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Petrography and origin of the lower ordovician microbial carbonates in the Songzi Area of Hubei Province,middle Yangtze region,China

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Petroleum Science 2019年第5期16卷 956-971页

作者： Chuan-Tao Xiao Guo-Qi Wei Zhen-Yu Song Yun-Peng Xiao Wei Yang Man Dong Yun-Fei Huang Da Gao Geosciences School of Yangtze University Wuhan 430100HubeiChina Research Institute of Petroleum Exploration and Development PetroChinaLangfang 065007HebeiChina

This study is the first systematic assessment of the lower ordovician microbial carbonates in Songzi,Hubei Province,*** paper divides the microbial carbonates into two types according to growth patterns,namely nongranular and *** nongranular types include stromatolites,thrombolites,dendrolites,leiolites and laminites;the granular types are mainly oncolites and may include a small amount of microbiogenic *** to their geometric features,the stromatolites can be divided into four types:stratiform,wavy,columnar and ***,dipyramidal columnar stromatolites are identified for the first time and represent a new type of columnar *** thrombolites are divided into three types:speckled,reticulated and *** grazing gastropod Ecculiomphalus and traces of bioturbation are observed in the speckled and reticulated *** paper considers these two kinds of thrombolites to represent bioturbated *** findings not only fill gaps in the field of domestic ordovician bioturbated thrombolites but also provide new information for the study of *** on the analysis of the sedimentary characteristics of microbialites,the depositional environments of the various types of microbialites are described,and the distribution patterns of their depositional environments are *** relationship between the development of microbialites and the evolution and radiation of metazoans during the Early to Middle ordovician is *** with the correspondence between the stepwise and rapid radiation of metazoans and the abrupt reduction in the number of microbialites between the late Early ordovician and the early Middle ordovician,fossils of benthonic grazing gastropods(Ecculiomphalus)were found in the stromatolites and thrombolite of the study *** is believed that the gradual reduction in microbialites was related to the rapid increase in the abundance of *** not only graze

关键词： Microbial carbonate Stromatolites Thrombolites Oncolite lower ordovician Songzi Area

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Features and origins of massive dolomite of lower ordovician Penglaiba Formation in the northwest Tarim Basin:Evidence from petrography and geochemistry

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Petroleum Science 2021年第5期18卷 1323-1341页

作者： Zhan-Feng Qiao Shao-Nan Zhang An-Jiang Shen Guan-Ming Shao Min She Peng Cao Xiao-Wei Sun Jie Zhang Rui-Xin Guo Xiu-Cheng Tan State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengduSichuan 610500China PetroChina Hangzhou Research Institute of Geology HangzhouZhejiang 310023China Key Laboratory of Carbonate Reservoir China National Petroleum CorporationHangzhouZhejiang 310023China

An integrated petrographical and geochemical study of the massive dolomite of the lower ordovician Penglaiba Formation of the Tarim Basin,outcropping at Yonganba recognized three dolomite types:very finely to finely crystalline nonplanar-a to planar-s dolomite(D1);medium crystalline planar-s to planar-e dolomite(D2);and coarse crystalline nonplanar-a dolomite(D3).All have been affected by burial.D1 and D2 dolomites developed initially before or during shallow burial and later recrystallized,whereas D3 dolomite replaced the initial limestone entirely during *** three dolomites have similar geochemical *** D2 dolomite tends to have more inter-crystalline pores(inherited from primary pores)and higher porosity due to its outstanding compaction resistance during shallow burial;whereas D3 dolomite does not retain appreciable primary pores due to strong cementation and pressure dissolution before *** study provides a useful model for understanding the origin and porosity development of burial dolomite,in particular Paleozoic dolomite.

关键词： Burial dolomite Dolomitization Massive dolomite lower ordovician Penglaiba Formation Tarim Basin

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Hydrothermal alteration of dolostones in the lower ordovician,Tarim Basin,NW China:Multiple constraints from petrology,isotope geochemistry and fluid inclusion microthermometry

Hydrothermal alteration of dolostones in the Lower Ordovicia...

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中国科学院地质与地球物理研究所2013年度（第13届）...

作者： Shaofeng Dong Daizhao Chen Hairuo Qing Xiqiang Zhou Dan Wang Zenghui Guo Maosheng Jiang Yixiong Qian Key Laboratory of Petroleum Resources Research Institute of Geology and GeophysicsChinese Academy of Sciences Graduate University of Chinese Academy of Sciences Department of Geology University of ReginaReginaSKCanada S4S0A2 Research Institute of China National Offshore Oil Corporation

Massive dolostones pervasively occur in the lower Paleozoic strata in Tarim Basin,NW *** study focuses on the hydrothermally-altered dolostones in the lower ordovician at Sancha,Bachu County where the hydrothermally-altered dolostones,marbles and diabase intrusions co-occur within a largescale, NW trending strike-slip fault *** this zone,the intrusive diabases mostly occur along the master border faults to the east and west,*** limestones that got in contact with the intrusions commonly were marbleized and the antecedent dolostones were subject to intense hydrothermal alteration,particularly along fractured *** on field investigations and petrographic examinations on the hydrothermally-altered dolostones,five distinctive fabrics of matrix and cement dolomites are *** episodes of vein-filling calcites postdate the hydrothermallyprecipitated saddle *** isotopic geochemistry(C,O and Sr) and fluid inclusion micro thermometry suggest that dolomite recrystallization and precipitation were associated with the hydrothermal activity induced by fracturing/faulting and intrusive *** SIMS U-Pb isotopic dating of zircon grains from the diabases yields an age of 290.5±2.9 Ma in the Early Permian, which reconciles the relative timing revealed by the paragenetic *** magmatic emplacement was thus linked to the large igneous province(LIP) of Early Permian in Tarim *** this case,the widespread magmatic activities could have caused the thermal anomaly and fracturing in the strata that were penetrated by the intrusions,enhancing the thermal diffusion and hydrothermal fluid migration (although minor volumes of thermal fluids from the basic magmas) through the fracture/fault systems, thereby resulting in contact metamorphism(or marbleization),recrystallization of matrix dolomites and dolomite precipitation commonly in primary dolostone *** study provides a useful analogue to unders

关键词： Tarim Basin lower ordovician Tectono-magmatism Isotope geochemistry U-Pb isotope dating Hydrothermally-altered dolostone

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