地质学报2018，Vol.92Issue(6)：1163-1175,13.
武当山腹地晚古生代沉积与火山物质的识别:微体化石和锆石年代学证据
The Determination of Late Paleozoic Volcanic and Sedimentary Substances in the Hinterland of Wudang Mountain, South Qinling Orogeny:Evidence from Microfossil and Zircon Geochronology
摘要
Abstract
It is traditionally regarded that the Wudang Mountain is the Precambrian basement of South Qinling Orogeny and mainly composed of Neoproterozoic Wudang Group,Yaolinghe Group,regionally developed Doushantuo Formation.Field investigation indicates that the rock unit of the Huanglong-Fangtan area,which is different from widely distributed Precambrian orderly sequence,has the typical feature of "block in matrix" structure.Further study of microfossil and zircon isotopic geochronology indicates that the meta-quartz sandstone of formerly determined Doushantuo Formation occurs as slate,from which 15 species and more than 30 kinds of late Devonian sporopollen fossils were separated and identified.Tuffaceous sandstone,which was formerly determined as the Yaolinghe Group and occurs as schist,yielded a single weighted peak age of 382 Ma.And detrital zircon analysis suggests that provenance is dominated by late Devonian magmatic rocks,with minor from the developed Wudang Group and Yaolinghe Group.The discovery of Late Paleozoic sediments assemblage and volcanic active materials in the formerly named Precambrian rock unit in the Huanglong-Fangtan area provides the basic information for reunderstanding the material composition of Wudang Mountain.Neoproterozoic-Mesozoic zircon dating data obtained for basalt,mable,diabase and sandstone matrix,along with field investigation for structural sections,suggest that lithological units in the Huanglong-Fangtan area in Shiyang are not Precambrian orderly structural-sedimentary layer but a mélange belt.关键词
锆石测年/孢子化石/晚古生代/混杂岩带/武当山Key words
Zircon geochronology/microfossil/Late Paleozoic/Mélange/Wudang Mountain引用本文复制引用
王刚,王宗起,武昱东,王东升,王涛,王嘉玮,张航..武当山腹地晚古生代沉积与火山物质的识别:微体化石和锆石年代学证据[J].地质学报,2018,92(6):1163-1175,13.基金项目
本文受中国地质科学院基本科研业务费(项目编号:YK1701、K1615)和国家青年自然基金项目(编号:41402180)联合资助. （项目编号:YK1701、K1615）
