Petrogenesis and Geodynamic Setting of Granite Porphyry Dike in Saibagou Gold Deposit,Northern Margin of Qaidam: Evidence from Geochronology and Geochemistry

doi:10.19657/j.geoscience.1000-8527.2021.052

Abstract

Abstract:

The medium-sized Saibagou quartz vein-type gold deposit is located in the eastern part of the northern margin of Qaidam. The granite porphyry zircon U-Pb geochronology and geochemistry were analyzed in this study. The LA-ICP-MS zircon U-Pb dating yielded (372.4±4.1) Ma, indicating Late Devonian magmatism. The granite porphyry is characterized by high SiO₂ and alkali-rich, with differentiation index (DI) of 81.40-84.54 and solidification index (SI) of 3.56-8.17, indicating substantial fractionation. The geochemical features show remarkable enrichments in La, Hf, Rb, and Th, but depletions in Nb, Ta, P, Ti, Ba, and Sr. The total rare-earth element (ΣREE) is 71.80×10^-6-75.21×10^-6, and the REE patterns are right-inclining with slightly negative Eu anomalies (δEu=0.77-0.96). Discriminant diagram shows that the granite porphyry is peraluminous calc-alkaline I-type, and was likely formed in a post-orogenic setting during the Middle-Late Devonian intracontinental extension in the northern margin of Qaidam. The granitic magmatism was likely syn-ore and occurred close to the orebodies and filled in structures. Therefore, the maximum age of the Saibagou gold mineralization can be set at 372.4 Ma, and future prospecting work should focus on the granitic porphyry dikes.

Key words: granite porphyry, geochronology, geochemistry, tectonic setting, Saibagou gold deposit, northern margin of Qaidam

CLC Number:

ZHU Dequan, TANG Mingying, DING Zhengjiang, ZHU Haibo, WANG Weixiao, ZHANG Yu, HE Zongwei, WU Hongbin. Petrogenesis and Geodynamic Setting of Granite Porphyry Dike in Saibagou Gold Deposit,Northern Margin of Qaidam: Evidence from Geochronology and Geochemistry[J]. Geoscience, 2022, 36(03): 898-910.

Figures/Tables 12

References 37

[1]	韩生福, 章午生, 张以茀, 等. 青海省第三轮成矿远景区划研究及找矿靶区预测报告[R]. 西宁: 青海省国土资源厅, 2004.
[2]	付青元, 李宝林. 赛坝沟金矿成矿特征及控矿条件[J]. 青海地质, 1998, 7(1):43-49.
[3]	张拴宏, 周显强, 田晓娟, 等. 青海乌兰县托莫尔日特金矿区稳定同位素特征及其地质意义[J]. 地质与勘探, 2001, 37(5):10-14.
[4]	张拴宏, 周显强, 纪占胜. 韧-脆性剪切带构造控矿演化模式——以青海省乌兰县托莫尔日特金矿区为例[J]. 矿物岩石, 2003, 23(1):37-41.
[5]	童海奎, 张顺桂, 许国武, 等. 乌兰县赛坝沟韧性剪切带型金矿特征及成因[J]. 西北地质, 2009, 42(1):88-94.
[6]	张德全, 党兴彦, 佘宏全, 等. 柴北缘—东昆仑地区造山型金矿床的Ar-Ar测年及其地质意义[J]. 矿床地质, 2005, 24(2):87-98.
[7]	王振强, 王启蒙, 冯建之, 等. 青海省乌兰县赛坝沟地区J47E020009、J47E020010两幅1∶5万区域地质矿产调查报告[R]. 洛阳:河南省地质矿产勘查开发局第一地质矿产调查院, 2017.
[8]	张德全, 王富春, 佘宏全, 等. 柴北缘—东昆仑地区造山型金矿床三级控矿构造系统[J]. 中国地质, 2007, 34(1):92-100.
[9]	杨经绥, 张建新, 孟繁聪, 等. 中国西部柴北缘—阿尔金的超高压变质榴辉岩及其原岩性质探讨[J]. 地学前缘, 2003, 10(3):291-314.
[10]	YANG J S, WU C L, ZHANG J X, et al. Protolith of eclogites in the North Qaidam and Altun UHP terrane, NW China: Earlier oceanic crust?[J]. Journal of Asian Earth Sciences, 2006, 28(2/3): 185-204. DOI URL
[11]	ZHANG J X, YANG J S, MENG F C, et al. U-Pb isotopic studies of eclogites and their host gneisses in the Xitieshan area of the North Qaidam mountains, western China:New evidence for an Early Paleozoic HP-UHP metamorphic belt[J]. Journal of Asian Earth Sciences, 2006, 28(2/3): 143-150. DOI URL
[12]	PENG Y B, YU S Y, LI S Z, et al. Early Neoproterozoic magmatic imprints in the Altun-Qilian-Kunlun region of the Qinghai-Tibet Plateau: Response to the assembly and breakup of Rodinia supercontinent[J]. Earth Science Reviews, 2019, 199:102954. DOI URL
[13]	SONG S G, ZHANG L F, NIU Y L, et al. Geochronology of diamond-bearing zircons from garnet peridotite in the North Qai-dam UHPM belt, Northern Tibetan Plateau: A record of complex histories from oceanic lithosphere subduction to continental collision[J]. Earth and Planetary Science Letters, 2005, 234(1/2): 99-118. DOI URL
[14]	SONG S G, ZHANG L F, NIU Y L, et al. Evolution from oceanic subduction to continental collision: A case study from the Northern Tibetan Plateau based on geochemical and geochronological data[J]. Journal of Petrology, 2006, 47(3): 435-455. DOI URL
[15]	SONG S G, NIU Y L, SU L, et al. Continental orogenesis from ocean subduction,continent collision/subduction,to orogen collapse,and orogen recycling: The example of the north Qai-dam UHPM belt, NW China[J]. Earth Science Reviews, 2014, 129: 59-84. DOI URL
[16]	ZHANG G B, SONG S G, ZHANG L F, et al. The subducted oceanic crust within continental-type UHP metamorphic belt in the North Qaidam, NW China:Evidence from petrology, geochemistry and geochronology[J]. Lithos, 2008, 104(1/2/3/4): 99-118. DOI URL
[17]	ZHANG G B, ZHANG L F, SONG S G, et al. UHP metamorphic evolution and SHRIMP geochronology of a coesite-bearing meta-ophiolitic gabbro in the North Qaidam, NW China[J]. Journal of Asian Earth Sciences, 2009, 35(3/4): 310-322. DOI URL
[18]	ZHANG J X, MATTINSON C G, YU S Y, et al. U-Pb zircon geochronology of coesite-bearing eclogites from the southern Dulan area of the North Qaidam UHP terrane, northwestern China:Spatially and temporally extensive UHP metamorphism during continental subduction[J]. Journal of Metamorphic Geology, 2010, 28(9): 955-978. DOI URL
[19]	ZHANG J X, YU S Y, MATTINSON C G. Early Paleozoic polyphase metamorphism in northern Tibet, China[J]. Gondwana Research, 2017, 41: 267-289. DOI URL
[20]	CHEN D L, LIU L, SUN Y, et al. Geochemistry and zircon U-Pb dating and its implications of the Yukahe HP/UHP terrane, the North Qaidam, NW China[J]. Journal of Asian Earth Sciences, 2009, 35(3/4): 259-272. DOI URL
[21]	YU S Y, LI S Z, ZHANG J X, et al. Multistage anatexis during tectonic evolution from oceanic subduction to continentalcollision: A review of the North Qaidam UHP Belt, NW China[J]. Earth Science Reviews, 2019, 191: 190-211. DOI URL
[22]	YU S Y, ZHANG J X, LI S Z, et al. TTG-adakitic-like (tona-litic-trondhjemitic) magmas resulting from partial melting of metagabbro under high-pressure condition during continental collision in the north Qaidam UHP terrane, western China[J]. Tectonics, 2019, 38(3): 791-822. DOI URL
[23]	袁桂邦, 王惠初, 李惠民, 等. 柴北缘绿梁山地区辉长岩的锆石U-Pb年龄及意义[J]. 前寒武纪研究进展, 2002, 25(1):36-40.
[24]	赵风清, 郭进京, 李怀坤. 青海锡铁山地区滩间山群的地质特征及同位素年代学[J]. 地质通报, 2003, 22(1):28-31.
[25]	史仁灯, 杨经绥, 吴才来, 等. 柴达木北缘超高压变质带中的岛弧火山岩[J]. 地质学报, 2004, 78(1):52-64.
[26]	吴才来, 杨经绥, TREVORL R, 等. 祁连南缘嗷唠山花岗岩SHRIMP锆石年龄及其地质意义[J]. 岩石学报, 2001, 17(2):215-221.
[27]	WU C L, GAO Y H, LI Z L, et al. Zircon SHRIMP U-Pb da-ting of granites from Dulan and the chronological framework of the North Qaidam UHP belt, NW China[J]. Science China (Earth Sciences), 2014, 57(12): 2945-2965. DOI URL
[28]	朱小辉. 柴达木盆地北缘滩间山群火山岩地球化学及年代学研究[D]. 西安: 西北大学, 2011.
[29]	庄玉军, 辜平阳, 李培庆, 等. 柴北缘构造带欧龙布鲁克地块西北缘辉长岩脉地球化学、年代学及Hf同位素特征[J]. 地质通报, 2019, 38(11):1801-1812.
[30]	韩建军, 宋传中, 何俊, 等. 柴北缘牛鼻子梁地区闪长-花岗质岩体锆石U-Pb年龄、地球化学特征及地质意义[J]. 大地构造与成矿学, 2020, 44(1):157-170.
[31]	WU C L, WU D, CHRIS M, et al. Petrogenesis of granitoids in the Wulan area: Magmatic activity and tectonic evolution in the North Qaidam, NW China[J]. Gondwana Research, 2019, 67:147-171. DOI URL
[32]	唐名鹰, 彭永和, 朱德全, 等. 青海赛坝沟金矿床Ⅳ-3号矿体原生晕特征与深部预测[J]. 物探与化探, 2016, 40(3):475-481.
[33]	QI L, HU J, GREGOIRE D C. Determination of trace elements in granites by inductively coupled plasma mass spectrometry[J]. Talanta, 2000, 51(3): 507-513. DOI URL
[34]	WHALEN J B, CURRIE K L, CHAPPEL B W. A type gra-nites: geochemical characteristics, discrimination and petrogenesis[J]. Contribution to Mineralogy and Petrology, 1987, 95(4): 407-419. DOI URL
[35]	MANIAR P D, PICCOLI P M. Tectonic Discrimination of Granitoids[J]. Geological Society of America Bulletin, 1989, 101: 635-643. DOI URL
[36]	李衍业, 王洪泰, 宋生春, 等. 柴北缘乌达热乎地区断裂控矿特征及金矿成因探讨[J]. 青海大学学报(自然科学版), 2001, 29(4):73-79.
[37]	丰成友, 张德全, 李大新, 等. 青海赛坝沟金矿地质特征及成矿时代[J]. 矿床地质, 2002, 21(1):45-52.

测点号	含量/10^-6			Th/U	同位素比值					年龄/Ma
测点号	Pb总量	²³²Th	²³⁸U	Th/U	²⁰⁷Pb/²⁰⁶Pb ±1σ	²⁰⁷Pb/²³⁵U ±1σ	²⁰⁶Pb/²³⁸U ±1σ	²⁰⁸Pb/²³²Th ±1σ		²⁰⁷Pb/ ²⁰⁶Pb	²⁰⁷Pb/ ²³⁵U	²⁰⁶Pb/ ²³⁸U	²⁰⁸Pb/ ²³²Th
1	47	353	266	1.324	0.056±0.002	0.461±0.018	0.059±0.001	0.017±0.001	472		385	372.43	337
2	65	451	378	1.193	0.057±0.002	0.468±0.018	0.059±0.002	0.018±0.001	502		390	372.38	356
3	26	171	153	1.118	0.050±0.002	0.411±0.014	0.060±0.001	0.018±0.001	209		350	372.66	362
4	30	111	354	0.314	0.058±0.003	0.484±0.040	0.059±0.002	0.018±0.003	520		401	372.18	365
5	47	359	274	1.311	0.054±0.002	0.449±0.021	0.059±0.001	0.018±0.001	372		377	372.12	351
6	451	4 852	4 505	1.077	0.054±0.001	0.448±0.014	0.059±0.002	0.013±0.001	383		376	372.34	259
7	96	749	531	1.409	0.055±0.001	0.456±0.014	0.059±0.001	0.014±0.001	432		382	372.34	286
8	70	392	626	0.625	0.052±0.001	0.427±0.013	0.059±0.001	0.015±0.001	272		361	372.47	302
9	222	1 987	771	2.578	0.054±0.001	0.443±0.014	0.060±0.001	0.016±0.001	365		372	373.14	315
10	73	601	388	1.549	0.053±0.002	0.433±0.015	0.060±0.002	0.016±0.001	317		365	372.37	311
11	18	108	138	0.782	0.053±0.003	0.427±0.025	0.059±0.002	0.017±0.001	328		361	372.35	347
12	136	233	2 227	0.105	0.052±0.001	0.429±0.012	0.059±0.001	0.019±0.001	295		363	372.46	377
13	29	208	214	0.971	0.049±0.002	0.400±0.015	0.059±0.001	0.013±0.001	128		341	372.37	260
14	56	449	275	1.633	0.052±0.002	0.426±0.015	0.059±0.001	0.015±0.001	280		361	372.74	300
15	51	412	259	1.594	0.054±0.002	0.443±0.019	0.059±0.002	0.016±0.001	372		372	372.85	318
16	15	103	96	1.073	0.050±0.003	0.409±0.024	0.059±0.002	0.015±0.001	217		348	371.35	303
17	42	330	258	1.280	0.053±0.002	0.436±0.013	0.059±0.001	0.014±0.001	339		367	372.50	282
18	19	126	137	0.919	0.055±0.003	0.448±0.024	0.059±0.001	0.015±0.001	398		376	372.38	307
19	28	181	178	1.015	0.054±0.002	0.443±0.019	0.059±0.001	0.020±0.001	376		373	372.55	394
20	55	394	352	1.119	0.051±0.002	0.420±0.012	0.059±0.001	0.017±0.001	257		356	372.46	333
21	30	207	230	0.901	0.051±0.002	0.399±0.016	0.057±0.001	0.014±0.001	250		341	355.38	272
22	25	159	162	0.981	0.056±0.003	0.438±0.025	0.057±0.001	0.020±0.002	435		369	355.72	394
23	41	286	256	1.117	0.053±0.002	0.411±0.016	0.057±0.001	0.016±0.002	320		349	355.91	312
24	61	429	388	1.104	0.054±0.002	0.423±0.014	0.057±0.001	0.015±0.002	361		358	355.51	302
25	39	239	299	0.800	0.053±0.002	0.481±0.017	0.066±0.002	0.015±0.001	328		399	409.85	310
26	118	620	723	0.857	0.053±0.001	0.546±0.029	0.076±0.005	0.021±0.001	339		443	471.77	418
27	87	389	600	0.648	0.050±0.001	0.534±0.019	0.077±0.002	0.021±0.001	198		434	476.50	424

测点号	含量/10^-6			Th/U	同位素比值					年龄/Ma
测点号	Pb总量	²³²Th	²³⁸U	Th/U	²⁰⁷Pb/²⁰⁶Pb ±1σ	²⁰⁷Pb/²³⁵U ±1σ	²⁰⁶Pb/²³⁸U ±1σ	²⁰⁸Pb/²³²Th ±1σ		²⁰⁷Pb/ ²⁰⁶Pb	²⁰⁷Pb/ ²³⁵U	²⁰⁶Pb/ ²³⁸U	²⁰⁸Pb/ ²³²Th
1	47	353	266	1.324	0.056±0.002	0.461±0.018	0.059±0.001	0.017±0.001	472		385	372.43	337
2	65	451	378	1.193	0.057±0.002	0.468±0.018	0.059±0.002	0.018±0.001	502		390	372.38	356
3	26	171	153	1.118	0.050±0.002	0.411±0.014	0.060±0.001	0.018±0.001	209		350	372.66	362
4	30	111	354	0.314	0.058±0.003	0.484±0.040	0.059±0.002	0.018±0.003	520		401	372.18	365
5	47	359	274	1.311	0.054±0.002	0.449±0.021	0.059±0.001	0.018±0.001	372		377	372.12	351
6	451	4 852	4 505	1.077	0.054±0.001	0.448±0.014	0.059±0.002	0.013±0.001	383		376	372.34	259
7	96	749	531	1.409	0.055±0.001	0.456±0.014	0.059±0.001	0.014±0.001	432		382	372.34	286
8	70	392	626	0.625	0.052±0.001	0.427±0.013	0.059±0.001	0.015±0.001	272		361	372.47	302
9	222	1 987	771	2.578	0.054±0.001	0.443±0.014	0.060±0.001	0.016±0.001	365		372	373.14	315
10	73	601	388	1.549	0.053±0.002	0.433±0.015	0.060±0.002	0.016±0.001	317		365	372.37	311
11	18	108	138	0.782	0.053±0.003	0.427±0.025	0.059±0.002	0.017±0.001	328		361	372.35	347
12	136	233	2 227	0.105	0.052±0.001	0.429±0.012	0.059±0.001	0.019±0.001	295		363	372.46	377
13	29	208	214	0.971	0.049±0.002	0.400±0.015	0.059±0.001	0.013±0.001	128		341	372.37	260
14	56	449	275	1.633	0.052±0.002	0.426±0.015	0.059±0.001	0.015±0.001	280		361	372.74	300
15	51	412	259	1.594	0.054±0.002	0.443±0.019	0.059±0.002	0.016±0.001	372		372	372.85	318
16	15	103	96	1.073	0.050±0.003	0.409±0.024	0.059±0.002	0.015±0.001	217		348	371.35	303
17	42	330	258	1.280	0.053±0.002	0.436±0.013	0.059±0.001	0.014±0.001	339		367	372.50	282
18	19	126	137	0.919	0.055±0.003	0.448±0.024	0.059±0.001	0.015±0.001	398		376	372.38	307
19	28	181	178	1.015	0.054±0.002	0.443±0.019	0.059±0.001	0.020±0.001	376		373	372.55	394
20	55	394	352	1.119	0.051±0.002	0.420±0.012	0.059±0.001	0.017±0.001	257		356	372.46	333
21	30	207	230	0.901	0.051±0.002	0.399±0.016	0.057±0.001	0.014±0.001	250		341	355.38	272
22	25	159	162	0.981	0.056±0.003	0.438±0.025	0.057±0.001	0.020±0.002	435		369	355.72	394
23	41	286	256	1.117	0.053±0.002	0.411±0.016	0.057±0.001	0.016±0.002	320		349	355.91	312
24	61	429	388	1.104	0.054±0.002	0.423±0.014	0.057±0.001	0.015±0.002	361		358	355.51	302
25	39	239	299	0.800	0.053±0.002	0.481±0.017	0.066±0.002	0.015±0.001	328		399	409.85	310
26	118	620	723	0.857	0.053±0.001	0.546±0.029	0.076±0.005	0.021±0.001	339		443	471.77	418
27	87	389	600	0.648	0.050±0.001	0.534±0.019	0.077±0.002	0.021±0.001	198		434	476.50	424

序号	样品号	SiO₂	Al₂O₃	Fe₂O₃	FeO	MgO	CaO	K₂O	H₂O⁺	TiO₂	P₂O₅	MnO	CO₂
1	GSX01	71.83	13.64	2.49	1.50	0.81	1.72	1.64	0.32	0.17	0.05	0.05	0.24
2	GSX04	72.92	13.25	2.60	0.85	0.35	1.39	1.52	0.34	0.14	0.05	0.03	0.14
3	19021	74.84	13.12	2.21	1.32	0.32	1.67	1.59	0.48	0.15	0.04	0.06	0.12
4	19022	73.23	13.70	2.45	0.98	0.57	1.18	1.48	0.21	0.17	0.05	0.04	0.16
序号	样品号	Na₂O	LOI (烧失量)	合计	Qtz (石英)	An (钙长石)	Ab (钠长石)	Or (钾长石)	σ (里特曼指数)	DI (分异指数)	Na₂O/ K₂O	SI (固结指数)	AR (碱度率)
1	GSX01	3.47	1.66	99.58	41.38	6.85	30.09	9.93	0.91	81.40	2.12	8.17	2.65
2	GSX04	3.74	2.42	99.73	42.53	5.85	32.59	9.25	0.92	84.38	2.46	3.86	3.09
3	19021	3.56	2.32	101.81	44.01	7.32	30.34	9.46	0.83	83.82	2.24	3.56	2.86
4	19022	3.67	2.94	100.83	43.77	4.63	31.81	8.96	0.88	84.54	2.48	6.23	2.95
序号	样品号	A/CNK (铝饱和指数)	Sc	Cr	Zn	U	Rb	Zr	Nb	Hf	Ta	Th	Ba
1	GSX01	1.30	7.07	11.37	80.93	1.13	37.24	96.58	2.72	4.10	0.43	6.22	220.67
2	GSX04	1.30	2.13	7.88	44.45	1.20	37.98	100.35	1.97	3.70	0.21	5.80	195.55
3	19021	1.20	6.54	10.88	32.65	1.17	37.34	98.54	2.05	3.80	0.34	6.87	200.43
4	19022	1.40	3.68	9.65	19.54	1.23	37.11	102.76	2.54	4.00	0.29	6.12	211.65
序号	样品号	Sr	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er
1	GSX01	181.83	17.20	28.50	3.74	13.97	2.60	0.75	2.22	0.34	1.85	0.33	0.96
2	GSX04	156.11	17.32	30.53	3.64	12.75	2.34	0.66	1.83	0.26	1.18	0.19	0.53
3	19021	165.98	17.43	29.08	3.87	12.87	2.45	0.71	1.94	0.32	1.65	0.43	0.88
4	19022	179.22	17.39	31.54	3.63	13.54	2.58	0.64	2.43	0.28	1.19	0.32	0.79
序号	样品号	Tm	Yb	Lu	Y	REE	LREE	HREE	LREE/HREE		(La/Yb)_N	δEu	δCe
1	GSX01	0.14	0.92	0.15	8.99	73.67	66.76	6.91	9.66		12.60	0.93	0.82
2	GSX04	0.07	0.42	0.08	5.46	71.80	67.24	4.56	14.75		27.80	0.94	0.88
3	19021	0.13	0.76	0.11	6.86	72.63	66.41	6.22	10.68		15.46	0.96	0.82
4	19022	0.10	0.64	0.14	7.24	75.21	69.32	5.89	11.77		18.32	0.77	0.91

序号	样品号	SiO₂	Al₂O₃	Fe₂O₃	FeO	MgO	CaO	K₂O	H₂O⁺	TiO₂	P₂O₅	MnO	CO₂
1	GSX01	71.83	13.64	2.49	1.50	0.81	1.72	1.64	0.32	0.17	0.05	0.05	0.24
2	GSX04	72.92	13.25	2.60	0.85	0.35	1.39	1.52	0.34	0.14	0.05	0.03	0.14
3	19021	74.84	13.12	2.21	1.32	0.32	1.67	1.59	0.48	0.15	0.04	0.06	0.12
4	19022	73.23	13.70	2.45	0.98	0.57	1.18	1.48	0.21	0.17	0.05	0.04	0.16
序号	样品号	Na₂O	LOI (烧失量)	合计	Qtz (石英)	An (钙长石)	Ab (钠长石)	Or (钾长石)	σ (里特曼指数)	DI (分异指数)	Na₂O/ K₂O	SI (固结指数)	AR (碱度率)
1	GSX01	3.47	1.66	99.58	41.38	6.85	30.09	9.93	0.91	81.40	2.12	8.17	2.65
2	GSX04	3.74	2.42	99.73	42.53	5.85	32.59	9.25	0.92	84.38	2.46	3.86	3.09
3	19021	3.56	2.32	101.81	44.01	7.32	30.34	9.46	0.83	83.82	2.24	3.56	2.86
4	19022	3.67	2.94	100.83	43.77	4.63	31.81	8.96	0.88	84.54	2.48	6.23	2.95
序号	样品号	A/CNK (铝饱和指数)	Sc	Cr	Zn	U	Rb	Zr	Nb	Hf	Ta	Th	Ba
1	GSX01	1.30	7.07	11.37	80.93	1.13	37.24	96.58	2.72	4.10	0.43	6.22	220.67
2	GSX04	1.30	2.13	7.88	44.45	1.20	37.98	100.35	1.97	3.70	0.21	5.80	195.55
3	19021	1.20	6.54	10.88	32.65	1.17	37.34	98.54	2.05	3.80	0.34	6.87	200.43
4	19022	1.40	3.68	9.65	19.54	1.23	37.11	102.76	2.54	4.00	0.29	6.12	211.65
序号	样品号	Sr	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er
1	GSX01	181.83	17.20	28.50	3.74	13.97	2.60	0.75	2.22	0.34	1.85	0.33	0.96
2	GSX04	156.11	17.32	30.53	3.64	12.75	2.34	0.66	1.83	0.26	1.18	0.19	0.53
3	19021	165.98	17.43	29.08	3.87	12.87	2.45	0.71	1.94	0.32	1.65	0.43	0.88
4	19022	179.22	17.39	31.54	3.63	13.54	2.58	0.64	2.43	0.28	1.19	0.32	0.79
序号	样品号	Tm	Yb	Lu	Y	REE	LREE	HREE	LREE/HREE		(La/Yb)_N	δEu	δCe
1	GSX01	0.14	0.92	0.15	8.99	73.67	66.76	6.91	9.66		12.60	0.93	0.82
2	GSX04	0.07	0.42	0.08	5.46	71.80	67.24	4.56	14.75		27.80	0.94	0.88
3	19021	0.13	0.76	0.11	6.86	72.63	66.41	6.22	10.68		15.46	0.96	0.82
4	19022	0.10	0.64	0.14	7.24	75.21	69.32	5.89	11.77		18.32	0.77	0.91