Geochronology,Geochemistry and Tectonic Implications of Early Neoproterozoic Tuyaodong Intrusive Rocks in the East Kunlun Orogen in Xinjiang

doi:10.19657/j.geoscience.1000-8527.2023.010

Abstract

Abstract:

The western section of the East Kunlun Orogen(EKO) developed Proterozoic granites,and the magmatic timeframe and tectonic setting remain controversial,which restricts our understandings of the Proterozoic EKO tectonic evolution.Here,we investigate the regional tectonic evolution via LA-ICP-MS zircon U-Pb dating and whole-rock elemental analysis of the Tuyaodong granitoids in the western EKO.The monzonite and syenogranite show gneissic structure and have Al-rich minerals such as muscovite.The rocks have high contents of SiO₂(67.37%-76.35%),Al₂O₃(12%-14.25%),and K₂O(1.59%-6.01%),but low TiO₂(0.16%-0.56%),Na₂O(2.13%-3.86%),and CaO(0.9%-4.25%),with average A/CNK=1.02 and A/NK=1.47.The chondrite-normalized REE patterns and primitive mantle-normalized spider-diagram of the monzonite and syenogranite are similar,which are enriched in LREE ((La/Yb)_N=5.04-16.76)and have obvious negative Eu anomaly(average δEu=0.47).The primitive mantle-normalized trace element diagrams show that the rocks are enriched in Rb,K and Th,depleted in Nb,Ba,Sr,P and Ti,and have high CaO/Na₂O ratios(0.35 to 1.41).The zircon ²⁰⁶Pb/²³⁸U weighted average age of the granite is (932.7± 2.4) Ma,indicating that the rock was formed in the Early Neoproterozoic.Comprehensive analysis suggests that the Tuyaodong monzonite and syenogranite belong to S-type and their magmas were originated from melting of clastic sediments with minor muddy components in the upper crust.They may have formed in the same collisional extrusion setting, which is in response to the Rodinia supercontinent assembly in the EKO.

Key words: S-type granite, Neoproterozoic, East Kunlun Orogen, Rodinia super-continent, Tuyaodong

CLC Number:

XI Zhen, MA Decheng, LI Huan, GAO Guangming, XIANG Xianan. Geochronology,Geochemistry and Tectonic Implications of Early Neoproterozoic Tuyaodong Intrusive Rocks in the East Kunlun Orogen in Xinjiang[J]. Geoscience, 2023, 37(06): 1609-1623.

Figures/Tables 13

References 72

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位置	岩性	测试方法	年龄(Ma)	参考文献
莫河下拉	花岗片麻岩	锆石SHRIMP U-Pb	938±5	[17]
莫河下拉	花岗片麻岩	锆石LA-ICP-MS U-Pb	938±2	[17]
夏日哈木	二长花岗岩	锆石LA-ICP-MS U-Pb	920±3	[22]
夏日哈木	二长花岗岩	锆石LA-ICP-MS U-Pb	924±5	[22]
夏日哈木	黑云斜长片麻岩	锆石LA-ICP-MS U-Pb	915±2	[23]
夏日哈木东	副片麻岩	锆石LA-ICP-MS U-Pb	924±73	[24]
夏日哈木东	副片麻岩	锆石LA-ICP-MS U-Pb	909±120	[24]
夏日哈木东	副片麻岩	锆石LA-ICP-MS U-Pb	1067±110	[24]
博卡里克	片麻花岗岩	锆石LA-ICP-MS U-Pb	1006±20	[25]
博卡里克	片麻花岗岩	锆石LA-ICP-MS U-Pb	1002±31	[26]
博卡里克东	片麻状花岗岩	锆石LA-ICP-MS U-Pb	941±13	[26]
喀雅克登塔格	二长岩	锆石SHRIMP U-Pb	1116	[27]
喀雅克登塔格	黑云二长片麻岩	锆石LA-ICP-MS U-Pb	824±3	[12]
大灶火沟	变质碎屑岩	锆石LA-ICP-MS U-Pb	950	[28]
那陵郭勒河	花岗闪长岩	锆石LA-ICP-MS U-Pb	840±2	[18]
那陵郭勒河南	黑云母片岩	锆石LA-ICP-MS U-Pb	970±53	[24]
阿确墩	片麻岩	锆石LA-ICP-MS U-Pb	950	[29]
水泉子沟	叠层石	全岩Sm-Nd	815±26	[30]
拉陵灶火	角闪岩	锆石LA-ICP-MS U-Pb	846±5	[3]
卡尔却卡	二长花岗岩	锆石LA-ICP-MS U-Pb	910±3	[13]
小南川	角闪岩	锆石LA-ICP-MS U-Pb	1123±110	[31]

位置	岩性	测试方法	年龄(Ma)	参考文献
莫河下拉	花岗片麻岩	锆石SHRIMP U-Pb	938±5	[17]
莫河下拉	花岗片麻岩	锆石LA-ICP-MS U-Pb	938±2	[17]
夏日哈木	二长花岗岩	锆石LA-ICP-MS U-Pb	920±3	[22]
夏日哈木	二长花岗岩	锆石LA-ICP-MS U-Pb	924±5	[22]
夏日哈木	黑云斜长片麻岩	锆石LA-ICP-MS U-Pb	915±2	[23]
夏日哈木东	副片麻岩	锆石LA-ICP-MS U-Pb	924±73	[24]
夏日哈木东	副片麻岩	锆石LA-ICP-MS U-Pb	909±120	[24]
夏日哈木东	副片麻岩	锆石LA-ICP-MS U-Pb	1067±110	[24]
博卡里克	片麻花岗岩	锆石LA-ICP-MS U-Pb	1006±20	[25]
博卡里克	片麻花岗岩	锆石LA-ICP-MS U-Pb	1002±31	[26]
博卡里克东	片麻状花岗岩	锆石LA-ICP-MS U-Pb	941±13	[26]
喀雅克登塔格	二长岩	锆石SHRIMP U-Pb	1116	[27]
喀雅克登塔格	黑云二长片麻岩	锆石LA-ICP-MS U-Pb	824±3	[12]
大灶火沟	变质碎屑岩	锆石LA-ICP-MS U-Pb	950	[28]
那陵郭勒河	花岗闪长岩	锆石LA-ICP-MS U-Pb	840±2	[18]
那陵郭勒河南	黑云母片岩	锆石LA-ICP-MS U-Pb	970±53	[24]
阿确墩	片麻岩	锆石LA-ICP-MS U-Pb	950	[29]
水泉子沟	叠层石	全岩Sm-Nd	815±26	[30]
拉陵灶火	角闪岩	锆石LA-ICP-MS U-Pb	846±5	[3]
卡尔却卡	二长花岗岩	锆石LA-ICP-MS U-Pb	910±3	[13]
小南川	角闪岩	锆石LA-ICP-MS U-Pb	1123±110	[31]

测点	含量(10^-6)			Th/U	同位素比值						年龄(Ma)						谐和度 (%)
测点	Pb	Th	U	Th/U	²⁰⁷Pb / ²⁰⁶Pb	1σ	²⁰⁷Pb / ²³⁵U	1σ	²⁰⁶Pb / ²³⁸U	1σ	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ	谐和度 (%)
1	253	463	1638	0.28	0.0714	0.0014	1.4298	0.0317	0.1452	0.0019	969	40.3	901	13.3	874	10.6	96
2	583	1656	2342	0.71	0.1034	0.0025	2.1858	0.0666	0.1516	0.0020	1687	44.8	1177	21.2	910	11.4	74
3	175	178	835	0.21	0.0975	0.0050	2.2061	0.1277	0.1598	0.0018	1577	95.2	1183	40.4	956	10.2	78
4	197	275	1309	0.21	0.0718	0.0012	1.5598	0.0273	0.1575	0.0013	989	33.3	954	10.8	943	7.3	98
5	220	325	1397	0.23	0.0749	0.0012	1.6053	0.0288	0.1550	0.0013	1133	31.9	972	11.3	929	7.1	95
6	434	642	3944	0.16	0.0694	0.0010	1.2490	0.0343	0.1293	0.0026	922	31.5	823	15.5	784	15.1	95
7	93	141	687	0.20	0.0729	0.0012	1.3434	0.0261	0.1331	0.0014	1011	33.3	865	11.3	806	8.1	95
8	238	221	1201	0.18	0.1070	0.0027	2.1456	0.0576	0.1448	0.0015	1750	46.8	1164	18.6	872	8.7	71
9	166	283	1064	0.27	0.0725	0.0019	1.5371	0.0343	0.1508	0.0015	1039	44.1	945	13.7	905	8.4	95
10	162	70	1044	0.07	0.1517	0.0106	3.7773	0.4898	0.1459	0.0081	2365	120.0	1588	104.0	878	45.6	42
11	143	307	804	0.38	0.0707	0.0013	1.5255	0.0308	0.1556	0.0015	950	38.9	941	12.4	932	8.5	99
12	168	245	1173	0.21	0.0682	0.0011	1.4302	0.0240	0.1512	0.0012	876	33.3	902	10.1	908	6.7	99
13	222	275	1182	0.23	0.0691	0.0014	1.5518	0.0227	0.1562	0.0017	949	32.8	951	9.0	952	9.5	97
14	187	242	1190	0.20	0.0766	0.0014	1.6337	0.0320	0.1535	0.0012	1111	37.3	983	12.4	920	6.7	95
15	156	216	1003	0.22	0.0688	0.0013	1.5024	0.0300	0.1572	0.0015	894	39.7	931	12.2	941	8.3	98
16	80	135	486	0.28	0.0702	0.0016	1.5558	0.0366	0.1598	0.0016	933	52.0	953	14.6	956	9.2	99
17	127	269	757	0.36	0.0695	0.0013	1.5084	0.0293	0.1566	0.0017	922	37.0	934	11.9	938	9.6	99
18	272	219	1606	0.14	0.1008	0.0018	1.8289	0.0307	0.1316	0.0015	1639	33.3	1056	11.1	797	8.6	72
19	122	162	805	0.20	0.0681	0.0012	1.5419	0.0291	0.1631	0.0015	870	35.2	947	11.7	974	8.2	97
20	231	259	1925	0.13	0.0691	0.0013	1.3242	0.0283	0.1384	0.0020	902	37.5	856	12.4	835	11.6	97

测点	含量(10^-6)			Th/U	同位素比值						年龄(Ma)						谐和度 (%)
测点	Pb	Th	U	Th/U	²⁰⁷Pb / ²⁰⁶Pb	1σ	²⁰⁷Pb / ²³⁵U	1σ	²⁰⁶Pb / ²³⁸U	1σ	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ	谐和度 (%)
1	253	463	1638	0.28	0.0714	0.0014	1.4298	0.0317	0.1452	0.0019	969	40.3	901	13.3	874	10.6	96
2	583	1656	2342	0.71	0.1034	0.0025	2.1858	0.0666	0.1516	0.0020	1687	44.8	1177	21.2	910	11.4	74
3	175	178	835	0.21	0.0975	0.0050	2.2061	0.1277	0.1598	0.0018	1577	95.2	1183	40.4	956	10.2	78
4	197	275	1309	0.21	0.0718	0.0012	1.5598	0.0273	0.1575	0.0013	989	33.3	954	10.8	943	7.3	98
5	220	325	1397	0.23	0.0749	0.0012	1.6053	0.0288	0.1550	0.0013	1133	31.9	972	11.3	929	7.1	95
6	434	642	3944	0.16	0.0694	0.0010	1.2490	0.0343	0.1293	0.0026	922	31.5	823	15.5	784	15.1	95
7	93	141	687	0.20	0.0729	0.0012	1.3434	0.0261	0.1331	0.0014	1011	33.3	865	11.3	806	8.1	95
8	238	221	1201	0.18	0.1070	0.0027	2.1456	0.0576	0.1448	0.0015	1750	46.8	1164	18.6	872	8.7	71
9	166	283	1064	0.27	0.0725	0.0019	1.5371	0.0343	0.1508	0.0015	1039	44.1	945	13.7	905	8.4	95
10	162	70	1044	0.07	0.1517	0.0106	3.7773	0.4898	0.1459	0.0081	2365	120.0	1588	104.0	878	45.6	42
11	143	307	804	0.38	0.0707	0.0013	1.5255	0.0308	0.1556	0.0015	950	38.9	941	12.4	932	8.5	99
12	168	245	1173	0.21	0.0682	0.0011	1.4302	0.0240	0.1512	0.0012	876	33.3	902	10.1	908	6.7	99
13	222	275	1182	0.23	0.0691	0.0014	1.5518	0.0227	0.1562	0.0017	949	32.8	951	9.0	952	9.5	97
14	187	242	1190	0.20	0.0766	0.0014	1.6337	0.0320	0.1535	0.0012	1111	37.3	983	12.4	920	6.7	95
15	156	216	1003	0.22	0.0688	0.0013	1.5024	0.0300	0.1572	0.0015	894	39.7	931	12.2	941	8.3	98
16	80	135	486	0.28	0.0702	0.0016	1.5558	0.0366	0.1598	0.0016	933	52.0	953	14.6	956	9.2	99
17	127	269	757	0.36	0.0695	0.0013	1.5084	0.0293	0.1566	0.0017	922	37.0	934	11.9	938	9.6	99
18	272	219	1606	0.14	0.1008	0.0018	1.8289	0.0307	0.1316	0.0015	1639	33.3	1056	11.1	797	8.6	72
19	122	162	805	0.20	0.0681	0.0012	1.5419	0.0291	0.1631	0.0015	870	35.2	947	11.7	974	8.2	97
20	231	259	1925	0.13	0.0691	0.0013	1.3242	0.0283	0.1384	0.0020	902	37.5	856	12.4	835	11.6	97

岩性	样品		SiO₂	Fe₂O₃		FeO		Al₂O₃		CaO		MgO		K₂O		Na₂O		MnO	TiO₂			P₂O₅		烧失量			总量
正长花岗岩	TW516		67.37	1.38		4.09		14.25		4.25		2.45		1.59		3.86		0.09	0.56			0.18		1.04			101.10
	TW518		67.64	1.10		3.78		13.91		4.02		1.76		1.90		2.86		0.10	0.55			0.14		0.97			98.72
	TW508		74.20	0.69		1.87		12.93		1.45		0.59		4.86		2.71		0.04	0.31			0.12		0.88			100.65
	TW509		70.04	1.14		3.30		13.07		2.25		1.72		4.23		2.25		0.08	0.52			0.11		2.05			100.76
二长花岗岩	TW317		76.35	0.15		1.59		12.08		0.90		0.53		6.10		2.18		0.03	0.21			0.07		0.34			100.54
	TW501		75.04	0.07		1.89		12.00		1.48		0.69		5.01		2.13		0.03	0.27			0.17		1.73			100.51
	TW519		74.22	0.01		1.58		13.20		1.11		0.32		4.58		3.17		0.04	0.16			0.08		1.79			100.25
	TW618		73.85	0.07		2.36		12.65		1.59		0.40		4.65		2.96		0.05	0.24			0.08		1.53			100.43
	D90		74.61	0.21		1.96		12.35		1.29		0.51		3.67		2.98		0.03	0.19			0.11		2.60			100.51
岩性	样品		A/CNK	A/NK		Mg^#		La		Ce		Pr		Nd		Sm		Eu	Gd			Tb		Dy			Ho
正长花岗岩	TW516		0.90	1.76		45.03		17.8		31.3		4.19		15.9		3.24		0.94	2.74			0.47		2.70			0.54
	TW518		0.99	2.06		39.68		24.1		43.2		6.14		23.6		5.45		0.89	4.89			0.96		5.55			1.13
	TW508		1.05	1.33		29.69		62.4		114.5		14.30		49.4		9.24		1.41	6.77			1.10		5.62			0.98
	TW509		1.05	1.58		41.48		45.5		87.0		10.90		40.8		8.22		1.03	6.63			1.12		5.94			1.11
二长花岗岩	TW317		1.02	1.18		35.39		45.5		93.2		11.40		41.3		9.43		0.72	7.96			1.32		6.15			0.96
	TW501		1.03	1.34		38.64		53.8		104.6		12.90		48.0		9.46		1.67	7.28			1.16		5.42			0.93
	TW519		1.08	1.30		26.42		19.4		36.2		4.77		17.2		4.25		0.40	3.54			0.71		3.78			0.65
	TW618		0.99	1.28		22.74		49.5		92.7		11.00		38.5		7.29		0.84	5.71			1.00		5.68			1.09
	D90		1.10	1.39		29.73		12.7		23.7		3.35		12.5		3.32		0.33	3.07			0.66		3.52			0.56
岩性	样品		Er	Tm		Yb		Lu		Y		Rb		Ba		Th		K		Sr			P		Hf			Zr
正长花岗岩	TW516		1.48	0.24		1.53		0.24		14.8		92.9		324.0		5.3		13481.9		313.6			755.1		4.7			163.6
	TW518		3.29	0.54		3.43		0.54		30.5		162.7		256.6		9.5		15433.1		245.4			576.3		5.1			156.7
	TW508		2.56	0.41		2.67		0.41		25.5		193.8		796.6		19.3		39128.1		209.0			493.6		5.4			182.0
	TW509		2.89	0.48		3.05		0.46		30.2		262.8		457.1		27.1		33230.8		149.5			442.0		6.1			169.7
二长花岗岩	TW317		2.27	0.35		2.07		0.30		27.2		296.3		421.6		29.5		50132.8		140.9			352.8		5.1			132.6
	TW501		2.40	0.38		2.35		0.39		24.5		162.7		1036.0		18.1		40122.8		207.0			708.0		11.0			342.6
	TW519		1.62	0.28		1.76		0.27		19.2		322.7		199.1		14.6		38238.4		71.1			364.6		3.0			70.0
	TW618		3.04	0.53		3.35		0.53		31.7		287.7		576.3		25.5		34872.0		161.1			317.7		5.8			179.8
	D90		1.30	0.21		1.21		0.18		17.1		480.8		219.4		10.3		40053.4		52.9			788.9		3.0			75.8
岩性	样品	Ti			Nb		Sc		Cr		ΣREE		LREE		HREE		(La/Yb)_N				(Ce/Yb)_N					δEu			δCe
正长花岗岩	TW516	3555.3			6.6		11.20		8.7		83.31		73.37		9.94		8.35				5.68					0.94			0.86
	TW518	3585.2			12.0		12.50		23.20		123.71		103.38		20.33		5.04				3.50					0.52			0.85
	TW508	1632.2			15.1		4.67		5.87		271.77		251.25		20.52		16.76				11.91					0.52			0.90
	TW509	3055.6			20.0		9.29		4.90		215.13		193.45		21.68		10.70				7.92					0.41			0.93
二长花岗岩	TW317	965.7			19.6		3.18		8.24		222.93		201.55		21.38		15.77				12.51					0.25			0.98
	TW501	1355.0			10.2		4.74		8.17		250.74		230.43		20.31		16.42				12.36					0.59			0.94
	TW519	534.2			15.4		3.20		6.32		94.83		82.22		12.61		07.91				05.71					0.31			0.90
	TW618	1233.9			19.0		3.55		7.47		220.76		199.83		20.93		10.60				07.69					0.38			0.93
	D90	622.2			20.6		2.97		6.83		66.61		55.90		10.71		07.53				05.44					0.31			0.87