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Evaporation Stage of Paleo-saline Lake in the Sichuan Basin, China: Insight from Fluid inclusions in halite

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Acta Geologica Sinica(English Edition) 2020年第3期94卷 801-808页

作者： DING Ting LIU Chenglin GUO Fusheng ZHAO Yanjun WANG Mingquan CHEN Liuqin State Key Laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013China School of Earth Sciences East China University of TechnologyNanchang 330013China MLR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesCAGSBeijing 100037China China University of Geosciences Beijing 10086China

Sichuan Basin is one of the most important marine–salt forming basins in China. The Simian and Triassic have a large number of evaporites. The Triassic strata have found a large amount of polyhalite and potassium-rich brine. However, no soluble potassium salt deposit were found. In this study, the halite in well Changping 3 which is located at the eastern part of the Sichuan basin was studied using the characteristics, hydrogen and oxygen isotopes of the fluid inclusion in halite to reconstruct the paleoenvironment. The salt rocks in well Changping 3 can be divided into two types: grey salt rock and orange salt rock. The result shows that the isotopic composition of the halite fluid inclusion is distinct from the global precipitation line reflecting that the salt formation process is under strong evaporation conditions and the climate is extremely dry. At the same time, compared with the hydrogen and oxygen isotopes of brine in the Sichuan Basin and the hydrous isotope composition of the inclusions in the salt inclusions of other areas in China, it is shown that the evaporation depth of the ancient seawater in the Sichuan Basin was high and reached the precipitation of potassium and magnesium stage.

关键词： hydrogen and oxygen isotopes fluid inclusions halite Triassic Sichuan 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

Ancient Microorganisms and Carotenoids Preserved in Fluid Inclusions in halite from Chaka Salt Lake,Western China:Evidence from Micro-observation and in situ Raman Spectroscopy

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Acta Geologica Sinica(English Edition) 2021年第3期95卷 1008-1015页

作者： CHEN Yong WANG Jiuyuan ZHOU Zhenzhu CHEN Xiaolan ZHAO Zhenyu SHI Peng HAN Yun School of Geosciences China University of Petroleum(East China)QingdaoShandong 266580China Shandong Provincial Key Laboratory of Depositional Mineralization&Sedimentary Mineral Shandong University of Science and TechnologyQingdaoShandong 266590China Department of Earth and Planetary Sciences Yale UniversityNew HavenCT 06511USA PetroChina Exploration and Development Institute Beijing 100083China Bohai Oil Research Institute Tianjin Branch of CNOOC Ltd300459Tianjin 300459China

Trapped ancient microorganisms in halite fluid inclusions are of special interest to the understanding of biology and ecology in salt lake *** the integration of petrologic,microthermometric,and Raman spectroscopic analyses,this study utilizes fluid inclusions from Chaka Salt Lake,eastern Qaidam Basin,NW China,to assess the possibility of microorganism-trapping by fluid ***,we report that the solid phase of some primary fluid inclusions contains carotenoids,which is interpreted as evidence of Dunaliella algae,and that the coexisting liquid phase comprises SO_(4)^(2-).The homogenization temperatures of single-phase primary fluid inclusions indicate that the precipitation temperature of the Holocene halite in Chaka Salt Lake ranges from 13.5℃ to 36.4℃.This suggests that fluid inclusions in halite are a good medium for trapping and preserving ancient microorganisms and organic matter in salt lakes,and that Raman spectroscopy has good potential to identify halophilic archaea.

关键词： invertebrate paleontology halophile microorganisms halite fluid inclusions carotenoids Qinghai Province

PRELIMINARY STUDY ON CHLORINE-36 DATING OF halite IN SALT LAKES FROM QAIDAM BASIN

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Chinese Science Bulletin 1990年第1期35卷 32-36页

作者：黄麒 Fred M.Phillips Institute of Salt Lakes Academia Sinica Xining 810008 PRC New Mexico Institute of Mining and Technology USA

The Qaidam Basin is a large intermontane depression. It has been in existence since the Jurassic. The mean elevation of the basin floor is 2800 m. It covers an area of 120,000 km^2 with a catchment area of about 250,000 km^2. By the end of the Pliocene, great changes had taken place. Some of the lakes were evolving to the evaporite formation stage. The deposition continued through the Pliocene and the late Pleistocene to produce a sequence 2000—3000 m thick, and the total thickness of halite sequence is more than 1000 m. The Qaidam Basin contains some of the richest salt resources, the sediments deposited on

关键词： salt lake halite chlorine-36 dating.

Genesis of Polyhalite in the halite in Jialingjiang Formation of Triassic,Eastern Sichuan Basin,China

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Acta Geologica Sinica(English Edition) 2014年第S1期88卷 283-284页

作者： ZHAO Yanjun LIU Chenglin WANG Lichen DING Ting WANG Mingquan Institute of Mineral Resources Chinese Academy of Geological Sciences China University of Geosciences

Polyhalite generally formed in the early diagenetic *** is formed by the brine which rich in K+and Mg2+and adverse reaction with the gypsum,anhydrite,glauberite(Pierre,1985;Peryt et al.,2005;Leitner et al.,

关键词： polyhalite halite Jialingjiang Formation Triassic Sichuan Basin

Ordovician Seawater Composition:Evidence from Fluid Inclusions in halite

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Acta Geologica Sinica(English Edition) 2014年第S1期88卷 23-23页

作者： MENG Fanwei ZHANG Yongsheng Galamy A.R. XING Enyuan NI Pei JI Limin State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences Guangzhou Institute of Geochemistry Chinese Academy of Sciences Chinese Academy of Geological Sciences Institute of Geology and Geochemistry of Combustible Minerals NAS of Ukraine State Key Laboratory for Mineral Deposits Research Institute of Geo-Fluid Research Department of Earth ScienceNanjing University Lanzhou Institute of Geology Chinese Academy of Sciences

Fluid inclusions in halite can directly record the major composition of seawater,however Ordovician halite is very *** is a key time during the evolution *** there are no Ordovician seawater data reported except from ... 详细信息

关键词： Ordovician seawater composition fluid inclusion halite

Spatial Distribution of halite in Kuqa Basin from Paleogene to Neogene and Signification of Potash Survey

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Acta Geologica Sinica(English Edition) 2014年第S1期88卷 203-203页

作者： CAO Yangtong LIU Chenglin JIAO Pengcheng TANG Min College of Earth Science and Resources Chang'an University MLR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral Resources The First Geological Brigade Nonferrous Metals Geological and Mineral Resources Bureau

Evaporites with gigantic thickness had been developed in Kuqa Basin from Paleocene to early Miocene,and the sediment thickness changed from tens to thousands of *** 3D mine software,spatial distribution model of

关键词： Kuqa Basin halite spatial distribution model signification of potash survey

Assessment of the properties of polycrystalline rock salt synthesized under nominally dry and wet conditions

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第2期13卷 311-320页

作者： Amirsalar Moslehy Khalid Alshibli Department of Civil and Environmental Engineering University of TennesseeKnoxvilleTN37996USA

Polycrystalline rock salt’s compression is a function of applied stresses,exposure duration to the applied stresses,ambient temperature,and water *** salt’s compressional behavior under different conditions and its effects on the specimens’mechanical properties have been investigated in the ***,the one-dimensional(1D)compression behavior of polycrystalline rock salt at various water contents and how the specimen’s compression at different water contents further affects its physical and mechanical properties are not fully understood *** this study,polycrystalline rock salt specimens were prepared under nominally dry and wet conditions and some of the dry and wet specimens were annealed after the *** relationship between the porosity of the specimens and the logarithm of the applied axial stresses during the 1D compression was found to follow a linear relationship after reaching unique critical porosities of 32%and 37%for the dry and wet specimens,*** and reloading the specimens did not result in any major changes in the porosity of the *** specimens compressed under wet condition showed an average final porosity of 2.6%compared to 6.9%for the dry *** dry and wet specimens that were annealed after the compression exhibited a lower porosity in comparison to the dry and wet specimens,*** compression experiments on the specimens showed dry and wet specimens possess averaged unconfined compressive strengths(σ_(u))of 64.3 and 16.2 MPa,*** decreased σ_(u)of the dry specimens to 39.6 MPa and increased σ_(u)of the wet specimens to 41 MPa.

关键词： halite Rock salt Unconfined compression One-dimensional(1D)compression

Genetic link between saline and carbonatitic mantle fluids:The system NaCl-CaCO_(3)-MgCO_(3)±H_(2)O±Fe^(0) at 6 GPa

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Geoscience Frontiers 2022年第6期13卷 59-74页

作者： Anton Shatskiy Ivan V.Podborodnikov Anton V.Arefiev Altyna Bekhtenova Konstantin D.Litasov Vernadsky Institute of Geochemistry and Analytical Chemistry of the Russian Academy of Science Moscow 119991Russia Vereshchagin Institute for High Pressure Physics of the Russian Academy of Science TroitskMoscow108840Russia

Melt inclusions in kimberlitic minerals and diamonds indicate that chlorides are important constituents of mantle carbonatite ***,alkaline chlorides are important constituents of saline high-density fluids(HDFs)found in diamonds from kimberlites and placers around the *** compositional variations suggest that saline and carbonatitic HDFs could be genetically ***,the essence of this link remains unclear owing to the lack of data on phase relations in the chloridecarbonate systems under *** we studied subsolidus and melting phase relations in the system NaCl–CaCO_(3)–MgCO_(3)at 6 GPa and 1000–1600℃using a Kawai-type multianvil *** found that at 1000℃,subsolidus assemblage consists of halite,magnesite,and *** higher temperatures,the stabilization of dolomite splits the subsolidus area into two partial ternary fields:halite+magnesite+dolomite and halite+dolomite+*** minimum on the liquidus surface corresponds to the halite-dolomite-aragonite ternary eutectic,situated at 1100℃.The eutectic melt has Ca#89 and contains 30 wt.%Na Cl(26 mol%2NaCl).The system has two ternary peritectics:halite+dolomite=magnesite+liquid located near the ternary eutectic and magnesite+dolomite=Mg-dolomite+liquid situated between 1300 and 1400℃.Although under dry conditions incipient melting yields carbonatedominated melt,the addition of water facilitates the fusion of Na Cl and expands the liquid field to Na Cl-rich compositions with up to 70 wt.%Na *** obtained results favor the idea that hydrous saline melts/fluids(brines)found as inclusions in diamonds could be a lower temperature derivative of mantle carbonatite melts and disagree with the hypothesis on chloride melt generation owing to the chloridecarbonate liquid immiscibility since no such immiscibility was *** also studied the interaction of the NaCl–CaCO_(3)–MgCO_(3)system with iron metal and found that carbonate reduction produces Cbearing species(Fe^(0)

关键词： Chloride Carbonate halite Melting T-X diagram Earth’s mantle