The Pb-Pb Isochron Age of the Kuangshishan Formation in Shennongjia Area on the Northern Margin of the Yangtze Craton and Its Geological Implications
Lu Shansong
Qiu Xiaofei
Tan Juanjuan
Lü Hong
Yang Hongmei
Wang Zhixian
Zhong Quan
Abstract：The Shennongjia Group,located on the northern margin of the Yangtze Craton,shows a series of well-preserved suc-cession of the Mesoproterozoic carbonate strata.However,geochronological data collected from this area are limited.In this study,we report a Pb-Pb isochron age for the Kuangshishan Formation of the Shennongjia Group.The 206 Pb∕204 Pb ratios of the dolostone of the Kuangshishan Formation show wide variations from 18.753 to 23.106.On the contrary,the 207 Pb∕204 Pb ratios and the 208 Pb∕204 Pb ratios have a limited range from 15.606 to 16.046 and 37.793 to 38.599,respectively.8 dolostone samples data show an obvious linear relationship between 206 Pb∕204 Pb and 207 Pb∕204 Pb,yielding a Pb-Pb isochron age of 1 632±75 Ma (MSWD=8.7)which represent the depositional age for the Kuangshishan Formation.This age accords well with previous pub-lished data,indicating that a precise stratigraphic age of the ancient carbonate strata can be obtained through Pb-Pb dating tech-nique.Combined with previous researches,we suggest that the age span of the Shennongjia Group is 1 600 to 1 100 Ma of Me-soproterozoic.
Keywords：Shennongj ia GroupKuangshishan FormationPb-Pb isochronMesoproterozoiccarbonatepetrology
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 317-324 )