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Origin and palaeoenvironmental indications of Eocene to Oligocene primary lacustrine dolomite, Northern Tianshan Mountains, NW China
Wang, Yizhe1,2; Wu, Chaodong1,2; Fang, Yanan (房亚南)3; Ma, Jian1,4; Shen, Bing1; Huang, Fang5; Zhou, Tianqi1,2; Wang, Jialin1; Zhang, Wei6
2020-08-15
Source PublicationJOURNAL OF ASIAN EARTH SCIENCES
ISSN1367-9120
Volume198Pages:19
Abstract

During the Eocene to Oligocene, lacustrine dolostone developed in the Anjihaihe Formation on the northern margin of the Tianshan Mountains in the southern Junggar Basin. Dolostone formation is usually restricted to specific environmental and geochemical conditions; therefore, dolostone contains considerable information on palaeoenvironment and palaeoclimate changes. Furthermore, this dolostone provides more information on the formation process and formation mechanisms of dolostone. The studied dolostone is white to greyish white and consists of dolomite crystals that are 3-10 mu m in size, homogeneous, subhedral to euhedral and nearly stoichiometric (with average Mg/Ca molar ratios of 0.97). The high Sr content (average 1996 ppm), relatively high delta O-18 values (average -1.8%) and co-occurrence with halite and gypsum reflect evaporative and saline conditions. The delta Mg-26 values of the dolostone range from -0.81 to -2.44%, with a mean of -1.78%. Strong positive correlations exist between the delta Mg-26 values and depth (r = 0.76) and the Mg isotope Rayleigh distillation model results, which indicates that delta Mg-26 fractionation occurred in conjunction with evaporation and that most of the Anjihaihe lacustrine dolomite developed in a natural environment at 25-50 degrees C. Moreover, evidence of microbes can be found covering the surface of the dolostone in the presence of a few framboids of pyrite. Additionally, clay layers in the dolostone are primarily composed of bentonite (40-60%) but also contain small amounts of montmorillonite (0.8-3.5%) and zeolite (0.1-0.5%). Detrital zircon ages of 40-44 Ma are presented for the first time for the Anjihaihe Formation. The results show that understanding the primary lacustrine dolostone is significant and essential to reconstructing the evolution of palaeoenvironments and synsedimentary volcanic activity in the northern Tianshan Mountains during the Eocene to Oligocene. This work also provides a possible model that explains the formation of the studied dolostone in an evaporative saline lacustrine environment.

KeywordTianshan Mountains Saline lake Primary lacustrine dolostone Mg isotope Palaeoenvironments Volcanic activity
DOI10.1016/j.jseaes.2019.104135
Indexed BySCI
Language英语
WOS KeywordMAGNESIUM-ISOTOPE FRACTIONATION ; PERMIAN FENGCHENG FORMATION ; ORDOVICIAN K-BENTONITES ; SOUTHERN JUNGGAR BASIN ; MG ISOTOPES ; TIEN-SHAN ; MICROBIAL MEDIATION ; TECTONIC EVOLUTION ; NORTHWEST CHINA ; MADRID BASIN
Funding ProjectNational ST major project[2017ZX05008-001]
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000546699600004
Funding OrganizationNational ST major project
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/32111
Collection中国科学院南京地质古生物研究所
Corresponding AuthorWu, Chaodong
Affiliation1.Peking Univ, Sch Earth & Space Sci, Key Lab Orogen Belt & Crustal Evolut, Minist Educ, Beijing 100871, Peoples R China
2.Peking Univ, Inst Oil & Gas, Beijing 100871, Peoples R China
3.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Key Lab Econ Stratig & Palaeogeog, Nanjing 210008, Peoples R China
4.MIT, Dept Earth Atomospher & Planetary Sci, 77 Massachusetts Ave, Cambridge, MA 02139 USA
5.Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Peoples R China
6.China Univ Petr, Coll Geosci, Beijing 102249, Peoples R China
Recommended Citation
GB/T 7714
Wang, Yizhe,Wu, Chaodong,Fang, Yanan ,et al. Origin and palaeoenvironmental indications of Eocene to Oligocene primary lacustrine dolomite, Northern Tianshan Mountains, NW China[J]. JOURNAL OF ASIAN EARTH SCIENCES,2020,198:19.
APA Wang, Yizhe.,Wu, Chaodong.,Fang, Yanan .,Ma, Jian.,Shen, Bing.,...&Zhang, Wei.(2020).Origin and palaeoenvironmental indications of Eocene to Oligocene primary lacustrine dolomite, Northern Tianshan Mountains, NW China.JOURNAL OF ASIAN EARTH SCIENCES,198,19.
MLA Wang, Yizhe,et al."Origin and palaeoenvironmental indications of Eocene to Oligocene primary lacustrine dolomite, Northern Tianshan Mountains, NW China".JOURNAL OF ASIAN EARTH SCIENCES 198(2020):19.
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