Genesis of anhydrite in hydrothermally altered basalt from the East Pacific Rise near 13 degrees N

doi:10.1007/s13131-013-0270-z

IOCAS-IR > 海洋地质与环境重点实验室

	Genesis of anhydrite in hydrothermally altered basalt from the East Pacific Rise near 13 degrees N
	Chen, Shuai 1,2; Wang, Xiaoyuan 1; Yin, Xuebo 1; Zhang, Guoliang 1; Chen, S
	2013-02-01
发表期刊	ACTA OCEANOLOGICA SINICA
ISSN	0253-505X
卷号	32 期号:2 页码:12-17
文章类型	Article
摘要	This study reports the occurrence of anhydrite in hydrothermally altered pillow basalt (12A degrees 50.55'N, 103A degrees 57.62'W, water depth 2 480 m), which may have been produced in the basalt during seawater-basalt interaction in the laboratory. The existence of anhydrite in the altered basalt indicates extensive high-temperature hydrothermal alteration at the surface of seafloor pillow basalt. Microprobe analysis shows significant chemical zoning in the hydrothermally altered pillow basalt, in which Ca, Si and Al contents decrease and P, Fe, Mn, Cr and S contents increase from fresh basalt to altered basalt. The negative correlation between Rb-Sr and Li-Sr, and negative correlation between Li-Ca and Rb-Ca in the high-temperature vent fluids show that these fluids underwent anhydrite precipitation before fluid jetting due to mixing with seawater in the sub-seafloor. Based on these observations, we show that not all Ca in the anhydrite comes from basalt in the reaction zone, and that the basalts on the seafloor or in the upflow zone may also provide Ca for anhydrite.; This study reports the occurrence of anhydrite in hydrothermally altered pillow basalt (12A degrees 50.55'N, 103A degrees 57.62'W, water depth 2 480 m), which may have been produced in the basalt during seawater-basalt interaction in the laboratory. The existence of anhydrite in the altered basalt indicates extensive high-temperature hydrothermal alteration at the surface of seafloor pillow basalt. Microprobe analysis shows significant chemical zoning in the hydrothermally altered pillow basalt, in which Ca, Si and Al contents decrease and P, Fe, Mn, Cr and S contents increase from fresh basalt to altered basalt. The negative correlation between Rb-Sr and Li-Sr, and negative correlation between Li-Ca and Rb-Ca in the high-temperature vent fluids show that these fluids underwent anhydrite precipitation before fluid jetting due to mixing with seawater in the sub-seafloor. Based on these observations, we show that not all Ca in the anhydrite comes from basalt in the reaction zone, and that the basalts on the seafloor or in the upflow zone may also provide Ca for anhydrite.
关键词	Anhydrite Hydrothermal Alteration Pillow Basalt East Pacific Rise 13 Degrees n
学科领域	Oceanography
DOI	10.1007/s13131-013-0270-z
URL	查看原文
收录类别	SCI
语种	英语
WOS研究方向	Oceanography
WOS类目	Oceanography
WOS记录号	WOS:000314699900002
WOS关键词	MID-ATLANTIC RIDGE ; OCEANIC-CRUST ; SEAWATER INTERACTION ; CHEMICAL-EXCHANGE ; TRACE-ELEMENT ; HEAVY-METALS ; ODP SITE-801 ; VENT FLUIDS ; SEA-WATER ; 500 BARS
WOS标题词	Science & Technology ; Physical Sciences
引用统计	被引频次：1[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/16305
专题	海洋地质与环境重点实验室
通讯作者	Chen, S
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Seafloor Hydrothermal Act Lab, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
第一作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Chen, Shuai,Wang, Xiaoyuan,Yin, Xuebo,et al. Genesis of anhydrite in hydrothermally altered basalt from the East Pacific Rise near 13 degrees N[J]. ACTA OCEANOLOGICA SINICA,2013,32(2):12-17.
APA	Chen, Shuai,Wang, Xiaoyuan,Yin, Xuebo,Zhang, Guoliang,&Chen, S.(2013).Genesis of anhydrite in hydrothermally altered basalt from the East Pacific Rise near 13 degrees N.ACTA OCEANOLOGICA SINICA,32(2),12-17.
MLA	Chen, Shuai,et al."Genesis of anhydrite in hydrothermally altered basalt from the East Pacific Rise near 13 degrees N".ACTA OCEANOLOGICA SINICA 32.2(2013):12-17.

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