西藏切穷地区早白垩世花岗岩年代学和地球化学特征及其构造环境

doi:10.19657/j.geoscience.1000-8527.2019.04.02

摘要/Abstract

摘要：

西藏谢通门县切穷地区发育面积较广的早白垩世花岗岩岩体。为了进一步查明花岗岩的特征、侵入时代及其形成环境,对其进行了地质学、岩石地球化学及年代学研究。岩体LA-ICP-MS锆石U-Pb定年结果表明,研究区花岗岩岩体侵位年龄主要集中于(129.3±0.8)~(130.5±0.9) Ma,属早白垩世。从岩石地球化学特征来看,研究区花岗岩岩体具有高SiO₂(73.19%~76.7%)、富碱(K₂O+Na₂O=7.81%~8.41%)特征,铝饱和指数(A/CNK)介于0.93~1.12之间,为强过铝质花岗岩;贫CaO(0.32%~7.31%)、MgO(0.01%~1.76%),显示明显的负铕(δEu=0.11~1.25)异常,富集Rb、Th、Nd元素,亏损Nb、Sr、P、Ti、K元素。从形成环境来看,研究区花岗岩具有明显的大陆碰撞环境的特征。研究认为,西藏切穷地区早白垩世花岗岩形成于同碰撞环境,但在后碰撞过程中地壳缩短增厚发生拆沉作用,玄武质岩浆岩底侵,经过中下地壳发生改造重熔形成的。

关键词: 锆石U-Pb定年, 岩石地球化学, 花岗岩, 冈底斯, 构造环境

Abstract:

A wide range of Early Cretaceous granitic intrusions were formed in the Qieqiong area in Tibet.To better understand the geological characteristics, intrusion age and petrogenetic environment, we have studied the geology, geochemistry and geochronology of intermediate granite rocks from the area. LA-ICP-MS zircon U-Pb dating shows that the granitoids were emplaced in the Early Cretaceous, from (129.3±0.8) Ma to (130.5±0.9) Ma.Geochemical analyses show that the granitoids are high in SiO₂(73.19%-76.7%), alkali(K₂O+Na₂O=7.81%-8.41%), with A/CNK=0.93 to 1.12, displaying strong peraluminous characteristics. The rocks have low CaO(0.32%-7.31%) and MgO (0.01%-1.76%), and distinct negative Eu anomalies (δEu=0.11-1.25). Primitive-mantle normalized multi-element spider diagram displays apparent enrichments in Rb, Th and Nd, and marked depletions in Nb, Sr, P, Ti and K.These intermediate granitoids show continental collision geochemical affinities. Considering the regional tectonic setting and published information, we infer that the granites at Qieqiong were formed in the a post-collisionalsetting, when crustal thickening and delamination occurred. The magmas were sourced by basaltic magma underplating and the subsequent partial melting of the middle-lower crust.

Key words: zircon U-Pb age, whole-rock geochemistry, granite, Gangdise, tectonic setting

中图分类号:

P588.1

黄泽森, 江巴多吉, 达瓦次仁, 塔尔杰. 西藏切穷地区早白垩世花岗岩年代学和地球化学特征及其构造环境[J]. 现代地质, 2019, 33(04): 703-714.

HUANG Zesen, JIANGBA Duoji, DAWA Ciren, TAER Jie. Geochemistry and Geochronology of Early Cretaceous Granitic Intrusions and Tectonic Setting of Qieqiong Area in Tibet,China[J]. Geoscience, 2019, 33(04): 703-714.

图/表 14

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测点	含量(10^-6)及比值				同位素比值
	U	Th	U/Th		²⁰⁷Pb/ ²³⁵U	±1σ	²⁰⁶Pb/ ²³⁸U	±1σ	²⁰⁷Pb/ ²⁰⁶Pb	±1σ
	U	Th	U/Th	²⁰⁶Pb/ ²³⁸U		±1σ	²⁰⁶Pb/ ²³⁸U	±1σ	²⁰⁷Pb/ ²⁰⁶Pb	±1σ	±1σ				²⁰⁷Pb/ ²³⁵U	±1σ
D0070TW-1	570.9	401.3	2.05	0.1319		0.003 2	0.019 8	0.000 2	0.048 3	0.001 2	126	1	126	3
D0070TW-2	319.5	247.4	1.42	0.133 5		0.004 1	0.020 1	0.000 2	0.048 6	0.001 6	129	1	127	4
D0070TW-3	632.9	423.8	1.29	0.137 8		0.003 0	0.020 1	0.000 2	0.049 7	0.001 1	129	1	131	3
D0070TW-4	518.7	338.2	1.49	0.139 9		0.003 4	0.020 1	0.000 2	0.050 5	0.001 3	129	1	133	3
D0070TW-5	688.0	488.6	1.53	0.134 2		0.003 0	0.020 2	0.000 2	0.047 9	0.001 0	129	1	128	3
D0070TW-6	318.9	759.1	1.41	0.139 5		0.004 3	0.020 6	0.000 2	0.049 5	0.001 6	132	1	133	4
D0070TW-7	697.4	526.1	0.42	0.147 7		0.003 0	0.021 0	0.000 1	0.050 8	0.001 0	134	1	140	3
D0070TW-8	362.4	376.5	0.62	0.137 0		0.003 8	0.020 1	0.000 2	0.049 7	0.001 4	128	1	130	3
D0070TW-9	280.6	371.6	0.96	0.134 2		0.004 3	0.019 8	0.000 2	0.050 1	0.001 7	126	1	128	4
D0070TW-10	266.3	258.2	0.76	0.129 5		0.005 0	0.020 1	0.000 2	0.047 5	0.001 9	128	2	124	1
D0070TW-11	469.9	754.9	1.32	0.134 9		0.003 8	0.019 8	0.000 2	0.049 5	0.001 4	126	1	129	3
DPM07-1	118.7	123.4	1.42	0.171 2		0.008 4	0.020 7	0.000 3	0.062 5	0.003 3	132	2	160	2
DPM07-2	538.8	448.9	1.29	0.150 7		0.004 0	0.020 6	0.000 1	0.052 7	0.001 4	132	1	143	2
DPM07-3	741.3	714.5	1.49	0.147 1		0.002 7	0.020 2	0.000 1	0.052 8	0.001 0	129	1	139	2
DPM07-4	74.9	82.5	1.53	0.139 2		0.011 0	0.020 2	0.000 5	0.053 2	0.004 5	129	3	132	2
DPM07-5	326.6	345.9	1.41	0.147 3		0.004 3	0.020 9	0.000 2	0.051 7	0.001 6	133	1	140	4
DPM07-6	979.6	847.0	0.42	0.136 9		0.002 5	0.020 5	0.000 1	0.048 6	0.000 9	131	1	130	2
DPM07-7	479.4	415.2	0.96	0.134 4		0.003 5	0.020 4	0.000 2	0.047 9	0.001 2	130	1	128	3
DPM07-8	423.5	523.5	0.76	0.142 5		0.004 1	0.020 4	0.000 2	0.050 8	0.001 5	130	1	135	4
DPM07-9	549.5	346.8	1.03	0.132 4		0.003 1	0.020 4	0.000 2	0.047 4	0.001 2	130	1	126	3
DPM07-10	452.8	480.1	0.62	0.140 4		0.004 3	0.020 5	0.000 2	0.049 9	0.001 6	131	1	133	4
DPM07-11	174.1	497.5	0.96	0.154 1		0.008 6	0.020 7	0.000 3	0.054 2	0.003 1	132	2	146	2
DPM07-12	170.0	572.5	1.2	0.140 8		0.006 4	0.020 1	0.000 3	0.051 8	0.002 5	128	2	134	2
DPM07-13	253.6	317.3	1.24	0.147 8		0.006 4	0.020 6	0.000 3	0.052 9	0.002 4	132	2	140	4
DPM07-14	255.3	599.7	0.91	0.134 1		0.004 3	0.019 9	0.000 2	0.049 2	0.001 7	127	1	128	4
DPM07-15	455.7	751.5	0.94	0.146 3		0.003 8	0.020 2	0.000 2	0.052 5	0.001 4	129	1	139	3
DPM07-16	252.7	537.0	1.16	0.141 4		0.004 9	0.019 9	0.000 2	0.052 3	0.001 9	127	1	134	4
DPM07-17	488.9	947.6	1.15	0.137 0		0.005 7	0.020 1	0.000 3	0.050 1	0.002 2	128	2	130	3
DPM07-18	315.5	485.3	0.81	0.141 3		0.004 5	0.020 3	0.000 2	0.050 7	0.001 7	130	1	134	4
DPM07-19	393.6	663.2	1.58	0.140 2		0.004 0	0.020 2	0.000 2	0.050 8	0.001 5	129	1	133	4

测点	含量(10^-6)及比值				同位素比值
	U	Th	U/Th		²⁰⁷Pb/ ²³⁵U	±1σ	²⁰⁶Pb/ ²³⁸U	±1σ	²⁰⁷Pb/ ²⁰⁶Pb	±1σ
	U	Th	U/Th	²⁰⁶Pb/ ²³⁸U		±1σ	²⁰⁶Pb/ ²³⁸U	±1σ	²⁰⁷Pb/ ²⁰⁶Pb	±1σ	±1σ				²⁰⁷Pb/ ²³⁵U	±1σ
D0070TW-1	570.9	401.3	2.05	0.1319		0.003 2	0.019 8	0.000 2	0.048 3	0.001 2	126	1	126	3
D0070TW-2	319.5	247.4	1.42	0.133 5		0.004 1	0.020 1	0.000 2	0.048 6	0.001 6	129	1	127	4
D0070TW-3	632.9	423.8	1.29	0.137 8		0.003 0	0.020 1	0.000 2	0.049 7	0.001 1	129	1	131	3
D0070TW-4	518.7	338.2	1.49	0.139 9		0.003 4	0.020 1	0.000 2	0.050 5	0.001 3	129	1	133	3
D0070TW-5	688.0	488.6	1.53	0.134 2		0.003 0	0.020 2	0.000 2	0.047 9	0.001 0	129	1	128	3
D0070TW-6	318.9	759.1	1.41	0.139 5		0.004 3	0.020 6	0.000 2	0.049 5	0.001 6	132	1	133	4
D0070TW-7	697.4	526.1	0.42	0.147 7		0.003 0	0.021 0	0.000 1	0.050 8	0.001 0	134	1	140	3
D0070TW-8	362.4	376.5	0.62	0.137 0		0.003 8	0.020 1	0.000 2	0.049 7	0.001 4	128	1	130	3
D0070TW-9	280.6	371.6	0.96	0.134 2		0.004 3	0.019 8	0.000 2	0.050 1	0.001 7	126	1	128	4
D0070TW-10	266.3	258.2	0.76	0.129 5		0.005 0	0.020 1	0.000 2	0.047 5	0.001 9	128	2	124	1
D0070TW-11	469.9	754.9	1.32	0.134 9		0.003 8	0.019 8	0.000 2	0.049 5	0.001 4	126	1	129	3
DPM07-1	118.7	123.4	1.42	0.171 2		0.008 4	0.020 7	0.000 3	0.062 5	0.003 3	132	2	160	2
DPM07-2	538.8	448.9	1.29	0.150 7		0.004 0	0.020 6	0.000 1	0.052 7	0.001 4	132	1	143	2
DPM07-3	741.3	714.5	1.49	0.147 1		0.002 7	0.020 2	0.000 1	0.052 8	0.001 0	129	1	139	2
DPM07-4	74.9	82.5	1.53	0.139 2		0.011 0	0.020 2	0.000 5	0.053 2	0.004 5	129	3	132	2
DPM07-5	326.6	345.9	1.41	0.147 3		0.004 3	0.020 9	0.000 2	0.051 7	0.001 6	133	1	140	4
DPM07-6	979.6	847.0	0.42	0.136 9		0.002 5	0.020 5	0.000 1	0.048 6	0.000 9	131	1	130	2
DPM07-7	479.4	415.2	0.96	0.134 4		0.003 5	0.020 4	0.000 2	0.047 9	0.001 2	130	1	128	3
DPM07-8	423.5	523.5	0.76	0.142 5		0.004 1	0.020 4	0.000 2	0.050 8	0.001 5	130	1	135	4
DPM07-9	549.5	346.8	1.03	0.132 4		0.003 1	0.020 4	0.000 2	0.047 4	0.001 2	130	1	126	3
DPM07-10	452.8	480.1	0.62	0.140 4		0.004 3	0.020 5	0.000 2	0.049 9	0.001 6	131	1	133	4
DPM07-11	174.1	497.5	0.96	0.154 1		0.008 6	0.020 7	0.000 3	0.054 2	0.003 1	132	2	146	2
DPM07-12	170.0	572.5	1.2	0.140 8		0.006 4	0.020 1	0.000 3	0.051 8	0.002 5	128	2	134	2
DPM07-13	253.6	317.3	1.24	0.147 8		0.006 4	0.020 6	0.000 3	0.052 9	0.002 4	132	2	140	4
DPM07-14	255.3	599.7	0.91	0.134 1		0.004 3	0.019 9	0.000 2	0.049 2	0.001 7	127	1	128	4
DPM07-15	455.7	751.5	0.94	0.146 3		0.003 8	0.020 2	0.000 2	0.052 5	0.001 4	129	1	139	3
DPM07-16	252.7	537.0	1.16	0.141 4		0.004 9	0.019 9	0.000 2	0.052 3	0.001 9	127	1	134	4
DPM07-17	488.9	947.6	1.15	0.137 0		0.005 7	0.020 1	0.000 3	0.050 1	0.002 2	128	2	130	3
DPM07-18	315.5	485.3	0.81	0.141 3		0.004 5	0.020 3	0.000 2	0.050 7	0.001 7	130	1	134	4
DPM07-19	393.6	663.2	1.58	0.140 2		0.004 0	0.020 2	0.000 2	0.050 8	0.001 5	129	1	133	4

样品编号	岩性	含量/%
样品编号	岩性	SiO₂		Al₂O₃		FeO		CaO		MgO		K₂O	Na₂O		TiO₂		P₂O₅		MnO		Fe₂O₃
GS2008	似斑状粗粒二长花岗岩	73.19		13.08		0.25		0.63		0.13		5.17	2.89		0.09		0.07		0.09		1.34
GS3070	似斑状粗粒二长花岗岩	73.81		13.13		0.33		1.38		0.15		5.49	2.67		0.07		0.04		0.02		0.93
YPM1GS005	似斑状粗粒二长花岗岩	73.82		12.76		0.10		1.47		0.16		5.04	3.37		0.09		0.05		0.07		1.59
YPM1GS037	似斑状粗粒二长花岗岩	73.86		12.79		0.55		1.49		0.19		5.21	3.01		0.09		0.07		0.03		1.11
YPM1GS069	似斑状粗粒二长花岗岩	74.02		12.49		0.31		1.51		0.20		5.41	2.79		0.06		0.04		0.02		0.93
YPM1GS084	似斑状粗粒二长花岗岩	74.82		12.88		0.89		1.56		0.22		4.76	3.11		0.11		0.08		0.04		1.08
YPM1GS090	似斑状粗粒二长花岗岩	74.84		13.36		0.76		1.64		0.26		5.01	3.16		0.11		0.09		0.05		1.14
YPM2-1\GS2	细粒二长花岗岩	75.08		12.51		0.46		1.69		0.43		5.15	2.89		0.15		0.02		0.02		0.88
YPM2\GS22-1	细粒二长花岗岩	76.01		12.16		0.56		2.16		0.45		5.11	3.06		0.17		0.02		0.02		0.74
YPM2\GS24	细粒二长花岗岩	76.29		11.89		0.58		3.45		0.49		5.27	2.69		0.15		0.03		0.02		0.46
YPM2\GS1	细粒二长花岗岩	76.57		12.33		0.17		3.47		1.58		5.10	3.06		0.19		0.06		0.04		1.21
YPM2\GS3	细粒二长花岗岩	76.77		12.7		1.02		7.31		1.76		4.74	3.07		0.35		0.07		0.05		1.43
样品编号	岩性	相关参数
样品编号	岩性	σ	AR		A/CNK		A/NK		R₁		R₂			DI		Q		An		Ab		Or
GS2008	似斑状粗粒二长花岗岩	1.99	3.19		0.93		1.17		2648.40		438.52			87.57		33.82		7.5		24.81		30.96
GS3070	似斑状粗粒二长花岗岩	2.00	3.44		0.96		1.20		2731.90		412.12			89.58		35.41		6.68		22.79		32.71
YPM1GS005	似斑状粗粒二长花岗岩	2.02	3.55		0.99		1.21		2494.22		407.82			89.68		32.48		4.89		29.05		30.29
YPM1GS037	似斑状粗粒二长花岗岩	2.08	3.57		0.99		1.21		2585.21		421.91			90.62		33.45		6.13		25.88		31.29
YPM1GS069	似斑状粗粒二长花岗岩	2.08	3.62		0.99		1.25		2695.23		409.04			90.91		35.28		5.7		23.97		32.46
YPM1GS084	似斑状粗粒二长花岗岩	2.1	3.7		0.99		1.26		2647.17		506.45			91.03		32.84		7.19		26.46		28.27
YPM1GS090	似斑状粗粒二长花岗岩	2.11	3.83		1.02		1.26		2528.33		452.91			91.71		31.69		7.24		27.03		29.93
YPM2-1\GS2	细粒二长花岗岩	2.12	3.89		1.04		1.26		2792.51		297.01			91.82		38.76		2.12		24.83		30.85
YPM2\GS22-1	细粒二长花岗岩	2.19	4.27		1.05		1.27		2760.37		313.24			94.29		37.59		2.98		26.16		30.54
YPM2\GS24	细粒二长花岗岩	2.21	4.54		1.07		1.5		2894.44		298.45			94.44		40.04		2.53		23.05		31.61
YPM2\GS1	细粒二长花岗岩	2.26	4.56		1.11		1.66		2780.13		282.55			94.70		38.63		1.23		26.14		30.39
YPM2\GS3	细粒二长花岗岩	2.3	4.63		1.12		1.68		2602.24		384.94			95.16		34.62		4.95		26.51		28.55

样品编号	岩性	含量/%
样品编号	岩性	SiO₂		Al₂O₃		FeO		CaO		MgO		K₂O	Na₂O		TiO₂		P₂O₅		MnO		Fe₂O₃
GS2008	似斑状粗粒二长花岗岩	73.19		13.08		0.25		0.63		0.13		5.17	2.89		0.09		0.07		0.09		1.34
GS3070	似斑状粗粒二长花岗岩	73.81		13.13		0.33		1.38		0.15		5.49	2.67		0.07		0.04		0.02		0.93
YPM1GS005	似斑状粗粒二长花岗岩	73.82		12.76		0.10		1.47		0.16		5.04	3.37		0.09		0.05		0.07		1.59
YPM1GS037	似斑状粗粒二长花岗岩	73.86		12.79		0.55		1.49		0.19		5.21	3.01		0.09		0.07		0.03		1.11
YPM1GS069	似斑状粗粒二长花岗岩	74.02		12.49		0.31		1.51		0.20		5.41	2.79		0.06		0.04		0.02		0.93
YPM1GS084	似斑状粗粒二长花岗岩	74.82		12.88		0.89		1.56		0.22		4.76	3.11		0.11		0.08		0.04		1.08
YPM1GS090	似斑状粗粒二长花岗岩	74.84		13.36		0.76		1.64		0.26		5.01	3.16		0.11		0.09		0.05		1.14
YPM2-1\GS2	细粒二长花岗岩	75.08		12.51		0.46		1.69		0.43		5.15	2.89		0.15		0.02		0.02		0.88
YPM2\GS22-1	细粒二长花岗岩	76.01		12.16		0.56		2.16		0.45		5.11	3.06		0.17		0.02		0.02		0.74
YPM2\GS24	细粒二长花岗岩	76.29		11.89		0.58		3.45		0.49		5.27	2.69		0.15		0.03		0.02		0.46
YPM2\GS1	细粒二长花岗岩	76.57		12.33		0.17		3.47		1.58		5.10	3.06		0.19		0.06		0.04		1.21
YPM2\GS3	细粒二长花岗岩	76.77		12.7		1.02		7.31		1.76		4.74	3.07		0.35		0.07		0.05		1.43
样品编号	岩性	相关参数
样品编号	岩性	σ	AR		A/CNK		A/NK		R₁		R₂			DI		Q		An		Ab		Or
GS2008	似斑状粗粒二长花岗岩	1.99	3.19		0.93		1.17		2648.40		438.52			87.57		33.82		7.5		24.81		30.96
GS3070	似斑状粗粒二长花岗岩	2.00	3.44		0.96		1.20		2731.90		412.12			89.58		35.41		6.68		22.79		32.71
YPM1GS005	似斑状粗粒二长花岗岩	2.02	3.55		0.99		1.21		2494.22		407.82			89.68		32.48		4.89		29.05		30.29
YPM1GS037	似斑状粗粒二长花岗岩	2.08	3.57		0.99		1.21		2585.21		421.91			90.62		33.45		6.13		25.88		31.29
YPM1GS069	似斑状粗粒二长花岗岩	2.08	3.62		0.99		1.25		2695.23		409.04			90.91		35.28		5.7		23.97		32.46
YPM1GS084	似斑状粗粒二长花岗岩	2.1	3.7		0.99		1.26		2647.17		506.45			91.03		32.84		7.19		26.46		28.27
YPM1GS090	似斑状粗粒二长花岗岩	2.11	3.83		1.02		1.26		2528.33		452.91			91.71		31.69		7.24		27.03		29.93
YPM2-1\GS2	细粒二长花岗岩	2.12	3.89		1.04		1.26		2792.51		297.01			91.82		38.76		2.12		24.83		30.85
YPM2\GS22-1	细粒二长花岗岩	2.19	4.27		1.05		1.27		2760.37		313.24			94.29		37.59		2.98		26.16		30.54
YPM2\GS24	细粒二长花岗岩	2.21	4.54		1.07		1.5		2894.44		298.45			94.44		40.04		2.53		23.05		31.61
YPM2\GS1	细粒二长花岗岩	2.26	4.56		1.11		1.66		2780.13		282.55			94.70		38.63		1.23		26.14		30.39
YPM2\GS3	细粒二长花岗岩	2.3	4.63		1.12		1.68		2602.24		384.94			95.16		34.62		4.95		26.51		28.55

样品号	岩性	Rb	K	Th	U	Nb	La	Ce	Sr
GS2008	似斑状粗粒二长花岗岩	248.33	42 954.25	39.29	5.61	14.62	43.68	62.89	43.14
GS3070	似斑状粗粒二长花岗岩	308.31	45 598.21	40.26	6.23	15.25	73.79	114.25	49.22
YPM1WL005	似斑状粗粒二长花岗岩	311.34	41 816.14	41.52	6.43	15.51	24.08	93.62	57.21
YPM1WL037	似斑状粗粒二长花岗岩	328.56	43 221.55	46.17	7.05	16.43	39.77	72.4	59.14
YPM1WL069	似斑状粗粒二长花岗岩	337.48	44 864.38	50.83	7.06	17.68	67.78	109.76	67.15
YPM1WL084	似斑状粗粒二长花岗岩	352.43	39 480.15	55.87	7.15	18.14	10.47	72.32	69.22
YPM1WL090	似斑状粗粒二长花岗岩	359.64	41 579.55	57.72	10.73	18.8	30.22	78.31	82.50
YPM2-1\GS2	细粒二长花岗岩	368.13	42 718.49	59.02	12.49	21.92	15.66	19.38	114.20
YPM2-2\GS22-1	细粒二长花岗岩	370.52	42 423.79	62.47	16.89	23.82	65.65	96.74	121.40
YPM2-2\GS24	细粒二长花岗岩	408.83	43 764.45	65.48	18.13	28.46	51.83	89.73	124.44
YPM2-3\GS1	细粒二长花岗岩	415.82	42 311.73	73.83	19.84	33.30	35.95	62.52	377.10
YPM2-3\GS3	细粒二长花岗岩	471.62	39 339.86	78.99	22.85	41.30	146.51	175.91	392.30
样品号	岩性	Nd	P	Hf	Sm	Ti	Y	Yb	Lu
GS2008	似斑状粗粒二长花岗岩	30.61	313.53	4.38	5.82	532.09	29.67	3.30	0.51
GS3070	似斑状粗粒二长花岗岩	32.29	154.52	4.74	6.05	444.69	46.46	6.69	0.94
YPM1WL005	似斑状粗粒二长花岗岩	17.22	222.12	4.98	2.36	533.75	23.64	3.17	0.47
YPM1WL037	似斑状粗粒二长花岗岩	25.64	300.73	5.04	5.20	556.68	63.67	7.81	1.13
YPM1WL069	似斑状粗粒二长花岗岩	35.34	161.82	5.28	6.13	351.31	34.71	4.05	0.62
YPM1WL084	似斑状粗粒二长花岗岩	15.25	370.24	5.32	1.77	647.96	16.11	3.95	0.47
YPM1WL090	似斑状粗粒二长花岗岩	32.57	375.84	5.32	6.66	660.65	36.24	2.39	0.36
YPM2-1\GS2	细粒二长花岗岩	9.5	94.28	5.42	1.50	898.65	14.16	1.22	0.18
YPM2-2\GS22-1	细粒二长花岗岩	39.03	99.95	5.52	5.50	1 003.56	24.14	2.74	0.46
YPM2-2\GS24	细粒二长花岗岩	41.18	126.14	6.34	6.89	918.43	30.88	3.11	0.47
YPM2-3\GS1	细粒二长花岗岩	29.06	249.22	6.36	5.87	1 113.87	35.19	3.29	0.49
YPM2-3\GS3	细粒二长花岗岩	80.18	302.47	6.6	11.37	1 019.15	38.92	2.72	0.38