海南岛高峰、保城地区花岗岩年代学、地球化学特征及构造意义

doi:10.19657/j.geoscience.1000-8527.2019.01.09

摘要/Abstract

摘要：

海南岛南部地区遍布晚中生代花岗岩,高峰、保城岩体即为其中的典型代表。应用同位素地质年代学和岩石地球化学分析方法,测得两岩体的年龄分别为(105.4±3.7) Ma和(105.8±2.4) Ma,岩石硅、碱含量中等,铝饱和指数分别为0.95~1.03和1.05~1.30,轻稀土富集,重稀土亏损,轻重稀土分馏程度较高,高场强元素亏损,大离子亲石元素富集。斜长石含量>19%,角闪石含量>3%,石英含量﹤32%,P₂O₅与SiO₂呈负相关,表明高峰、保城花岗岩体属于I型花岗岩。海南岛南部晚中生代花岗岩的大量形成并非孤立现象,该地区早白垩世安山岩-流纹岩组合和白垩纪沉积序列与花岗岩一起构建起较为完整的安第斯型大陆边缘弧体系,而且这一活动陆缘体系在岩石组合、展布和演化特征上与时代大体相当的浙闽地区活动陆缘体系存在明显区别,在区域构造意义的研究中值得给予特别关注。

关键词: 海南岛, 晚中生代, I型花岗岩, 俯冲, 陆缘弧体系

Abstract:

Magmatism in Hainan Island was intense during the late Mesozoic. Studies on the granites on the island can improve our understanding on the Cretaceous tectonic setting of the northern margin of the South China Sea. The Gaofeng and Baocheng batholiths on the island are zoned complexes, which contain mainly fine-medium-grained biotite monzogranite and minor granodiorite. These granitoids are classified as I-type. LA-ICP-MS zircon U-Pb dating of the Gaofeng and Baocheng granitoids yielded (105.4±3.7) Ma and (105.8±2.4) Ma, respectively. In terms of major element compositions, the Gaofeng and Baocheng granitoids contain medium SiO₂ and total alkali contents. Light and heavy rare earth elements are highly fractionated in these rocks, and they are enriched in LREEs but depleted in HREEs. The granitoids are also enriched in large ion lithophile elements (LILEs) and depleted in high field strength elements (HFSEs). Hence, the petrographic and geochemical features of these rocks indicate that the late Mesozoic tectonic setting of Hainan Island was a marginal arc. Additionally, this arc was significantly different from the coeval Western Pacific magmatic arc in the Zhejiang and Fujian regions. The topic deserves special attention in regional tectonic studies.

Key words: Hainan Island, Late Mesozoic, I-type granite, subduction, marginal arc

中图分类号:

袁晓博, 方念乔, 董海龙. 海南岛高峰、保城地区花岗岩年代学、地球化学特征及构造意义[J]. 现代地质, 2019, 33(01): 85-97.

YUAN Xiaobo, FANG Nianqiao, DONG Hailong. Geochronology, Geochemistry and Tectonic Significance of Gaofeng and Baocheng Granite Batholiths in Hainan Island[J]. Geoscience, 2019, 33(01): 85-97.

图/表 13

参考文献 74

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测点号	元素含量/(μg/g)			Th/U	同位素比值			同位素年龄/Ma
测点号	²³²Th	²³⁸U	²⁰⁶Pb	Th/U	²⁰⁷Pb/ ²⁰⁶Pb±1σ	²⁰⁷Pb/ ²³⁵U±1σ	²⁰⁶Pb/ ²³⁸U±1σ	²⁰⁷Pb/ ²⁰⁶Pb±1σ	²⁰⁷Pb/ ²³⁵U±1σ	²⁰⁶Pb/ ²³⁸U±1σ
YL701-2	50.95	86.45	6.03	0.59	0.051 0±0.008 4	0.117 1±0.018 7	0.016 6±0.000 5	242.1±339.6	112.4±17.0	106.4±3.37
YL701-4	1 072.10	1 393.70	96.12	0.77	0.055 8±0.002 6	0.127 3±0.004 8	0.016 5±0.000 3	445.1±101.3	121.7±4.3	105.7±1.72
YL701-6	107.78	153.27	10.24	0.70	0.045 6±0.004 9	0.100 9±0.010 4	0.016 0±0.000 4	0.1±219.1	97.6±9.6	102.6±2.32
YL701-7	117.51	129.00	8.90	0.91	0.050 8±0.005 7	0.116 0±0.012 5	0.016 6±0.000 4	230.1±240.8	111.5±11.4	106.0±2.59
YL701-8	446.00	614.25	39.48	0.73	0.045 9±0.002 9	0.097 9±0.005 6	0.015 5±0.000 3	0.1±141.1	94.9±5.2	98.9±1.79
YL701-9	174.51	298.16	20.54	0.59	0.049 3±0.003 5	0.112 7±0.007 3	0.016 6±0.000 3	159.6±157.9	108.4±6.6	106.1±2.01
YL701-10	195.72	211.17	15.67	0.93	0.051 8±0.004 7	0.127 8±0.010 9	0.017 9±0.000 4	274.4±194.8	122.1±9.8	114.4±2.53
YL701-15	270.54	333.97	23.33	0.81	0.047 5±0.003 2	0.110 9±0.006 7	0.016 9±0.000 3	74.5±153.5	106.8±6.2	108.2±2.00
SHY401-3	257.50	397.83	27.57	0.65	0.047 3±0.002 5	0.109 4±0.005 0	0.016 8±0.000 3	62.4±123.6	105.4±4.6	107.3±1.68
SHY401-4	250.51	397.51	27.14	0.63	0.046 3±0.002 6	0.105 7±0.005 2	0.016 5±0.000 3	15.5±131.7	102.0±4.8	105.7±1.68
SHY401-6	246.88	380.59	26.40	0.65	0.048 7±0.002 9	0.112 7±0.005 9	0.016 8±0.000 3	133.6±134.6	108.4±5.4	107.2±1.80
SHY401-9	188.96	302.21	19.85	0.63	0.050 1±0.003 6	0.109 5±0.007 2	0.015 9±0.000 3	199.0±159.5	105.5±6.6	101.4±1.90
SHY401-10	230.68	432.05	30.52	0.53	0.046 3±0.002 6	0.108 9±0.005 4	0.017 0±0.000 3	14.6±131.5	104.9±4.9	108.9±1.80
SHY401-11	167.08	288.97	19.88	0.58	0.045 0±0.002 7	0.102 9±0.005 4	0.016 6±0.000 3	0.1±81.5	99.4±5.0	106.1±1.76
SHY401-15	104.77	144.68	10.42	0.72	0.046 3±0.003 9	0.110 5±0.008 7	0.017 3±0.000 3	12.2±189.2	106.4±7.9	110.6±2.08
SHY401-21	115.88	187.81	12.40	0.62	0.053 2±0.003 7	0.116 1±0.007 4	0.015 8±0.000 3	338.8±149.2	111.6±6.7	101.2±1.87
SHY401-22	132.51	147.57	9.96	0.90	0.049 3±0.004 1	0.109 9±0.008 6	0.016 2±0.000 3	162.1±184.5	105.8±7.9	103.4±2.01

测点号	元素含量/(μg/g)			Th/U	同位素比值			同位素年龄/Ma
测点号	²³²Th	²³⁸U	²⁰⁶Pb	Th/U	²⁰⁷Pb/ ²⁰⁶Pb±1σ	²⁰⁷Pb/ ²³⁵U±1σ	²⁰⁶Pb/ ²³⁸U±1σ	²⁰⁷Pb/ ²⁰⁶Pb±1σ	²⁰⁷Pb/ ²³⁵U±1σ	²⁰⁶Pb/ ²³⁸U±1σ
YL701-2	50.95	86.45	6.03	0.59	0.051 0±0.008 4	0.117 1±0.018 7	0.016 6±0.000 5	242.1±339.6	112.4±17.0	106.4±3.37
YL701-4	1 072.10	1 393.70	96.12	0.77	0.055 8±0.002 6	0.127 3±0.004 8	0.016 5±0.000 3	445.1±101.3	121.7±4.3	105.7±1.72
YL701-6	107.78	153.27	10.24	0.70	0.045 6±0.004 9	0.100 9±0.010 4	0.016 0±0.000 4	0.1±219.1	97.6±9.6	102.6±2.32
YL701-7	117.51	129.00	8.90	0.91	0.050 8±0.005 7	0.116 0±0.012 5	0.016 6±0.000 4	230.1±240.8	111.5±11.4	106.0±2.59
YL701-8	446.00	614.25	39.48	0.73	0.045 9±0.002 9	0.097 9±0.005 6	0.015 5±0.000 3	0.1±141.1	94.9±5.2	98.9±1.79
YL701-9	174.51	298.16	20.54	0.59	0.049 3±0.003 5	0.112 7±0.007 3	0.016 6±0.000 3	159.6±157.9	108.4±6.6	106.1±2.01
YL701-10	195.72	211.17	15.67	0.93	0.051 8±0.004 7	0.127 8±0.010 9	0.017 9±0.000 4	274.4±194.8	122.1±9.8	114.4±2.53
YL701-15	270.54	333.97	23.33	0.81	0.047 5±0.003 2	0.110 9±0.006 7	0.016 9±0.000 3	74.5±153.5	106.8±6.2	108.2±2.00
SHY401-3	257.50	397.83	27.57	0.65	0.047 3±0.002 5	0.109 4±0.005 0	0.016 8±0.000 3	62.4±123.6	105.4±4.6	107.3±1.68
SHY401-4	250.51	397.51	27.14	0.63	0.046 3±0.002 6	0.105 7±0.005 2	0.016 5±0.000 3	15.5±131.7	102.0±4.8	105.7±1.68
SHY401-6	246.88	380.59	26.40	0.65	0.048 7±0.002 9	0.112 7±0.005 9	0.016 8±0.000 3	133.6±134.6	108.4±5.4	107.2±1.80
SHY401-9	188.96	302.21	19.85	0.63	0.050 1±0.003 6	0.109 5±0.007 2	0.015 9±0.000 3	199.0±159.5	105.5±6.6	101.4±1.90
SHY401-10	230.68	432.05	30.52	0.53	0.046 3±0.002 6	0.108 9±0.005 4	0.017 0±0.000 3	14.6±131.5	104.9±4.9	108.9±1.80
SHY401-11	167.08	288.97	19.88	0.58	0.045 0±0.002 7	0.102 9±0.005 4	0.016 6±0.000 3	0.1±81.5	99.4±5.0	106.1±1.76
SHY401-15	104.77	144.68	10.42	0.72	0.046 3±0.003 9	0.110 5±0.008 7	0.017 3±0.000 3	12.2±189.2	106.4±7.9	110.6±2.08
SHY401-21	115.88	187.81	12.40	0.62	0.053 2±0.003 7	0.116 1±0.007 4	0.015 8±0.000 3	338.8±149.2	111.6±6.7	101.2±1.87
SHY401-22	132.51	147.57	9.96	0.90	0.049 3±0.004 1	0.109 9±0.008 6	0.016 2±0.000 3	162.1±184.5	105.8±7.9	103.4±2.01

岩体	样品号	SiO₂	TiO₂	Al₂O₃	Fe₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	LOI	Total	ALK	A/NKC	σ
高峰	YL501	65.90	0.71	15.32	1.42	2.61	0.07	1.64	3.51	3.21	4.08	0.16	1.20	99.84	7.29	0.95	2.32
	YL601	71.45	0.27	14.32	1.42	1.00	0.06	0.54	1.71	3.44	4.69	0.08	0.88	99.86	8.13	1.03	2.32
	YL701	69.05	0.52	14.67	1.24	1.84	0.06	1.20	2.52	3.08	4.59	0.11	1.00	99.89	7.67	1.00	2.26
	YL703	69.74	0.45	14.51	0.82	1.89	0.05	1.10	2.54	3.01	4.83	0.10	0.85	99.89	7.84	0.98	2.30
保城	SHY101	72.42	0.25	14.63	0.87	0.69	0.03	0.58	1.58	3.19	4.27	0.06	1.32	99.9	7.47	1.15	1.89
	SHY201	71.76	0.32	14.57	0.97	1.03	0.04	0.81	2.14	3.63	3.74	0.09	0.76	99.87	7.37	1.05	1.89
	SHY302	72.21	0.28	14.39	1.01	0.86	0.04	0.79	1.89	3.45	4.09	0.07	0.77	99.85	7.54	1.06	1.95
	SHY401	69.37	0.34	15.80	1.14	0.98	0.03	0.89	1.70	2.99	3.81	0.08	2.70	99.85	6.80	1.30	1.75

岩体	样品号	SiO₂	TiO₂	Al₂O₃	Fe₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	LOI	Total	ALK	A/NKC	σ
高峰	YL501	65.90	0.71	15.32	1.42	2.61	0.07	1.64	3.51	3.21	4.08	0.16	1.20	99.84	7.29	0.95	2.32
	YL601	71.45	0.27	14.32	1.42	1.00	0.06	0.54	1.71	3.44	4.69	0.08	0.88	99.86	8.13	1.03	2.32
	YL701	69.05	0.52	14.67	1.24	1.84	0.06	1.20	2.52	3.08	4.59	0.11	1.00	99.89	7.67	1.00	2.26
	YL703	69.74	0.45	14.51	0.82	1.89	0.05	1.10	2.54	3.01	4.83	0.10	0.85	99.89	7.84	0.98	2.30
保城	SHY101	72.42	0.25	14.63	0.87	0.69	0.03	0.58	1.58	3.19	4.27	0.06	1.32	99.9	7.47	1.15	1.89
	SHY201	71.76	0.32	14.57	0.97	1.03	0.04	0.81	2.14	3.63	3.74	0.09	0.76	99.87	7.37	1.05	1.89
	SHY302	72.21	0.28	14.39	1.01	0.86	0.04	0.79	1.89	3.45	4.09	0.07	0.77	99.85	7.54	1.06	1.95
	SHY401	69.37	0.34	15.80	1.14	0.98	0.03	0.89	1.70	2.99	3.81	0.08	2.70	99.85	6.80	1.30	1.75

岩体	样品号	Rb	Sr		Ba	Y		Nb		Ta	Zr		Hf		Th	U		La		Ce	Pr		Nd		Sm	Eu
高峰	YL501	159	356		724	23.5		16.3		1.35	274		17.0		18.0	4.1		50.4		96.9	11.0		39.0		6.68	1.37
	YL601	153	191		719	23.2		12.4		1.23	160		7.6		14	2.3		57.1		103.0	11.5		39.6		6.41	1.14
	YL701	207	270		755	27.9		18.1		1.70	256		14.2		25.3	5.7		42.2		85.3	10.4		38.4		7.09	1.22
	YL703	222	292		720	24.1		16.5		1.83	220		13.0		25.4	5.1		46.7		92.2	10.7		38.2		6.70	1.07
保城	SHY101	173	327		705	6.4		8.5		0.71	125		5.88		61.0	7.8		24.9		40.9	4.71		15.4		2.39	0.64
	SHY201	162	412		778	17.5		11.0		1.12	152		8.79		17.6	6.8		57.3		69.7	10.40		34.1		5.66	1.35
	SHY302	174	413		825	8.5		9.6		0.90	141		7.37		12.7	5.3		23.1		46.7	5.26		18.0		2.82	0.75
	SHY401	137	431		858	5.6		9.2		0.73	169		8.96		24.2	3.9		33.8		57.0	6.21		19.2		2.78	0.69
岩体	样品号	Gd		Tb			Dy		Ho			Er		Tm			Yb		Lu			∑REE		La_n/Yb_n
高峰	YL501	5.80		0.85			4.65		0.89			2.42		0.41			2.35		0.34			222.97		15.38
	YL601	5.53		0.81			4.59		0.86			2.44		0.42			2.58		0.42			236.48		15.89
	YL701	5.92		0.93			5.36		1.01			2.75		0.49			2.93		0.44			204.45		10.32
	YL703	5.61		0.87			4.88		0.89			2.37		0.42			2.41		0.35			213.37		13.89
保城	SHY101	1.95		0.26			1.28		0.24			0.68		0.12			0.75		0.13			94.35		23.83
	SHY201	4.84		0.71			3.62		0.64			1.66		0.28			1.75		0.26			192.30		23.46
	SHY302	2.37		0.31			1.60		0.29			0.83		0.14			0.95		0.16			103.25		17.56
	SHY401	2.29		0.28			1.38		0.24			0.70		0.12			0.78		0.12			125.46		31.13