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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, Yizhe1,2; Wu, Chaodong2; Fang, Yanan3; Ma, Jian2,4; Shen, Bing2; Huang, Fang5; Li, Linlin6; Ning, Meng2; Zhai, Lina7; Zhang, Wei8
2020-05-20
Source PublicationCHEMICAL GEOLOGY
ISSN0009-2541
Volume541Pages:19
Abstract

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.

KeywordTianshan Mountains Lacustrine dolomite Travertine Mg isotope Thermal water Dolomitization model
DOI10.1016/j.chemgeo.2020.119569
Indexed BySCI
Language英语
WOS KeywordTIEN-SHAN-RANGE ; JUNGGAR BASIN ; COORONG REGION ; PALEOENVIRONMENTAL SIGNIFICANCE ; PALUSTRINE CARBONATES ; TECTONIC EVOLUTION ; WESTERN ANATOLIA ; DOLOMITIZATION ; FRACTIONATION ; LAKE
Funding ProjectNational ST major project[2017ZX05008-001]
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000537202100002
Funding OrganizationNational ST major project
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/31916
Collection中国科学院南京地质古生物研究所
Corresponding AuthorWu, Chaodong
Affiliation1.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
Recommended Citation
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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