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Paleomagnetism of Early Tertiary volcanics in the South Shetland Islands and its tectonic implications
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作者 刘坚 葛同明 +1 位作者 段威武 吴能友 《Chinese Journal of Polar Science》 1995年第2期18-29,共12页
A total of 334 oriented volcanic samples of Early Tertiary were collected for a paleomagnetic study from 43 sampling sites in the South Shetland Islands,Antarctica.Paleomagnetic study indicates that the South Shetland... A total of 334 oriented volcanic samples of Early Tertiary were collected for a paleomagnetic study from 43 sampling sites in the South Shetland Islands,Antarctica.Paleomagnetic study indicates that the South Shetland Islands and Antarctic Peninsula were situated in or close to their present position in Early Tertiary. Furthermore, it is also suggested that a counterclockwise rotation about 15 degrees related to the relative movement between South America and Antarctica took place in north of Antarctic Peninsula since Paleocene. 展开更多
关键词 South Shetland Islands early tertiary VOLCANICS paleomagnetism.
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On Lacustrine Depositional Systems and Coal Accumulation in Baise Basin
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作者 Chen Beiyue Xie YongseuChina University of Geoseiences , Wuhan 430074 《Journal of Earth Science》 SCIE CAS CSCD 1993年第1期80-87,140,共9页
Baise basin is a semi-graben type , pan-shaped faulted basin of Early Tertiary , in which carbonate lacustrine deposits and elastic lacustrine deposits developed . The assemblages of Gilbert-type delta-lakes ,littoral... Baise basin is a semi-graben type , pan-shaped faulted basin of Early Tertiary , in which carbonate lacustrine deposits and elastic lacustrine deposits developed . The assemblages of Gilbert-type delta-lakes ,littoral ,shallow and deep water fades are recognized . Based on grain size , the clastic lacustrine deposit systems can be grouped in three kinds of depositional sequences of progressive deposition : (1)from coarse to fine , (2)from fine to coarse and (3) from fine to coarse and then to fine agan . This was controlled mainly by hydrodynamic factor of lake bottom type .Lake shore was an important place for coal accumulation and peatmoor development . It had long time for coal accumulation and there was a very little amount of minerals into the basin ,and the thick coal layer and high quality coal developed m the zone where initial lake bottom was plan-like and the surface stream flow was weak .Peat accumulation advanced from the margin to the center of basin .Carbonate lakes contained much water ,very high preponderant contenis of coagel ,low inert contents and no fusinite in the coal . 展开更多
关键词 lacustrine deposit system pattern of coal accumulation early tertiary Baise basin.
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