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Environment and Age of the Upper Devonian‒Carboniferous Zhulumute and Hongguleleng Formations,Junggar Basin,NW China:Ichnological and Palynological Aspects

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Acta Geologica Sinica(English Edition) 2021年第3期95卷 724-739页

作者： MichałS TACHACZ Marcelina KONDAS PawełFILIPIAK MA Xueping Institute of Geological Sciences Jagiellonian University in KrakówGronostajowa 3a30-387 KrakówPoland University of Silesia in Katowice Faculty of Natural SciencesBędzińska 6041-200 SosnowiecPoland School of Earth and Space Sciences Peking UniversityBeijing 100871China

Two Upper Devonian to Lower Carboniferous sections,namely the Bulongguoer and Haer(Gennaren area)in the Junggar Basin,Central Asian Orogenic Belt,in northwestern China were examined with regard to ichnology and *** deposits of the Hongguleleng Formation and Namu Member of the Heishantou Formation,respectively,are mostly unbioturbated or poorly bioturbated,with poorly diversified trace fossils,which indicate unfavourable conditions for the burrowing benthic community during the Late Devonian and Early *** main factor governing the growth of the bioturbating population was the rapid sedimentation of fine-grained,volcanic material documented as tempestites,which buried the benthic *** the Bulongguoer section,the presence of miospores Teichertospora torquata and Grandispora gracilis enabled identification of the broad Teichertospora torquata–Grandispora gracilis Miospore Zone from the transitional Frasnian/Famennian *** accurate identification of palynostratigraphical levels(DE and CZ Miospore zones)is only *** the basis of palynofacies analysis,samples from the lower Bulongguoer section indicate deposition in more proximal conditions,whereas samples from the top of the section indicate deposition in a more distal *** the Haer section,only a general biostratigraphic indication for the Tournaisian was possible,owing to poor preservation of organic matter.

关键词： trace fossils palynology event deposition Frasnian/Famennian/Tournaisian Xinjiang

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Genesis of granular calcite in lacustrine fine-grained sedimentary rocks and its indication to volcanichydrothermal events: A case study of Permian Lucaogou Formation in Jimusar Sag, Junggar Basin, NW China

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Petroleum Exploration and Development 2023年第3期50卷 615-627页

作者： LI Ke XI Kelai CAO Yingchang WANG Youcheng LIN Miruo Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)Qingdao 266580China

Granular calcite is an authigenic mineral in fine-grained sedimentary *** observation,thin section observation,cathodoluminescence analysis,fluid inclusion analysis,scanning electron microscope(SEM),and isotopic composition analysis were combined to clarify the genesis of granular calcite in the lacustrine fine-grained sedimentary rocks of the Permian Lucaogou Formation in the Jimusar Sag,Junggar *** is found that the granular calcite is distributed with laminated characteristics in fine-grained sedimentary rocks in tuffite zones(or the transitional zone between tuffite and micritic dolomite).Granular calcite has obvious cathodoluminesence band,and it can be divided into three ***-Ⅰ calcite,with non-luminesence,high content of Sr element,inclusions containing Cos,and homogenization temperature higher than 170℃,was directly formed from the volcanic-hydrothermal ***-Ⅱ calcite,with bright yellow luminescence,high contents of Fe,Mn and Mg,enrichment of light rare earth elements(LREEs),and high homogenization temperature,was formed by recrystallization of calcareous edges from exhalative hydrothermal ***-IlI calcite,with dark orange luminescence band,high contents of Mg,P,V and other elements,no obvious fractionation among LREEs,and low homogenization temperature,was originated from diagenetic transformation during *** granular calcite appears regularly in the vertical direction and its formation temperature decreases from the center to the margin of particles,providing direct evidences for volcanic-hydrothermal events during the deposition of the Lucaogou *** volcanic-hydrothermal event was conducive to the enrichment of organic matters in fine-grained sedimentary rocks of the Lucaogrou Formation,and positive to the development of high-quality source *** volcanic-hydrothermal sediments might generate intergranular pores/fractures during the evolution,creating conditions for the self-generation and sel

关键词： fine-grained sedimentary rocks calcite origin volcanic-hydrothermal event event deposition Permian Lucaogrou Formation Jimusar Sag Junggar Basin

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