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Geochemical Characterization of Organic Rich Black Rocks of the Niutitang Formation to Reconstruct the paleoenvironmental Settings during Early Cambrian Period from Xiangxi Area,Western Hunan,China

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Journal of Earth Science 2023年第6期34卷 1827-1850页

作者： Rizwan Sarwar Awan Chenglin Liu Ashar Khan Khawaja Hasnain Iltaf Qibiao Zang Yuping Wu Sajjad Ali Muhammad Amar Gul College of Geosciences China University of PetroleumBeijing 102249China State Key Laboratory of Petroleum Resource and Prospecting China University of PetroleumBeijing 102249China Water and Power Development Authority Lahore 54000Pakistan School of Earth and Space Sciences University of Science and TechnologyHefei 230026China

The Niutitang Formation in the South China Block might be a source of hydrocarbon as it contains an enormous quantity of organic *** rock of the Early Cambrian Niutitang Formation is widely distributed in the Yangtze region,but detailed geochemical understanding of it is still *** research discusses the detailed geochemical characteristics of the Niutitang Formation to reconstruct the paleoenvironmental conditions,employing total organic carbon(TOC)content,major,trace,and rare earth element *** this purpose,black rock specimens of the Niutitang Formation from two outcrop sections were utilized for geochemical characterization,and the results compared with another eight sections from the South China *** average total organic carbon in these sediments is significantly higher(5.80 wt.%).In the platform region,lower quantities of TOC indicate a poor potential to produce *** the same time,significantly higher TOC is observed in the deep shelf and slope sediments,indicating a significant potential to produce *** average Ce,Eu and Y anomalies from both Longbizui and Sancha sections studied are 0.74,0.86,1.77,1.07,and 1.19,1.30,*** chemical index of alteration(CAI)throughout the Yangtze block is higher(averaging 71.32)than that of Post Archean Australian Shale(PAAS 69),indicating a moderately weathered source of the Niutitang Formation relative to *** the sediments are moderately weathered,this suggests these rocks might have been derived from felsic rocks,mainly *** normalization of REEs in the black rocks reveals a reduction of light REEs with increase in heavy REEs ***,a positive Eu anomaly,negative Ce anomaly,and a moderate Y/Ho(34.61)are clues to a hybrid depositional mechanism associated with hydrothermal action and terrigenous *** anomalies are also evidence of upwelling in the paleo-ocean and mixing of organic matter,which created anoxic bottom water

关键词： anomaly paleo-ocean paleoenvironment chemical index alteration weathering meta-somatism sediments

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Ce ANOMALY——A CHEMICAL TRACER FOR paleo-oceanIC REDOX VARIATION

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Chinese Science Bulletin 1992年第15期37卷 1293-1296页

作者：吴明清欧阳自远 Institute of Geochemistry Academia Sinica Guiyang 550002 PRC

Rare earth elements are an elemental family with special geochemical properties, and they always exist with each other in geological processes and reflect characteristically the nature of individual primitive material... 详细信息

关键词： Ce anomaly redox condition paleo-ocean fossil REE.

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Sm-Nd Isotopic Signatures and Significance of the Precambrian-Cambrian Seawater in China

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Science China Chemistry 1994年第10期37卷 1242-1251页

作者：杨杰东孙卫国王银喜王宗哲 Center of Modern Analysis Nanjing UniversityNanjing 210008PRC Nanjing Institute of Geology and Palaeontology Academia SinicaNanjing 210008PRC

Sm-Nd isotopic determination on small shelly fossils and collophanites collected from 3Precambrian-Cambrian boundary sections,namely Meishucun of Jinning in Yunnan,Maidiping of Emei inSichuan and Wushi of Kalpin in Xinjiang,shows that the seawater masses of these three remotely separatedareas were co-oceanic in the Precambrian-Cambrian transitional period,with a common seawater εNd（T） val-ue of -6.6±*** εNd（T） value of the China’s seawater ranges from -5.7 to-6.6 during the periodfrom 610 Ma *** 500 Ma *** research suggests that there could be an "Asiaustralian ocean" be-sides the Panthalassa ocean and the Iapetus ocean at that time,and the China’s seawater possibly belongedto the Asiaustralian *** Sm-Nd model age of the determined samples is about 1.8 Ga,which reflectsthe mean age of the continental source areas around the China’s seawater.

关键词： Precambrian-Cambrian boundary paleo-ocean fossil isotope

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Recognition　of　Ophiolite　Belt　and　Granulite　in　Northern　Area　of　Mian－Lue，　Southern　Qinling，　China　and　Their　Implication

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Journal of Earth Science 1994年第1期13卷 25-27页

作者： Xu Jifeng(Department of Geology, China University of Geosciences, Wuhan 430074)Zhang Benren Han Yinwen(Department of Geochehastry, China University of Geosciences, Wuhan 430074)

A ophiolite belt associated with the tectonic melange is recoghzed in northern area of Mian-Lue, southern Qinling. The ophiolite is considered to originate in a island arc. The occurrence of the ophiolite indicates that a paleo-ocean or finite oceanic basin existed POSt-Prot6rozoic in southern Qiuling, implying the difference of the continental basement of Southern Qinling from the Yangtze craton. The ophiolitc and themelange may mark the paleo-suture zoic between the two plates. The basic granulite is found in eastern area (Anzishan) of the ophiolite belt. The p-T path for metamorphism of the granulite demonstrates a process of continental collision.

关键词： ophiolite granulite paleo-ocean p-T path Southern Qinling.

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