Marine red beds occur frequently in China through geological time.Despite their complex environments,the red beds are found in three depositional settings:1) oceanic,deep water,as in the Upper Cretaceous of southern T...Marine red beds occur frequently in China through geological time.Despite their complex environments,the red beds are found in three depositional settings:1) oceanic,deep water,as in the Upper Cretaceous of southern Tibet;2) outer shelf,deeper water,as in the Lower-Middle Ordovician of South China;and 3) inner shelf,shallow water,as in the Silurian and Triassic in South China.The Silurian marine red beds are recurrent in the lower Telychian,upper Telychian,and upper Ludlow.This paper is to document the marine nature of the lower Telychian red beds (LRBs) in the Upper Yangtze Region and to discuss the spatial and temporal distribution of the LRBs and their depositional environments.The LRBs are best developed on the north side of the Cathaysian Oldland,which can be interpreted as the source area.It is inferred that they were deposited during a marine regression,characterized by the lack of upwelling,low nutrition and organic productivity with a decrease of biodiversity and a high rate of sedimentation.The iron-rich sediments may have been transported by rivers on the oldland into the Upper Yangtze Sea,as rates of deposition were rapid enough to counteract normal reducing effect around sediment-water interface.The LRBs are different from the off-shore,deeper water red beds of lower Telychian in Avalonia and Baltica and further from the oceanic,deep water red beds of Upper Cretaceous in southern Tibet chiefly in palaeogeographic settings,biotic assemblages and marine environments.展开更多
I should first mention the collective style of work in preparing the translation of VolumeV which was admirable.We all had only one objective which was to make the translationas good as possible,and everything was sub...I should first mention the collective style of work in preparing the translation of VolumeV which was admirable.We all had only one objective which was to make the translationas good as possible,and everything was subordinated to that.The second point I would like to make is that every effort was made to correct andimprove at each stage right to the very end,right up to and including the page proofs.This is essential.Of course it is virtually impossible to eliminate all errors;the fairly obviousones should have been disposed of before the two final corrections,and the process ismuch more difficult where it is not a question of eliminating errors but of choosing bet-展开更多
基金supported by Chinese Academy of Sciences (Grant No. KZCX2-YW-Q05-01)National Basic Research Program of China (Grant No. 2012CB821901)China Geological Survey (Grant No. 1212011120116)
文摘Marine red beds occur frequently in China through geological time.Despite their complex environments,the red beds are found in three depositional settings:1) oceanic,deep water,as in the Upper Cretaceous of southern Tibet;2) outer shelf,deeper water,as in the Lower-Middle Ordovician of South China;and 3) inner shelf,shallow water,as in the Silurian and Triassic in South China.The Silurian marine red beds are recurrent in the lower Telychian,upper Telychian,and upper Ludlow.This paper is to document the marine nature of the lower Telychian red beds (LRBs) in the Upper Yangtze Region and to discuss the spatial and temporal distribution of the LRBs and their depositional environments.The LRBs are best developed on the north side of the Cathaysian Oldland,which can be interpreted as the source area.It is inferred that they were deposited during a marine regression,characterized by the lack of upwelling,low nutrition and organic productivity with a decrease of biodiversity and a high rate of sedimentation.The iron-rich sediments may have been transported by rivers on the oldland into the Upper Yangtze Sea,as rates of deposition were rapid enough to counteract normal reducing effect around sediment-water interface.The LRBs are different from the off-shore,deeper water red beds of lower Telychian in Avalonia and Baltica and further from the oceanic,deep water red beds of Upper Cretaceous in southern Tibet chiefly in palaeogeographic settings,biotic assemblages and marine environments.
文摘I should first mention the collective style of work in preparing the translation of VolumeV which was admirable.We all had only one objective which was to make the translationas good as possible,and everything was subordinated to that.The second point I would like to make is that every effort was made to correct andimprove at each stage right to the very end,right up to and including the page proofs.This is essential.Of course it is virtually impossible to eliminate all errors;the fairly obviousones should have been disposed of before the two final corrections,and the process ismuch more difficult where it is not a question of eliminating errors but of choosing bet-
