New U-Pb zircon ages of the Ediacaran-Cambrian boundary strata in South China

被引：151

作者：

Chen, Daizhao ^{[1
]}

Zhou, Xiqiang ^{[1
]}

Fu, Yong ^{[2
]}

Wang, Jianguo ^{[1
]}

Yan, Detian ^{[3
]}

机构：

[1] Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China

[2] Guizhou Univ, Coll Resource & Environm Engn, Guiyang 550012, Peoples R China

[3] China Univ Geosci, Key Lab Tecton & Petr Resources, Minist Educ, Wuhan 430074, Peoples R China

来源：

TERRA NOVA | 2015年 / 27卷 / 01期

关键词：

YANGTZE PLATFORM; GEOCHRONOLOGICAL CONSTRAINTS; ISOTOPE SIGNATURES; YUNNAN PROVINCE; TUFF LAYER; CARBON; SECTION; STRATIGRAPHY; TRANSITION; EVOLUTION;

D O I：

10.1111/ter.12134

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The Ediacaran-Cambrian transition is a critical interval marking drastic biological, oceanic and geochemical co-evolutions in geological history, but it is poorly constrained geochronologically in South China. We here present two new sets of SIMS U-Pb zircon ages from Ediacaran-Cambrian boundary strata (Dengying, Liuchapo and Niutitang formations) deposited in the slope-basin environments of carbonate platforms. Two weighted-mean U-Pb ages of 542.1 +/- 5.0Ma and 542.6 +/- 3.7Ma in the basal and mid-upper Liuchapo Formation, respectively, in slope and basinal settings provide the first direct age set for the Ediacaran-Cambrian boundary in South China. Another two U-Pb ages of 524.2 +/- 5.1Ma and 522.3 +/- 3.7Ma from the base of the overlying Niutitang Formation indicate that this widespread unit in South China was deposited about 20Ma after the onset of the Cambrian.

引用

页码：62 / 68

页数：7

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