喀拉昆仑火烧云一带早侏罗世双峰式火山岩的发现及意义

doi:10.19657/j.geoscience.1000-8527.2019.05.06

摘要/Abstract

摘要：

喀拉昆仑火烧云北火山岩发育在乔尔天山断裂附近,玄武岩体和安山岩体在时空上紧密伴生。主量元素测试结果显示,其中玄武岩和英安岩的SiO₂含量分别为48.84%~52.44%和62.22%~65.63%,具有明显的Daly间断面,属于典型的双峰式火山岩。玄武岩Al₂O₃含量较低, MgO、CaO、TiO₂含量较高,Sr、Ba、K等微量元素强烈亏损,高场强元素Ta、Nb、Ti、Zr无亏损。英安岩具有相对较高的Al₂O₃、Na₂O、K₂O含量,较低的MgO、CaO、TiO₂含量;微量元素具富集大离子亲石元素(Rb、Th、U、K)、亏损高场强元素(Ta、Nb、Ti),显示典型岛弧环境特征。岩石地球化学特征表明二者同属钙碱系列,形成于弧后盆地,属同源演化,英安岩为玄武岩结晶分异的产物。通过对英安岩进行LA-ICP-MS锆石U-Pb方法测年,获得流纹岩形成年龄为(195.5±1.1) Ma,属于早侏罗世。通过对该区域构造演化进行分析讨论,认为乔尔天山一带盆地整体可能处于弧后盆地的发育阶段,盆地形成过程中岩石圈地幔未被拉断,没有洋壳形成。

关键词: 喀拉昆仑火烧云, 双峰式火山岩, 玄武质岩石, 英安岩

Abstract:

The Karakoram volcanic rocks are close to the Qiao’er Tianshan Fault, and the two are closely space-time related. The SiO₂ contents of the basalt and dacite are of 48.84%-52.44% and 62.22%-65.63%, respectively. They have obvious Daly intercepts and are typically bimodal. Basalt has a low content of Al₂O₃, and high contents of MgO, CaO, TiO₂. Some trace elements (Sr, Ba) are strongly depleted, whereas the high field strength elements (HFSEs, e.g.Ta, Nb, Ti, Zr) are not depleted. Dacite has relatively high Al₂O₃, Na₂O and K₂O contents, but low MgO, CaO and TiO₂ contents, and are enriched in large ion lithophile elements (LILEs, e.g.Rb, Th, U, K), depleted of HFSEs, showing typical island arc geochemical affinity. Both the basalt and dacite are calc-alkaline, co-magmatic and likely formed in back-arc basins. Dacite may have formed from the fractionation of basaltic magma. LA-ICP-MS zircon U-Pb dating of the dacite yielded Early Jurassic age of (195.5±1.1) Ma. Considering the regional tectonic evolution, it is concluded that the Qiao’er Tianshan area may have been a developing backarc basin. We suggest that the lithospheric mantle of the basin during the volcanism had not been broken off and no oceanic crust was formed.

Key words: Karakoram, bimodal volcanism, basaltic rock, dacite

中图分类号:

P588.14
P597

周能武, 陈邦学, 邓中飞, 桑明帅, 白权金. 喀拉昆仑火烧云一带早侏罗世双峰式火山岩的发现及意义[J]. 现代地质, 2019, 33(05): 990-1002.

ZHOU Nengwu, CHEN Bangxue, DENG Zhongfei, SANG Mingshuai, BAI Quanjin. Discovery and Significance of Early Jurassic Bimodal Volcanic Rocks in Huoshaoyun, Karakoram[J]. Geoscience, 2019, 33(05): 990-1002.

图/表 13

参考文献 51

[1]	任纪舜, 王作勋, 陈炳蔚. 从全球看中国大地构造:中国及邻区大地构造图简要说明[M]. 北京: 地质出版社, 1999.
[2]	姜春发. 中央造山带开合构造[M]. 北京: 地质出版社, 2000.
[3]	赵佳楠, 刘正军. 新疆西昆仑造山带北缘中元古代帕什托克闪长岩侵入序列及其地质意义[J]. 中国地质, 2014,41(1):92-107.
[4]	李荣社. 昆仑山及邻区地质[M]. 北京: 地质出版社, 2008.
[5]	MATTE P, TAPPONNIER P, ARNAUD N, et al. Tectonics of Western Tibet, between the Tarim and the Indus[J]. Earth and Planetary Science Letters, 1996,142(3):311-330. DOI URL
[6]	MATTERN F, SCHNEIDER W. Suturing of the Proto-and Paleo-Tethys oceans in the western Kunlun (Xinjiang, China)[J]. Journal of Asian Earth Sciences, 2000,18(6):637-650. DOI URL
[7]	肖文交. 西昆仑大地构造相解剖及其多岛增生过程[J]. 中国科学(D辑), 2000,30(12):22-28.
[8]	WANG Zongqi, JIANG Chunfa, YAN Quanren, et al. Accretion and collision orogeneses in the West Kunlun Mountains, China[J]. Gondwana Research, 2001,4(4):843-844.
[9]	XIAO Wenjiao, WINDLEY B F, FANG A M, et al. Palaeozoic-Early Mesozoic accretionary tectonics of the western Kunlun range, NW China[J]. Gondwana Research, 2001,4(4):826-827. DOI URL
[10]	XIAO Wenjiao, WINDLEY B, HAO Jie, et al. Arc-ophiolite obduction in the western Kunlun range (China): implications for the Palaeozoic evolution of central Asia[J]. Journal of the Geological Society, 2002,159(5):517-528. DOI URL
[11]	袁超, 孙敏, 肖文交, 等. 原特提斯的消减极性: 西昆仑128公里岩体的启示[J]. 岩石学报, 2004,19(3):399-408.
[12]	计文化. 西昆仑—喀喇昆仑晚古生代—早中生代构造格局 [D]. 北京:中国地质大学(北京), 2005.
[13]	韩芳林. 西昆仑增生造山带演化及成矿背景[D]. 北京: 中国地质大学(北京), 2006.
[14]	张传林, 陆松年, 于海锋, 等. 青藏高原北缘西昆仑造山带构造演化: 来自锆石SHRIMP及LA-ICP-MS 测年的证据[J]. 中国科学(地球科学), 2007,37(2):145-154.
[15]	高晓峰, 校培喜, 康磊, 等. 西昆仑大同西岩体成因: 矿物学、地球化学和锆石U-Pb年代学制约[J]. 岩石学报, 2013,29(9):3065-3079.
[16]	康磊, 校培喜, 高晓峰, 等. 西昆仑康西瓦断裂西段斜长片麻岩LA-ICP-MS锆石U-Pb定年及其构造意义[J]. 地质通报, 2012,31(8):1244-1250.
[17]	康磊, 校培喜, 高晓峰, 等. 西昆仑西段晚古生代—中生代花岗质岩浆作用及构造演化过程[J]. 中国地质, 2015,42(3):533-552.
[18]	董连慧, 徐兴旺, 范廷宾, 等. 喀喇昆仑火烧云超大型喷流-沉积成因碳酸盐型Pb-Zn矿的发现及区域成矿学意义[J]. 新疆地质, 2015,33(1):41-50.
[19]	杜红星, 魏永峰, 薛春纪, 等. 多宝山铅锌矿床地质特征及地球化学研究[J]. 新疆地质, 2012,30(1):52-57.
[20]	杜红星, 魏永峰, 薛春纪, 等. 和田宝塔山铅锌矿地质特征与流体包裹体研究[J]. 新疆地质, 2013,31(1):16-20.
[21]	魏永峰, 赵志强, 林美英, 等. 西昆仑团结峰地区E-MORB残片的发现、地球化学特征及构造意义[J]. 新疆地质, 2016,34(3):312-316.
[22]	周能武, 陈邦学, 朱彦菲, 等. 西昆仑岔路口西花岗岩地球化学特征及构造意义[J]. 新疆地质, 2016,34(4):437-445.
[23]	ANDERSEN T. Correction of common lead in U-Pb analyses that do not report ²⁰⁴Pb[J]. Chemical Geology, 2002,192(1):59-79. DOI URL
[24]	王岚, 杨理勤, 王亚平, 等. 锆石LA-ICP-MS原位微区U-Pb定年及微量元素的同时测定[J]. 地球学报, 2012,33(5):763-772.
[25]	WILLIAMS I S. U-Th-Pb geochronology by ion microprobe[J]. Reviews in Economic Geology, 1998,7(1):1-35.
[26]	LUDWIG K R. Using Isoplot/EX,Version2,A Geochronological Toolkit for Microsoft Excel[M]. Berkeley:Berkeley Geochronological Center Special Publication, 1999:151-181.
[27]	宋彪, 张玉海, 万渝生, 等. 锆石SHRIMP样品靶制作、年龄测定及有关现象讨论[J]. 地质论评, 2002,48(1):26-30.
[28]	吴元保, 郑永飞. 锆石成因矿物学研究及其对U-Pb年龄解释的制约[J]. 科学通报, 2004,49(16):1589-1604.
[29]	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.
[30]	BAS M J L, MAITRE R W L, STRECKEISEN A, et al. A chemical classification of volcanic rocks based on the total alkali-silica diagram[J]. Journal of Petrology, 1986,27(3):745-750. DOI URL
[31]	WINCHESTER J A, FLOYD P A. Geochemical discrimination of different magma series and their differentiation products using immobile elements[J]. Chemical Geology, 1977,20(4):325-343. DOI URL
[32]	RICKWOOD P C. Boundary lines within petrologic diagrams which use oxides of major and minor elements[J]. Lithos, 1989,22(4):247-263. DOI URL
[33]	MIYASHIRO A. Volcanic rock series in island arcs and active continental margins[J]. American Journal of Science, 1974,274(4):321-355. DOI URL
[34]	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
[35]	GROVE T L, DONNELLYNOLAN J M. The evolution of young silicic lavas at Medicine Lake Volcano, California: Implications for the origin of compositional gaps in calc-alkaline series lavas[J]. Contributions to Mineralogy and Petrology, 1986,92(3):281-302. DOI URL
[36]	MACDONALD R. Quaternary peralkaline silicic rocks and caldera volcanoes of Kenya[J]. Geological Society,London,Special Publications, 1987,30(1):313-333. DOI URL
[37]	赵乐强, 秦峰, 贾凡建, 等. 准噶尔盆地南缘晚古生代双峰式火山岩成因机制及其地球动力学背景[J]. 岩石矿物学杂志, 2017,36(2):148-162.
[38]	SHINJO R, KATO Y. Geochemical constraints on the origin of bimodal magmatism at the Okinawa Trough, an incipient back-arc basin[J]. Lithos, 2000,54(3/4):117-137. DOI URL
[39]	BROPHY J G. Composition gaps, critical crystallinity, and fractional crystallization in orogenic (calc-alkaline) magmatic systems[J]. Contributions to Mineralogy and Petrology, 1991,109(2):173-182. DOI URL
[40]	HOCHSTAEDTER A G, GILL J B, KUSAKABE M, et al. Volcanism in the Sumisu Rift, I. Major element, volatile, and stable isotope geochemistry[J]. Earth and Planetary Science Letters, 1990,100(1/3):179-194. DOI URL
[41]	GEIST D, HOWARD K A, LARSON P. The generation of Ocea-nic rhyolites by crystal fractionation: the basalt-rhyolite association at Volcán Alcedo, Galápagos Archipelago[J]. Journal of Petrology, 1995,36(4):965-982. DOI URL
[42]	DOE B R, LEEMAN W P, CHRISTIANSEN R L, et al. Lead and strontium isotopes and related trace elements as genetic tracers in the Upper Cenozoic rhyolite-basalt association of the Yellowstone Plateau volcanic field[J]. Journal of Geophysical Research (Solid Earth), 1982,87(6):4785-4806.
[43]	DAVIES G R, MACDONALD R. Crustal influences in the petrogenesis of the Naivasha basalt—comendite complex: combined trace element and Sr-Nd-Pb isotope constraints[J]. Journal of Petrology, 1987,28(6):1009-1031. DOI URL
[44]	BUERGER M J. The interpretation of Harker syntheses[J]. Journal of Applied Physics, 1946,17(7):579-595. DOI URL
[45]	BROUXEL M, LAPIERRE H, MICHARD A, et al. The deep layers of a Paleozoic arc: geochemistry of the Copley-Balaklala series, northern California[J]. Earth & Planetary Science Letters, 1987,85(4):386-400.
[46]	HALL A. Igneous petrogenesis: A global tectonic approach[J]. Mineralogical Magazine, 1989,53:514-515. DOI URL
[47]	PEARCE J A, MEI H. Volcanic rocks of the 1985 Tibet geotraverse: Lhasa to Golmud[J]. Philosophical Transactions of the Royal Society of London, 1988,327:169-201.
[48]	JOLLY W T, LIDIAK E G, DICKIN A P. Bimodal volcanism in northeast Puerto Rico and the Virgin Islands (Greater Antilles Island Arc): Genetic links with Cretaceous subduction of the mid-Atlantic ridge Caribbean spur[J]. Lithos, 2008,103(3):393-414. DOI URL
[49]	MESCHEDE M. A method of discriminating between different types of mid-ocean ridge basalts and continental tholeiites with the Nb-Zr-Y diagram[J]. Chemical Geology, 1986,56(3):207-218. DOI URL
[50]	PEARCE J A, CANN J R. Tectonic setting of basic volcanic rocks determined using trace element analyses[J]. Earth and Planetary Science Letters, 1973,19(2):290-300. DOI URL
[51]	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

测试点	含量/10^-6			同位素比值								年龄/Ma
测试点	Th	U		²³²Th/ ²³⁸U	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ		²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ
1	357	964	0.369 9		0.067 8	0.011 3	0.220 6	0.004 1	0.030 8	0.000 6	861		349	202	3	195	4
2	555	1 066	0.520 0		0.053 1	0.000 9	0.278 4	0.004 9	0.037 9	0.000 3	345		41	249	4	240	2
3	354	812	0.435 5		0.053 7	0.000 9	0.280 5	0.005 0	0.037 9	0.000 4	367		37	251	4	240	3
4	310	878	0.353 2		0.049 4	0.000 8	0.209 1	0.003 9	0.030 6	0.000 4	169		41	193	3	195	2
5	201	661	0.303 2		0.053 0	0.001 2	0.277 3	0.006 6	0.037 9	0.000 3	332		56	249	5	239	2
6	368	968	0.380 0		0.049 4	0.000 9	0.210 8	0.003 4	0.030 9	0.000 3	169		41	194	3	196	2
7	236	623	0.378 3		0.050 4	0.001 1	0.264 5	0.006 4	0.038 0	0.000 4	213		48	238	5	240	3
8	358	763	0.469 3		0.054 3	0.000 9	0.231 6	0.003 8	0.031 0	0.000 3	383		37	212	3	197	2
9	370	798	0.463 3		0.048 8	0.000 9	0.207 1	0.004 6	0.030 7	0.000 4	200		44	191	4	195	2
10	487	1 128	0.432 2		0.055 1	0.000 9	0.233 6	0.003 6	0.030 9	0.000 4	417		35	213	3	196	3
11	219	655	0.3347		0.049 8	0.001 2	0.208 3	0.005 3	0.030 9	0.000 4	183		59	192	4	196	2
12	267	713	0.374 4		0.049 7	0.001 0	0.259 8	0.005 1	0.037 9	0.000 3	189		51	235	4	240	2
13	363	805	0.451 0		0.052 7	0.001 1	0.275 3	0.005 4	0.037 9	0.000 4	322		14	247	4	240	3
14	343	946	0.362 6		0.052 9	0.001 1	0.223 9	0.004 5	0.030 9	0.000 5	324		50	205	4	196	3
15	391	845	0.462 3		0.060 5	0.002 2	0.288 6	0.010 4	0.034 4	0.000 6	633		78	257	8	218	3
16	297	838	0.354 2		0.050 6	0.000 9	0.215 6	0.004 3	0.030 8	0.000 4	220		36	198	4	196	2
17	332	849	0.391 2		0.049 4	0.001 2	0.258 9	0.005 4	0.038 0	0.000 3	169		56	234	4	240	2
18	842	1 101	0.765 3		0.087 9	0.002 6	0	0	0	0	1 381		58	0	0	0	0
19	416	1 046	0.398 0		0.068 5	0.010 4	0.244 6	0.003 6	0.030 8	0.000 4	883		319	222	3	196	3
20	426	1 208	0.352 7		0.054 6	0.000 7	0.231 4	0.003 7	0.030 7	0.000 3	398		31	211	3	195	2
21	252	819	0.308 0		0.051 1	0.001 2	0.216 3	0.005 2	0.030 7	0.000 3	256		54	199	4	195	2
22	265	813	0.326 1		0.049 7	0.000 9	0.212 3	0.004 1	0.030 9	0.000 2	189		41	196	3	196	2
23	343	981	0.350 1		0.055 4	0.000 9	0.233 4	0.003 7	0.030 7	0.000 4	428		35	213	3	195	2
24	334	964	0.346 3		0.050 3	0.000 9	0.213 3	0.004 2	0.030 7	0.000 4	209		41	196	3	195	2
25	352	945	0.372 9		0.055 3	0.001 0	0.237 4	0.003 6	0.030 9	0.000 5	433		41	216	3	196	3
26	281	870	0.323 3		0.051 1	0.000 9	0.217 6	0.003 9	0.030 9	0.000 4	256		38	200	3	196	2
27	267	826	0.323 3		0.052 9	0.000 8	0.223 8	0.004 0	0.030 7	0.000 4	324		40	205	3	195	3
28	376	965	0.389 7		0.056 5	0.002 0	0.291 3	0.020 2	0.037 8	0.001 2	472		78	260	16	239	7
29	275	823	0.334 6		0.078 0	0.023 8	0.485 1	0.190 8	0.038 2	0.001 3	1 147		634	402	131	241	8
30	270	820	0.329 4		0.050 2	0.001 2	0.211 7	0.005 1	0.030 6	0.000 4	211		56	195	4	194	2
31	417	1 140	0.365 6		0.049 9	0.000 9	0.211 3	0.004 7	0.030 6	0.000 4	191		43	195	4	194	3
32	541	947	0.571 5		0.060 8	0.001 0	0.582 5	0.262 7	0.036 5	0.001 6	632		33	466	170	231	10

测试点	含量/10^-6			同位素比值								年龄/Ma
测试点	Th	U		²³²Th/ ²³⁸U	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ		²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ
1	357	964	0.369 9		0.067 8	0.011 3	0.220 6	0.004 1	0.030 8	0.000 6	861		349	202	3	195	4
2	555	1 066	0.520 0		0.053 1	0.000 9	0.278 4	0.004 9	0.037 9	0.000 3	345		41	249	4	240	2
3	354	812	0.435 5		0.053 7	0.000 9	0.280 5	0.005 0	0.037 9	0.000 4	367		37	251	4	240	3
4	310	878	0.353 2		0.049 4	0.000 8	0.209 1	0.003 9	0.030 6	0.000 4	169		41	193	3	195	2
5	201	661	0.303 2		0.053 0	0.001 2	0.277 3	0.006 6	0.037 9	0.000 3	332		56	249	5	239	2
6	368	968	0.380 0		0.049 4	0.000 9	0.210 8	0.003 4	0.030 9	0.000 3	169		41	194	3	196	2
7	236	623	0.378 3		0.050 4	0.001 1	0.264 5	0.006 4	0.038 0	0.000 4	213		48	238	5	240	3
8	358	763	0.469 3		0.054 3	0.000 9	0.231 6	0.003 8	0.031 0	0.000 3	383		37	212	3	197	2
9	370	798	0.463 3		0.048 8	0.000 9	0.207 1	0.004 6	0.030 7	0.000 4	200		44	191	4	195	2
10	487	1 128	0.432 2		0.055 1	0.000 9	0.233 6	0.003 6	0.030 9	0.000 4	417		35	213	3	196	3
11	219	655	0.3347		0.049 8	0.001 2	0.208 3	0.005 3	0.030 9	0.000 4	183		59	192	4	196	2
12	267	713	0.374 4		0.049 7	0.001 0	0.259 8	0.005 1	0.037 9	0.000 3	189		51	235	4	240	2
13	363	805	0.451 0		0.052 7	0.001 1	0.275 3	0.005 4	0.037 9	0.000 4	322		14	247	4	240	3
14	343	946	0.362 6		0.052 9	0.001 1	0.223 9	0.004 5	0.030 9	0.000 5	324		50	205	4	196	3
15	391	845	0.462 3		0.060 5	0.002 2	0.288 6	0.010 4	0.034 4	0.000 6	633		78	257	8	218	3
16	297	838	0.354 2		0.050 6	0.000 9	0.215 6	0.004 3	0.030 8	0.000 4	220		36	198	4	196	2
17	332	849	0.391 2		0.049 4	0.001 2	0.258 9	0.005 4	0.038 0	0.000 3	169		56	234	4	240	2
18	842	1 101	0.765 3		0.087 9	0.002 6	0	0	0	0	1 381		58	0	0	0	0
19	416	1 046	0.398 0		0.068 5	0.010 4	0.244 6	0.003 6	0.030 8	0.000 4	883		319	222	3	196	3
20	426	1 208	0.352 7		0.054 6	0.000 7	0.231 4	0.003 7	0.030 7	0.000 3	398		31	211	3	195	2
21	252	819	0.308 0		0.051 1	0.001 2	0.216 3	0.005 2	0.030 7	0.000 3	256		54	199	4	195	2
22	265	813	0.326 1		0.049 7	0.000 9	0.212 3	0.004 1	0.030 9	0.000 2	189		41	196	3	196	2
23	343	981	0.350 1		0.055 4	0.000 9	0.233 4	0.003 7	0.030 7	0.000 4	428		35	213	3	195	2
24	334	964	0.346 3		0.050 3	0.000 9	0.213 3	0.004 2	0.030 7	0.000 4	209		41	196	3	195	2
25	352	945	0.372 9		0.055 3	0.001 0	0.237 4	0.003 6	0.030 9	0.000 5	433		41	216	3	196	3
26	281	870	0.323 3		0.051 1	0.000 9	0.217 6	0.003 9	0.030 9	0.000 4	256		38	200	3	196	2
27	267	826	0.323 3		0.052 9	0.000 8	0.223 8	0.004 0	0.030 7	0.000 4	324		40	205	3	195	3
28	376	965	0.389 7		0.056 5	0.002 0	0.291 3	0.020 2	0.037 8	0.001 2	472		78	260	16	239	7
29	275	823	0.334 6		0.078 0	0.023 8	0.485 1	0.190 8	0.038 2	0.001 3	1 147		634	402	131	241	8
30	270	820	0.329 4		0.050 2	0.001 2	0.211 7	0.005 1	0.030 6	0.000 4	211		56	195	4	194	2
31	417	1 140	0.365 6		0.049 9	0.000 9	0.211 3	0.004 7	0.030 6	0.000 4	191		43	195	4	194	3
32	541	947	0.571 5		0.060 8	0.001 0	0.582 5	0.262 7	0.036 5	0.001 6	632		33	466	170	231	10

编号	岩性	SiO₂	TiO₂	Al₂O₃	Fe₂O₃	FeO	MnO		MgO		CaO		Na₂O	K₂O		P₂O₅		H₂O	烧失量
1611TSH-P-10	枕状玄武岩	52.30	3.55	10.83	5.48	4.54	0.15		5.87		8.27		2.27	3.55		0.35		0.57	2.92
1611TSH-P-11	枕状玄武岩	51.03	3.64	10.58	5.65	5.10	0.16		6.38		8.89		2.71	2.22		0.36		0.60	3.58
1611TSH-P-12	枕状玄武岩	50.88	3.63	10.68	5.31	5.33	0.14		6.34		9.05		2.00	3.34		0.34		0.53	2.97
PⅦ-9	玄武岩	52.44	3.44	9.99	7.01	3.80	0.13		5.88		10.34		4.39	0.25		0.33		0.32	1.89
PⅦ-10	玄武岩	51.65	3.51	10.60	7.27	3.99	0.13		5.98		9.16		4.74	0.37		0.34		0.32	1.94
PⅦ-11	玄武岩	48.84	3.63	10.29	7.26	4.67	0.14		7.33		10.05		3.98	0.54		0.35		0.60	2.95
0831-5	英安岩	62.22	0.73	15.60	2.16	1.56	0.07		3.08		3.21		4.46	3.31		0.19		0.50	2.78
1611TSH-7	英安岩	62.46	0.70	15.84	2.32	1.71	0.06		2.86		2.48		4.35	3.60		0.24		0.49	3.23
1611TSH-8	英安岩	64.72	0.48	15.71	1.21	1.27	0.07		2.16		3.32		3.31	3.54		0.22		0.63	3.74
1611TSH-9	英安岩	65.63	0.50	15.69	1.28	0.97	0.06		2.43		2.69		3.17	3.17		0.22		0.89	3.86
编号	岩性	Rb	Sr	Ba	Nb	Nb	Ta		Cr		Sc		Zr	Hf		Th		U	Ti
1611TSH-P-10	枕状玄武岩	77.40	97.30	364	30.40	30.40	1.90		241.00		17.70		249.00	7.00		4.48		0.89	21 277
1611TSH-P-11	枕状玄武岩	69.40	90.40	309	31.70	31.70	0.90		261.00		18.60		254.00	5.00		5.64		0.96	21 816
1611TSH-P-12	枕状玄武岩	82.10	97.70	267	31.70	31.70	0.75		244.00		18.80		250.00	5.50		5.71		0.96	21 756
PⅦ-9	玄武岩	5.90	180.00	38	35.30	35.30	2.44		391.00		25.40		243.00	3.80		2.50		1.01	20 650
PⅦ-10	玄武岩	8.19	179.00	63	33.70	33.70	2.21		369.00		25.10		250.00	5.10		3.32		0.72	19 211
PⅦ-11	玄武岩	14.90	215.00	74	36.80	36.80	2.57		491.00		26.70		257.00	5.00		3.46		0.83	21 199
0831-5	英安岩	115.00	401.00	653	23.10	23.10	1.79		53.10		15.20		164.00	4.90		13.70		3.86	4 325
1611TSH-7	英安岩	104.00	341.00	605	19.30	19.30	1.59		95.80		11.10		192.00	6.00		14.30		3.76	4 195
1611TSH-8	英安岩	124.00	237.00	571	20.90	20.90	1.50		59.20		8.88		187.00	5.50		16.80		9.17	2 877
1611TSH-9	英安岩	116.00	215.00	531	21.90	21.90	0.67		55.50		11.10		185.00	6.50		19.50		5.99	2 997
编号	岩性	K	P	Y	La	Ce	Pr		Nd		Sm		Eu	Gd		Tb		Dy	Ho
1611TSH-P-10	枕状玄武岩	30 318	1 573	24.40	37.90	76.20	9.97		45.40		8.75		2.54	8.27		1.16		6.42	1.08
1611TSH-P-11	枕状玄武岩	19 046	1 625	27.30	37.60	74.50	9.69		43.10		8.71		2.54	8.10		1.18		6.40	1.11
1611TSH-P-12	枕状玄武岩	28 560	1 530	26.60	36.90	75.60	9.91		43.89		8.45		2.55	8.29		1.20		6.43	1.09
PⅦ-9	玄武岩	2 074	1 441	19.90	31.40	68.90	8.97		38.50		8.20		2.30	7.67		1.30		7.60	1.30
PⅦ-10	玄武岩	3 070	1 485	20.10	31.60	64.90	8.43		36.30		7.67		2.19	7.09		1.24		7.25	1.23
PⅦ-11	玄武岩	4 481	1 528	20.20	32.30	68.10	9.01		39.10		8.57		2.39	8.01		1.37		7.91	1.38
0831-5	英安岩	27 466	830	19.10	39.70	74.70	8.01		30.40		5.51		1.34	5.26		0.89		5.50	1.01
1611TSH-7	英安岩	30 918	1 085	24.08	41.87	75.64	8.50		32.84		5.85		1.29	5.70		0.85		4.85	0.90
1611TSH-8	英安岩	30 594	1 000	24.78	49.20	88.50	10.13		38.30		6.78		1.29	6.41		0.86		4.84	0.85
1611TSH-9	英安岩	27 454	1 003	24.30	48.90	85.70	9.74		35.60		6.68		1.20	6.07		0.84		4.70	0.84
编号	岩性	Er	Tm	Yb	Lu	ΣREE		LREE		HREE		LREE/HREE			La_N/Yb_N		δEu			δCe
1611TSH-P-10	枕状玄武岩	2.80	0.39	2.18	0.32	203.38		180.76		22.62		7.99			12.47		0.90			0.94
1611TSH-P-11	枕状玄武岩	2.90	0.36	2.30	0.31	198.80		176.14		22.66		7.77			11.73		0.91			0.93
1611TSH-P-12	枕状玄武岩	2.80	0.35	2.19	0.31	199.96		177.30		22.66		7.82			12.09		0.92			0.95
PⅦ-9	玄武岩	3.35	0.46	2.73	0.45	183.13		158.27		24.86		6.37			8.25		0.87			0.99
PⅦ-10	玄武岩	3.29	0.45	2.59	0.40	174.63		151.09		23.54		6.42			8.75		0.89			0.96
PⅦ-11	玄武岩	3.61	0.51	3.05	0.41	185.72		159.47		26.25		6.08			7.60		0.87			0.96
0831-5	英安岩	3.28	0.49	3.13	0.50	179.72		159.66		20.06		7.96			9.10		0.75			0.97
1611TSH-7	英安岩	2.66	0.40	2.57	0.41	184.34		166.00		18.34		9.05			11.70		0.67			0.93
1611TSH-8	英安岩	2.43	0.37	2.44	0.35	212.75		194.20		18.55		10.47			14.46		0.59			0.92
1611TSH-9	英安岩	2.50	0.35	2.29	0.35	205.76		187.82		17.94		10.47			15.32		0.57			0.91

编号	岩性	SiO₂	TiO₂	Al₂O₃	Fe₂O₃	FeO	MnO		MgO		CaO		Na₂O	K₂O		P₂O₅		H₂O	烧失量
1611TSH-P-10	枕状玄武岩	52.30	3.55	10.83	5.48	4.54	0.15		5.87		8.27		2.27	3.55		0.35		0.57	2.92
1611TSH-P-11	枕状玄武岩	51.03	3.64	10.58	5.65	5.10	0.16		6.38		8.89		2.71	2.22		0.36		0.60	3.58
1611TSH-P-12	枕状玄武岩	50.88	3.63	10.68	5.31	5.33	0.14		6.34		9.05		2.00	3.34		0.34		0.53	2.97
PⅦ-9	玄武岩	52.44	3.44	9.99	7.01	3.80	0.13		5.88		10.34		4.39	0.25		0.33		0.32	1.89
PⅦ-10	玄武岩	51.65	3.51	10.60	7.27	3.99	0.13		5.98		9.16		4.74	0.37		0.34		0.32	1.94
PⅦ-11	玄武岩	48.84	3.63	10.29	7.26	4.67	0.14		7.33		10.05		3.98	0.54		0.35		0.60	2.95
0831-5	英安岩	62.22	0.73	15.60	2.16	1.56	0.07		3.08		3.21		4.46	3.31		0.19		0.50	2.78
1611TSH-7	英安岩	62.46	0.70	15.84	2.32	1.71	0.06		2.86		2.48		4.35	3.60		0.24		0.49	3.23
1611TSH-8	英安岩	64.72	0.48	15.71	1.21	1.27	0.07		2.16		3.32		3.31	3.54		0.22		0.63	3.74
1611TSH-9	英安岩	65.63	0.50	15.69	1.28	0.97	0.06		2.43		2.69		3.17	3.17		0.22		0.89	3.86
编号	岩性	Rb	Sr	Ba	Nb	Nb	Ta		Cr		Sc		Zr	Hf		Th		U	Ti
1611TSH-P-10	枕状玄武岩	77.40	97.30	364	30.40	30.40	1.90		241.00		17.70		249.00	7.00		4.48		0.89	21 277
1611TSH-P-11	枕状玄武岩	69.40	90.40	309	31.70	31.70	0.90		261.00		18.60		254.00	5.00		5.64		0.96	21 816
1611TSH-P-12	枕状玄武岩	82.10	97.70	267	31.70	31.70	0.75		244.00		18.80		250.00	5.50		5.71		0.96	21 756
PⅦ-9	玄武岩	5.90	180.00	38	35.30	35.30	2.44		391.00		25.40		243.00	3.80		2.50		1.01	20 650
PⅦ-10	玄武岩	8.19	179.00	63	33.70	33.70	2.21		369.00		25.10		250.00	5.10		3.32		0.72	19 211
PⅦ-11	玄武岩	14.90	215.00	74	36.80	36.80	2.57		491.00		26.70		257.00	5.00		3.46		0.83	21 199
0831-5	英安岩	115.00	401.00	653	23.10	23.10	1.79		53.10		15.20		164.00	4.90		13.70		3.86	4 325
1611TSH-7	英安岩	104.00	341.00	605	19.30	19.30	1.59		95.80		11.10		192.00	6.00		14.30		3.76	4 195
1611TSH-8	英安岩	124.00	237.00	571	20.90	20.90	1.50		59.20		8.88		187.00	5.50		16.80		9.17	2 877
1611TSH-9	英安岩	116.00	215.00	531	21.90	21.90	0.67		55.50		11.10		185.00	6.50		19.50		5.99	2 997
编号	岩性	K	P	Y	La	Ce	Pr		Nd		Sm		Eu	Gd		Tb		Dy	Ho
1611TSH-P-10	枕状玄武岩	30 318	1 573	24.40	37.90	76.20	9.97		45.40		8.75		2.54	8.27		1.16		6.42	1.08
1611TSH-P-11	枕状玄武岩	19 046	1 625	27.30	37.60	74.50	9.69		43.10		8.71		2.54	8.10		1.18		6.40	1.11
1611TSH-P-12	枕状玄武岩	28 560	1 530	26.60	36.90	75.60	9.91		43.89		8.45		2.55	8.29		1.20		6.43	1.09
PⅦ-9	玄武岩	2 074	1 441	19.90	31.40	68.90	8.97		38.50		8.20		2.30	7.67		1.30		7.60	1.30
PⅦ-10	玄武岩	3 070	1 485	20.10	31.60	64.90	8.43		36.30		7.67		2.19	7.09		1.24		7.25	1.23
PⅦ-11	玄武岩	4 481	1 528	20.20	32.30	68.10	9.01		39.10		8.57		2.39	8.01		1.37		7.91	1.38
0831-5	英安岩	27 466	830	19.10	39.70	74.70	8.01		30.40		5.51		1.34	5.26		0.89		5.50	1.01
1611TSH-7	英安岩	30 918	1 085	24.08	41.87	75.64	8.50		32.84		5.85		1.29	5.70		0.85		4.85	0.90
1611TSH-8	英安岩	30 594	1 000	24.78	49.20	88.50	10.13		38.30		6.78		1.29	6.41		0.86		4.84	0.85
1611TSH-9	英安岩	27 454	1 003	24.30	48.90	85.70	9.74		35.60		6.68		1.20	6.07		0.84		4.70	0.84
编号	岩性	Er	Tm	Yb	Lu	ΣREE		LREE		HREE		LREE/HREE			La_N/Yb_N		δEu			δCe
1611TSH-P-10	枕状玄武岩	2.80	0.39	2.18	0.32	203.38		180.76		22.62		7.99			12.47		0.90			0.94
1611TSH-P-11	枕状玄武岩	2.90	0.36	2.30	0.31	198.80		176.14		22.66		7.77			11.73		0.91			0.93
1611TSH-P-12	枕状玄武岩	2.80	0.35	2.19	0.31	199.96		177.30		22.66		7.82			12.09		0.92			0.95
PⅦ-9	玄武岩	3.35	0.46	2.73	0.45	183.13		158.27		24.86		6.37			8.25		0.87			0.99
PⅦ-10	玄武岩	3.29	0.45	2.59	0.40	174.63		151.09		23.54		6.42			8.75		0.89			0.96
PⅦ-11	玄武岩	3.61	0.51	3.05	0.41	185.72		159.47		26.25		6.08			7.60		0.87			0.96
0831-5	英安岩	3.28	0.49	3.13	0.50	179.72		159.66		20.06		7.96			9.10		0.75			0.97
1611TSH-7	英安岩	2.66	0.40	2.57	0.41	184.34		166.00		18.34		9.05			11.70		0.67			0.93
1611TSH-8	英安岩	2.43	0.37	2.44	0.35	212.75		194.20		18.55		10.47			14.46		0.59			0.92
1611TSH-9	英安岩	2.50	0.35	2.29	0.35	205.76		187.82		17.94		10.47			15.32		0.57			0.91