Devonian-Carboniferous Hangenberg Crisis in South China:Variations in Trace Elements,Strontium and Carbon Isotope Chemostratigraphy in the Nanbiancun Carbonate Section  

作　　者：DENG Faliang LIU Xijun YU Hongxia YAO Ye ZHANG Zhiguo WEI Weilie LI Rui 

机构地区：[1]Guangxi Key Laboratory of Hidden Metallic Ore Deposit Exploration,College of Earth Sciences,Guilin University of Technology,Guilin 541004,China [2]Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources,Guilin University of Technology,Guilin 541004,China [3]Xinjiang Research Center for Mineral Resources,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China

出　　处：《Acta Geologica Sinica(English Edition)》2022年第4期1166-1180,共15页地质学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(92055208);Guangxi Natural Science Foundation for Distinguished Young Scholars(2018GXNSFFA281009);the CAS‘Light of West China’Program(2018-XBYJRC-003);the Guangxi Science Innovation Base Construction Foundation(Guike ZY21195031);the Fifth Bagui Scholar Innovation Project of the Guangxi Province(to Xu Jifeng);the grant of the Laboratory for Marine Geology,Qingdao National Laboratory for Marine Science and Technology(MGQNLM201901)。

摘　　要：The global Hangenberg Crisis or Hangenberg Extinction is a mass extinction near the Devonian-Carboniferous boundary.Comprehensive research of petrology and geochemistry on the Devonian-Carboniferous boundary,as exposed in the Nanbiancun auxiliary stratotype section,South China,elucidates paleoenvironmental changes and controls on marine strontium(^(87)Sr/^(86)Sr)and carbonate carbon(δ^(13)C_(carb))isotopes during the Hangenberg Crisis.The new^(87)Sr/^(86)Sr data reveal a regression in the Middle Siphonodella praesulcata Zone,while the Hangenberg Extinction was occurring in South China.Moreover,theδ^(13)C_(carb)data records a negative excursion near the base of the Middle Siphonodella praesulcata Zone that may have been connected with the Hangenberg Extinction.A positiveδ^(13)C_(carb)excursion,corresponding with the Upper Siphonodella praesulcata Zone,may reflect the effects of a vigorous biological pump.The magnitude of the Hangenberg Carbon Isotopic Excursion in peakδ^(13)carb values andδ^(13)C_(carb)gradient in carbonate Devonian-Carboniferous boundary sections of the South China Craton during the Hangenberg Crisis,are a function of depositional water depth and distance from the shore.The carbon cycling during the Hangenberg Carbon Isotopic Excursion had a much stronger impact on oceanic surface waters than on the deep ocean and theδ^(13)C_(carb)gradient of local seawater was likely caused by enhanced marine productivity,associated with biological recovery in platform sediments during the Hangenberg Crisis.

关 键 词：strontium and carbon isotopes Nanbiancun auxiliary stratotype section Hangenberg Crisis Devonian-Carboniferous boundary South China 

分 类 号：P534.4[天文地球—古生物学与地层学] P588.245[天文地球—地质学]