Late Cretaceous lacustrine deposits in Songliao Basin provide a unique material to study the paleo-environment and paleoclimate of nomarine Cretaceous.Two large transgressions occurred during the Qingshankou and Nenji...Late Cretaceous lacustrine deposits in Songliao Basin provide a unique material to study the paleo-environment and paleoclimate of nomarine Cretaceous.Two large transgressions occurred during the Qingshankou and Nenjiang deposition times,the later of which was larger.Based on sedimentation,ostracode,TOC,HI,δ<sup>13</sup>C<sub>org</sub> and C/N from upper Yaojia Formation to Lower Nenjiang Formation in the eastern Songliao Basin。展开更多
Recent advances in geological, palaeobiological and stable isotopic research in Kumaon\|Garhwal Lesser and Tethys Himalaya suggest that India was part of a major single super continent Rodinia during Neoproterozoic—L...Recent advances in geological, palaeobiological and stable isotopic research in Kumaon\|Garhwal Lesser and Tethys Himalaya suggest that India was part of a major single super continent Rodinia during Neoproterozoic—Lower Palaeozoic times. The breakup of Rodinia and fragmentation of Gondwana land, existence of large Proto\|Tethys ocean, low latitude glaciation and global warming reflected by carbon isotopes and imprints of Pan African rifting events have been recently recorded in the Indian Himalaya, South of Tibetan Plateau (Tewari, 1998). A detailed correlation of these events in other parts of the NW and NE Himalaya and China further supports that these events are of global significance.The complete sequence of Lower Palaeozoic is missing in the Lesser Himalaya after regression of sea in the Lower Cambrian, however three major marine transgressions during Permian, Cretaceous and Eocene have been recorded over Terminal Proterozoic/Cambrian sequences. The discovery of microstromatolites and microbiota from the Menga (Buxa) dolomite of eastern Himalaya, Arunachal Pradesh (Tewari, 1999) also confirm Terminal Proterozoic age and sedimentation. The Permian marine transgression throughout the Himalaya suggest birth of Neotethys sea.Shallow marine reef builders, cyanobacteria\|bacteria and stromatolites of Early Carboniferous age were thriving in the Himalayan Tethys of India. 13 C records from Lesser and Tethys Himalaya reflect global isotopic variations in Neoproterozoic to Palaeozoic oceans of the world.展开更多
Songliao Basin is a large-scale Cretaceous continental sedimentary basin in northeastern China. In the northern Songliao Basin Nenjiang Formation Unit 1 are mainly dark mudstones with dolostone interbeds.Understanding...Songliao Basin is a large-scale Cretaceous continental sedimentary basin in northeastern China. In the northern Songliao Basin Nenjiang Formation Unit 1 are mainly dark mudstones with dolostone interbeds.Understanding the sedimentary characteristics and dolomitization of the dolostones is of great significance to the paleoenvironment and paleoc-展开更多
文摘Late Cretaceous lacustrine deposits in Songliao Basin provide a unique material to study the paleo-environment and paleoclimate of nomarine Cretaceous.Two large transgressions occurred during the Qingshankou and Nenjiang deposition times,the later of which was larger.Based on sedimentation,ostracode,TOC,HI,δ<sup>13</sup>C<sub>org</sub> and C/N from upper Yaojia Formation to Lower Nenjiang Formation in the eastern Songliao Basin。
文摘Recent advances in geological, palaeobiological and stable isotopic research in Kumaon\|Garhwal Lesser and Tethys Himalaya suggest that India was part of a major single super continent Rodinia during Neoproterozoic—Lower Palaeozoic times. The breakup of Rodinia and fragmentation of Gondwana land, existence of large Proto\|Tethys ocean, low latitude glaciation and global warming reflected by carbon isotopes and imprints of Pan African rifting events have been recently recorded in the Indian Himalaya, South of Tibetan Plateau (Tewari, 1998). A detailed correlation of these events in other parts of the NW and NE Himalaya and China further supports that these events are of global significance.The complete sequence of Lower Palaeozoic is missing in the Lesser Himalaya after regression of sea in the Lower Cambrian, however three major marine transgressions during Permian, Cretaceous and Eocene have been recorded over Terminal Proterozoic/Cambrian sequences. The discovery of microstromatolites and microbiota from the Menga (Buxa) dolomite of eastern Himalaya, Arunachal Pradesh (Tewari, 1999) also confirm Terminal Proterozoic age and sedimentation. The Permian marine transgression throughout the Himalaya suggest birth of Neotethys sea.Shallow marine reef builders, cyanobacteria\|bacteria and stromatolites of Early Carboniferous age were thriving in the Himalayan Tethys of India. 13 C records from Lesser and Tethys Himalaya reflect global isotopic variations in Neoproterozoic to Palaeozoic oceans of the world.
文摘Songliao Basin is a large-scale Cretaceous continental sedimentary basin in northeastern China. In the northern Songliao Basin Nenjiang Formation Unit 1 are mainly dark mudstones with dolostone interbeds.Understanding the sedimentary characteristics and dolomitization of the dolostones is of great significance to the paleoenvironment and paleoc-
