描述产于云南省广南县吊丝竹(Dendrocalamus minor)新品种:毛吊丝竹(Dendrocalamus minor var.pubiculmus)。该品种在形态上与吊丝竹相近,区别在于该品种新秆初生时密被棕色细毛;节间部分均具不规则黄色纵条纹;秆箨初生时密被黑棕色刺毛...描述产于云南省广南县吊丝竹(Dendrocalamus minor)新品种:毛吊丝竹(Dendrocalamus minor var.pubiculmus)。该品种在形态上与吊丝竹相近,区别在于该品种新秆初生时密被棕色细毛;节间部分均具不规则黄色纵条纹;秆箨初生时密被黑棕色刺毛,边缘具短纤毛;部分叶片具黄色纵条纹。展开更多
Caledonian orogeny is another important tectonic event in South China Block after the breakup of the Rodinia supercontinent.With a view to constrain the tectonic evolution and proto-basin in South China,this paper rep...Caledonian orogeny is another important tectonic event in South China Block after the breakup of the Rodinia supercontinent.With a view to constrain the tectonic evolution and proto-basin in South China,this paper reports the geochemical and zircon U-Pb dating data of the Ordovician strata in central Hunan,South China.Geochemical features and paleocurrent directions suggest that the lower Ordovician deposited in a passive continental margin basin with a provenance of quartzose components and showing an affinity with the Yangtze Block.U-Pb age data for 260 detrital zircons from upper Ordovician identify three major age populations as:900-1200 Ma,1400-1800 Ma and 2400-2700 Ma.The detrital zircon age spectrum as well as the paleocurrent directions suggest that upper Ordovician deposited in a foreland basin and showing a close affinity with the Cathaysia Block.It is also suggest that the lower Ordovician continuously accepted the mineral from the Yangtze Block,whereas the provenance of the upper Ordovician sedimentary basin changed from the Yangtze Block to the Cathaysia Block.This change implies a tectonic movement,which caused the transformation of the proto-basin in the Hunan area in SCB from passive continental margin basin to foreland basin probably took place during late Ordovician.This fact also demonstrate that the Caledonian orogeny in South China Block began no later than 453 Ma,and a new crustal evolution model is proposed.展开更多
文摘描述产于云南省广南县吊丝竹(Dendrocalamus minor)新品种:毛吊丝竹(Dendrocalamus minor var.pubiculmus)。该品种在形态上与吊丝竹相近,区别在于该品种新秆初生时密被棕色细毛;节间部分均具不规则黄色纵条纹;秆箨初生时密被黑棕色刺毛,边缘具短纤毛;部分叶片具黄色纵条纹。
基金financially supported by the China Geological Survey(Nos.DD20190370,121201111120117 and 121201102000150012-32)。
文摘Caledonian orogeny is another important tectonic event in South China Block after the breakup of the Rodinia supercontinent.With a view to constrain the tectonic evolution and proto-basin in South China,this paper reports the geochemical and zircon U-Pb dating data of the Ordovician strata in central Hunan,South China.Geochemical features and paleocurrent directions suggest that the lower Ordovician deposited in a passive continental margin basin with a provenance of quartzose components and showing an affinity with the Yangtze Block.U-Pb age data for 260 detrital zircons from upper Ordovician identify three major age populations as:900-1200 Ma,1400-1800 Ma and 2400-2700 Ma.The detrital zircon age spectrum as well as the paleocurrent directions suggest that upper Ordovician deposited in a foreland basin and showing a close affinity with the Cathaysia Block.It is also suggest that the lower Ordovician continuously accepted the mineral from the Yangtze Block,whereas the provenance of the upper Ordovician sedimentary basin changed from the Yangtze Block to the Cathaysia Block.This change implies a tectonic movement,which caused the transformation of the proto-basin in the Hunan area in SCB from passive continental margin basin to foreland basin probably took place during late Ordovician.This fact also demonstrate that the Caledonian orogeny in South China Block began no later than 453 Ma,and a new crustal evolution model is proposed.
基金Applied Basic Research in Guangdong(Grant No.2021A1515011302)Special Project for Creation of National Parks in Guangdong(Grant No.2021GJGY034)Project in Danxia Mountain Nature Reserve.
