Mg, C and O isotopic compositions of Late Cretaceous lacustrine dolomite and travertine in the northern Tianshan Mountains, Northwest China

doi:10.1016/j.chemgeo.2020.119569

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	Mg, C and O isotopic compositions of Late Cretaceous lacustrine dolomite and travertine in the northern Tianshan Mountains, Northwest China
	Wang, Yizhe 1,2; Wu, Chaodong 2; Fang, Yanan 3; Ma, Jian 2,4; Shen, Bing 2; Huang, Fang 5; Li, Linlin 6; Ning, Meng 2; Zhai, Lina 7; Zhang, Wei 8
	2020-05-20
发表期刊	CHEMICAL GEOLOGY
ISSN	0009-2541
卷号	541 页码:19
通讯作者	Wu, Chaodong([email protected])
摘要	The Junggar Basin was characterized by high temperature and strong tectonic activities during the Late Cretaceous, in which a dolomite-forming lacustrine depositional system associated with travertine was deposited in its southern sector adjoining the northern Tianshan Mountains. Two broad types of dolomite are identified in terms of mineralogy, including the homogeneous and anhedral dolomite-A and high order degree and euhedral dolomite-B, which are also largely varied in mineral size (10-20 mu m and 30-50 mu m in size, respectively). The dolomites display a low degrees of dolomite order (mean = 0.48) and Ca-rich (mean = 55.8). Compared with delta O-18 values (PDB) of limestones in the shore to shallow facies (-7.0 to -11.1 parts per thousand), the apparent positive delta O-18 values of dolomites (-4.2 to -5.9 parts per thousand) indicate a stronger evaporation environment, while the values of -6.8 to -8.1 parts per thousand in the salt marsh facies dolomitic limestone may reflect transitional conditions. Moreover, the more positive delta Mg-26 values of dolomites (ranging from -1.52 to -2.91 parts per thousand) than those of limestone and travertine (-3.58 parts per thousand and -4.31 parts per thousand, respectively) also indicate an origin related fractionation effect. In addition, based the occurrence of low-temperature hydrothermal minerals, including chlorite, barite, siderite and silver in the dolostone and travertine, we interpret a new travertine-related origin for the lacustrine dolomite. Thermal water entering saline and alkaline lake environments subject to strong evaporation promoted dolomitization. From the simulation of the Rayleigh and seepage reflux models, we speculate that the lacustrine dolomites formed in a near-surface environment (25-50 degrees C). Moreover, the results contain abundant information on palaeoenvironmental and palaeoclimatic changes, which are very important for reconstructing and deciphering palaeoenvironments and expanding the dolomitization model under thermal water influenced evaporative lacustrine conditions.
关键词	Tianshan Mountains Lacustrine dolomite Travertine Mg isotope Thermal water Dolomitization model
DOI	10.1016/j.chemgeo.2020.119569
收录类别	SCI
语种	英语
资助项目	National ST major project[2017ZX05008-001]
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000537202100002
出版者	ELSEVIER
引用统计	被引频次：13[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/337002/167549
专题	中国科学院海洋研究所
通讯作者	Wu, Chaodong
作者单位	1.Lanzhou City Univ, Bailie Sch Petr Engn, Lanzhou 730070, Peoples R China 2.Peking Univ, Sch Earth & Space Sci, Key Lab Orogen Belt & Crustal Evolut, Minist Educ, Beijing 100871, Peoples R China 3.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Nanjing 210008, Peoples R China 4.MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA 5.Univ Sci & Technol China, Sch Earth & Space Sci, Hefei 230026, Peoples R China 6.China Earthquake Adm, Inst Crustal Dynam, Beijing 100085, Peoples R China 7.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 8.China Univ Petr, Coll Geosci, Beijing 102249, Peoples R China
推荐引用方式 GB/T 7714	Wang, Yizhe,Wu, Chaodong,Fang, Yanan,et al. Mg, C and O isotopic compositions of Late Cretaceous lacustrine dolomite and travertine in the northern Tianshan Mountains, Northwest China[J]. CHEMICAL GEOLOGY,2020,541:19.
APA	Wang, Yizhe.,Wu, Chaodong.,Fang, Yanan.,Ma, Jian.,Shen, Bing.,...&Zhang, Wei.(2020).Mg, C and O isotopic compositions of Late Cretaceous lacustrine dolomite and travertine in the northern Tianshan Mountains, Northwest China.CHEMICAL GEOLOGY,541,19.
MLA	Wang, Yizhe,et al."Mg, C and O isotopic compositions of Late Cretaceous lacustrine dolomite and travertine in the northern Tianshan Mountains, Northwest China".CHEMICAL GEOLOGY 541(2020):19.

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