SHRIMP U-Pb zircon geochronology of granites from Sansom Island, Prydz Bay, East Antarctica  

作　　者：CUI Yingchun LIU Xiaochun LIU Chenguang LIU Jianhui 

机构地区：[1]Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography,SOA [2]Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology [3]Institute of Geomechanics, Chinese Academy of Geological Sciences [4]Beijing SHRIMP Centre, Institute of Geology, Chinese Academy of Geological Sciences

出　　处：《Advances in Polar Science》2018年第2期135-143,共9页极地科学进展（英文版）

基　　金：funded by the National Natural Science Foundation of China (Grant no.41530209);the Chinese Polar Environment Comprehensive Investigation and Assessment Programs (Grant nos.CHINARE2015-02-05,CHINARE2017-04-03);the Taishan Scholar Project (Grant no.TSPD20161007);the Fundamental Research Funds for National Public Research Institutes of China (Grant nos.2009T02,2014T01)

摘　　要：Sansom Island consists of two low nunataks in Sandefjord Bay, a marginal gulf of Prydz Bay, East Antarctica. These nunataks are composed of two kinds of undeformed biotite granites, and these granites have been dated by ion-microprobe U-Pb zircon geochronology. The zircons from these two samples yield SHRIMP zircon U-Pb concordant ages of 516±5 Ma and 495.8±4.2 Ma, respectively. The results indicate that these granites were emplaced in two pulses in the Cambrian, and further demonstrates the Pan-African event that has overprinted this area. The age of ca. 516 Ma suggests that the undeformed Sansom Island Granite had a different geological history from the Landing Bluff Granite, which contains deformed granite xenoliths dated at ca. 503 Ma, and probably indicates regional variations in the age and intensity of deformation.Sansom Island consists of two low nunataks in Sandefjord Bay, a marginal gulf of Prydz Bay, East Antarctica. These nunataks are composed of two kinds of undeformed biotite granites, and these granites have been dated by ion-microprobe U-Pb zircon geochronology. The zircons from these two samples yield SHRIMP zircon U-Pb concordant ages of 516±5 Ma and 495.8±4.2 Ma, respectively. The results indicate that these granites were emplaced in two pulses in the Cambrian, and further demonstrates the Pan-African event that has overprinted this area. The age of ca. 516 Ma suggests that the undeformed Sansom Island Granite had a different geological history from the Landing Bluff Granite, which contains deformed granite xenoliths dated at ca. 503 Ma, and probably indicates regional variations in the age and intensity of deformation.

关 键 词：GRANITE Sansom Island SHRIMP U-Pb zircon geochronology East Antarctica 

分 类 号：P588.121[天文地球—岩石学] P597.3[天文地球—地质学]