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Genesis of the Shijia Gold Deposit， Jiaodong Peninsula， China: Constraints from Fluid Inclusions and Stable Isotopes

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Journal of earth Science 2024年

作者： Liqiang Feng Ruiwen Shen Xuexiang Gu Yongmei Zhang Zhanlin Ge Yingshuai Zhang Yu He Natural Resources Comprehensive Survey Command Center China Geological Survey Ha'erbin Natural Resources Survey Command Center China Geological Survey School of earth Sciences and Resources， China University of Geosciences State Key laboratory of Geological Processes and Mineral Resources， China University of Geosciences Beijing Xi'an Mineral Resources Survey Center China Geological Survey department of Natural Resources of Liangshan Yi Autonomous Prefecture

The Shijia gold deposit， situated in Penglai City， Shandong Province， is distinguished by its fracture-filling auriferous quartz-sulfide veins. studies of fluid inclusions and stable isotopes （H-O-C-S） were conducted on this deposit， revealing that the auriferous quartz primarily contains four types of fluid inclusions: CO2-H2O inclusions， pure CO2inclusions， two-phase aqueous inclusions， and solid mineral-bearing multiphase inclusions. The ore-forming fluids of Shijia belong to a heterogeneous H2O-CO2-NaCl system， characterized by moderate to high temperatures （187–386 ℃）， low to high salinities (0.2%–41.2% NaCleq)， and low densities (0.72–1.07 g/cm3). Fluid immiscibility and fluid-rock interaction may have occurred at Shijia， with mineralization depths ranging from 3.3 to 3.9 km. The δD and δ18OH2Ovalues of auriferous quartz vary from -86.1‰ to -79.1‰ and from 9.4‰ to 10.5‰， respectively， suggesting that the ore-forming fluids are of magmatic origin. Carbon isotope compositions of the hydrothermal calcite （-3.31‰ to -0.86‰） indicate the carbon might be related to a mantle source that was contaminated by marine carbonates. The positive δ34S values of sulfides （4.3‰–7.3‰） reflect that the ore-forming materials may be sourced from the metasomatized lithospheric mantle beneath the North China Craton， related to the subduction of the Yangtze Craton in the Triassic. Collectively， the evidence from geology， fluid inclusion and H-O-C-S isotopes indicate that the Shijia gold deposit is of magmatic-hydrothermal origin and related to the Guojialing granite formed by the mixing of crust- and mantle-derived magmas.

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Geochemical Characteristics and Source of Ore-Forming Fluid of Duolanasayi Gold Deposit, Xinjiang

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Chinese Journal Of Geochemistry 2003年第1期22卷 74-82页

作者：肖惠良周济元王鹤年董永观季俊峰赵宇 State Key laboratory for Mineral Deposits Research Department of Earth Sciences Nanjing University Nanjing Institute of geology and Mineral Resources

The Duolanasayi gold deposit, 60 km NW of Habahe County in Xinjiang, is a medium-large scale gold deposit controlled by the coupled ore-forming processes involving brittle-ductile shearing, albitite veins, and post-stage magma solution. Fluid inclusion studies indicate that the homogenization temperatures range from 160℃ to 315℃ with the peak values of 220-300℃. Mineralization pressures are from 21.0 MPa to 64.5 MPa. Ore fluid inclusions contain Ca 2+, K+, Na+, Mg 2+; HCO- 3, SO 2- 4, HS-, F-, Cl- and Au+ ( maximum: 5.3×10 -6), and the mineralizing fluid is a H 2O-CO 2 system. Sulfur, hydrogen, oxygen and strontium isotopic compositions (δS= -2.46‰- -7.02‰, δ 18O H 2O= 1.65‰- 12.4‰, δD= -132.2‰- -51.8‰, (Sr/Sr) i= 0.7043- 0.7073) suggest that the ore-forming fluid is the mixture of magmatic water, meteoric water, metamorphic water and formation water sealed in rocks and strata. It is mainly magmatic water in the early stage, and mixing fluid of water, meteoric water, metamorphic water and formation water that occurred in rocks and strata in the major mineralization stage. The ore-forming materials were derived from the upper mantle or lower crust.

关键词：流体包裹体地质学金矿床新疆地球化学特征成矿作用矿床成因

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Where were the monsoon regions and arid zones in Asia prior to the Tibetan Plateau uplift?

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National Science Review 2015年第4期2卷 403-416页

作者： Xiaodong Liu Qingchun Guo Zhengtang Guo Zhi-Yong Yin Buwen Dong Robin Smith State Key laboratory of Loess and Quaternary geology Institute of Earth Environment Chinese Academy of Sciences CAS Center for Excellence in Tibetan Plateau earth Sciences University of the Chinese Academy of Sciences Key laboratory of Cenozoic geology and Environment Institute of Geology and Geophysics Chinese Academy of Sciences department of Environmental & Ocean Sciences University of San Diego National Centre for Atmospheric Science University of Reading

The impact of the Tibetan Plateau uplit on the Asian monsoons and inland arid climates is an important but also controversial question in studies of paleoenvironmental change during the Cenozoic. In order to achieve a good understanding of the background for the formation of the Asian monsoons and arid environments, it is necessary to know the characteristics of the distribution of monsoon regions and arid zones in Asia before the plateau uplit. In this study, we discuss in detail the paterns of distribution of the Asian monsoon and arid regions before the plateau uplit on the basis of modeling results without topography from a global coupled atmosphere–ocean general circulation model, compare our results with previous simulation studies and available biogeological data, and review the uncertainties in the current knowledge. Based on what we know at the moment, tropical monsoon climates existed south of 20?N in South and Southeast Asia before the plateau uplit, while the East Asian monsoon was entirely absent in the extratropics. hese tropical monsoons mainly resulted from the seasonal shits of the Inter-Tropical Convergence Zone. here may have been a quasi-monsoon region in central-southern Siberia. Most of the arid regions in the Asian continent were limited to the latitudes of 20–40?N, corresponding to the range of the subtropical high pressure year-around. In the meantime, the present-day arid regions located in the relatively high latitudes in Central Asia were most likely absent before the plateau uplit. he main results from the above modeling analyses are qualitatively consistent with the available biogeological data. hese results highlight the importance of the uplit of the Tibetan Plateau in the Cenozoic evolution of the Asian climate patern of dry–wet conditions. Future studies should be focused on efects of the changes in land–sea distribution and atmospheric CO2 concentrations before and ater the plateau uplit, and also on cross-comparisons between numer

关键词： the Tibetan Plateau uplit the Asian monsoons

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Compositions of aliphatic des-A-triterpenes in the Hani peat deposit,Northeast China and its biological significance

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Chinese Science Bulletin 2010年第21期55卷 2275-2281页

作者： ZHENG YanHong ZHOU WeiJian LIU Zhao CHEN QingMin YU XueFeng LIU XiaoMin State Key laboratory of Continental Dynamics Department of Geology Northwest University Xi'an 710069 China State Key laboratory of Loess and Quaternary geology Institute of Earth Environment Chinese Academy of Sciences Xi'an 710075 China

Aliphatic des-A-triterpenes,the degradation products of pentacyclic triterpenes have been tentatively assigned in samples taken from a 963-cm-thick peat sequence from the Hani region of Northeast China using gas chromatography-mass spectrometry(GC-MS)in order to understand and identify these des-A-triterpenes response to climate and *** study indicates that aliphatic des-A-triterpenes are abundant in the Hani peat *** high relative abundance of the total des-A-triterpenes mainly occurs at the Holocene periods and is corresponding to the low sedimentation *** mechanism of des-A-triterpenes accumulation is not consistent with the previous *** is proposed that the biological community is also one influence *** obvious stage variations of the total des-A-triterpenes in the whole sequence reveal the different biological(microbes and plants) processes and responses,possibly revealing the four large replacements of biological community and functional composition in the swamp environment over the 16000 cal a *** low total des-A-triterpenes values occur at about 10200,8700,7700,6600,4480-3940 and 3040 cal a BP,reflecting the multiple millennial micro-environment oscillations under the macro-environment of the swamp during the *** ratios of diene and monoene des-A-triterpenes(DT/MT),des-A-lupane and diene and monoene des-A-triterpenes(DL/(DT+MT)),ratios ofindividual compounds exhibit vertical opposite to the total des-A-triterpenes. Namely,these ratios are high during the last deglaciation and late Holocene whereas they are low at other periods,indicating different compounds have different responses to micro-environment and microbial *** study discusses the diversity of biological community and biological functional composition response to micro-environment,which not only provides the complement in Northeast China,but also bears important fundamental information for the implication to ecological environment in the future.

关键词：三萜类化合物中国东北地区生物学意义泥炭沼泽脂肪族生物群落结构功能性反应气相色谱质谱法

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Geochronological,geochemical,and Nd-Hf isotopic studies of the Qinling Complex,central China:Implications for the evolutionary history of the North Qinling Orogenic Belt

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Geoscience Frontiers 2014年第4期5卷 499-513页

作者： Chunrong Diwu Yong Sun Yan Zhao BingXiang Liu Shaocong Lai State Key laboratory of Continental Dynamics Department of GeologyNorthwest University Key laboratory of Crust-Mantle Materials and Environments School of Earth and Space SciencesUniversity of Science and Technology of China

The Qinling Complex of central China is thought to be the oldest rock unit and the inner core of the North Qinling Orogenic Belt （NQOB）. Therefore, the Qinling Complex is the key to understanding the pre- Paleozoic evolution of the NQOB. The complex, which consists of metagraywackes and marbles, un- derwent regional amphibolite-facies metamorphism. In this study, we constrained the formation age of the Qinling Complex to the period between the late Mesoproterozoic and the early Neoproterozoic （ca. 1062-962 Ma）, rather than the Paleoproterozoic as previously thought. The LA-ICP-MS data show two major metamorphic ages （ca. 499 and ca. 420-400 Ma） for the Qinling Complex. The former age is consistent with the peak metamorphic age of the high- and ultra-high pressure （HP-UHP） rocks in the Qinling Complex, indicating that both the HP-UHP rocks and their country rocks experienced intensive regional metamorphism during the Ordovician. The latter age may constrain the time of partial melting in the NQOB between the late Silurian and early Devonian. The Qinling Complex is mostly affiliated with subduction-accretion processes along an active continental margin, and should contain detritus deposited in a forearc basin.

关键词： Qinling Orogenic BeltQinling ComplexRodiniaPartial meltingZircon

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Zircon Trace Element Constraints on the Evolution of the Paleoproterozoic Birimian Granitoids of the West African Craton(Ghana)

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Journal of earth Science 2018年第1期29卷 43-56页

作者： Patrick Asamoah Sakyi Benxun Su Daniel Kwayisi Chen Chen Yang Bai Melesse Alemayehu department of earth Science School of Physical and Mathematical Sciences University of Ghana Key laboratory of Mineral Resources Institute of Geology and Geophysics Chinese Academy of Sciences School of earth Science University of Chinese Academy of Sciences School of Applied Natural Science Applied Geology Department Adama Science and Technology University

The Paleoproterozoie Birimian granitoids of the West African Craton （WAC） in the northwestern part of Ghana, have been studied for their zircon trace elements concentrations to infer the source characteristics, origin, and magmatic evolution. The zircons in the granitoids have Th/U ratios ranging from 0.03 to 1.55, and display depleted light rare earth elements 0LREE） and enriched heavy rare earth elements （HREE） contents, characterized by pronounced positive to negative anomalies of Eu （Eu/Eu＊=0.14-0.98 and 1.01-6.06, respectively） and Ce （Ce/Ce＊=0.08-0.98 and 1.02-116, respectively）, which may imply that they were derived from both magmatic and hydrothermal sources. The geochemical plots of U/Yb vs. Y and Hf, the positive correlation between Hf and the other high field strength elements 0tFSE） and high rare earth elements （REE） contents, with enrichment in Ce and depletion in Eu, indicate that the granitoids possibly formed from partial melting of the crust. The trace elements characteristics （i.e., wide range of Hf, Ce/Ce＊, Th/U and Zr/Hf values） of the zircons suggest that crystallization of the magma occurred under variable oxidation states, which spanned over a longer period, implying that our data corroborate interpretations from studies of whole-rock geochemistry and geochronology on the granitoids of northwestern Ghana. This further indicates that the evolution of the Birimian granitoids in this part of the WAC occurred earlier than what had been reported in the literature.

关键词： West African Craton granitoids zircon trace elements magmatic evolution hydro-thermal alteration.

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Alkali feldspar syenites with shoshonitic affinities from Chhotaudepur area: Implication for mantle metasomatism in the Deccan large igneous province

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Geoscience Frontiers 2014年第2期5卷 261-276页

作者： K.R.Hari N.V.Chalapathi Rao Vikas Swarnkar Guiting Hou School of studies in geology and Water Resource Management Pt.Ravishankar Shukla University Centre of Advance Study in geology Banaras Hindu University department of Civil Engineering Yugantar Institute of Technology and Management The Key laboratory of Orogenic Belts and Crustal Evolution Ministry of Education School of Earth and Space Sciences Peking University

Two petrologically distinct alkali feldspar syenite bodies （AFS-1 and AFS-2） from Chhotaudepur area, Deccan Large Igneous Province are reported in the present work. AFS-1 is characterized by hypidio-morphic texture and consists of feldspar （Or55Ab43 to Or25Ab71）, ferro-pargasite/ferro-pargasite horn-blende, hastingsite, pyroxene （Wo47, En5, Fs46）, magnetite and biotite. AFS-2 exhibits panidiomorphic texture with euhedral pyroxene （Wo47-50, En22-39, Fs12e31） set in a groundmass matrix of alkali feldspar （Or99Ab0.77 to Or1.33Ab98）, titanite and magnetite. In comparison to AFS-1, higher elemental concentra-tions of Ba, Sr and PREE are observed in AFS-2. The average peralkaline index of the alkali feldspar syenites is w1 indicating their alkaline nature. Variation discrimination diagrams involving major and trace elements and their ratios demonstrate that these alkali feldspar syenites have a shoshonite affinity but emplaced in a within-plate and rifting environment. No evidence of crustal contamination is perceptible in the multi-element primitive mantle normalized diagram as well as in terms of trace elemental ratios. The enrichment of incompatible elements in the alkali feldspar syenites suggests the involvement of mantle metasomatism in their genesis.

关键词： Alkali feldspar syenite Deccan large igneous province Mineralogy Geochemistry Shoshonite Mantle metasomatism

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Metamorphic P-T Path Differences between the Two UHP Terranes of Sulu Orogen, Eastern China: Petrologic Comparison between Eclogites from Donghai and Rongcheng

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Journal of earth Science 2018年第5期29卷 1151-1166页

作者： Zhuoyang Li Yilong Li Jan R.Wijbrans Qijun Yang Hua-Ning Qiu Fraukje M.Brouwer School of earth Sciences State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences geology & Geochemistry Group Department of Earth Sciences VU Amsterdam College of earth Sciences Guilin University of Technology Faculty of earth Resources Key Laboratory of Tectonics and Petroleum Resources Ministry of Education China University of Geosciences

The Sulu Orogen constitutes the eastern part of the Sulu-Dabie Orogen formed by Triassic collision between the Sino-Korean and Yangtze plates. An HP Slice Ⅰ and two UHP slices Ⅱ and Ⅲ with contrasting subduction and exhumation histories within the Sulu Orogen were postulated. This study presents the metamorphic P-T paths of eclogites from the two UHP belts constructed by petrog- raphy, mineral chemistry and Perple_X P-T pseudosection modeling in the MnC（K）NFMASHO system. Eclogites from Slice Ⅲ mainly consist of omphacite, garnet and quartz, with minor rutile, ilmenite, amphibole and phengite. Eclogites from Slice Ⅱ show a porphyroblastic texture with epidote porphyroblasts and garnet, omphacite, phengite, quartz and rutile in matrix. Pseudosection modeling reveals that eclogites from Slice Ⅱ witness a peak metamorphism of eclogite-facies under conditions of 3.1-3.3 GPa and 660-690 ℃, and a retrograde cooling decompression process. The eclogites from Slice Ⅲ record a heating decompressive P-T path with a peak-P stage of 3.2 GPa and 840℃ and a peak-T stage of 2.4 GPa and 950 ℃, suggesting an apparent granulite-facies metamorphism overprint during exhumation. Both eclogites recorded clockwise P-T paths with peak P-T conditions suggesting a subduction beneath the Sino-Korean Plate to -100-105 km depth. Combined with tectonic scenarios from previous studies, it is concluded that the two UHP crustal slices in the Sulu terrane have a similar geodynamic evolution, but the UHP rocks in Slice Ⅱ exhumed after the eclogitic peak-pressure conditions earlier than that of Slice Ⅲ. The existence of Slice Ⅱ diminished the buoyancy force on Slice Ⅲ, resulting in a granulite-facies overprint on Slice Ⅲ. The Sulu orogenic belt is made up of different crustal slices that underwent different subduction and exhumation histories, rather than a single unit.

关键词： petrology UHP metamorphism exhumation process Sulu Orogen.

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Facies Analysis, Sequence Stratigraphy and Diagenetic studies of the Jurassic Carbonates of the Kohat Basin, Northwest Pakistan: Reservoir Implications

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Acta Geologica Sinica(English Edition) 2022年第5期96卷 1673-1692页

作者： Emadullah KHAN Abbas Ali NASEEM Suleman KHAN Bilal WADOOD Faisal REHMAN Maryam SALEEM Mubashir MEHMOOD Waqar AHMAD Zubair AHMED Tahir AZEEM department of earth Sciences Quaid-e-Azam UniversityIslamabad 45320Pakistan department of geology Abdul Wali Khan UniversityMardan 23200Pakistan department of geology University of PeshawarPeshawar 24420Pakistan State Key laboratory of Continental Dynamics Department of GeologyNorthwest UniversityXi’an 71006China department of geology University of SwabiSwabi 23561Pakistan department of earth&Environmental Sciences Bahria UniversityIslamabad 44000Pakistan department of earth&Atmospheric Sciences University of AlbertaEdmonton T6G 2R3Canada

The present study deals with the depositional facies, diagenetic processes and sequence stratigraphy of the shallow marine carbonates of the Samana Suk Formation, Kohat Basin, in order to elucidate its reservoir quality. The Samana Suk Formation consists of thin to thick-bedded, oolitic, bioclastic, dolomitic and fractured limestone. Based on the integration of outcrop, petrographic and biofacies analyses, the unit is thought to have been deposited on a gentle homoclinal ramp in peritidal, lagoonal and carbonate shoal settings. Frequent variations in microfacies based sea-level curve have revealed seven Transgressive Systems Tracts(TSTs) and six Regressive Systems Tracts(RSTs). The unit has undergone various stages of diagenetic processes, including mechanical and chemical compaction, cementation,micritization, dissolution and dolomitization. The petrographic analyses show the evolution of porosity in various depositional and diagenetic phases. The fenestral porosity was mainly developed in peritidal carbonates during deposition,while the burial dissolution and diagenetic dolomitization have greatly enhanced the reservoir potential of the rock unit, as is further confirmed by the plug porosity and permeability analyses. The porosities and permeabilities were higher in shoal facies deposited in TSTs, as compared to lagoonal and peritidal facies, except for the dolomite in mudstone, deposited during RSTs. Hence good, moderate and poor reservoir potential is suggested for shoal, lagoonal and peritidal facies,respectively.

关键词： porosity diagenesis reservoir Samana Suk Formation Kohat Basin

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An isotopic study of the S1 paleosol carbonates from the central Loess Plateau of North China

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Chinese Science Bulletin 1996年第18期41卷 1542-1545页

作者：陈骏安芷生王洪涛高燕 department of earth Sciences Nanjing University Nanjing 210008 China Xi'an laboratory of Loess and Quatrnary geology Chinese Academy of SciencesXi'an 710061China

The loess-paleosol sequence in the central Loess Plateau of China is produced under arid to sub-humid climatic conditions and contains abundant carbonates. These carbonates could be partly detrital derived from provenance by aerosol and partly authigenic precipitated during weathering and pedogenesis after deposition of the aerosol. Some previous studies have examined oxygen and carbon isotopic compositions of the carbonates by means of whole rock samples containing various amounts of detrital *** study separates authigenic carbonate from detrital one and only examines the former in order to investigate isotopic composition of the pedogenic carbonate and to discuss its relationships to the Asian paleomonsoon probably existing during the last interglacial time.

关键词： paleosol paleomonsoon paleoclimate stable isotopes of soil carbonate.

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