Geochronological and Geochemical Characteristics of Tuanbaoshan Granite Pluton in Qinghai and Geological Implications

doi:10.19657/j.geoscience.1000-8527.2020.069

Abstract

Abstract:

The Tuanbaoshan granite pluton is located in the eastern South Qilian, and is emplaced into the Paleoproterozoic epimetamorphic rocks. Samples from the granite pluton are LA-ICP-MS zircon U-Pb dated and geochemically analyzed to constrain its emplacement age, petrogenesis and tectonic setting. The zircon U-Pb dating yielded weighted mean age of (776±8) Ma. The rocks contain relatively contents of SiO₂, Al₂O₃ and K₂O, and relatively low contents of FeO^T, MgO and CaO, with K₂O/Na₂O>1. The Tuanbaoshan granites are enriched in Rb, Th, and depleted in Ba and Zr, with chondrite-normalized LREE-enriched patterns. Based on these characteristics, we suggest that: the Tuanbaoshan granites are calc-alkalic highly-differentiated S-type, and were emplaced in a Late Proterozoic continent-continent collision setting. Source rocks of the Tuanbaoshan granites may have been argillaceous sandstone or graywacke, and the pluton may have subsequently experienced two magmatic events during the end of Jinning movement and the Mid Caledonian movement.

Key words: granite, Late Proterozoic, syn-collision, Tuanbaoshan, Qinghai

CLC Number:

P588.1

ZHANG Baotao, HU Zhaoguo, JIANG Xiaoping, WANG Xiangwei, SUN Luwei, ZHANG Yang, WANG Xiaoyu, ZHAO Xiaobo, GUO Wei. Geochronological and Geochemical Characteristics of Tuanbaoshan Granite Pluton in Qinghai and Geological Implications[J]. Geoscience, 2021, 35(02): 504-513.

Figures/Tables 10

References 40

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点号	同位素比值						相关度	年龄/Ma
点号	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ	相关度	²³⁸U/ ²³²Th	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ
1	0.063	0.002	1.115	0.041	0.128	0.002	0.49	0.92	718	78	760	20	774	13
2	0.066	0.002	1.165	0.038	0.128	0.002	0.54	0.80	806	64	785	18	779	13
3	0.086	0.002	1.109	0.038	0.092	0.002	0.57	19.33	1 344	48	758	18	566	11
4	0.072	0.002	1.280	0.033	0.128	0.002	0.55	1.89	991	50	837	15	775	10
5	0.065	0.001	1.104	0.025	0.122	0.002	0.6	1.37	776	46	755	12	742	10
6	0.062	0.002	1.112	0.034	0.128	0.002	0.61	1.12	687	54	759	16	775	14
7	0.066	0.003	1.169	0.046	0.128	0.004	0.70	0.84	809	91	786	21	774	20
8	0.116	0.003	2.061	0.085	0.127	0.004	0.81	2.96	1 894	43	1 136	28	772	24
9	0.134	0.003	1.730	0.060	0.092	0.002	0.76	1.76	2 152	43	1 020	22	570	14
10	0.152	0.003	4.957	0.162	0.233	0.006	0.78	2.75	2 366	32	1 812	28	1 352	31
11	0.067	0.003	1.200	0.066	0.128	0.003	0.42	1.23	844	101	801	31	777	17
12	0.094	0.004	0.947	0.038	0.073	0.001	0.50	1.58	1 517	75	677	20	451	9
13	0.085	0.003	1.463	0.036	0.128	0.002	0.58	4.35	1 322	73	915	15	775	11
14	0.069	0.005	1.221	0.086	0.129	0.003	0.36	1.93	894	150	810	40	781	19
15	0.070	0.002	1.244	0.044	0.129	0.003	0.68	0.52	939	69	821	20	779	18
16	0.066	0.002	1.169	0.039	0.128	0.004	0.82	2.43	813	59	786	18	778	20
17	0.111	0.006	1.996	0.127	0.129	0.003	0.34	0.66	1 809	99	1 114	43	780	16
18	0.181	0.019	2.678	0.364	0.093	0.004	0.28	5.61	2 665	172	1 322	101	571	21

点号	同位素比值						相关度	年龄/Ma
点号	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ	相关度	²³⁸U/ ²³²Th	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ
1	0.063	0.002	1.115	0.041	0.128	0.002	0.49	0.92	718	78	760	20	774	13
2	0.066	0.002	1.165	0.038	0.128	0.002	0.54	0.80	806	64	785	18	779	13
3	0.086	0.002	1.109	0.038	0.092	0.002	0.57	19.33	1 344	48	758	18	566	11
4	0.072	0.002	1.280	0.033	0.128	0.002	0.55	1.89	991	50	837	15	775	10
5	0.065	0.001	1.104	0.025	0.122	0.002	0.6	1.37	776	46	755	12	742	10
6	0.062	0.002	1.112	0.034	0.128	0.002	0.61	1.12	687	54	759	16	775	14
7	0.066	0.003	1.169	0.046	0.128	0.004	0.70	0.84	809	91	786	21	774	20
8	0.116	0.003	2.061	0.085	0.127	0.004	0.81	2.96	1 894	43	1 136	28	772	24
9	0.134	0.003	1.730	0.060	0.092	0.002	0.76	1.76	2 152	43	1 020	22	570	14
10	0.152	0.003	4.957	0.162	0.233	0.006	0.78	2.75	2 366	32	1 812	28	1 352	31
11	0.067	0.003	1.200	0.066	0.128	0.003	0.42	1.23	844	101	801	31	777	17
12	0.094	0.004	0.947	0.038	0.073	0.001	0.50	1.58	1 517	75	677	20	451	9
13	0.085	0.003	1.463	0.036	0.128	0.002	0.58	4.35	1 322	73	915	15	775	11
14	0.069	0.005	1.221	0.086	0.129	0.003	0.36	1.93	894	150	810	40	781	19
15	0.070	0.002	1.244	0.044	0.129	0.003	0.68	0.52	939	69	821	20	779	18
16	0.066	0.002	1.169	0.039	0.128	0.004	0.82	2.43	813	59	786	18	778	20
17	0.111	0.006	1.996	0.127	0.129	0.003	0.34	0.66	1 809	99	1 114	43	780	16
18	0.181	0.019	2.678	0.364	0.093	0.004	0.28	5.61	2 665	172	1 322	101	571	21

样号	SiO₂		Al₂O₃		Fe₂O₃		FeO		MgO		CaO		Na₂O			K₂O		TiO₂		P₂O₅		MnO		Na₂O+ K₂O
HF-1	74.33		13.81		1.73		1.45		0.24		0.80		3.42			4.99		0.07		0.15		0.05		8.41
HF-2	72.93		13.30		2.05		1.69		0.30		1.41		3.17			5.65		0.14		0.08		0.04		8.82
HF-3	74.14		13.81		1.76		1.47		0.21		0.91		3.29			5.14		0.08		0.06		0.04		8.43
HF-4	74.11		13.72		1.75		1.59		0.19		0.93		3.21			4.72		0.07		0.14		0.05		7.93
HF-5	74.55		13.59		1.45		1.21		0.15		0.47		4.71			4.46		0.03		0.28		0.13		9.17
HF-6	73.18		13.41		2.31		1.69		0.38		0.83		2.84			6.11		0.19		0.11		0.04		8.95
样号	里特曼指数		A/NK		A/CNK		FeO^T		固结指数 (SI)		碱度率 (AR)		La			Ce		Pr		Nd		Sm		Eu
HF-1	2.27		1.64		1.50		2.98		2.03		3.71		11.74			30.61		3.15		10.20		2.72		0.39
HF-2	2.61		1.51		1.30		3.51		2.33		3.99		28.73			78.80		8.23		26.65		5.54		0.62
HF-3	2.29		1.64		1.48		3.03		1.73		3.68		17.34			39.22		4.16		13.50		2.61		0.44
HF-4	2.02		1.73		1.55		3.16		1.64		3.36		10.44			25.05		2.69		9.15		1.96		0.46
HF-5	2.68		1.48		1.41		2.49		1.25		4.75		2.07			4.74		0.57		2.00		0.60		0.14
HF-6	2.67		1.50		1.37		3.73		2.85		4.38		35.09			98.49		10.46		34.97		7.63		0.70
样号	Gd		Tb		Dy		Ho		Er		Tm		Yb			Lu		δEu		δCe		(Sm/ Nd)_N		LREE
HF-1	2.97		0.54		3.27		0.61		1.75		0.25		1.83			0.25		2.72		1.19		0.82		137.83
HF-2	5.15		0.70		3.55		0.65		1.79		0.26		1.80			0.25		5.54		1.22		0.64		338.93
HF-3	2.63		0.41		2.40		0.46		1.34		0.21		1.37			0.20		2.61		1.08		0.59		180.41
HF-4	2.11		0.38		2.27		0.43		1.22		0.19		1.18			0.17		1.96		1.11		0.66		118.28
HF-5	0.69		0.13		0.73		0.11		0.32		0.05		0.41			0.06		0.60		1.03		0.93		25.52
HF-6	6.63		0.84		3.89		0.66		1.76		0.24		1.57			0.21		7.63		1.23		0.67		427.67
样号	δCe	(Sm/ Nd)_N		HREE		REE		LREE/ HREE		(La/ Yb)_N		Rb		Ba	Th		Ta		Hf		Zr		Sr		Y
HF-1	1.19	0.82		73.95		211.78		1.86		4.34		292		373	25.20		3.00		3.23		99.10		82.50		23.60
HF-2	1.22	0.64		87.41		426.34		3.88		10.76		304		185	9.23		4.04		2.33		41.60		44.00		16.50
HF-3	1.08	0.59		58.30		238.71		3.09		8.55		163		217	13.43		3.39		4.46		62.13		63.84		—
HF-4	1.11	0.66		51.58		169.87		2.29		5.94		211		320	9.48		3.13		3.57		59.47		58.55		—
HF-5	1.03	0.93		16.14		41.66		1.58		3.38		281		29	0.94		5.06		2.54		12.30		13.00		6.02
HF-6	1.23	0.67		94.24		521.91		4.54		15.05		359		331	28.60		3.23		2.64		128.00		81.70		21.40
HF-7	—	—		—		—		—		—		211		817	20.40		2.02		4.09		211.00		125.00		24.10

样号	SiO₂		Al₂O₃		Fe₂O₃		FeO		MgO		CaO		Na₂O			K₂O		TiO₂		P₂O₅		MnO		Na₂O+ K₂O
HF-1	74.33		13.81		1.73		1.45		0.24		0.80		3.42			4.99		0.07		0.15		0.05		8.41
HF-2	72.93		13.30		2.05		1.69		0.30		1.41		3.17			5.65		0.14		0.08		0.04		8.82
HF-3	74.14		13.81		1.76		1.47		0.21		0.91		3.29			5.14		0.08		0.06		0.04		8.43
HF-4	74.11		13.72		1.75		1.59		0.19		0.93		3.21			4.72		0.07		0.14		0.05		7.93
HF-5	74.55		13.59		1.45		1.21		0.15		0.47		4.71			4.46		0.03		0.28		0.13		9.17
HF-6	73.18		13.41		2.31		1.69		0.38		0.83		2.84			6.11		0.19		0.11		0.04		8.95
样号	里特曼指数		A/NK		A/CNK		FeO^T		固结指数 (SI)		碱度率 (AR)		La			Ce		Pr		Nd		Sm		Eu
HF-1	2.27		1.64		1.50		2.98		2.03		3.71		11.74			30.61		3.15		10.20		2.72		0.39
HF-2	2.61		1.51		1.30		3.51		2.33		3.99		28.73			78.80		8.23		26.65		5.54		0.62
HF-3	2.29		1.64		1.48		3.03		1.73		3.68		17.34			39.22		4.16		13.50		2.61		0.44
HF-4	2.02		1.73		1.55		3.16		1.64		3.36		10.44			25.05		2.69		9.15		1.96		0.46
HF-5	2.68		1.48		1.41		2.49		1.25		4.75		2.07			4.74		0.57		2.00		0.60		0.14
HF-6	2.67		1.50		1.37		3.73		2.85		4.38		35.09			98.49		10.46		34.97		7.63		0.70
样号	Gd		Tb		Dy		Ho		Er		Tm		Yb			Lu		δEu		δCe		(Sm/ Nd)_N		LREE
HF-1	2.97		0.54		3.27		0.61		1.75		0.25		1.83			0.25		2.72		1.19		0.82		137.83
HF-2	5.15		0.70		3.55		0.65		1.79		0.26		1.80			0.25		5.54		1.22		0.64		338.93
HF-3	2.63		0.41		2.40		0.46		1.34		0.21		1.37			0.20		2.61		1.08		0.59		180.41
HF-4	2.11		0.38		2.27		0.43		1.22		0.19		1.18			0.17		1.96		1.11		0.66		118.28
HF-5	0.69		0.13		0.73		0.11		0.32		0.05		0.41			0.06		0.60		1.03		0.93		25.52
HF-6	6.63		0.84		3.89		0.66		1.76		0.24		1.57			0.21		7.63		1.23		0.67		427.67
样号	δCe	(Sm/ Nd)_N		HREE		REE		LREE/ HREE		(La/ Yb)_N		Rb		Ba	Th		Ta		Hf		Zr		Sr		Y
HF-1	1.19	0.82		73.95		211.78		1.86		4.34		292		373	25.20		3.00		3.23		99.10		82.50		23.60
HF-2	1.22	0.64		87.41		426.34		3.88		10.76		304		185	9.23		4.04		2.33		41.60		44.00		16.50
HF-3	1.08	0.59		58.30		238.71		3.09		8.55		163		217	13.43		3.39		4.46		62.13		63.84		—
HF-4	1.11	0.66		51.58		169.87		2.29		5.94		211		320	9.48		3.13		3.57		59.47		58.55		—
HF-5	1.03	0.93		16.14		41.66		1.58		3.38		281		29	0.94		5.06		2.54		12.30		13.00		6.02
HF-6	1.23	0.67		94.24		521.91		4.54		15.05		359		331	28.60		3.23		2.64		128.00		81.70		21.40
HF-7	—	—		—		—		—		—		211		817	20.40		2.02		4.09		211.00		125.00		24.10