内蒙古海拉斯图乌拉A型花岗岩年代学、地球化学特征及其构造意义

doi:10.19657/j.geoscience.1000-8527.2021.050

摘要/Abstract

摘要：

内蒙古苏尼特左旗查干敖包镇南部紧邻中蒙边境线海拉斯图乌拉一带发育的一套钠铁闪石霓辉石碱性花岗岩,是二连—贺根山构造带的重要组成部分,通过对其进行年代学、地球化学研究,以探讨区域构造演化。锆石LA-ICP-MS U-Pb同位素年龄测试结果显示该岩体的侵位年龄为(285.4±1.1) Ma,属早二叠世。岩石地球化学研究表明该岩石具高硅、富碱、准铝、贫镁钙的特点,其化学成分SiO₂含量为76.12%~80.10%,Na₂O+K₂O含量为7.62%~9.19%,MgO含量为0.06%~0.10%,CaO含量为0.11%~0.20%,碱性指数(K₂O+Na₂O)/Al₂O₃=0.98~1.04,属于碱性岩系,岩石稀土总量偏低,轻、重稀土元素分馏明显,δEu 为0.37~0.51,Eu强烈亏损,属造山后伸展事件的产物。其成因可能和华北板块与西伯利亚板块对接后的伸展作用有关,指示二连—贺根山构造带在早二叠世可能已进入造山后演化阶段。

关键词: 内蒙古, A型花岗岩, 二叠纪, 构造环境

Abstract:

The Hailasituwula arfvedsonite-aegitite augite-alkali granite is distributed in southern Chagan’aobao, Sunitezuoqi of Inner Mongolia, an important component of the Erlian-Hegenshan tectonic belt. Through chronological and geochemical studies on it, to explore regional tectonic evolution, LA-ICP-MS zircon U-Pb dating yielded (285.4±1.1) Ma, belonging to the Early Permian, This geochemical study shows that the rocks are featured by being metaluminous, and have relatively high SiO₂(76.12%-80.10%) and alkalis (K₂O+Na₂O=7.62%-9.19%), but low MgO (0.06%-0.10%) and CaO (0.11%-0.20%). The Alkaline index (AI) is 0.98-1.04, and the rocks belong to the alkaline series. The total REE contents of the rocks are relatively low, and the LREEs and HREEs are obviously fractionated. Negative Eu anomalies are distinct (δEu=0.37-0.51), which are coeval with the regional post-orogenic extension. The results indicate that the Erlian-Hegenshan tectonic belt may have entered the post-orogenic stage in the Early Permian.

Key words: Inner Mongolia, A-type granite, Permian, tectonic setting

中图分类号:

P588.1
P597

孙晓东, 陈海云, 于光宁. 内蒙古海拉斯图乌拉A型花岗岩年代学、地球化学特征及其构造意义[J]. 现代地质, 2021, 35(05): 1218-1230.

SUN Xiaodong, CHEN Haiyun, YU Guangning. Geochronology, Geochemistry, and Tectonic Significance of the Hailasituowula A-type Granites in Sunitezuoqi, Inner Mongolia[J]. Geoscience, 2021, 35(05): 1218-1230.

图/表 13

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点号	含量/10^-6		同位素原子比					年龄/Ma
点号	Pb	U	²⁰⁶Pb/²³⁸U	²⁰⁷Pb^/235U	²⁰⁷Pb/²⁰⁶Pb	²⁰⁸Pb/²³²Th	²³²Th/²³⁸U	²⁰⁶Pb/²³⁸U	²⁰⁷Pb^/235U	²⁰⁷Pb/²⁰⁶Pb
1	20	436	0.044 5	0.332 6	0.054 2	0.015 7	0.455 7	281	292	378
2	18	396	0.045 1	0.327 5	0.052 7	0.011 9	0.416 7	284	288	317
3	20	413	0.045 1	0.475 6	0.076 4	0.006 7	1.285 9	285	395	1 106
4	12	274	0.045 1	0.325 1	0.052 3	0.011 7	0.436 8	284	286	297
5	8	172	0.045 4	0.327 3	0.052 2	0.012 0	0.346 7	287	287	295
6	13	273	0.045 6	0.325 4	0.051 8	0.012 6	0.444 6	287	286	276
7	16	361	0.045 2	0.327 3	0.052 5	0.011 6	0.444 4	285	288	306
8	20	401	0.046 1	0.537 4	0.084 5	0.018 6	0.430 4	291	437	1305
9	13	286	0.045 4	0.327 7	0.052 4	0.011 4	0.442 7	286	288	302
10	14	308	0.045 3	0.329 8	0.052 7	0.011 4	0.469 7	286	289	318
11	29	594	0.045 4	0.459 8	0.073 5	0.014 5	0.558 7	286	384	1 028
12	19	414	0.045 1	0.320 5	0.051 6	0.011 0	0.591 5	284	282	266
13	22	473	0.045 1	0.323 7	0.052 1	0.011 2	0.550 5	284	285	290
14	11	242	0.045 3	0.329 9	0.052 8	0.011 3	0.371 7	285	289	322
15	14	302	0.045 4	0.326 6	0.052 1	0.012 1	0.485 1	286	287	292
16	13	270	0.045 3	0.330 6	0.053 0	0.012 9	0.469 1	285	290	327
17	14	310	0.045 3	0.325 3	0.052 1	0.012 7	0.446 2	286	286	289
18	11	224	0.045 5	0.434 9	0.069 4	0.016 3	0.451 0	287	367	910
19	19	448	0.045 1	0.326 7	0.052 6	0.012 9	0.062 8	284	287	311
20	20	418	0.045 0	0.329 8	0.053 1	0.012 9	0.531 8	284	289	333
21	22	476	0.045 6	0.328 6	0.052 2	0.013 4	0.452 4	288	289	295
22	28	598	0.045 6	0.326 5	0.051 9	0.013 9	0.497 8	288	287	280
23	63	1109	0.045 5	0.758 3	0.120 9	0.021 5	0.676 4	287	573	1 970
24	13	289	0.045 2	0.324 3	0.052 1	0.013 9	0.426 9	285	285	288
25	20	435	0.045 3	0.326 7	0.052 3	0.012 8	0.471 3	286	287	299
26	17	359	0.045 3	0.332 6	0.053 3	0.012 8	0.492 5	286	292	339
27	14	299	0.045 8	0.326 6	0.051 7	0.013 3	0.421 2	289	287	274
28	23	486	0.045 3	0.386 5	0.061 9	0.014 9	0.423 7	285	332	672
29	14	308	0.045 4	0.328 6	0.052 5	0.013 1	0.408 7	286	289	306
30	55	1161	0.044 9	0.322 6	0.052 1	0.013 1	0.568 7	283	284	289

点号	含量/10^-6		同位素原子比					年龄/Ma
点号	Pb	U	²⁰⁶Pb/²³⁸U	²⁰⁷Pb^/235U	²⁰⁷Pb/²⁰⁶Pb	²⁰⁸Pb/²³²Th	²³²Th/²³⁸U	²⁰⁶Pb/²³⁸U	²⁰⁷Pb^/235U	²⁰⁷Pb/²⁰⁶Pb
1	20	436	0.044 5	0.332 6	0.054 2	0.015 7	0.455 7	281	292	378
2	18	396	0.045 1	0.327 5	0.052 7	0.011 9	0.416 7	284	288	317
3	20	413	0.045 1	0.475 6	0.076 4	0.006 7	1.285 9	285	395	1 106
4	12	274	0.045 1	0.325 1	0.052 3	0.011 7	0.436 8	284	286	297
5	8	172	0.045 4	0.327 3	0.052 2	0.012 0	0.346 7	287	287	295
6	13	273	0.045 6	0.325 4	0.051 8	0.012 6	0.444 6	287	286	276
7	16	361	0.045 2	0.327 3	0.052 5	0.011 6	0.444 4	285	288	306
8	20	401	0.046 1	0.537 4	0.084 5	0.018 6	0.430 4	291	437	1305
9	13	286	0.045 4	0.327 7	0.052 4	0.011 4	0.442 7	286	288	302
10	14	308	0.045 3	0.329 8	0.052 7	0.011 4	0.469 7	286	289	318
11	29	594	0.045 4	0.459 8	0.073 5	0.014 5	0.558 7	286	384	1 028
12	19	414	0.045 1	0.320 5	0.051 6	0.011 0	0.591 5	284	282	266
13	22	473	0.045 1	0.323 7	0.052 1	0.011 2	0.550 5	284	285	290
14	11	242	0.045 3	0.329 9	0.052 8	0.011 3	0.371 7	285	289	322
15	14	302	0.045 4	0.326 6	0.052 1	0.012 1	0.485 1	286	287	292
16	13	270	0.045 3	0.330 6	0.053 0	0.012 9	0.469 1	285	290	327
17	14	310	0.045 3	0.325 3	0.052 1	0.012 7	0.446 2	286	286	289
18	11	224	0.045 5	0.434 9	0.069 4	0.016 3	0.451 0	287	367	910
19	19	448	0.045 1	0.326 7	0.052 6	0.012 9	0.062 8	284	287	311
20	20	418	0.045 0	0.329 8	0.053 1	0.012 9	0.531 8	284	289	333
21	22	476	0.045 6	0.328 6	0.052 2	0.013 4	0.452 4	288	289	295
22	28	598	0.045 6	0.326 5	0.051 9	0.013 9	0.497 8	288	287	280
23	63	1109	0.045 5	0.758 3	0.120 9	0.021 5	0.676 4	287	573	1 970
24	13	289	0.045 2	0.324 3	0.052 1	0.013 9	0.426 9	285	285	288
25	20	435	0.045 3	0.326 7	0.052 3	0.012 8	0.471 3	286	287	299
26	17	359	0.045 3	0.332 6	0.053 3	0.012 8	0.492 5	286	292	339
27	14	299	0.045 8	0.326 6	0.051 7	0.013 3	0.421 2	289	287	274
28	23	486	0.045 3	0.386 5	0.061 9	0.014 9	0.423 7	285	332	672
29	14	308	0.045 4	0.328 6	0.052 5	0.013 1	0.408 7	286	289	306
30	55	1161	0.044 9	0.322 6	0.052 1	0.013 1	0.568 7	283	284	289

样号		SiO₂			TiO₂					Al₂O₃				Fe₂O₃				FeO					MnO			MgO					CaO				Na₂O				K₂O				P₂O₅				LOS				∑
D5035-5		80.10			0.1					10.75				0.57				0.18					0.02			0.07					0.11				3.46				4.16				0.02				0.37				99.91
D5035-6		77.67			0.11					12.00				0.68				0.32					0.02			0.06					0.13				3.84				4.60				0.02				0.45				99.89
D5035-7		77.27			0.13					12.12				0.74				0.27					0.02			0.07					0.15				3.87				4.78				0.03				0.45				99.89
PM013-6-5		76.80			0.10					12.25				1.00				0.11					0.02			0.10					0.11				3.83				5.05				0.05				0.50				99.93
PM013-6-6		77.59			0.10					11.05				2.01				0.12					0.02			0.08					0.20				3.62				4.15				0.06				0.86				99.89
PM013-6-7		76.12			0.11					12.53				0.75				0.65					0.03			0.06					0.14				4.42				4.77				0.03				0.32				99.93
样号		or		ab					an				c				q				σ				AR			DI				SI				FL				MF			OX			A/CNK				A/NK
D5035-5		24.64		29.28					0.43				0.40				43.64				1.56				4.5			97.96				0.85				98.6				91.31			0.55			1.04				0.95
D5035-6		27.18		32.49					0.53				0.52				37.29				2.05				4.44			97.43				0.58				98.46				94.73			0.53			1.06				0.94
D5035-7		28.31		32.75					0.57				0.37				36.00				2.18				4.41			97.51				0.75				98.33				93.23			0.52			1.05				0.95
PM013-6-5		29.84		32.41					0.25				0.40				34.79				2.33				4.25			97.59				0.99				98.73				91.80			0.52			1.03				0.97
PM013-6-6		24.52		30.63					0.69				0.37				39.81				1.74				4.60			95.89				0.79				97.43				96.44			0.55			1.05				0.94
PM013-6-7		28.25		37.40					0.26								31.63				2.55				5.61			97.59				0.57				98.48				95.85			0.51			1.00				0.99
样号	La		Ce					Pr				Nd				Sm			Eu					Gd			Tb			Dy				Ho			Er				Tm			Yb				Lu				Y
D5035-5	12.72		12.77					4.12				15.20				2.55			0.36					2.07			0.39			2.61				0.58			2.04				0.36			2.57				0.48				15.58
D5035-6	13.58		16.58					3.59				13.45				2.47			0.40					2.21			0.44			2.82				0.63			2.07				0.38			2.78				0.55				16.61
D5035-7	18.82		22.10					5.02				18.72				3.14			0.44					2.52			0.43			2.64				0.54			1.81				0.34			2.43				0.48				13.96
PM013-6-5	14.72		18.53					4.05				16.87				3.68			0.52					3.49			0.71			4.70				0.99			2.92				0.49			3.32				0.66				24.93
PM013-6-6	20.98		38.15					6.94				27.78				5.08			0.56					3.80			0.66			4.00				0.84			2.55				0.47			3.04				0.59				21.00
PM013-6-7	15.51		24.35					4.57				18.13				3.61			0.52					3.17			0.61			3.87				0.85			2.68				0.44			3.15				0.64				22.40
样号		REE					LREE								HREE							LREE/HREE							δEu							(La/Yb)_N						(Ce/Yb)_N							(Sm/Eu)_N
D5035-5		74.41					47.73								11.10							4.30							0.47							3.34						1.28							2.65
D5035-6		78.56					50.07								11.87							4.22							0.51							3.30						1.55							2.34
D5035-7		93.39					68.24								11.18							6.10							0.47							5.22						2.35							2.68
PM013-6-5		100.56					58.37								17.27							3.38							0.43							2.99						1.44							2.69
PM013-6-6		136.44					99.49								15.96							6.23							0.37							4.65						3.24							3.43
PM013-6-7		104.48					66.69								15.39							4.33							0.46							3.32						2.00							2.63
样号		Rb				Ba					Th				U					K					Nb				Sr				P					Zr				Hf				Ti					V
D5035-5		58.69				75.91					3.99				1.17					3 4535.10					5.35				9.15				43.82					192.00				4.06				609.70					27.61
D5035-6		61.02				86.54					4.39				1.03					38 134.55					6.43				8.44				63.67					187.42				3.89				675.51					25.42
D5035-7		58.92				104.00					4.77				1.54					39 700.12					6.48				9.09				67.09					212.22				4.27				772.47					25.81
PM013-6-5		78.41				102.40					4.59				2.19					41 892.86					8.91				11.84				138.31					195.21				5.12				627.15					21.34
PM013-6-6		66.21				125.70					5.42				2.28					34 398.10					7.73				15.09				171.86					313.50				7.88				629.39					80.31
PM013-6-7		83.35				78.31					5.36				1.34					39 609.52					10.70				8.52				84.32					245.19				6.18				663.03					26.71
样号		Cr			Co					Ni				Tb				Nb^*					Sr^*			P^*					Zr^*				Ti^*				10000×Ga/Al						Y/Nb					Rb/Nb
D5035-5		14.53			0.49					0.77				0.39				0.09					0.04			0.04					4.15				0.10				3.29						2.91					10.98
D5035-6		14.30			0.75					1.07				0.44				0.10					0.04			0.07					4.05				0.11				3.22						2.58					9.49
D5035-7		14.50			0.25					0.90				0.43				0.10					0.03			0.06					3.67				0.10				3.01						2.16					9.10
PM013-6-5		10.25			0.44					0.74				0.71				0.13					0.04			0.11					2.70				0.06				3.11						2.80					8.80
PM013-6-6		10.48			0.83					2.73				0.66				0.13					0.03			0.09					3.19				0.05				3.14						2.72					8.57
PM013-6-7		11.11			0.34					0.93				0.61				0.16					0.03			0.06					3.65				0.07				3.51						2.09					7.79

样号		SiO₂			TiO₂					Al₂O₃				Fe₂O₃				FeO					MnO			MgO					CaO				Na₂O				K₂O				P₂O₅				LOS				∑
D5035-5		80.10			0.1					10.75				0.57				0.18					0.02			0.07					0.11				3.46				4.16				0.02				0.37				99.91
D5035-6		77.67			0.11					12.00				0.68				0.32					0.02			0.06					0.13				3.84				4.60				0.02				0.45				99.89
D5035-7		77.27			0.13					12.12				0.74				0.27					0.02			0.07					0.15				3.87				4.78				0.03				0.45				99.89
PM013-6-5		76.80			0.10					12.25				1.00				0.11					0.02			0.10					0.11				3.83				5.05				0.05				0.50				99.93
PM013-6-6		77.59			0.10					11.05				2.01				0.12					0.02			0.08					0.20				3.62				4.15				0.06				0.86				99.89
PM013-6-7		76.12			0.11					12.53				0.75				0.65					0.03			0.06					0.14				4.42				4.77				0.03				0.32				99.93
样号		or		ab					an				c				q				σ				AR			DI				SI				FL				MF			OX			A/CNK				A/NK
D5035-5		24.64		29.28					0.43				0.40				43.64				1.56				4.5			97.96				0.85				98.6				91.31			0.55			1.04				0.95
D5035-6		27.18		32.49					0.53				0.52				37.29				2.05				4.44			97.43				0.58				98.46				94.73			0.53			1.06				0.94
D5035-7		28.31		32.75					0.57				0.37				36.00				2.18				4.41			97.51				0.75				98.33				93.23			0.52			1.05				0.95
PM013-6-5		29.84		32.41					0.25				0.40				34.79				2.33				4.25			97.59				0.99				98.73				91.80			0.52			1.03				0.97
PM013-6-6		24.52		30.63					0.69				0.37				39.81				1.74				4.60			95.89				0.79				97.43				96.44			0.55			1.05				0.94
PM013-6-7		28.25		37.40					0.26								31.63				2.55				5.61			97.59				0.57				98.48				95.85			0.51			1.00				0.99
样号	La		Ce					Pr				Nd				Sm			Eu					Gd			Tb			Dy				Ho			Er				Tm			Yb				Lu				Y
D5035-5	12.72		12.77					4.12				15.20				2.55			0.36					2.07			0.39			2.61				0.58			2.04				0.36			2.57				0.48				15.58
D5035-6	13.58		16.58					3.59				13.45				2.47			0.40					2.21			0.44			2.82				0.63			2.07				0.38			2.78				0.55				16.61
D5035-7	18.82		22.10					5.02				18.72				3.14			0.44					2.52			0.43			2.64				0.54			1.81				0.34			2.43				0.48				13.96
PM013-6-5	14.72		18.53					4.05				16.87				3.68			0.52					3.49			0.71			4.70				0.99			2.92				0.49			3.32				0.66				24.93
PM013-6-6	20.98		38.15					6.94				27.78				5.08			0.56					3.80			0.66			4.00				0.84			2.55				0.47			3.04				0.59				21.00
PM013-6-7	15.51		24.35					4.57				18.13				3.61			0.52					3.17			0.61			3.87				0.85			2.68				0.44			3.15				0.64				22.40
样号		REE					LREE								HREE							LREE/HREE							δEu							(La/Yb)_N						(Ce/Yb)_N							(Sm/Eu)_N
D5035-5		74.41					47.73								11.10							4.30							0.47							3.34						1.28							2.65
D5035-6		78.56					50.07								11.87							4.22							0.51							3.30						1.55							2.34
D5035-7		93.39					68.24								11.18							6.10							0.47							5.22						2.35							2.68
PM013-6-5		100.56					58.37								17.27							3.38							0.43							2.99						1.44							2.69
PM013-6-6		136.44					99.49								15.96							6.23							0.37							4.65						3.24							3.43
PM013-6-7		104.48					66.69								15.39							4.33							0.46							3.32						2.00							2.63
样号		Rb				Ba					Th				U					K					Nb				Sr				P					Zr				Hf				Ti					V
D5035-5		58.69				75.91					3.99				1.17					3 4535.10					5.35				9.15				43.82					192.00				4.06				609.70					27.61
D5035-6		61.02				86.54					4.39				1.03					38 134.55					6.43				8.44				63.67					187.42				3.89				675.51					25.42
D5035-7		58.92				104.00					4.77				1.54					39 700.12					6.48				9.09				67.09					212.22				4.27				772.47					25.81
PM013-6-5		78.41				102.40					4.59				2.19					41 892.86					8.91				11.84				138.31					195.21				5.12				627.15					21.34
PM013-6-6		66.21				125.70					5.42				2.28					34 398.10					7.73				15.09				171.86					313.50				7.88				629.39					80.31
PM013-6-7		83.35				78.31					5.36				1.34					39 609.52					10.70				8.52				84.32					245.19				6.18				663.03					26.71
样号		Cr			Co					Ni				Tb				Nb^*					Sr^*			P^*					Zr^*				Ti^*				10000×Ga/Al						Y/Nb					Rb/Nb
D5035-5		14.53			0.49					0.77				0.39				0.09					0.04			0.04					4.15				0.10				3.29						2.91					10.98
D5035-6		14.30			0.75					1.07				0.44				0.10					0.04			0.07					4.05				0.11				3.22						2.58					9.49
D5035-7		14.50			0.25					0.90				0.43				0.10					0.03			0.06					3.67				0.10				3.01						2.16					9.10
PM013-6-5		10.25			0.44					0.74				0.71				0.13					0.04			0.11					2.70				0.06				3.11						2.80					8.80
PM013-6-6		10.48			0.83					2.73				0.66				0.13					0.03			0.09					3.19				0.05				3.14						2.72					8.57
PM013-6-7		11.11			0.34					0.93				0.61				0.16					0.03			0.06					3.65				0.07				3.51						2.09					7.79