瓜德鲁普统与乐平统的全球界线层型剖面—蓬莱滩剖面及其辅助剖面—铁桥剖面位于广西来宾地区,两剖面沿红水河两岸连续出露,是开展沉积相和层序地层研究的理想剖面。在两剖面的瓜德鲁普统茅口组与乐平统合山组中共识别出14种沉积相,组成...瓜德鲁普统与乐平统的全球界线层型剖面—蓬莱滩剖面及其辅助剖面—铁桥剖面位于广西来宾地区,两剖面沿红水河两岸连续出露,是开展沉积相和层序地层研究的理想剖面。在两剖面的瓜德鲁普统茅口组与乐平统合山组中共识别出14种沉积相,组成4类沉积相组合,分别为盆地相、下斜坡相、上斜坡相和台地边缘相。依据这些沉积相及相组合垂向演化样式和横向分布特征,识别出6个主要的海侵—海退层序(TR),并具有高分辨率牙形石带的约束,分别为:TR1(J.nankingensis zone)、TR2(J.aserrata to J.shannoni zone)、TR3(J.shannoni zone to early C.p.postbitteri zone)、TR4(C.p.postbitteri zone to early C.transcaucasia zone)、TR5(C.transcaucasia zone to C.orientalis zone)和TR6(C.orientalis zone to C.inflecta zone)。基于两剖面的海侵—海退层序,开展了本地区高分辨率(等时)层序古地理恢复,这对厘定这一时期海平面下降、峨眉山玄武岩喷发、生物灭绝等重要事件之间联系可能具有重要的指示意义。展开更多
Thermoluminescence(TL)in marine carbonate has been proposed as a potential proxy for reconstruction of paleoceanography history,and has already been used in defining the Quaternary environment.However,its availability...Thermoluminescence(TL)in marine carbonate has been proposed as a potential proxy for reconstruction of paleoceanography history,and has already been used in defining the Quaternary environment.However,its availability in the geological time scale,such as Permian,is still on debate.The mass extinction event caused by drastic changes of global marine environment in Middle-Late Permian provides a typical example to testify the applicability of this proxy.Here we measured the natural thermoluminescence of the carbonate-dominating marine sediments collected from the strata through the Guadalupian-Lopingian mass extinction boundary(G/LB)in the Penglaitan Section in Laibin,Guangxi,China.Our results reveal that TL intensities of carbonate are much higher than those of siliceous rocks,which indicates that the carbonate is the main contributor to the TL.The variation of TL intensities are related with Mn and Fe contents in the carbonate lattices while high Mn and low Fe(e.g.,high Mn/Fe ratio)in carbonate will release stronger TL.Due to the better storage of carbonate lattices for original information of Mn and Fe in seawater,thermoluminescence of carbonate-dominating sediments/rocks could sensitively reflect marine environment and biological productivity in geological time scale.展开更多
文摘瓜德鲁普统与乐平统的全球界线层型剖面—蓬莱滩剖面及其辅助剖面—铁桥剖面位于广西来宾地区,两剖面沿红水河两岸连续出露,是开展沉积相和层序地层研究的理想剖面。在两剖面的瓜德鲁普统茅口组与乐平统合山组中共识别出14种沉积相,组成4类沉积相组合,分别为盆地相、下斜坡相、上斜坡相和台地边缘相。依据这些沉积相及相组合垂向演化样式和横向分布特征,识别出6个主要的海侵—海退层序(TR),并具有高分辨率牙形石带的约束,分别为:TR1(J.nankingensis zone)、TR2(J.aserrata to J.shannoni zone)、TR3(J.shannoni zone to early C.p.postbitteri zone)、TR4(C.p.postbitteri zone to early C.transcaucasia zone)、TR5(C.transcaucasia zone to C.orientalis zone)和TR6(C.orientalis zone to C.inflecta zone)。基于两剖面的海侵—海退层序,开展了本地区高分辨率(等时)层序古地理恢复,这对厘定这一时期海平面下降、峨眉山玄武岩喷发、生物灭绝等重要事件之间联系可能具有重要的指示意义。
基金supported by National Basic Research Program of China (Grant No.2011CB808800)National Fund for Geological Talents Training(Grant No. J0830520)
文摘Thermoluminescence(TL)in marine carbonate has been proposed as a potential proxy for reconstruction of paleoceanography history,and has already been used in defining the Quaternary environment.However,its availability in the geological time scale,such as Permian,is still on debate.The mass extinction event caused by drastic changes of global marine environment in Middle-Late Permian provides a typical example to testify the applicability of this proxy.Here we measured the natural thermoluminescence of the carbonate-dominating marine sediments collected from the strata through the Guadalupian-Lopingian mass extinction boundary(G/LB)in the Penglaitan Section in Laibin,Guangxi,China.Our results reveal that TL intensities of carbonate are much higher than those of siliceous rocks,which indicates that the carbonate is the main contributor to the TL.The variation of TL intensities are related with Mn and Fe contents in the carbonate lattices while high Mn and low Fe(e.g.,high Mn/Fe ratio)in carbonate will release stronger TL.Due to the better storage of carbonate lattices for original information of Mn and Fe in seawater,thermoluminescence of carbonate-dominating sediments/rocks could sensitively reflect marine environment and biological productivity in geological time scale.
