Geochronology of Early Precambrian Strata in Northeastern Hubei Province

• 作 者: 陈汉宗
• 机 构: South China Sea Institute of Oceanology Academia Sinica,
• 出 处: Chinese Journal of Geochemistry(English Language Edition)
• 发表日期: 1988年01期
• 关键词: strata tectonic Hubei Strata dated Yangtze subgroup hasbeen formations basement

Northeastern Hubei Province,as a part of the Qinling fold system,is located in the transition zonebetween the North China platform and the Yangtze paraplatform.This tectonic unit is of particularsignificance in the study of the Dabieshan Group and Tongbaishan Group strata.The paper summarizes theauthor’s recent studies on the geochronology of these strata.By taking into account the regionallymetamorphic characteristics,the geochronology of the Early Precambrian strata in the region studied hasbeen established.The lower subgroup of the Dabieshan Group is Late Archean in age.while the uppersubgroup of the Dabieshan Group and the Tongbaishan Group are Early Proterozoic in age,the Dabieshanmovement is dated at 1950±50Ma,which is also the age of the boundary between the Lower and MiddleProterozoic.

Northeastern Hubei Province, as a part of the Qinling fold system, is located in the transition zonebetween the North China platform and the Yangtze paraplatform. This tectonic unit is of particularsignificance in the study of the Dabieshan Group and Tongbaishan Group strata. The paper summarizes the author’s recent studies on the geochronology of these strata.By taking into account the regionallymetamorphic characteristics, the geochronology of the Early Precambrian strata in the region studied hasbeen established. the lower subgroup of the Dabieshan Group is Late Archean in age. while the uppersubgroup of the Dabieshan Group and the Tongbaishan Group are Early Proterozoic in age, the Dabieshanmovement is dated at 1950 ± 50Ma, which is also the age of the boundary between the Lower and Middle Proterozoic.