你好,请
登录
首页
平台概况
新闻中心
中心新闻
行业新闻
媒体关注
平台资源
资源列表
平台服务
机时安排 A
机时安排 B
投诉建议
服务成效
服务成效
服务案例
下载中心
中心发布
调试工具
运行环境
关于
联系我们
发展历程
BJSHRIMP
平台组建背景
搜索
返回
A revised Palaeoproterozoic chronostratigraphy for the Pine Creek Orogen,northern Australia Evidence from SHRIMP U-Pb zircon geochronology
[
查看
]
KurtWorden
、
ChrisCarson
、
IanScrimgeour
、
JamesLally
、
NigelDoyle
New SHRIMP U–Pb zircon geochronology for volcanic and volcaniclastic sedimentary rocks from the central Pine Creek Orogen provides constraints on the Palaeoproterozoic evolution of northern Australia. An intermediate agglomerate from the Stag Creek Volcanics (Namoona Group) and two samples of volcaniclastic sedimentary rock from the Wildman Siltstone (Mount Partridge Group) were dated to constrain the age of the lower parts of the Palaeoproterozoic succession. These samples all have a youngest zircon population with an age in the range ca. 2030–2020 Ma, which is interpreted to approximate the age of volcanism and volcaniclastic deposition. Two widely separated samples of Gerowie Tuff from the overlying South Alligator Group have depositional ages of 1864±3Ma and 1862±4 Ma. Zircons of the Berinka Volcanics andWarrs Volcanic Member within the overlying Finniss River Group have crystallisation ages of 1861±4Ma and 1862±3 Ma, respectively. These newdata suggest that the basal units of the Pine Creek Orogen were being deposited in part during a previously unrecognised episode of ca. 2030–2020Ma felsic volcanism and sedimentation in northern Australia, which was followed by a major hiatus. The ca.1865–1860Ma ages for volcanic rocks within the South Alligator and Finniss River Groups provide a maximum age on the timing of deformation and metamorphism in the central Pine Creek Orogen, and allow correlation with felsic volcanic events across large areas of the Pine Creek Orogen and theNorth Australian Craton.
© BJSHRIMP 2013 - bjshrimp.cn