南海IODP 349航次基底玄武岩中碳酸盐岩脉的岩石学特征*

doi:10.11978/2018007

Abstract

Abstract:

The basaltic basement in the South China Sea was cored for the first time during International Ocean Discovery Program (IODP) Exp 349. The basalt was collected from Sites U1431 and U1433 close to the fossil spreading ridge in East and Southwest Sub-basins, respectively. Carbonate veins (n=16) within the basalt were investigated under microscope and by the laser Raman spectra. At Site U1431, the carbonate veins consisted of calcite veins or aragonite veins, while at Site U1433 the carbonate veins are composed of either calcite veins, or aragonite veins, and calcite-aragonite mixed veins. Meanwhile, the calcite veins and aragonites alternated, and at ~42.1 m below basement, two calcite veins and one aragonite vein occurred parallel, likely indicating that multiple hydrothermal fluids of different sources have circulated there. At both sites, the textures of aragonite are generally the same-blocky, fibrous, and radiating fibers. However, it is not the case for calcite. At Site U1431, the calcite is clotted blocky, blocky, granule, and fibrous, while at Site U1433 the calcite only occur as blocks. The abundance of carbonate veins at Site U1431 is much higher than that at Site U1433. These suggest that the low-temperature hydrothermal circulation at Site U1431 is stronger than that at Site U1433. Different local geology and environment mostly lead to the differences in hydrothermal activity at these two sites: Site U1431 is close to a giant seamount that serves as a recharge site, while Site U1433 is far away from any recharge or discharge site.

Key words: carbonate veins, Laser Raman spectra, calcite, aragonite, low temperature hydrothermal fluid flow, South China Sea, IODP Exp349

CLC Number:

P578.6

Jiarui XU, Yifeng CHEN, Baoyun WANG. Petrography of carbonate veins in basement basalts from the South China Sea Exp. 349[J].Journal of Tropical Oceanography, 2018, 37(6): 63-73.

Figures/Tables 9

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Tab. 1

Raman shifts of carbonate minerals from the South China Sea"

岩脉编号		深度/mbsf	基底深度/m	碳酸盐矿物结构	矿物相	晶格振动
岩脉编号		深度/mbsf	基底深度/m	碳酸盐矿物结构	矿物相	平动	摆动	面内弯曲振动	对称伸缩振动	反对称伸缩振动*	面外弯曲振动*
U1431E-	39R-1-W, 10-13	910.12	20.41	块状	文石	153	206	706	1086	1463	/
	41R-2-W, 43-47	925.38	35.67	斑块状	方解石	155	283	713	1088	/	/
	41R-2-W, 43-47	925.38	35.67	粒状	方解石	154	282	713	1089	/	/
	41R-5-W, 21-23	928.67	38.96	纤维状/放射纤维状	文石	153	206	703	1085	1463	/
	41R-5-W, 21-23	928.67	38.96	粒状	文石	153	206	704	1086	/	/
	41R-7-W, 65-71	931.84	42.13	纤维状	方解石	155	282	713	1087	/	1749
				纤维状/放射纤维状	文石	154	206	706	1085	1463	/
				块状	文石	153	207	706	1086	/	/
	42R-4-W, 31-35	937.66	47.95	块状	方解石	156	284	713	1088	/	1749
	42R-4-W, 31-35	937.66	47.95	斑块状	方解石	153	282	712	1087	/	1749
	43R-2-W, 74-77	944.66	54.94	块状	方解石	155	283	713	1087	/	/
	46R-3-W, 114-118	976.16	86.45	块状	方解石	154	283	713	1087	1438	/
	47R-5-W, 5-9	987.22	97.51	块状/放射纤维状	文石	152	205	705	1084	1463	/
	49R-2-W, 136-138	993.88	104.17	纤维状	方解石	155	282	713	1087	1438	1749
	49R-2-W, 136-138	993.88	104.17	粒状	方解石	156	283	712	1088	/	/
	50R-3-W, 6-10	1003.80	114.09	纤维状	方解石	155	282	713	1087	1438	1749
U1433B-	66R-1-W, 63-65	805.84	10.34	块状	方解石	155	282	713	1087	/	1749
				纤维状	文石	152	206	705	1084	/	/
				块状	文石	153	206	705	1084	/	/
	66R-4-W, 11-16	809.38	13.88	块状	文石	152	206	704	1084	1461	/
	66R-4-W, 109-114	810.36	14.86	块状	方解石	155	281	712	1087	1437	1749
				块状	文石	152	206	704	1084	1461	/
				纤维状/放射纤维状	文石	152	205	704	1084	/	/
	68R-1-W, 86-90	820.58	25.08	块状	方解石	155	283	713	1087	/	/
	68R-1-W, 86-90	820.58	25.08	放射纤维状/块状	文石	152	206	705	1084	/	/
	75R-1-W, 120-122	854.91	59.41	块状	方解石	155	282	713	1087	/	/
	75R-3-W, 31-34	856.13	60.63	块状	方解石	155	282	713	1087	1437	1749

Tab. 1

Fig. 6

Fig. 7

Fig. 8

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Petrography of carbonate veins in basement basalts from the South China Sea Exp. 349

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