辽东桓仁西部古元古代侵入岩年代学及岩石地球化学

doi:10.19657/j.geoscience.1000-8527.2019.01.10

摘要/Abstract

摘要：

华北克拉通东部辽东地区出露古元古代侵入岩,为准确认识辽东地区古元古代构造演化过程,选取北沟岩体、正岔岩体和树柳林子岩体的岩相学、岩石地球化学及年代学特征,探讨了岩体的形成时代、岩石成因及其构造环境。锆石SHRIMP U-Pb年代学研究表明,柳林子岩体年龄为(2 490±8) Ma,北沟岩体年龄为(2 457±11) Ma。北沟岩体高硅富钾,富集Rb、U、Th、K等大离子亲石元素,亏损Nb、Ti、P等高场强元素,为过铝质高钾钙碱性I型花岗岩,Nb/Ta平均值5.75,Rb/Nb平均值4.21,源于太古宙古老地壳的部分熔融;正岔岩体高硅富钾,富集Rb、Ba、U、Th、K等大离子亲石元素,亏损Nb、Ti、P等高场强元素,为弱过铝质高钾钙碱性A型花岗岩,Nb/Ta平均值16.06,Rb/Nb平均值4.81,源区可能由幔源岩浆底侵带来的热量加热地壳,导致其重熔并与之混合后形成的。柳林子岩体为变质角闪辉长岩,呈亚碱性,富集Rb、Ba、K等大离子亲石元素,亏损Nb、Ti、P等高场强元素,显示其岩浆可能形成于受陆壳微弱混染的软流圈地幔或岩石圈地幔。认为研究区古元古代侵入岩形成于东、西陆块碰撞拼合后的后造山挤压向板内伸展转换的构造环境,为构造体质转换的产物。

关键词: 辽东地区, 古元古代, 侵入岩, 锆石SHRIMP U-Pb定年, 地球化学, 构造背景

Abstract:

Paleoproterozoic intrusive rocks are widespread in the Eastern Liaoning Province (ELP), which is located in the eastern North China Craton (NCC). This paper reported the petrography, geochemistry and geochronology of the Beigou, Zhengcha and Liulinzi plutons in the Kaiyuan area of the eastern part of the northern NCC margin. We discussed the formation age, petrogenesis and tectonic environment of these plutons. Zircon U-Pb dating shows that both the Liulinzi (2,490±8 Ma) and Beigou (2,457±11 Ma) plutons were formed in the Early Paleoproterozoic. The Beigou intrusive rocks have higher SiO₂ and K₂O contents, and are enriched in large ion lithophile elements (LILEs, e.g., Rb, K, U and Th) but depleted in high field strength elements (HFSEs, e.g., P, Nb and Ti), with Nb/Ta=5.75 and Rb/Nb=4.21. These features indicate that the Beigou pluton is metaluminous calc-alkaline I-type granite, which was likely originated from the partial melting of lower crust. The Zhengcha pluton samples have higher SiO₂ and K₂O contents. They are also enriched in LILEs and depleted in HFSEs, with Nb/Ta=16.06 and Rb/Nb=4.81. These features indicate that the Zhengcha pluton is metaluminous calc-alkaline A-type granite, which was most likely originated from the partial melting of lower crust with minor mantle-derived input. The Liulinzi meta-gabbro is sub-alkaline, enriched in LILEs and depleted in HFSEs, indicating that the magma may have derived from the depleted mantle with crustal contamination in an intracontinental extension setting. Combined with previous studies, magmatic rocks of the study area may have formed under a compressional to extensional tectonic transition regime after the collision between the Eastern block and the Western block of the NCC.

Key words: eastern Liaoning Province(ELP), Paleoproterozoic, intrusive rock, zircon SHRIMP U-Pb dating, geochemistry, tectonic setting

中图分类号:

P588.1

骆念岗, 王彬娜, 刘显成, 洪秀伟, 于波涛, 李庆. 辽东桓仁西部古元古代侵入岩年代学及岩石地球化学[J]. 现代地质, 2019, 33(01): 98-111.

LUO Niangang, WANG Binna, LIU Xiancheng, HONG Xiuwei, YU Botao, LI Qing. Geochronology and Geochemistry of Paleoproterozoic Intrusive Rocks in Western Huanren Area, Eastern Liaoning Province[J]. Geoscience, 2019, 33(01): 98-111.

图/表 13

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测点号	w_B/%		w_B/10^-6		Th/U	同位素比值							同位素年龄/Ma						同位素年龄不一致性 /%
测点号	²⁰⁶Pb		U	Th	Th/U	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ		²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁶Pb/ ²³⁸U		1σ		同位素年龄不一致性 /%
PP18TW1-1.1	0.56	46		53	1.20	0.187 9	0.007 6	12.22	0.019	0.484 2	0.014	2 680		20.0		2 545		30		5
PP18TW1-2.1	0.10	191		114	0.61	0.164 5	0.003 9	10.64	0.012	0.472 0	0.011	2 493		7.5		2 492		22		0
PP18TW1-3.1	0.12	222		151	0.70	0.164 4	0.003 5	10.38	0.011	0.461 2	0.010	2 490		6.5		2 445		21		2
PP18TW1-4.1	0.06	489		250	0.53	0.161 1	0.002 5	8.529	0.011	0.385 1	0.011	2 462		4.6		2 100		19		15
PP18TW1-5.1	0.28	108		52	0.49	0.166 1	0.005 1	10.33	0.015	0.457 8	0.013	2 493		11.0		2 430		27		3
PP18TW1-7.1	0.25	131		95	0.75	0.164 6	0.004 6	9.13	0.012	0.407 7	0.011	2 480		9.7		2 204		20		11
PP14TW3-1.1	2.90	89		66	0.74	0.193 5	0.006 4	11.44	0.026	0.495 2	0.020	2 534		27.0		2 593		42		-2
PP14TW3-2.1	0.07	689		124	0.18	0.160 8	0.005 1	10.35	0.019	0.468 7	0.019	2 457		8.8		2 478		39		-1
PP14TW3-3.1	0.11	1 312		223	0.17	0.161 5	0.003 8	9.24	0.020	0.417 7	0.019	2 461		7.0		2 250		37		9
PP14TW3-4.1	0.10	790		324	0.41	0.161 5	0.006 1	9.30	0.020	0.420 6	0.019	2 460		12.0		2 263		37		8
PP14TW3-4.2	0.32	58		32	0.55	0.162 3	0.008 4	10.48	0.023	0.476 8	0.021	2 450		17.0		2 513		43		-3
PP14TW3-5.1	0.12	44		35	0.79	0.164 6	0.007 2	11.01	0.021	0.488 4	0.020	2 492		12.0		2 564		42		-3
PP14TW3-6.1	0.10	979		235	0.24	0.159 9	0.004 9	9.03	0.020	0.411 6	0.019	2 446		8.8		2 222		35		9
PP14TW3-7.1	0.12	188		124	0.66	0.164 9	0.006 4	10.36	0.021	0.458 6	0.020	2 495		13.0		2 434		40		2
PP14TW3-8.1	0.12	231		81	0.35	0.158 6	0.004 7	8.71	0.020	0.400 9	0.019	2 430		8.6		2 173		35		11
PP14TW3-9.1	0.23	113		72	0.64	0.165 8	0.006 3	11.42	0.021	0.506	0.020	2 495		12.0		2 639		43		-6
PP14TW13-10.1	0.07	346		83	0.24	0.158 6	0.005 0	8.88	0.021	0.407 4	0.021	2 435		8.5		2 203		38		10
PP14TW3-11.1	0.05	2 025		324	0.16	0.160 3	0.004 1	8.97	0.019	0.407 4	0.019	2 453		7.1		2 203		35		10
PP14TW3-12.1	0.70	442		234	0.53	0.176 2	0.029 0	10.71	0.036	0.457 1	0.019	2 557		51.0		2 427		39		5
PP14TW3-12.2	0.21	1 135		454	0.40	0.160 6	0.007 4	8.40	0.021	0.384 0	0.020	2 442		14.0		2 095		35		14
PP14TW3-13.1	0.46	1 538		123	0.08	0.148 5	0.004 4	5.63	0.019	0.282 8	0.019	2 281		10.0		1 606		26		30
PP14TW3-13.2	0.37	315		123	0.39	0.162 7	0.004 8	8.75	0.021	0.398 3	0.020	2 449		10.0		2 161		37		12
PP14TW3-14.1	0.09	1 820		364	0.20	0.163 3	0.005 1	10.39	0.020	0.463 6	0.019	2 482		9.8		2 455		39		1
PP14TW3-15.1	0.08	439		351	0.80	0.165 9	0.006 3	11.35	0.024	0.498	0.023	2 509		11.0		2 606		50		-4

测点号	w_B/%		w_B/10^-6		Th/U	同位素比值							同位素年龄/Ma						同位素年龄不一致性 /%
测点号	²⁰⁶Pb		U	Th	Th/U	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ		²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁶Pb/ ²³⁸U		1σ		同位素年龄不一致性 /%
PP18TW1-1.1	0.56	46		53	1.20	0.187 9	0.007 6	12.22	0.019	0.484 2	0.014	2 680		20.0		2 545		30		5
PP18TW1-2.1	0.10	191		114	0.61	0.164 5	0.003 9	10.64	0.012	0.472 0	0.011	2 493		7.5		2 492		22		0
PP18TW1-3.1	0.12	222		151	0.70	0.164 4	0.003 5	10.38	0.011	0.461 2	0.010	2 490		6.5		2 445		21		2
PP18TW1-4.1	0.06	489		250	0.53	0.161 1	0.002 5	8.529	0.011	0.385 1	0.011	2 462		4.6		2 100		19		15
PP18TW1-5.1	0.28	108		52	0.49	0.166 1	0.005 1	10.33	0.015	0.457 8	0.013	2 493		11.0		2 430		27		3
PP18TW1-7.1	0.25	131		95	0.75	0.164 6	0.004 6	9.13	0.012	0.407 7	0.011	2 480		9.7		2 204		20		11
PP14TW3-1.1	2.90	89		66	0.74	0.193 5	0.006 4	11.44	0.026	0.495 2	0.020	2 534		27.0		2 593		42		-2
PP14TW3-2.1	0.07	689		124	0.18	0.160 8	0.005 1	10.35	0.019	0.468 7	0.019	2 457		8.8		2 478		39		-1
PP14TW3-3.1	0.11	1 312		223	0.17	0.161 5	0.003 8	9.24	0.020	0.417 7	0.019	2 461		7.0		2 250		37		9
PP14TW3-4.1	0.10	790		324	0.41	0.161 5	0.006 1	9.30	0.020	0.420 6	0.019	2 460		12.0		2 263		37		8
PP14TW3-4.2	0.32	58		32	0.55	0.162 3	0.008 4	10.48	0.023	0.476 8	0.021	2 450		17.0		2 513		43		-3
PP14TW3-5.1	0.12	44		35	0.79	0.164 6	0.007 2	11.01	0.021	0.488 4	0.020	2 492		12.0		2 564		42		-3
PP14TW3-6.1	0.10	979		235	0.24	0.159 9	0.004 9	9.03	0.020	0.411 6	0.019	2 446		8.8		2 222		35		9
PP14TW3-7.1	0.12	188		124	0.66	0.164 9	0.006 4	10.36	0.021	0.458 6	0.020	2 495		13.0		2 434		40		2
PP14TW3-8.1	0.12	231		81	0.35	0.158 6	0.004 7	8.71	0.020	0.400 9	0.019	2 430		8.6		2 173		35		11
PP14TW3-9.1	0.23	113		72	0.64	0.165 8	0.006 3	11.42	0.021	0.506	0.020	2 495		12.0		2 639		43		-6
PP14TW13-10.1	0.07	346		83	0.24	0.158 6	0.005 0	8.88	0.021	0.407 4	0.021	2 435		8.5		2 203		38		10
PP14TW3-11.1	0.05	2 025		324	0.16	0.160 3	0.004 1	8.97	0.019	0.407 4	0.019	2 453		7.1		2 203		35		10
PP14TW3-12.1	0.70	442		234	0.53	0.176 2	0.029 0	10.71	0.036	0.457 1	0.019	2 557		51.0		2 427		39		5
PP14TW3-12.2	0.21	1 135		454	0.40	0.160 6	0.007 4	8.40	0.021	0.384 0	0.020	2 442		14.0		2 095		35		14
PP14TW3-13.1	0.46	1 538		123	0.08	0.148 5	0.004 4	5.63	0.019	0.282 8	0.019	2 281		10.0		1 606		26		30
PP14TW3-13.2	0.37	315		123	0.39	0.162 7	0.004 8	8.75	0.021	0.398 3	0.020	2 449		10.0		2 161		37		12
PP14TW3-14.1	0.09	1 820		364	0.20	0.163 3	0.005 1	10.39	0.020	0.463 6	0.019	2 482		9.8		2 455		39		1
PP14TW3-15.1	0.08	439		351	0.80	0.165 9	0.006 3	11.35	0.024	0.498	0.023	2 509		11.0		2 606		50		-4

取样位置		样品号			SiO₂			TiO₂					Al₂O₃			Fe₂O₃				FeO				MnO			MgO					CaO			Na₂O			K₂O				P₂O₅				烧失量
北沟岩体		P14S3			78.90			0.15					11.08			1.31				0.18				0.014			0.22					0.15			0.98			5.5				0.04				0.77
		P14S9			75.16			0.21					11.68			3.29				1.22				0.170			0.56					0.70			1.52			5.44				0.06				0.58
		P14S10			76.69			0.19					11.48			2.53				0.75				0.110			0.43					0.48			1.45			5.37				0.05				0.61
正岔岩体		PP23S1			75.76			0.2					13.12			0.49				0.54				0.068			0.14					0.22			3.86			5.64				0.05				0.31
正岔岩体		PP23S2			75.35			0.31					13.45			0.67				0.36				0.042			0.13					0.54			4.12			5.29				0.04				0.24
柳林子岩体		PP18S1			47.96			1.32					13.49			2.37				10.35				0.190			8.27					10.29			2.34			0.57				0.10				2.51
柳林子岩体		PP18S2			46.83			1.17					13.07			1.98				9.82				0.170			7.97					10.03			1.83			0.49				0.15				2.26
取样位置	样品号			La		Ce			Pr			Nd			Sm				Eu		Gd				Tb			Dy			Ho			Er			Tm				Yb		Lu				Y
北沟岩体	P14S3			3.87		8.27			1.062			5.22			1.33				0.40		1.54				0.30			1.61			0.34			0.74			0.14				1.01		0.14				9.07
	P14S9			16.08		40.25			3.642			13.69			2.41				0.36		2.45				0.49			3.30			0.78			2.57			0.49				3.53		0.50				21.95
	P14S10			9.97		24.26			2.352			9.45			1.87				0.38		2.00				0.39			2.46			0.56			1.66			0.32				2.27		0.32				15.51
正岔岩体	PP23S1			74.86		145.8			16.76			64.96			10.30				2.24		8.27				1.09			5.56			1.05			2.72			0.41				2.29		0.39				27.90
正岔岩体	PP23S2			73.54		123.5			12.57			67.34			9.45				2.05		6.34				1.43			5.23			0.86			1.87			0.35				2.45		0.32				23.43
柳林子岩体	PP18S1			9.132		21.98			3.098			15.13			3.68				1.20		4.37				0.72			4.26			0.90			2.35			0.36				1.99		0.35				19.93
柳林子岩体	PP18S2			12.32		23.34			3.430			16.43			4.32				1.17		5.02				0.98			3.94			0.92			2.43			0.33				1.34		0.25				16.34
取样位置	样品号			Cr			Co			Ni				Ga			Th			Rb			Sr			Zr			Nb				Cs			Ba				Hf				Ta				U
北沟岩体	P14S3			292.50			48.01			125.80				11.28			0.83			17.97			224.2			18.69			2.11				0.74			76.17				0.69				1.97				0.17
	P14S9			6.35			3.07			4.39				10.15			5.53			19.71			70.6			240.5			11.51				18.44			108.90				7.25				0.97				1.05
	P14S10			200.20			27.90			78.40				11.07			3.25			18.26			116.3			158.6			7.45				9.56			87.39				4.36				1.72				0.74
正岔岩体	PP23S1			31.12			12.3			20.89				63.88			16.2			122.5			500.9			207.9			25.39				0.69			1 740.5				4.81				1.86				2.27
正岔岩体	PP23S2			19.52			11.4			16.32				45.22			15.7			108.2			402.3			187.4			22.53				0.45			1 802.1				4.02				1.23				2.06
柳林子岩体	PP18S1			69.81			61.53			100.40				21.27			1.09			41.15			272.4			83.0			6.93				0.71			157.6				2.78				0.49				0.37
柳林子岩体	PP18S2			61.12			56.23			76.43				34.76			0.93			34.87			301.2			73.3			5.93				0.62			134.79				3.34				0.83				0.43
取样位置			样品号				σ₄₃				A/CNK							ΣREE				LREE/HREE								(La/Yb)_N									δEu						δCe
北沟岩体			P14S3				1.13				1.067							26.03				3.44								2.73									0.87						0.98
			P14S9				1.51				0.984							90.60				5.40								3.26									0.45						1.24
			P14S10				1.38				1.018							58.32				4.83								3.15									0.61						1.19
正岔岩体			PP23S1				2.76				1.021							336.75				14.43								23.41									0.72						0.97
正岔岩体			PP23S2				2.75				0.997							307.30				15.30								21.53									0.76						0.91
柳林子岩体			PP18S1				1.42				0.582							69.560				3.54								3.29									0.92						1.01
柳林子岩体			PP18S2				0.87				0.600							76.228				4.01								6.59									0.77						0.87

取样位置		样品号			SiO₂			TiO₂					Al₂O₃			Fe₂O₃				FeO				MnO			MgO					CaO			Na₂O			K₂O				P₂O₅				烧失量
北沟岩体		P14S3			78.90			0.15					11.08			1.31				0.18				0.014			0.22					0.15			0.98			5.5				0.04				0.77
		P14S9			75.16			0.21					11.68			3.29				1.22				0.170			0.56					0.70			1.52			5.44				0.06				0.58
		P14S10			76.69			0.19					11.48			2.53				0.75				0.110			0.43					0.48			1.45			5.37				0.05				0.61
正岔岩体		PP23S1			75.76			0.2					13.12			0.49				0.54				0.068			0.14					0.22			3.86			5.64				0.05				0.31
正岔岩体		PP23S2			75.35			0.31					13.45			0.67				0.36				0.042			0.13					0.54			4.12			5.29				0.04				0.24
柳林子岩体		PP18S1			47.96			1.32					13.49			2.37				10.35				0.190			8.27					10.29			2.34			0.57				0.10				2.51
柳林子岩体		PP18S2			46.83			1.17					13.07			1.98				9.82				0.170			7.97					10.03			1.83			0.49				0.15				2.26
取样位置	样品号			La		Ce			Pr			Nd			Sm				Eu		Gd				Tb			Dy			Ho			Er			Tm				Yb		Lu				Y
北沟岩体	P14S3			3.87		8.27			1.062			5.22			1.33				0.40		1.54				0.30			1.61			0.34			0.74			0.14				1.01		0.14				9.07
	P14S9			16.08		40.25			3.642			13.69			2.41				0.36		2.45				0.49			3.30			0.78			2.57			0.49				3.53		0.50				21.95
	P14S10			9.97		24.26			2.352			9.45			1.87				0.38		2.00				0.39			2.46			0.56			1.66			0.32				2.27		0.32				15.51
正岔岩体	PP23S1			74.86		145.8			16.76			64.96			10.30				2.24		8.27				1.09			5.56			1.05			2.72			0.41				2.29		0.39				27.90
正岔岩体	PP23S2			73.54		123.5			12.57			67.34			9.45				2.05		6.34				1.43			5.23			0.86			1.87			0.35				2.45		0.32				23.43
柳林子岩体	PP18S1			9.132		21.98			3.098			15.13			3.68				1.20		4.37				0.72			4.26			0.90			2.35			0.36				1.99		0.35				19.93
柳林子岩体	PP18S2			12.32		23.34			3.430			16.43			4.32				1.17		5.02				0.98			3.94			0.92			2.43			0.33				1.34		0.25				16.34
取样位置	样品号			Cr			Co			Ni				Ga			Th			Rb			Sr			Zr			Nb				Cs			Ba				Hf				Ta				U
北沟岩体	P14S3			292.50			48.01			125.80				11.28			0.83			17.97			224.2			18.69			2.11				0.74			76.17				0.69				1.97				0.17
	P14S9			6.35			3.07			4.39				10.15			5.53			19.71			70.6			240.5			11.51				18.44			108.90				7.25				0.97				1.05
	P14S10			200.20			27.90			78.40				11.07			3.25			18.26			116.3			158.6			7.45				9.56			87.39				4.36				1.72				0.74
正岔岩体	PP23S1			31.12			12.3			20.89				63.88			16.2			122.5			500.9			207.9			25.39				0.69			1 740.5				4.81				1.86				2.27
正岔岩体	PP23S2			19.52			11.4			16.32				45.22			15.7			108.2			402.3			187.4			22.53				0.45			1 802.1				4.02				1.23				2.06
柳林子岩体	PP18S1			69.81			61.53			100.40				21.27			1.09			41.15			272.4			83.0			6.93				0.71			157.6				2.78				0.49				0.37
柳林子岩体	PP18S2			61.12			56.23			76.43				34.76			0.93			34.87			301.2			73.3			5.93				0.62			134.79				3.34				0.83				0.43
取样位置			样品号				σ₄₃				A/CNK							ΣREE				LREE/HREE								(La/Yb)_N									δEu						δCe
北沟岩体			P14S3				1.13				1.067							26.03				3.44								2.73									0.87						0.98
			P14S9				1.51				0.984							90.60				5.40								3.26									0.45						1.24
			P14S10				1.38				1.018							58.32				4.83								3.15									0.61						1.19
正岔岩体			PP23S1				2.76				1.021							336.75				14.43								23.41									0.72						0.97
正岔岩体			PP23S2				2.75				0.997							307.30				15.30								21.53									0.76						0.91
柳林子岩体			PP18S1				1.42				0.582							69.560				3.54								3.29									0.92						1.01
柳林子岩体			PP18S2				0.87				0.600							76.228				4.01								6.59									0.77						0.87