Geochronology, Geochemistry and Tectonic Significance of Gaofeng and Baocheng Granite Batholiths in Hainan Island

doi:10.19657/j.geoscience.1000-8527.2019.01.09

Abstract

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

CLC Number:

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.

Figures/Tables 13

References 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