An Early Holocene Primary Dolomite Layer of Abiotic Origin in Lake Sayram, Central Asia

	An Early Holocene Primary Dolomite Layer of Abiotic Origin in Lake Sayram, Central Asia
	Cheng, Jianru; Meng, Xianqiang; Zhang, Enlou; Jiang, Qingfeng; Ni, Zhenyu; Ji, Junfeng
刊名	GEOPHYSICAL RESEARCH LETTERS
	2021
卷号	48 期号:23
英文摘要	The dolomite problem is a long-standing puzzle in sedimentology and mineralogy. Previous studies have shown that some dolostones are formed by microbes or in hydrothermal-burial environments. Here, we provide a different case in which an abiotic and Ca-rich dolomite layer precipitated in Lake Sayram, Central Asia, during the early Holocene. The 12-cm-thick layer consists of abundant partially ordered dolomite crystals (mean > 50 wt% and maximum = 81 wt%) which have euhedral and rhombohedral shapes and weak cation ordering. Transmission electron microscopy reveals that even in a single crystal, compositions vary among different domains. Mineralogical and isotopic evidence suggests that these dolomites are of primary and abiotic origin. We infer that this dolomite layer might be the product of day and night temperature cycling of shallow lake water under local warming trend. This study provides evidence for abiotic dolomites forming at ambient temperature.
内容类型	期刊论文
源URL	[http://159.226.73.51/handle/332005/20298]
专题	中国科学院南京地理与湖泊研究所
推荐引用方式 GB/T 7714	Cheng, Jianru,Meng, Xianqiang,Zhang, Enlou,et al. An Early Holocene Primary Dolomite Layer of Abiotic Origin in Lake Sayram, Central Asia[J]. GEOPHYSICAL RESEARCH LETTERS,2021,48(23).
APA	Cheng, Jianru,Meng, Xianqiang,Zhang, Enlou,Jiang, Qingfeng,Ni, Zhenyu,&Ji, Junfeng.(2021).An Early Holocene Primary Dolomite Layer of Abiotic Origin in Lake Sayram, Central Asia.GEOPHYSICAL RESEARCH LETTERS,48(23).
MLA	Cheng, Jianru,et al."An Early Holocene Primary Dolomite Layer of Abiotic Origin in Lake Sayram, Central Asia".GEOPHYSICAL RESEARCH LETTERS 48.23(2021).