TY - JOUR
T1 - Qingbaikouan and Crygenian in South China
T2 - Constraints by SHRIMP zircon U-Pb dating
AU - Gao, Linzhi
AU - Ding, Xiaozhong
AU - Yin, Chongyu
AU - Zhang, Chuanheng
AU - Ettensohn, Frank R.
PY - 2013/12
Y1 - 2013/12
N2 - The Qingbaikouan System is the lowest unit of the Neoproterozoic Erathem in Chinese stratigraphic succession, and it now provides a precise geochronological framework and geological time scale for mapping and stratal correlation in China. However, a sensitive high-resolution ion microprobe (SHRIMP) U-Pb zircon age date (1368±12 Ma) obtained from a bentonite in the Qingbaikouan Xiamaling Formation indicates that it belongs to the Mesoproterozoic Erathem instead. This change is a milestone in understanding the Precambrian Stratigraphic Time Scale in China, and it has had great influence on Precambrian correlations in Asia. Otherwise, a large amount of geochronological work has been done in the " Jiangnan Orogen Belt" of South China, and new isotopic data have redefined the traditional recognition of metamorphosed Mesoproterozoic strata from the Sibao orogeny to the Neoproterozoic Erathem. Based on SHRIMP zircon U-Pb age data, the authors regard the Sibao orogeny (equal to the Wuling orogeny) as a movement at ca 820 Ma, meaning that the Sibao orogeny was not equivalent to the Grenvillian orogeny. Finally, we report here the first SHRIMP U-Pb age of the boundary between the top of the Qingbaikouan Gongdong Formation (786.8±5.6 Ma) and the bottom of the Chang'an (diamictite) Formation (778.4±5.2 Ma), which is the age of the lowest diamictite of the Nanhuan System in China.
AB - The Qingbaikouan System is the lowest unit of the Neoproterozoic Erathem in Chinese stratigraphic succession, and it now provides a precise geochronological framework and geological time scale for mapping and stratal correlation in China. However, a sensitive high-resolution ion microprobe (SHRIMP) U-Pb zircon age date (1368±12 Ma) obtained from a bentonite in the Qingbaikouan Xiamaling Formation indicates that it belongs to the Mesoproterozoic Erathem instead. This change is a milestone in understanding the Precambrian Stratigraphic Time Scale in China, and it has had great influence on Precambrian correlations in Asia. Otherwise, a large amount of geochronological work has been done in the " Jiangnan Orogen Belt" of South China, and new isotopic data have redefined the traditional recognition of metamorphosed Mesoproterozoic strata from the Sibao orogeny to the Neoproterozoic Erathem. Based on SHRIMP zircon U-Pb age data, the authors regard the Sibao orogeny (equal to the Wuling orogeny) as a movement at ca 820 Ma, meaning that the Sibao orogeny was not equivalent to the Grenvillian orogeny. Finally, we report here the first SHRIMP U-Pb age of the boundary between the top of the Qingbaikouan Gongdong Formation (786.8±5.6 Ma) and the bottom of the Chang'an (diamictite) Formation (778.4±5.2 Ma), which is the age of the lowest diamictite of the Nanhuan System in China.
KW - Nanhuan System
KW - Neoproterozoic
KW - SHRIMP U-Pb Geochronology
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U2 - 10.1111/1755-6724.12158
DO - 10.1111/1755-6724.12158
M3 - Article
AN - SCOPUS:84898870720
SN - 1000-9515
VL - 87
SP - 1540
EP - 1553
JO - Acta Geologica Sinica (English edition)
JF - Acta Geologica Sinica (English edition)
IS - 6
ER -