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Sedimentary Conditions of evaporites in the Late Jurassic Xiali Formation,Qiangtang Basin：Evidence from Geochemistry Records

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Acta Geologica Sinica(English Edition) 2017年第1期91卷 156-174页

作者： SONG Chunhui ZENG Yongyao YAN Maodu FANG Xiaomin FENG Ying PAN Jiaqiu LIU Xifang MENG Qingquan HU Chunhua ZHONG Sirui School of Earth Sciences ＆ Key Laboratory of Western China's Mineral Resources of Gansu Province Lanzhou University Lanzhou 730000 China CAS Center for Excellence in Tibetan Plateau Earth Sciences ＆ Key Laboratory of Continental Collision and Plateau Uplift Institute of Tibetan Plateau Research Chinese of Academy of Sciences Beijing 100101 China Lanzhou Resources ＆ Environment Voc-Tech College Lanzhou 730000 China Institute of Mineral Resources Chinese Academy of Geological Sciences ＆ Key Laboratory of Saline Lake Resources and Environment Ministry of Land and Resources Beijing 100037 China

The Qiangtang Basin（QB）, located in the central Tibetan Plateau, is a Jurassic marine basin and one of the most important prospective salt resource belts in China. In recent decades, many outcrops of gypsiferous bed have been found in the Jurassic marine strata in the basin. Salt springs with abnormally high sodium（Na-＋） contents had been identified in the Late Jurassic Xiali Formation（Fm.） in the basin in the last years. However, to date, no potash or halite deposits have been identified in the QB. Gypsum outcrops and salt springs are very important signs in the investigation of halite and potash deposits. Therefore, the Xiali Fm. is a potentially valuable layer to evaluate for the possible presence of halite and potash deposits in the basin. However, few studies have explored the formation conditions of evaporites in the unit. Here, we present detailed geochemical records from the Yanshiping section related to the study of the formation conditions of evaporites in the Xiali Fm. of the QB. Climate proxies based on the obviously increased anion concentrations of SO4（2-） and Cl-- and the significant correlation coefficients of Ca2＋-SO42-（R = 0.985） and Na-＋-Cl--（R = 0.8974） reveal that the upper member of the Xiali Fm.（the upper Xiali Fm.） formed under an arid climate and evolved into the sulfate phase or early chloride phase. Provenance proxies based on the obviously increased K-＋ and Na-＋ ion concentrations and the significant correlation coefficient of Na-＋-Cl--（R = 0.8974） suggest that the upper Xiali Fm. featured optimal provenance conditions for the possible formation of halite deposits. The regression and the semi-closed tidal flat environment in the upper Xiali Fm. were favorable for the formation of potash and halite deposits. The low Mg-（2＋） /Ca-（2＋） values（mean value = 1.82） and significant Na-＋-Cl-- correlation coefficient（R = 0.8974） also suggest that the upper Xiali Fm. is the layer most likely to contain potential halite deposits. In addition, the macr

关键词： evaporites geochemistry Late Jurassic Xiali Formation Qiangtang Basin

Sulfur Isotope Composition of evaporites in Different Strata in the Tarim Basin

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Acta Geologica Sinica(English Edition) 2014年第S1期88卷 251-252页

作者： TAO Xiaowan LI Ming LUO Ping HE Jinyou TIAN Han PetroChina Research Institute of Petroleum Exploration & Development School of Energy Resources China University of Geosciences

Evaporite series is both an important target area looking for high-quality large potash deposits,but also one of the main types of hydrocarbon *** and drilling results indicate that five sets of evaporites were developed

关键词： Tarim Basin evaporites sulfur isotope thermochemical sulfate reaction(TSR)

A Rapid Marine Regression in the Southwestern Tarim Basin in the Latest Cretaceous:Comparison of Two Different Evaporitic Sequences in the Yarkand Basin,Xinjiang Province,China

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Acta Geologica Sinica(English Edition) 2021年第5期95卷 1714-1724页

作者： CAO Yangtong ZENG Changmin ZHANG Liang ZHU Lichun MNR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesCAGSBeijing 100037China Research Institute of Petroleum Exploration&Development Tarim Oilfield Branch CompanyChinese Petroleum CompanyKorlaXinjiang 841000China

Two different evaporitic sequences occurred in the latest Cretaceous-Early Paleocene in Yarkand Basin,southwestern Tarim Basin,Xinjiang Province,China:one is characterized by poor gypsum and some small,lenticularshaped halite layers in the Tuyiluoke Formation of the latest Cretaceous,the other is characterized by very thick gypsum and halite layers in the Aertashen Formation of the early *** the early developmental stage of the Tuyiluoke Formation,the Yarkand ancient saline lake was a long,strip-shaped depression,NW-SE oriented,along the West Kunlun piedmont,with its eastern boundary to the line along bores Ys1-T1-Ks101,the concentrated center located in the area of borehole *** the later developmental stage,the depositional scope was shifted inch by inch to the NW of this saline lake,forming a triangular depositional area,with apices at boreholes Wx1,Ak2 and S1,the concentrated center of the saline lake gradually migrating from borehole S1 region to the northwestern area of the lake,developing four small,evaporatedconcentrated sub-depressions,depositing lenticular-shaped *** the early Paleocene,the ancient saline lake was stretched from the West Kunlun piedmont in the west,to the Markit slope in the east,from the South Tianshan piedmont in the north,to the Hotan area in the south,accompanied by giant thicknesses of halite and large-scale gypsum layers,mainly interbedded with limestone in the Aertashen *** evaporites in the latest Cretaceous-early Paleocene were controlled by the marine transgression-regression geological background in the Yarkand ***,integrated evaporitic depositional sequences,such as clasolite-gypsum-halite-potash,usually occur in the presence of persistent seawater through evaporation,but this is not the case in the Tuyiluoke *** contrast,very thick gypsum layers are common in the early ***,adequate mineral sources for evaporites are found within seawater,such as in large basins und

关键词： marine regression episode evaporites latest Cretaceous–Early Paleocene Yarkand Basin

Origin of Halite in the Lanping–Simao Basin,Southeastern Tibetan Plateau,China:Evidence from Sr and Cl Isotopes

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Acta Geologica Sinica(English Edition) 2022年第6期96卷 2028-2039页

作者： DU Shaorong ZHENG Mianping LÜYuanyuan ZHANG Yongsheng ZHANG Xuefei MIAO Zhongying LI Mingming MLR Key Laboratory of Saline Lake Resources and Environments Institute of Mineral ResourcesChinese Academy of Geological Sciences(CAGS)Beijing 100037China College of Geoscience and Surveying Engineering China University of Mining and Technology(Beijing)Beijing 100083China

The Lanping−Simao Basin is located on the southeastern Tibetan Plateau,China,and contains massive *** origin of evaporites in the basin has been hotly debated because of the strong transformation by tectonic *** halite samples from borehole MK-3 in the Mengyejing area of the basin were collected and analyzed using XRD,Cl-Sr isotopes and chemical compositions to trace the origin of the evaporites in the *** Br×10^(3)/Cl ratios of the halite samples are between 0 and 0.55,most of which are synchronized with the law of seawater evaporation and at the stage of halite precipitation from seawater,indicating that the evaporites are mainly of marine ***^(87)Sr/^(86)Sr ratios range from 0.707489 to 0.711279;after correction,the^(87)Sr/^(86)Sr 145 Ma ratios range from 0.704721 to 0.707611,equivalent with the 87Sr/86Sr ratios of seawater at 145 Ma,indicating a marine *** decay of 87Rb in the evaporite during deposition,change of the depositional environment and the unsealed environment at a later period resulted in the present^(87)Sr/^(86)Sr ratios of some samples being *** δ^(37)Cl value compositions range from−0.38‰to 0.83‰,which is consistent with the δ^(37)Cl value composition of the world marine halite(−0.6‰to 0.4‰),further confirming that seawater is the main *** addition,the high δ^(37)Cl value of some samples at the boundary of the upper and lower evaporite layers might be related to the influence of δ^(37)Cl-rich brine and the incomplete dissolution of the halite.

关键词： evaporites halite potash Cl-Sr isotopes Lanping-Simao Basin

He-Ar-S-Pb Isotopic Compositions of Pyrite：Constraints on the Source of Ore-forming Materials of the Chengchao Skarn Iron Deposit,SE Hubei Province,Eastern China

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Acta Geologica Sinica(English Edition) 2016年第5期90卷 1780-1794页

作者： LI Wei XIE Guiqing ZHU Qiaoqiao Faculty of Earth Resources China University ofGeosciences Wuhan 430074 China Institute of Mineral Resources Chinese Academy of Geological Sciences Beijing 100037 China MLR Key Laboratory of Metallogeny and Mineral Assessment Beijing 10003 7 China

The Chengchao iron deposit,the largest high-grade skarn iron deposit in southeastern Hubei Province,contains considerable amounts of magnetite and by-product *** obtain better understanding of the ore-formation process,this study carried out He-Ar-S-Pb multi-isotopic analyses on the pyrites formed during two stages of *** results indicate that the δ34S values（ranging from 14.0‰ to 17.6‰） of pyrites formed from the two stages have no obvious differences,suggesting that they were not derived from a single magmatic sulfur *** δ34S values of anhydrite mostly range from 21.9‰ to 28.4‰,similar to that of the Middle Triassic sedimentary anhydrite in the Middle-Lower Yangtze River metallogenic belt（MLYRB）.The Pb isotopic compositions of the pyrites of both stages are homogeneous,with values of 208Pb/204Pb,207Pb/204Pb,and-206Pb/204Pb being 38.006-38.257,15.523-15.556,and 17.806-18.052,respectively,indicating a mixed crust-mantle *** He-Ar results exhibit different compositions of the two stages：the -3He/-4He（R/Ra） and 40Ar/-36Ar values for the early-stage pyrite are 0.46-0.63 and 311-322,respectively,whereas the values for late-stage pyrite are 0.23-0.34 and 305-361,*** stages of pyrites indicate the multiple sources of the ore-forming fluids,with decreasing amount of magmatic water and increasing amount of modified meteoric water（MASW） during fluid *** Triassic evaporites played an important role in the mineralization process.

关键词： He-Ar-S-Pb isotopes evaporites mineralization Chengchao skarn Fe deposit southeastern Hubei Province

Characteristics, formation and evolution of pre-salt dolomite reservoirs in the fifth member of the Ordovician Majiagou Formation, mid-east Ordos Basin, NW China

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Petroleum Exploration and Development 2019年第6期46卷 1153-1164页

作者： FU Siyi ZHANG Chenggong CHEN Hongde CHEN Anqing ZHAO Junxing SU Zhongtang YANG Shuai WANG Guo MI Wentian State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of TechnologyChengdu 610059China Institute of Sedimentary Geology Chengdu University of TechnologyChengdu 610059China School of Mines Inner Mongolia University of TechnologyHohhot 010051China

The characteristics and formation of the pre-salt dolomite reservoirs in the fifth member of Ordovician Majiagou Formation in the mid-east Ordos Basin are investigated through observation of cores and thin sections,and geochemical analysis.(1)The pre-salt dolomites can be divided into dolomicrite,grain dolomite and dolarenite,in which the main reservoir space consists of intercrystalline pores and various dissolved pores.(2)The diagenesis in the study area is complex and mainly includes dolomitization,dissolution,filling,and recrystallization.(3)Multi-stages of dolomitization,including penecontemporaneous capillary concentration dolomitization,seepagereflux dolomitization during penecontemporaneous and shallow burial stage,and burial dolomitization in later stage,are conducive to the preservation of primary pores and development of secondary pores.(4)Multi-stages of dissolution also have strong influence on the development of secondary pores;the secondary transgression and regression cycles during the contemporaneous-penecontemporaneous stage led to exposure and dissolution of soluble minerals and thus the generation of secondary pores.(5)In the burial stage,reservoir pores were further improved due to organic acid dissolution and the dissolution by hydrosulphuric acid from thermochemical sulfate reduction(TSR)and its product H2S.(6)High H2S concentration area in pre-salt reservoirs can thus be considered as targets for future exploration.

关键词： Ordos Basin Ordovician Majiagou Formation dolomite evaporites dolomitization dissolution

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Microbial dolomite model for the dolomite formation of the Middle Cambrian in the Tarim Basin,Northwest China

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Microbial dolomite model for the dolomite formation of the M...

A Comparative Analysis of Evaporite Deposition on Earth and Mars

2015年全国沉积学大会

作者： Xuelian You Shu Sun Jingquan Zhu Qing Li Wenqiang Jia Ling Liu Junying Tan School of Ocean Sciences China University of Geosciences Institute of Geology and Geophysics Chinese Academy of Sciences College of Geosciences China University of Petroleμm

The dolomite formation of the Middle Cambrian is associated with evaporites in Tarim Basin, and the origin of this dolomite was used to be Sabkha-style dolomite during Syndepositional period. Nevertheless, a link between microbial activity and dolomite formation in the sabkha of Abu Dhabi has been evaluated, even though this environment is cited frequently as the type analogue for many ancient evaporitic sequences. Based on a geomicrobiologic investigation of the dolomite formation of the Middle Cambrian, sedimentary microfacies in details are an ancient analogue for the sabkha environment of Abu Dhabi. High resolution scanning electron microscope observations on this dolomite formation revealed that,1. dolomite spheroids with a diameter of 120 to 150 nm does not represent an isolated observation,but a recurrent phenomenon which can be observed widely in different samples of stromatolites developed in subtidal and sabkha envirnments, which formed dμmbbell-shaped or chain morphology. There are also spherical dolomites with less than 100 nm, which are clustered. 2. Spherical dolomites in diameter of 143 nm and pores in the same diameter are distributed on the crystal surface of dolomite. The uniform distribution pattern of spheroids and pores are resulted from extracellular polymeric substances as a organic substrates and templates for dolomite nucleation. The sabkha of Abu Dhabi as the type analogue for the MiddleCambrian dolomite in the Tarim Basin is helpful to understand the mechanism and the microbial origin in geological records. The microbial dolomite model for the dolomite formation of the Middle Cambrian in the Tarim Basin, Northwest China, is similar to the modern analogue of sabkha because EPS played a important role for the precipitation of dolomite.

关键词： Tarim Basin the Middle Cambrian evaporites microbial dolomite model

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Abstracts of Chinese Geological Literature 2015年第2期31卷 1-页

作者： Zheng Mianping Kong Weigang Institute of Mineral Resources Chinese Academy of Geological Sciences

In this paper,the authors give a brief review of recent observations and studies on Martian *** the basis of the comparison of salt sediments on Earth and Mars,the authors propose that potassium salts might be widespr... 详细信息

关键词： evaporites Mars