Geochemistry and Geochronology of Early Cretaceous Granitic Intrusions and Tectonic Setting of Qieqiong Area in Tibet,China

doi:10.19657/j.geoscience.1000-8527.2019.04.02

Abstract

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

CLC Number:

P588.1

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.

Figures/Tables 14

References 28

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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