP R P, WATSON E B. Dehydration melting of metabasalt at 8-32 kbar: Implications for continental growth and crust-mantle recycling[J]. Journal of Petrology, 1995, 36(4):891-931. DOI URL
[83]	WANG Q, LI Z X, CHUNG S L, et al. Late Triassic high-Mg andesite/dacite suites from northern Hohxil, North Tibet: Geochronology, geochemical characteristics, petrogenetic processes and tectonic implications[J]. Lithos, 2011, 126(1/2):54-67. DOI URL
[84]	ALTHERR R, HOLL A, HEGNER E, et al. High-potassium, calc-alkaline I-type plutonism in the European Variscides: northern Vosges (France) and northern Schwarzwald (Germany)[J]. Lithos, 2000, 50(1/2/3) : 51-73. DOI URL
[85]	罗照华, 柯珊, 谌宏伟. 埃达克岩的特征、成因及构造意义[J]. 地质通报, 2002, 21(7):436-440.
[86]	ROLLINSON H R. Using Geochemical Data: Evolution, Presentation, Interpretation[M]. New York:Longman Group UK Ltd., 1993: 306-308.
[87]	李小伟, 莫宣学, 黄丹峰, 等. 河北兴隆王坪石正长花岗岩地球化学特征及成因研究[J]. 地质学报, 2010, 84(5):682-693.
[88]	张旗, 王焰, 熊小林. 埃达克岩和花岗岩:挑战与机遇[M]. 北京: 中国大地出版社, 2008: 1-344.
[89]	PITCHER W S. The Nature and Origin of Granite[M]. London: Blackie Academic & Professional, 1993: 1-321.
[90]	PEARCE J A, HARRIS N B W, TINDLE A G. Trace element discrimination diagrams for the tectonic interpretation of granitic rocks[J]. Journal of Petrology, 1984, 25(4):956-983. DOI URL
[91]	DONG Y P, ZHANG G W, NEUBAUER F, et al. Tectonic evolution of the Qinling orogen, China: Review and synjournal[J]. Journal of Asian Earth Sciences, 2011, 41(3):213-237. DOI URL
[92]	张国伟, 郭安林, 董云鹏, 等. 关于秦岭造山带[J]. 地质力学学报, 2019, 25(5):746-768.
[93]	MENG Q R, ZHANG G W. Geologic framework and tectonic evolution of the Qinling orogen, central China[J]. Tectonophysics, 2000, 323(3/4):183-196. DOI URL
[94]	DONG Y P, ZHANG G W, HAUZENBERGER C, et al. Palaeozoic tectonics and evolutionary history of the Qinling orogen: Evidence from geochemistry and geochronology of ophiolite and related volcanic rocks[J]. Lithos, 2011, 122(1/2):39-56. DOI URL
[95]	LI Y, YANG J S, DILEK Y, et al. Crustal architecture of the Shangdan suture zone in the Early Paleozoic Qinling orogenic belt, China: Record of subduction initiation and backarc basin development[J]. Gondwana Research, 2015, 27(2):733-744. DOI URL
[96]	裴先治, 王涛, 丁仨平, 等. 东秦岭商丹带北侧新元古代埃达克质花岗岩及其地质意义[J]. 中国地质, 2003, 30(4):372-381.
[97]	陈隽璐, 徐学义, 王洪亮, 等. 北秦岭西段早古生代埃达克岩地球化学特征及岩石成因[J]. 地质学报, 2008, 82(4):475-484.

测点	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	REE	LREE/HREE	δEu	δCe
1	0.25	40.02	0.18	1.77	2.32	1.40	15.70	4.91	59.56	23.62	122.48	28.76	329.95	73.89	704.81	0.07	0.71	46.14
2	0.34	55.03	0.42	2.63	2.96	1.14	15.28	5.09	62.72	25.06	129.18	29.60	339.96	74.17	743.57	0.09	0.52	35.31
3	1.67	32.36	0.29	2.08	1.70	0.76	10.66	3.36	40.61	17.05	89.84	21.58	248.97	56.15	527.08	0.08	0.55	11.35
4	0.50	44.88	0.40	2.87	2.32	1.08	10.81	3.17	39.64	16.70	86.70	19.34	224.73	49.33	502.49	0.12	0.66	24.69
5	3.44	87.35	2.11	13.83	7.05	2.40	26.82	8.18	92.63	37.01	176.53	38.28	403.87	84.55	984.05	0.13	0.53	7.95
7	0.38	42.78	0.17	1.50	1.51	0.81	9.78	3.29	38.81	16.18	86.65	20.21	228.70	52.24	503.03	0.10	0.64	40.92
8	0.11	48.63	0.12	1.34	2.08	1.13	11.66	3.74	47.32	18.90	96.69	22.15	249.27	54.43	557.58	0.11	0.70	102.74
11	4.81	89.56	1.43	11.96	7.29	1.94	20.85	6.43	73.80	28.72	146.08	32.42	355.47	76.65	857.41	0.16	0.48	8.38
12	3.73	38.82	0.84	4.55	2.46	1.15	14.54	4.17	50.87	20.07	106.45	23.61	272.08	61.48	604.82	0.09	0.59	5.38
13	1.37	58.99	1.21	8.23	3.54	1.53	14.72	4.13	47.89	18.49	94.86	21.86	241.53	53.72	572.07	0.15	0.65	11.23
14	56.39	153.60	11.18	43.32	7.91	1.88	17.79	5.05	60.31	24.42	129.41	29.95	333.46	76.83	951.50	0.41	0.48	1.50
16	0.51	50.25	0.26	1.76	2.44	1.10	12.97	4.16	49.23	19.96	100.17	22.80	255.35	57.18	578.14	0.11	0.60	33.51
17	0.76	49.30	0.49	3.33	2.09	1.03	12.09	3.44	41.95	16.84	87.87	20.25	232.31	52.51	524.27	0.12	0.63	19.80
18	2.59	71.98	1.17	7.78	5.98	2.14	24.21	7.03	78.50	29.84	147.71	32.02	347.74	75.31	834.00	0.12	0.54	10.11
19	0.64	50.71	0.57	3.70	2.67	1.39	12.94	3.89	48.55	18.85	99.30	22.62	249.79	54.94	570.57	0.12	0.72	20.58
20	2.95	58.94	0.88	5.25	3.39	1.26	13.64	4.26	52.29	20.90	108.69	24.76	286.08	63.84	647.14	0.13	0.57	8.95
21	12.89	84.98	4.30	22.40	9.20	2.65	24.48	6.88	79.05	30.42	153.07	34.45	382.32	81.20	928.30	0.17	0.54	2.80
22	1.99	68.91	1.85	11.51	4.96	1.85	13.77	4.23	47.49	18.62	95.38	22.21	250.12	55.29	598.19	0.18	0.69	8.81
23	0.31	54.81	0.21	1.59	2.13	1.46	13.89	4.79	60.32	24.45	129.67	29.43	337.22	74.68	734.95	0.09	0.82	52.80
25	15.16	77.19	3.87	14.58	4.94	1.40	14.02	4.49	58.42	23.87	128.29	30.89	361.23	83.03	821.36	0.17	0.51	2.47
26	11.26	86.06	3.48	15.11	4.87	1.51	16.06	5.10	58.47	22.86	114.08	26.12	284.26	61.84	711.08	0.21	0.52	3.37
27	18.40	88.61	3.70	14.97	4.93	1.22	14.48	4.38	55.21	21.45	111.10	25.11	282.44	62.45	708.45	0.23	0.44	2.63
28	0.38	40.44	0.16	1.04	1.59	0.87	10.93	3.32	42.52	18.14	98.63	23.04	267.71	61.51	570.30	0.08	0.64	40.25
29	2.12	85.95	0.70	4.60	5.60	1.68	22.16	7.64	93.76	37.88	198.05	43.07	475.73	103.57	1 082.51	0.10	0.46	17.32

测点	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	REE	LREE/HREE	δEu	δCe
1	0.25	40.02	0.18	1.77	2.32	1.40	15.70	4.91	59.56	23.62	122.48	28.76	329.95	73.89	704.81	0.07	0.71	46.14
2	0.34	55.03	0.42	2.63	2.96	1.14	15.28	5.09	62.72	25.06	129.18	29.60	339.96	74.17	743.57	0.09	0.52	35.31
3	1.67	32.36	0.29	2.08	1.70	0.76	10.66	3.36	40.61	17.05	89.84	21.58	248.97	56.15	527.08	0.08	0.55	11.35
4	0.50	44.88	0.40	2.87	2.32	1.08	10.81	3.17	39.64	16.70	86.70	19.34	224.73	49.33	502.49	0.12	0.66	24.69
5	3.44	87.35	2.11	13.83	7.05	2.40	26.82	8.18	92.63	37.01	176.53	38.28	403.87	84.55	984.05	0.13	0.53	7.95
7	0.38	42.78	0.17	1.50	1.51	0.81	9.78	3.29	38.81	16.18	86.65	20.21	228.70	52.24	503.03	0.10	0.64	40.92
8	0.11	48.63	0.12	1.34	2.08	1.13	11.66	3.74	47.32	18.90	96.69	22.15	249.27	54.43	557.58	0.11	0.70	102.74
11	4.81	89.56	1.43	11.96	7.29	1.94	20.85	6.43	73.80	28.72	146.08	32.42	355.47	76.65	857.41	0.16	0.48	8.38
12	3.73	38.82	0.84	4.55	2.46	1.15	14.54	4.17	50.87	20.07	106.45	23.61	272.08	61.48	604.82	0.09	0.59	5.38
13	1.37	58.99	1.21	8.23	3.54	1.53	14.72	4.13	47.89	18.49	94.86	21.86	241.53	53.72	572.07	0.15	0.65	11.23
14	56.39	153.60	11.18	43.32	7.91	1.88	17.79	5.05	60.31	24.42	129.41	29.95	333.46	76.83	951.50	0.41	0.48	1.50
16	0.51	50.25	0.26	1.76	2.44	1.10	12.97	4.16	49.23	19.96	100.17	22.80	255.35	57.18	578.14	0.11	0.60	33.51
17	0.76	49.30	0.49	3.33	2.09	1.03	12.09	3.44	41.95	16.84	87.87	20.25	232.31	52.51	524.27	0.12	0.63	19.80
18	2.59	71.98	1.17	7.78	5.98	2.14	24.21	7.03	78.50	29.84	147.71	32.02	347.74	75.31	834.00	0.12	0.54	10.11
19	0.64	50.71	0.57	3.70	2.67	1.39	12.94	3.89	48.55	18.85	99.30	22.62	249.79	54.94	570.57	0.12	0.72	20.58
20	2.95	58.94	0.88	5.25	3.39	1.26	13.64	4.26	52.29	20.90	108.69	24.76	286.08	63.84	647.14	0.13	0.57	8.95
21	12.89	84.98	4.30	22.40	9.20	2.65	24.48	6.88	79.05	30.42	153.07	34.45	382.32	81.20	928.30	0.17	0.54	2.80
22	1.99	68.91	1.85	11.51	4.96	1.85	13.77	4.23	47.49	18.62	95.38	22.21	250.12	55.29	598.19	0.18	0.69	8.81
23	0.31	54.81	0.21	1.59	2.13	1.46	13.89	4.79	60.32	24.45	129.67	29.43	337.22	74.68	734.95	0.09	0.82	52.80
25	15.16	77.19	3.87	14.58	4.94	1.40	14.02	4.49	58.42	23.87	128.29	30.89	361.23	83.03	821.36	0.17	0.51	2.47
26	11.26	86.06	3.48	15.11	4.87	1.51	16.06	5.10	58.47	22.86	114.08	26.12	284.26	61.84	711.08	0.21	0.52	3.37
27	18.40	88.61	3.70	14.97	4.93	1.22	14.48	4.38	55.21	21.45	111.10	25.11	282.44	62.45	708.45	0.23	0.44	2.63
28	0.38	40.44	0.16	1.04	1.59	0.87	10.93	3.32	42.52	18.14	98.63	23.04	267.71	61.51	570.30	0.08	0.64	40.25
29	2.12	85.95	0.70	4.60	5.60	1.68	22.16	7.64	93.76	37.88	198.05	43.07	475.73	103.57	1 082.51	0.10	0.46	17.32

测点	含量/10^-6		Th/U	同位素原子比						同位素年龄/Ma						谐和度/%
测点	Th	U	Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	谐和度/%
1	633	1 120	0.57	0.054 49	0.001 77	0.525 50	0.017 21	0.069 70	0.000 70	391	72	429	11	434	4	98
2	644	1 271	0.51	0.055 62	0.001 62	0.535 66	0.015 11	0.069 69	0.000 69	439	65	436	10	434	4	99
3	354	771	0.46	0.056 10	0.001 60	0.541 22	0.016 35	0.069 63	0.000 79	457	63	439	11	434	5	98
4	690	1 249	0.55	0.057 31	0.001 61	0.553 15	0.015 50	0.069 71	0.000 59	502	63	447	10	434	4	97
5	946	1 421	0.67	0.054 35	0.001 43	0.523 35	0.013 78	0.069 66	0.000 91	387	59	427	9	434	5	98
7	667	1 126	0.59	0.058 20	0.001 81	0.562 40	0.017 46	0.069 79	0.000 71	539	64	453	11	435	4	95
8	917	1 506	0.61	0.056 05	0.001 75	0.539 58	0.015 93	0.069 61	0.000 61	454	69	438	11	434	4	98
11	1 427	2 105	0.68	0.059 62	0.001 56	0.574 29	0.014 96	0.069 67	0.000 58	591	62	461	10	434	4	94
12	428	862	0.50	0.056 91	0.001 62	0.547 28	0.015 10	0.069 71	0.000 63	487	58	443	10	434	4	97
13	1 146	1 810	0.63	0.058 71	0.001 48	0.566 41	0.015 44	0.069 73	0.000 64	567	54	456	10	435	4	95
14	655	1 168	0.56	0.059 79	0.001 90	0.572 34	0.017 50	0.069 55	0.000 77	594	70	460	11	433	5	94
16	764	1 396	0.55	0.058 40	0.001 95	0.560 49	0.018 85	0.069 61	0.000 68	546	69	452	12	434	4	95
17	869	1 495	0.58	0.059 31	0.001 97	0.569 80	0.019 01	0.069 77	0.000 69	589	72	458	12	435	4	94
18	1 001	1 241	0.81	0.058 52	0.001 67	0.560 32	0.015 25	0.069 62	0.000 73	550	61	452	10	434	4	95
19	922	1 452	0.63	0.059 27	0.001 70	0.570 32	0.016 62	0.069 76	0.000 57	576	58	458	11	435	3	94
20	955	1 549	0.62	0.060 51	0.001 53	0.580 29	0.014 70	0.069 58	0.000 65	620	56	465	9	434	4	93
21	975	1 338	0.73	0.062 06	0.003 56	0.601 44	0.037 87	0.069 84	0.000 78	676	122	478	24	435	5	90
22	1 025	1 543	0.66	0.059 37	0.001 62	0.570 49	0.015 46	0.069 66	0.000 61	589	59	458	10	434	4	94
23	663	1 297	0.51	0.058 57	0.001 71	0.563 59	0.016 86	0.069 71	0.000 67	550	63	454	11	434	4	95
25	615	1 337	0.46	0.061 34	0.003 32	0.592 66	0.034 57	0.069 65	0.000 82	650	117	473	22	434	5	91
26	822	1 369	0.60	0.055 77	0.001 69	0.535 89	0.015 88	0.069 64	0.000 64	443	67	436	10	434	4	99
27	718	1 193	0.60	0.056 57	0.001 47	0.544 50	0.014 13	0.069 70	0.000 69	476	57	441	9	434	4	98
28	585	1 163	0.50	0.056 04	0.001 65	0.539 86	0.015 55	0.069 77	0.000 64	454	65	438	10	435	4	99
29	1 109	1 770	0.63	0.059 32	0.001 69	0.568 72	0.019 00	0.069 19	0.000 91	589	61	457	12	431	5	94

测点	含量/10^-6		Th/U	同位素原子比						同位素年龄/Ma						谐和度/%
测点	Th	U	Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	谐和度/%
1	633	1 120	0.57	0.054 49	0.001 77	0.525 50	0.017 21	0.069 70	0.000 70	391	72	429	11	434	4	98
2	644	1 271	0.51	0.055 62	0.001 62	0.535 66	0.015 11	0.069 69	0.000 69	439	65	436	10	434	4	99
3	354	771	0.46	0.056 10	0.001 60	0.541 22	0.016 35	0.069 63	0.000 79	457	63	439	11	434	5	98
4	690	1 249	0.55	0.057 31	0.001 61	0.553 15	0.015 50	0.069 71	0.000 59	502	63	447	10	434	4	97
5	946	1 421	0.67	0.054 35	0.001 43	0.523 35	0.013 78	0.069 66	0.000 91	387	59	427	9	434	5	98
7	667	1 126	0.59	0.058 20	0.001 81	0.562 40	0.017 46	0.069 79	0.000 71	539	64	453	11	435	4	95
8	917	1 506	0.61	0.056 05	0.001 75	0.539 58	0.015 93	0.069 61	0.000 61	454	69	438	11	434	4	98
11	1 427	2 105	0.68	0.059 62	0.001 56	0.574 29	0.014 96	0.069 67	0.000 58	591	62	461	10	434	4	94
12	428	862	0.50	0.056 91	0.001 62	0.547 28	0.015 10	0.069 71	0.000 63	487	58	443	10	434	4	97
13	1 146	1 810	0.63	0.058 71	0.001 48	0.566 41	0.015 44	0.069 73	0.000 64	567	54	456	10	435	4	95
14	655	1 168	0.56	0.059 79	0.001 90	0.572 34	0.017 50	0.069 55	0.000 77	594	70	460	11	433	5	94
16	764	1 396	0.55	0.058 40	0.001 95	0.560 49	0.018 85	0.069 61	0.000 68	546	69	452	12	434	4	95
17	869	1 495	0.58	0.059 31	0.001 97	0.569 80	0.019 01	0.069 77	0.000 69	589	72	458	12	435	4	94
18	1 001	1 241	0.81	0.058 52	0.001 67	0.560 32	0.015 25	0.069 62	0.000 73	550	61	452	10	434	4	95
19	922	1 452	0.63	0.059 27	0.001 70	0.570 32	0.016 62	0.069 76	0.000 57	576	58	458	11	435	3	94
20	955	1 549	0.62	0.060 51	0.001 53	0.580 29	0.014 70	0.069 58	0.000 65	620	56	465	9	434	4	93
21	975	1 338	0.73	0.062 06	0.003 56	0.601 44	0.037 87	0.069 84	0.000 78	676	122	478	24	435	5	90
22	1 025	1 543	0.66	0.059 37	0.001 62	0.570 49	0.015 46	0.069 66	0.000 61	589	59	458	10	434	4	94
23	663	1 297	0.51	0.058 57	0.001 71	0.563 59	0.016 86	0.069 71	0.000 67	550	63	454	11	434	4	95
25	615	1 337	0.46	0.061 34	0.003 32	0.592 66	0.034 57	0.069 65	0.000 82	650	117	473	22	434	5	91
26	822	1 369	0.60	0.055 77	0.001 69	0.535 89	0.015 88	0.069 64	0.000 64	443	67	436	10	434	4	99
27	718	1 193	0.60	0.056 57	0.001 47	0.544 50	0.014 13	0.069 70	0.000 69	476	57	441	9	434	4	98
28	585	1 163	0.50	0.056 04	0.001 65	0.539 86	0.015 55	0.069 77	0.000 64	454	65	438	10	435	4	99
29	1 109	1 770	0.63	0.059 32	0.001 69	0.568 72	0.019 00	0.069 19	0.000 91	589	61	457	12	431	5	94

样品编号	SiO₂	TiO₂	Al₂O₃	Fe₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O
NEG-1	69.52	0.32	15.00	2.73	1.42	0.06	1.14	2.72	4.79	3.13
NEG-2	69.53	0.32	14.87	2.74	1.48	0.06	1.12	2.70	4.74	3.07
NEG-3	69.17	0.32	15.08	2.94	1.64	0.07	1.19	2.72	4.71	3.10
NEG-4	68.79	0.33	14.92	2.88	1.55	0.06	1.25	2.82	4.76	3.06
NEG-5	69.01	0.32	14.97	3.00	1.61	0.07	1.15	2.70	4.74	3.10
样品编号	P₂O₅	烧失量	总量	AR	σ	A/NK	A/CNK	K₂O+Na₂O	Na₂O/K₂O	DF
NEG-1	0.15	0.26	101.24	2.62	2.37	1.33	0.93	7.92	1.53	3.52
NEG-2	0.15	0.40	101.18	2.60	2.30	1.34	0.93	7.81	1.54	3.40
NEG-3	0.16	0.40	101.50	2.56	2.33	1.36	0.94	7.81	1.52	3.27
NEG-4	0.16	0.30	100.88	2.58	2.37	1.34	0.93	7.82	1.56	3.45
NEG-5	0.15	0.30	101.12	2.60	2.36	1.34	0.93	7.84	1.53	3.37
样品编号	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho
NEG-1	27.7	52.6	5.74	18.0	2.89	1.04	2.56	0.30	1.45	0.24
NEG-2	27.0	54.1	5.42	17.6	2.94	1.08	2.46	0.28	1.40	0.23
NEG-3	25.3	52.1	5.91	19.1	3.10	1.14	2.55	0.29	1.36	0.22
NEG-4	30.1	56.6	6.12	20.3	3.31	1.16	2.81	0.33	1.52	0.25
NEG-5	28.9	53.8	5.63	17.7	2.93	1.08	2.52	0.29	1.36	0.23
样品编号	Er	Tm	Yb	Lu	Y	REE	LREE	HREE	LREE/HREE	δEu
NEG-1	0.72	0.09	0.66	0.10	7.03	114.09	107.97	6.12	17.64	1.17
NEG-2	0.63	0.09	0.60	0.11	6.91	113.94	108.14	5.80	18.64	1.23
NEG-3	0.62	0.08	0.56	0.11	6.43	112.44	106.65	5.79	18.42	1.24
NEG-4	0.71	0.10	0.66	0.12	7.69	124.09	117.59	6.50	18.09	1.16
NEG-5	0.67	0.09	0.59	0.11	6.83	115.90	110.04	5.86	18.78	1.22
样品编号	δCe	(La/Yb)_N	Li	Be	Sc	V	Cr	Co	Ni	Cu
NEG-1	1.02	30.10	14.4	1.83	4.53	56.5	25.7	5.54	10.8	8.84
NEG-2	1.10	32.28	17.1	2.02	4.38	58.6	25.2	5.63	11.0	8.99
NEG-3	1.04	32.41	18.5	1.70	4.89	74.7	31.8	6.60	15.5	8.38
NEG-4	1.02	32.71	16.6	2.01	4.71	61.9	29.6	5.97	12.3	4.67
NEG-5	1.03	35.14	15.4	1.87	4.48	68.7	23.1	6.15	12.7	7.38
样品编号	Zn	Ga	Rb	Sr	Mo	Cd	In	Cs	Ba	W
NEG-1	40.1	16.7	105	606	1.93	0.04	0.02	2.42	1 041	0.56
NEG-2	37.7	16.8	103	619	1.50	0.03	0.02	2.37	1 028	0.48
NEG-3	44.7	17.8	107	664	4.62	0.03	0.02	2.40	1 045	7.86
NEG-4	39.5	16.0	100	613	1.79	0.03	0.02	2.58	959	0.46
NEG-5	43.4	16.9	104	630	2.71	0.03	0.02	2.60	979	1.25
样品编号	Tl	Pb	Bi	Th	U	Sb	Nb	Ta	Zr	Hf
NEG-1	0.65	22.9	0.110	16.2	1.96	0.16	9.44	0.92	121	3.68
NEG-2	0.65	23.8	0.094	14.5	2.07	0.20	8.82	0.96	105	4.02
NEG-3	0.72	23.9	0.140	15.6	2.23	0.21	10.10	0.93	111	3.57
NEG-4	0.64	23.4	0.110	16.8	2.34	0.86	10.90	0.68	125	4.37
NEG-5	0.70	20.4	0.130	15.7	1.92	0.25	9.36	0.60	105	3.75