Mineralogical, crystallographic, and isotopic constraints on the precipitation of aragonite and calcite at Shigiang and other hot springs in Yunnan Province, China

doi:10.1016/j.sedgeo.2016.09.007

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	Mineralogical, crystallographic, and isotopic constraints on the precipitation of aragonite and calcite at Shigiang and other hot springs in Yunnan Province, China
	Jones, Brian 2; Peng, Xiaotong1
刊名	SEDIMENTARY GEOLOGY
	2016-11-01
卷号	345 页码:103-125
关键词	Hot Springs Calcite Aragonite Opal-a Isotopes Dendrites
DOI	10.1016/j.sedgeo.2016.09.007
文献子类	Article
英文摘要	Two active spring vent pools at Shiqiang (Yunnan Province, China) are characterized by a complex array of precipitates that coat the wall around the pool and the narrow ledges that surround the vent pool. These precipitates include arrays of aragonite crystals, calcite cone-dendrites, red spar calcite, unattached dodecahedral and rhombohedral calcite crystals, and late stage calcite that commonly coats and disguises the earlier formed precipitates. Some of the microbial mats that grow on the ledges around the pools have been partly mineralized by microspheres that are formed of Si and minor amounts of Fe. The calcite and aragonite that are interspersed with each other at all scales are both primary precipitates. Some laminae, for example, change laterally from aragonite to calcite over distances of only a few millimetres. The precipitates at Shiqiang are similar to precipitates found in and around the vent pools of other springs found in Yunnan Province, including those at Gongxiaoshe, Zhuyuan, Eryuan, and Jifei. In all cases, the delta D-water and delta(18)O(wate)r indicate that the spring water is of meteoric origin. These are thermogene springs with the carrier CO2 being derived largely from the mantle and reaction of the waters with bedrock. Variations in the delta C-13(travertine) values indicate that the waters in these springs were mixed, to varying degrees, with cold groundwater and its soil-derived CO2. Calcite and aragonite precipitation took place once the spring waters had become supersaturated with respect to CaCO3, probably as a result of rapid CO2 degassing. These precipitates, which were not in isotopic equilibrium with the spring water, are characterized by their unusual crystal morphologies. The precipitation of calcite and aragonite, seemingly together, can probably be attributed to microscale variations in the saturation levels that are, in turn, attributable to microscale variations in the rate of CO2 degassing. (C) 2016 Elsevier B.V. All rights reserved.
WOS关键词	REHAI GEOTHERMAL-FIELD ; BRITISH-WEST-INDIES ; KENYA RIFT-VALLEY ; SOUTHWESTERN CHINA ; LAKE BOGORIA ; DEPOSITIONAL FACIES ; GRAND CAYMAN ; NEW-ZEALAND ; FRACTIONATION ; OXYGEN
语种	英语
WOS记录号	WOS:000388152700007
内容类型	期刊论文
源URL	[http://ir.idsse.ac.cn/handle/183446/1659]
专题	专家咨询委员会
作者单位	1.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China 2.Univ Alberta, Dept Earth & Atmospher Sci, Edmonton, AB T6G 2E3, Canada
推荐引用方式 GB/T 7714	Jones, Brian,Peng, Xiaotong. Mineralogical, crystallographic, and isotopic constraints on the precipitation of aragonite and calcite at Shigiang and other hot springs in Yunnan Province, China[J]. SEDIMENTARY GEOLOGY,2016,345:103-125.
APA	Jones, Brian,&Peng, Xiaotong.(2016).Mineralogical, crystallographic, and isotopic constraints on the precipitation of aragonite and calcite at Shigiang and other hot springs in Yunnan Province, China.SEDIMENTARY GEOLOGY,345,103-125.
MLA	Jones, Brian,et al."Mineralogical, crystallographic, and isotopic constraints on the precipitation of aragonite and calcite at Shigiang and other hot springs in Yunnan Province, China".SEDIMENTARY GEOLOGY 345(2016):103-125.