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地质学报（英文版）
中国地质学会
地质学报（英文版）

中国地质学会

程裕淇

双月刊

1000-9515

geoacta@public3.bta.net.cn

010-68999024

100037

北京复外百万庄26号

地质学报（英文版）/Journal Acta Geologica SinicaCSCDCSTPCDSCI
查看更多>>本刊以反映中国地质界在地质科学理论研究、基础研究和基本地质问题研究的最新、最重要成果为主要任务，兼及新技术与方法。全面系统地向国外读者介绍中国地学研究的新进展。
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    The Geology,Fluid Inclusions,and O-S Isotopes of the Mibei Gold Deposit,Hunan Province,Southern China

    XUE WenhaoLIANG YayunLI XiaofengLI Mingyi...
    992-1006页
    查看更多>>摘要：The Mibei gold deposit,located in the southwestern part of the Xuefengshan uplift zone,the middle section of the Jiangnan orogenic belt in southern China,has estimated gold resources of approximately seven tons.This deposit is primarily a quartz vein-type gold deposit,with ore bodies occurring mainly within Neoproterozoic metasediments.The main metallic minerals in the ore are pyrite,chalcopyrite,and arsenopyrite.In this study,the petrography and microthermometry of ore-forming fluid inclusions,oxygen isotopes of gold-bearing quartz,and sulfur isotopes of gold-bearing sulfides and arsenopyrite were analyzed.Three types of fluid inclusions were identified:type Ⅰa three-phase inclusions comprising vapor and two phases of liquids(VCO2+LCO2+LH2O),type Ⅰb two-phase liquids(LCO2+LH2O),typeⅡ two-phase vapor-rich inclusions(V/V+L＞50％),and type Ⅲ pure liquid inclusions.Type Ⅰ inclusions were heated uniformly to the liquid phase,type Ⅱ inclusions were heated uniformly to the gas phase,and type Ⅲ inclusions were heated without change.In general,the temperature range of homogenization to liquid phase of fluid inclusions in the Mibei gold deposit is 204-227℃.The salinity of the inclusion ranges from 4.6 to 12.2 wt％NaCl equiv.The δ18OSMOW of gold-bearing quartz varies from 16.9‰ to 17.5‰.The δ18OH2O of gold-bearing quartz are varied from 6.5‰ to 7.5‰.The δ34S values of gold-bearing pyrite range from 1.7‰ to 6.8‰.The δ34S values of gold-bearing arsenopyrite range from 5.6‰ to 5.9‰.Theδ34S values of pyrite from wall rocks slate range from 6.4‰ to 11.6‰.This evidence implies that the ore-forming fluids of the Mibei gold deposit originated from magmatic-hydrothermal processes,mixing with minor S from the surrounding metasediments.Combined with the evolution of the Jiangnan orogenic belt,due to the magmatic and tectonic activities of the Xuefengshan uplift during the Caledonian period,the fault seal mechanism controlled the ore-forming process.Overall,the Mibei gold deposit is more akin to a magmatic-hydrothermal gold deposit.
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    Provenance and Paleoclimate of the Triassic to Middle Jurassic Adigrat Sandstone,Blue Nile Basin,Central Ethiopia

    Bekele BARSISAAyalew DEREJEKidanemariam GILAMICHAELAtnafu BALEMWAL...
    1007-1020页
    查看更多>>摘要：Mineralogical and geochemical studies have been undertaken on the Triassic to Lower Jurassic Adigrat Sandstone of the Blue Nile Basin of central Ethiopia to infer its source rock type,paleoweathering,and paleoclimatic history.The Adigrat Sandstone occurs at the basal section of the Mesozoic sedimentary formation and unconformably overlays the Neoproterozoic-Paleozoic crystalline rocks,or locally,the Karroo sediments in the northern Blue Nile Basin.A mineralogical study reveals that quartz(Q),feldspars(F),and lithic fragments(L)are the framework grains of the sandstone.On the QFL diagram,the plot of the modal composition of the sandstone mainly falls within the feldspathic arenite and quartzose arenite fields.The geochemical data of the lower section of the sandstone mainly falls within the arkose and subarkose fields,whereas the upper section data falls within the quartzose and sublithic arenite fields.Mineralogical and geochemical weathering indices indicate that the provenances of the Adigrat Sandstone were exposed to pronounced weathering intensity,where the lower part of the sandstone was controlled by arid to semi-arid conditions,whereas the upper section was linked to humid to semi-humid(tropical to subtropical)climatic conditions.Mineralogical and geochemical data also indicate that mafic to intermediate basement rocks were the primary source rocks of the sediment.Perhaps the sediment was assumed to have been reworked by multi-cyclic sedimentary processes.The discriminant function diagram,the REE pattern,La/Th vs.La/Yb,and the Th-Hf-Co plot are consistent.A comparison of provenance studies for the Adigrat Sandstone in the Blue Nile Basin and the Mekele outlier of northern Ethiopia indicates that the sediment of the former is highly sorted,experienced higher weathering intensity,and compositionally derived from mafic to intermediate crystalline rocks.On the other hand,the sediment of the latter is essentially a weathering product of felsic rocks.
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    Changes in Calcareous Nannofossil Assemblages and Paleoenvironmental Interpretation of the Early Miocene Lice Formation,Kahramanmara? Basin,Turkey,East Mediterranean

    Caner KAYA ?ZERMuazez Esra ORHANU?ur TEM?Z
    1021-1034页
    查看更多>>摘要：This study investigated the calcareous nannofossil assemblages in detail from the early Miocene aged Lice Formation outcropping in the Kahramanmaraş basin.The biostratigraphy of calcareous nannofossils was outlined and paleoenvironmental features determined.In 81 samples taken from three measured sections in the region,17 calcareous nannofossil genus and 48 nannofossil species were identified.These calcareous nannofossil genus and species identified the Lice Formation as being in the CNM4 nannofossil biozone.The abundance and diversity of early Miocene calcareous nannofossil species varied in the measured sections,with the samples generally moderate-poor,apart from a few samples.The relative abundance of individuals of Cyclicargolithus floridanus,Coccolithus pelagicus,Reticulofenestra hagii and Sphenolithus moriformis species,with paleoecological importance identified in the study region,indicate that in early Miocene times,the basin in which the Lice Formation deposited was meso-eutrophic with excess nutrient input,temperate and generally stable shallow marine conditions.
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    Early Jurassic Climate Warming in Eastern Siberia:First Macrofloristic Evidence from Irkutsk Basin,Russia

    Andrey FROLOVIrina MASHCHUK
    1035-1050页
    查看更多>>摘要：Numerous new records of Ferganiella,Podozamites,and Schidolepium,including a new species,Ferganiella ivantsovii sp.nov.,are described from the Early Jurassic(Toarcian)Middle Subformation of the Prisayan Formation from the Euro-Sinian paleofloristic region in the Irkutsk Basin,Eastern Siberia,Russia.An analysis of the paleogeographic distribution of Ferganiella and Podozamites shows that both genera were the most diverse and numerous in the East Asian province of the Euro-Sinian region and in the Northern Chinese province of the Siberian region during the Early and Middle Jurassic.These phytochoria were located in the subtropical and temperate subtropical climate zones,which allows us to consider Ferganiella and Podozamites as thermophilic plants,which are important indicators of the Early Toarcian climatic optimum.Their abundance in the Irkutsk Basin thus may indicate Early Toarcian warming;further abundant Schidolepium cones,which produced Araucariacites pollen,typical for Euro-Sinian flora complement the scenario.Thus,the new finds are the first macrofloristic indicators of the Toarcian climatic optimum in the Irkutsk Basin.
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    Principle of Hydrogen Isotope Geochemistry Paleo-altimeter and its Potential in Reconstructing Paleo-elevation of the Southeastern Tibetan Plateau

    CUI FengzhenLIU-ZENG JingLI YunshuaiXU Qiang...
    1051-1063页
    查看更多>>摘要：The reconstruction of paleo-elevation serves a dual purpose to enhance our comprehension of geodynamic processes affecting terrestrial landforms and to contribute significantly to the interpretation of atmospheric circulation and biodiversity.The oxygen(δ18Ow)and deuterium(δDw)isotopes in atmospheric precipitation are systematically depleted with the increase of altitude,which are typical and widely applicated paleo-altimeters.The utilization of hydrogen isotope of hydrous silicate minerals within the shear zone system,volcanic glass,and plant leaf wax alkanes offers valuable insights for addressing evaporation and diagenesis.In this paper,we review the principle,application conditions,and influencing factors of the hydrogen isotope paleo-altimeter.In addition,we discuss the feasibility of utilizing this technique for quantitatively estimating the paleo-elevation of the southeastern Tibetan Plateau,where multiple shear zones extend over hundred kilometers parallel to the topographic gradient.
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    Depositional Environment and Origin of Inertinite-rich Coal in the Ordos Basin

    SHI QingminZHAO JunJI RuijunXUE Weifeng...
    1064-1085页
    查看更多>>摘要：Inertinite-rich coal is widely distributed in the Ordos Basin,represented by the No.2 coal seam of the Middle Jurassic Yan'an Formation.This paper combined coal petrology and geochemistry to analyze the origin of inertinite,changes in the coal-forming environment and control characteristics of wildfire.Research has shown that there are two forms of inertinite sources in the study area.Alongside typical fusinization,wildfire events also play a substantial role in inertinite formation.There are significant fluctuations in the coal-forming environment of samples at different depths.Coal samples were formed in dry forest swamp with low water levels and strong oxidation,which have a high inertinite content,and the samples formed in wet forest swamp and limnic showed low inertinite content.Conversely,the inertinite content of different origins does not fully correspond to the depositional environment characterized by dryness and oxidation.Non-pyrogenic inertinites were significantly influenced by climatic conditions,while pyrofusinite was not entirely controlled by climatic conditions but rather directly impacted by wildfire events.The high oxygen level was the main factor causing widespread wildfire events.Overall,the combination of wildfire activity and oxidation generates a high content of inertinite in the Middle Jurassic coal of the Ordos Basin.
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    Relationship between Natural Fracture and Structural Style and its Implication for Tight Gas Enrichment:A Case Study of Deep Ahe Formation in the Dibei-Tuzi Area,Kuqa Depression

    XIA LuXI KelaiYANG XianzhangHAN Zhanghua...
    1086-1110页
    查看更多>>摘要：The deep Lower Jurassic Ahe Formation(J1a)in the Dibei-Tuzi area of the Kuqa Depression has not been extensively explored because of the complex distribution of fractures.A study was conducted to investigate the relationship between the natural fracture distribution and structural style.The J1a fractures in this area were mainly high-angle shear fractures.A backward thrust structure(BTS)is favorable for gas migration and accumulation,probably because natural fractures are more developed in the middle and upper parts of a thick competent layer.The opposing thrust structure(OTS)was strongly compressed,and the natural fractures in the middle and lower parts of the thick competent layer around the fault were more intense.The vertical fracture distribution in the thick competent layers of an imbricate-thrust structure(ITS)differs from that of BTS and OTS.The intensity of the fractures in the ITS anticline is similar to that in the BTS.Fracture density in monoclinic strata in a ITS is controlled by faulting.Overall,the structural style controls the configuration of faults and anticlines,and the stress on the competent layers,which significantly affects deep gas reservoir fractures.The enrichment of deep tight sandstone gas is likely controlled by two closely spaced faults and a fault-related anticline.
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    Geochemical Anomalies Identified by Multifractal Modeling:Implications for Mineral Exploration in the Ziyoutun Cu-Au District,Jilin Province,China

    MA HuchaoWANG DaBAI FengLIU Meng...
    1111-1124页
    查看更多>>摘要：The Ziyoutun Cu-Au district is located in the Jizhong-Yanbian Metallogenic Belt and possesses excellent prospects.However,the thick regolith and complex tectonic settings present challenges in terms of detecting and decomposition of weak geochemical anomalies.To address this challenge,we initially conducted a comprehensive analysis of l:10,000-scale soil geochemical data.This analysis included multivariate statistical techniques,such as correlation analysis,R-mode cluster analysis,Q-Q plots and factor analysis.Subsequently,we decomposed the geochemical anomalies,identifying weak anomalies using spectrum-area modeling and local singularity analysis.The results indicate that the assemblage of Au-Cu-Bi-As-Sb represents the mineralization at Ziyoutun.In comparison to conventional methods,spectrum-area modeling and local singularity analysis outperform in terms of identification of anomalies.Ultimately,we considered four specific target areas(AP01,AP02,AP03 and AP04)for future exploration,based on geochemical anomalies and favorable geological factors.Within AP01 and AP02,the geochemical anomalies suggest potential mineralization at depth,whereas in AP03 and AP04 the surface anomalies require additional geological investigation.Consequently,we recommend conducting drilling,following more extensive surface fieldwork,at the first two targets and verifying surface anomalies in the last two targets.We anticipate these findings will significantly enhance future exploration in Ziyoutun.
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