粤桂地区白垩纪中期安山岩年代学、地球化学特征及其构造意义

doi:10.19657/j.geoscience.1000-8527.2020.076

现代地质 ›› 2021, Vol. 35 ›› Issue (04): 968-980.DOI: 10.19657/j.geoscience.1000-8527.2020.076

粤桂地区白垩纪中期安山岩年代学、地球化学特征及其构造意义

刘洋¹(), 方念乔¹(), 强萌麟², 贾磊³, 宋超杰⁴

1.中国地质大学(北京) 海洋学院,北京 100083
2.山东省第三地质矿产勘查院,山东烟台 264000
3.广州海洋地质调查局,广东广州 510760
4.五矿矿业控股有限公司, 安徽合肥 230091

收稿日期:2020-04-29 修回日期:2020-09-10 出版日期:2021-08-10 发布日期:2021-09-08
通讯作者: 方念乔
作者简介:方念乔,男,教授,博士生导师,1949年出生,海洋地质专业,主要从事海洋地质、沉积地质和大地构造的科研与教学工作。Email: fangnq@cugb.edu.cn。
刘洋,男,博士研究生,1990年出生,海洋科学专业,主要从事岩浆岩及大地构造学研究。Email: liuyang74823@sina.com。
基金资助:
国家自然科学基金项目(41572207);国家自然科学基金项目(41030853);国家自然科学基金项目(41276047)

Geochronology, Geochemistry, and Tectonic Significance of Mid-Cretaceous Andesites in Guangxi and Guangdong

LIU Yang¹(), FANG Nianqiao¹(), QIANG Menglin², JIA Lei³, SONG Chaojie⁴

1. School of Ocean Sciences, China University of Geosciences, Beijing 100083, China
2. Shandong No.3 Exploration Institute of Geology and Mineral Research, Yantai, Shandong 264000, China
3. Guangzhou Marine Geological Survey, Guangzhou, Guangdong 510760, China
4. Minmetals Mining Holdings Limited, Hefei, Anhui 230091,China

Received:2020-04-29 Revised:2020-09-10 Online:2021-08-10 Published:2021-09-08
Contact: FANG Nianqiao

摘要/Abstract

摘要：

华南沿海地区存在丰富的白垩纪岩浆活动记录。粤桂地区作为华南沿海的重要组成部分,其白垩纪安山岩的出露数量虽然有限,但对于揭示晚中生代大陆边缘的构造性质具有特殊意义。选取广西玉林、广东连平的安山岩作为研究对象,结合前人对广东仁化地区样品的研究成果,应用岩相学、同位素年代学、地球化学等多种分析方法,对上述岩石开展系统研究。结果显示:(1)安山岩具斑状结构,斑晶主要为角闪石、辉石和斜长石,基质主要为斜长石微晶;(2)玉林安山岩U-Pb谐和年龄为(93.38±0.83) Ma,略晚于仁化的105 Ma,白垩纪中期粤桂地区有众多安山岩形成;(3)安山岩高MgO含量和Mg^#值, FeO^T/MgO值较低,富集轻稀土元素和LILEs,但亏损HFSEs。研究区安山岩由俯冲沉积物部分熔融形成的硅质熔体与地幔橄榄岩平衡反应所形成。高镁安山岩与邻近区域的埃达克质岩石基本同时产出,显示与受太平洋域控制的浙闽地区在构造环境上存在明显差别。据此推测,南海北部陆缘在晚中生代时可能受到来自新特提斯域洋脊俯冲的影响。

关键词: 南海北部陆缘, 白垩纪中期, 高镁安山岩, 洋脊俯冲

Abstract:

There are numerous records of Cretaceous magmatism in the coastal Southeast China. Cretaceous andesite is limited in Guangdong and Guangxi, but it may significantly reveal the Late Mesozoic tectonic setting of the northern continental margin of the South China Sea (SCS). In this paper, andesites from Yulin in Guangxi, together with Lianping and Renhua in Guangdong are selected for the study. Based on zircon U-Pb geochronology, petrography and geochemistry, systematic study on the above rock types is carried out for the first time. The results include: (1) The samples are porphyritic with phenocrysts of mainly hornblende, pyroxene and plagioclase, and the groundmass displays andesitic texture with mainly subhedral plagioclase grains; (2) Zircons of Yulin andesite yielded a weighted mean ²⁰⁶Pb/²³⁸U age of (93.38±0.83) Ma, which is younger than the Renhua andesites (zircon U-P age: ca.105 Ma). Therefore, there are many Mid-Cretaceous andesite records in the northern continental margin of SCS; (3) The samples are charactered with high MgO and Mg^#, lower FeO^T/MgO ratios, and are LREE- and LILE-enriched and HFSE-depleted. The high-Mg andesites in Guangdong and Guangxi were formed almost coevally with the adakitic rocks in Hainan Island and Shilu (Guangdong), indicating that the tectonic setting in northern continental margin of SCS differs from that of Zhejiang and Fujian, which was influenced by the Paleo-Pacific subduction. It is concluded that tectonics of the northern SCS margin may have been influenced by the Late Mesozoic Neo-Tethyan ridge subduction.

Key words: northern South China Sea margin, Mid-Cretaceous, high-Mg andesite, Neo-Tethyan ridge subduction

中图分类号:

刘洋, 方念乔, 强萌麟, 贾磊, 宋超杰. 粤桂地区白垩纪中期安山岩年代学、地球化学特征及其构造意义[J]. 现代地质, 2021, 35(04): 968-980.

LIU Yang, FANG Nianqiao, QIANG Menglin, JIA Lei, SONG Chaojie. Geochronology, Geochemistry, and Tectonic Significance of Mid-Cretaceous Andesites in Guangxi and Guangdong[J]. Geoscience, 2021, 35(04): 968-980.

图/表 9

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点号	Th/ 10^-6	U/ 10^-6	Th/ U	同位素比值				年龄/Ma
点号	Th/ 10^-6	U/ 10^-6	Th/ U	²⁰⁷Pb/²⁰⁶Pb±1σ	²⁰⁷Pb/²³⁵U±1σ	²⁰⁶Pb/²³⁸U±1σ		²⁰⁷Pb/²⁰⁶Pb±1σ		²⁰⁷Pb/²³⁵U±1σ		²⁰⁶Pb/²³⁸U±1σ
4	778	660	1.18	0.052 943±0.002 028	0.105 863±0.004 260	0.014 550±0.000 162	327.84±87.03		102.17±3.91		93.12±1.03
8	215	319	0.67	0.055 402±0.005 689	0.106 484±0.009 310	0.014 642±0.000 365	427.83±226.82		102.74±8.54		93.71±2.32
10	785	647	1.21	0.048 431±0.002 114	0.095 819±0.004 078	0.014 437±0.000 160	120.46±103.69		92.91±3.78		92.40±1.02
12	662	887	0.75	0.052 819±0.002 251	0.105 023±0.004 352	0.014 548±0.000 155	320.43±98.14		101.40±4.00		93.11±0.98
13	52	563	0.09	0.047 487±0.004 553	0.095 395±0.009 201	0.014 721±0.000 308	72.32±214.79		92.52±8.53		94.21±1.95
17	807	1 007	0.80	0.048 714±0.001 889	0.097 236±0.003 751	0.014 577±0.000 148	200.08±97.21		94.22±3.47		93.29±0.94
18	288	1 658	0.17	0.048 054±0.001 621	0.097 694±0.003 339	0.014 783±0.000 153	101.94±84.25		94.65±3.09		94.60±0.97
1	370	1 097	0.34	0.069 394±0.000 946	1.479 264±0.022 043	0.154 699±0.001 383	910.19±27.78		921.93±9.03		927.25±7.72
2	352	814	0.43	0.073 216±0.001 017	1.542 407±0.023 326	0.152 604±0.001 137	1 020.37±28.55		947.47±9.32		915.54±6.36
3	6	722	0.01	0.151 631±0.001 552	8.842 395±0.097 376	0.422 511±0.002 668	2 364.51±18.36		2 321.88±10.05		2 271.87±12.09
5	360	1 971	0.18	0.060 137±0.000 686	0.842 628±0.010 756	0.101 390±0.000 711	609.28±24.07		620.59±5.93		622.55±4.16
6	375	1 076	0.35	0.089 175±0.000 967	2.883 195±0.032 698	0.234 226±0.001 542	1 409.26±20.83		1 377.53±8.55		1 356.61±8.05
7	214	722	0.30	0.070 226±0.001 039	1.500 139±0.025 399	0.154 576±0.001 463	1 000.00±29.63		930.44±10.32		926.56±8.17
9	570	871	0.65	0.072 671±0.001 129	1.533 127±0.027 094	0.152 402±0.001 352	1 005.56±31.48		943.75±10.86		914.41±7.57
11	614	896	0.69	0.097 284±0.001 131	3.598 950±0.046 454	0.267 513±0.002 156	1 572.53±21.76		1 549.30±10.26		1 528.17±10.96
14	2 119	662	3.20	0.064 143±0.001 041	0.993 233±0.015 529	0.112 186±0.000 638	746.30±33.33		700.37±7.91		685.43±3.70
15	536	507	1.06	0.059 697±0.001 110	0.838 994±0.016 053	0.101 737±0.000 750	592.31±40.73		618.59±8.86		624.58±4.39
16	432	551	0.78	0.064 711±0.001 099	1.103 915±0.019 405	0.123 530±0.000 941	764.82±236.11		755.24±9.37		750.85±5.40

点号	Th/ 10^-6	U/ 10^-6	Th/ U	同位素比值				年龄/Ma
点号	Th/ 10^-6	U/ 10^-6	Th/ U	²⁰⁷Pb/²⁰⁶Pb±1σ	²⁰⁷Pb/²³⁵U±1σ	²⁰⁶Pb/²³⁸U±1σ		²⁰⁷Pb/²⁰⁶Pb±1σ		²⁰⁷Pb/²³⁵U±1σ		²⁰⁶Pb/²³⁸U±1σ
4	778	660	1.18	0.052 943±0.002 028	0.105 863±0.004 260	0.014 550±0.000 162	327.84±87.03		102.17±3.91		93.12±1.03
8	215	319	0.67	0.055 402±0.005 689	0.106 484±0.009 310	0.014 642±0.000 365	427.83±226.82		102.74±8.54		93.71±2.32
10	785	647	1.21	0.048 431±0.002 114	0.095 819±0.004 078	0.014 437±0.000 160	120.46±103.69		92.91±3.78		92.40±1.02
12	662	887	0.75	0.052 819±0.002 251	0.105 023±0.004 352	0.014 548±0.000 155	320.43±98.14		101.40±4.00		93.11±0.98
13	52	563	0.09	0.047 487±0.004 553	0.095 395±0.009 201	0.014 721±0.000 308	72.32±214.79		92.52±8.53		94.21±1.95
17	807	1 007	0.80	0.048 714±0.001 889	0.097 236±0.003 751	0.014 577±0.000 148	200.08±97.21		94.22±3.47		93.29±0.94
18	288	1 658	0.17	0.048 054±0.001 621	0.097 694±0.003 339	0.014 783±0.000 153	101.94±84.25		94.65±3.09		94.60±0.97
1	370	1 097	0.34	0.069 394±0.000 946	1.479 264±0.022 043	0.154 699±0.001 383	910.19±27.78		921.93±9.03		927.25±7.72
2	352	814	0.43	0.073 216±0.001 017	1.542 407±0.023 326	0.152 604±0.001 137	1 020.37±28.55		947.47±9.32		915.54±6.36
3	6	722	0.01	0.151 631±0.001 552	8.842 395±0.097 376	0.422 511±0.002 668	2 364.51±18.36		2 321.88±10.05		2 271.87±12.09
5	360	1 971	0.18	0.060 137±0.000 686	0.842 628±0.010 756	0.101 390±0.000 711	609.28±24.07		620.59±5.93		622.55±4.16
6	375	1 076	0.35	0.089 175±0.000 967	2.883 195±0.032 698	0.234 226±0.001 542	1 409.26±20.83		1 377.53±8.55		1 356.61±8.05
7	214	722	0.30	0.070 226±0.001 039	1.500 139±0.025 399	0.154 576±0.001 463	1 000.00±29.63		930.44±10.32		926.56±8.17
9	570	871	0.65	0.072 671±0.001 129	1.533 127±0.027 094	0.152 402±0.001 352	1 005.56±31.48		943.75±10.86		914.41±7.57
11	614	896	0.69	0.097 284±0.001 131	3.598 950±0.046 454	0.267 513±0.002 156	1 572.53±21.76		1 549.30±10.26		1 528.17±10.96
14	2 119	662	3.20	0.064 143±0.001 041	0.993 233±0.015 529	0.112 186±0.000 638	746.30±33.33		700.37±7.91		685.43±3.70
15	536	507	1.06	0.059 697±0.001 110	0.838 994±0.016 053	0.101 737±0.000 750	592.31±40.73		618.59±8.86		624.58±4.39
16	432	551	0.78	0.064 711±0.001 099	1.103 915±0.019 405	0.123 530±0.000 941	764.82±236.11		755.24±9.37		750.85±5.40

样品	编号	SiO₂			TiO₂			Al₂O₃			FeO^T			MnO			MgO			CaO				Na₂O			K₂O			P₂O₅			烧失量			总量
玉林	LC1-1	54.67			0.81			15.72			7.09			0.13			7.61			7.83				2.8			2.06			0.17			1.24			100.13
	LC4-1	54.07			0.80			15.16			7.67			0.12			8.28			7.54				2.88			2.02			0.17			1.47			100.17
	LC2-1	54.39			0.80			15.48			7.67			0.13			7.84			7.35				2.83			2.05			0.17			1.37			100.07
	LC2-2	54.31			0.80			15.46			7.74			0.12			7.85			7.32				2.88			2.09			0.17			1.33			100.07
连平	LP4-1	60.55			0.73			16.86			5.65			0.11			3.05			5.93				3.20			2.19			0.40			0.99			99.66
	LP4-1b	60.28			0.71			17.00			5.59			0.11			3.23			5.92				3.30			2.17			0.39			0.96			99.66
	LP4-2	60.52			0.65			17.17			5.47			0.13			3.14			5.96				3.10			2.11			0.40			0.96			99.61
样品	编号	La	Ce			Pr			Nd			Sm			Eu			Gd			Tb		Dy			Ho			Er			Tm			Yb		Lu
玉林	LC1-1	28.7	51.8			6.44			24.5			4.41			1.11			3.51			0.62		3.19			0.63			1.73			0.31			1.80		0.45
	LC4-1	24.3	40.6			5.25			19.5			3.51			0.87			2.89			0.49		2.50			0.50			1.35			0.25			1.52		0.40
	LC2-1	27.0	49.9			6.13			24.0			4.38			1.23			3.77			0.58		3.25			0.62			1.76			0.28			1.81		0.26
	LC2-2	26.7	50.7			6.12			23.4			4.39			1.25			3.82			0.60		3.27			0.62			1.77			0.27			1.82		0.27
连平	LP4-1	35.4	65.4			7.65			29.0			5.07			1.65			4.36			0.62		3.26			0.63			1.83			0.28			1.77		0.28
	LP4-1b	35.6	65.5			7.62			28.8			5.05			1.62			4.33			0.61		3.24			0.62			1.81			0.27			1.76		0.29
	LP4-2	36.8	67.6			7.91			29.7			5.26			1.72			4.50			0.64		3.40			0.65			1.87			0.29			1.84		0.29
样品	编号	Y		Ba			Rb			Th			Nb			U			Ta			Sr			Zr			Hf			Pb			Sc			V
玉林	LC1-1	16.5		570			61.3			8.00			8.97			1.81			0.90			530			164			4.51			12.7			22.2			174
	LC4-1	13.1		589			65.0			7.89			8.73			1.73			0.50			533			125			3.35			12.4			23.2			163
	LC2-1	17.2		549			66.2			7.51			8.04			1.59			0.51			509			167			4.40			13.0			25.4			146
	LC2-2	17.5		556			65.1			7.36			8.27			1.48			0.51			515			164			4.30			11.0			20.3			142
连平	LP4-1	17.8		766			71.9			6.43			17.4			1.31			1.21			810			126			3.46			21.6			11.9			100
	LP4-1b	17.8		757			71.8			6.44			17.5			1.33			1.15			810			128			3.49			20.8			11.7			098
	LP4-2	18.5		910			70.7			6.70			17.7			1.37			1.17			818			130			3.56			21.5			12.5			105
样品	编号	Cr			Co			Ni			(La/Yb)_N			Eu/Eu^*			Sr/Y			La/Yb				Nb/Yb			Th/Yb			Zr/Yb			Th/Nb			U/Th
玉林	LC1-1	369			33.1			147			11.42			0.84			32.09			15.92				4.98			4.44			91.34			0.89			0.23
	LC4-1	353			34.3			148			11.47			0.81			40.82			15.99				5.75			5.19			82.04			0.90			0.22
	LC2-1	424			34.6			134			10.70			0.90			29.53			14.91				4.43			4.14			92.35			0.93			0.21
	LC2-2	415			33.8			128			10.54			0.91			29.34			14.70				4.55			4.04			90.27			0.89			0.20
连平	LP4-1	32.8			16.4			18.2			14.35			1.05			45.51			20.00				9.83			3.63			71.19			0.37			0.20
	LP4-1b	34.3			15.7			17.7			14.51			1.03			45.51			20.23				9.94			3.66			72.73			0.37			0.21
	LP4-2	36.1			20.5			19.1			14.35			1.05			44.22			20.00				9.62			3.64			70.65			0.38			0.20

样品	编号	SiO₂			TiO₂			Al₂O₃			FeO^T			MnO			MgO			CaO				Na₂O			K₂O			P₂O₅			烧失量			总量
玉林	LC1-1	54.67			0.81			15.72			7.09			0.13			7.61			7.83				2.8			2.06			0.17			1.24			100.13
	LC4-1	54.07			0.80			15.16			7.67			0.12			8.28			7.54				2.88			2.02			0.17			1.47			100.17
	LC2-1	54.39			0.80			15.48			7.67			0.13			7.84			7.35				2.83			2.05			0.17			1.37			100.07
	LC2-2	54.31			0.80			15.46			7.74			0.12			7.85			7.32				2.88			2.09			0.17			1.33			100.07
连平	LP4-1	60.55			0.73			16.86			5.65			0.11			3.05			5.93				3.20			2.19			0.40			0.99			99.66
	LP4-1b	60.28			0.71			17.00			5.59			0.11			3.23			5.92				3.30			2.17			0.39			0.96			99.66
	LP4-2	60.52			0.65			17.17			5.47			0.13			3.14			5.96				3.10			2.11			0.40			0.96			99.61
样品	编号	La	Ce			Pr			Nd			Sm			Eu			Gd			Tb		Dy			Ho			Er			Tm			Yb		Lu
玉林	LC1-1	28.7	51.8			6.44			24.5			4.41			1.11			3.51			0.62		3.19			0.63			1.73			0.31			1.80		0.45
	LC4-1	24.3	40.6			5.25			19.5			3.51			0.87			2.89			0.49		2.50			0.50			1.35			0.25			1.52		0.40
	LC2-1	27.0	49.9			6.13			24.0			4.38			1.23			3.77			0.58		3.25			0.62			1.76			0.28			1.81		0.26
	LC2-2	26.7	50.7			6.12			23.4			4.39			1.25			3.82			0.60		3.27			0.62			1.77			0.27			1.82		0.27
连平	LP4-1	35.4	65.4			7.65			29.0			5.07			1.65			4.36			0.62		3.26			0.63			1.83			0.28			1.77		0.28
	LP4-1b	35.6	65.5			7.62			28.8			5.05			1.62			4.33			0.61		3.24			0.62			1.81			0.27			1.76		0.29
	LP4-2	36.8	67.6			7.91			29.7			5.26			1.72			4.50			0.64		3.40			0.65			1.87			0.29			1.84		0.29
样品	编号	Y		Ba			Rb			Th			Nb			U			Ta			Sr			Zr			Hf			Pb			Sc			V
玉林	LC1-1	16.5		570			61.3			8.00			8.97			1.81			0.90			530			164			4.51			12.7			22.2			174
	LC4-1	13.1		589			65.0			7.89			8.73			1.73			0.50			533			125			3.35			12.4			23.2			163
	LC2-1	17.2		549			66.2			7.51			8.04			1.59			0.51			509			167			4.40			13.0			25.4			146
	LC2-2	17.5		556			65.1			7.36			8.27			1.48			0.51			515			164			4.30			11.0			20.3			142
连平	LP4-1	17.8		766			71.9			6.43			17.4			1.31			1.21			810			126			3.46			21.6			11.9			100
	LP4-1b	17.8		757			71.8			6.44			17.5			1.33			1.15			810			128			3.49			20.8			11.7			098
	LP4-2	18.5		910			70.7			6.70			17.7			1.37			1.17			818			130			3.56			21.5			12.5			105
样品	编号	Cr			Co			Ni			(La/Yb)_N			Eu/Eu^*			Sr/Y			La/Yb				Nb/Yb			Th/Yb			Zr/Yb			Th/Nb			U/Th
玉林	LC1-1	369			33.1			147			11.42			0.84			32.09			15.92				4.98			4.44			91.34			0.89			0.23
	LC4-1	353			34.3			148			11.47			0.81			40.82			15.99				5.75			5.19			82.04			0.90			0.22
	LC2-1	424			34.6			134			10.70			0.90			29.53			14.91				4.43			4.14			92.35			0.93			0.21
	LC2-2	415			33.8			128			10.54			0.91			29.34			14.70				4.55			4.04			90.27			0.89			0.20
连平	LP4-1	32.8			16.4			18.2			14.35			1.05			45.51			20.00				9.83			3.63			71.19			0.37			0.20
	LP4-1b	34.3			15.7			17.7			14.51			1.03			45.51			20.23				9.94			3.66			72.73			0.37			0.21
	LP4-2	36.1			20.5			19.1			14.35			1.05			44.22			20.00				9.62			3.64			70.65			0.38			0.20

粤桂地区白垩纪中期安山岩年代学、地球化学特征及其构造意义

Geochronology, Geochemistry, and Tectonic Significance of Mid-Cretaceous Andesites in Guangxi and Guangdong

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