Nanhuan Glaciation Event and Its Stratigraphic Correlation in Tarim Plate, China
详细信息
- 责任者：Gao Linzhi (Institute of Geology ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Guo Xianpu
- 刊名：Acta Geoscientica Sinica
- 出版年：2013
- 卷期：34(1)
- 关键词：南华纪 ; Nanhua Period ; 冰碛岩 ; tillite ; 地层对比 ; stratigraphic correlation ; 塔里木板块 ; Tarim Plate
- 页码：p.39-57
- 图表：illus., 1 table, 76 refs.
- 分类号：1200
- issnNo：ISSN1006-3021
- isbnNo：CN11-3474/P
摘要
The hypothesis of the "Snow Earth" pours new vitality into the study of the global Neoproterozoic glaciations.According to the development of glaciations in different continents,isotopic dating,ratios of δ13C/δ18O and CIA,four glaciations have been recognized in the whole globe along different sections in different continents.The change of the circle of Neoproterozoic glaciations is regarded as the start of the early biota or division.Because the top GSSP of the Crytersian has been defined,the bottom of GSSA has become a problem in the study of glaciations.Now,the Kuruk Tag section in Tarim Plate of Xinjiang is the only section with four Neoproterozoic glaciations and different volcanic rocks.The further study of the Nanhuan glaciations in Tarim is useful work for the stratigraphic correlation with the global Neoproterozoic glaciations.The authors put forward for the first time the upper limit line of the deposition of the Bolong Formation based on the distributional pattern of debris zircon ages from the Bolong Formation,Nanhuan System.The main distributional pattern of debris zircon ages comprises 2.5 Ga,2.2 Ga and 1.8 Ga,with the youngest age being 756 Ma,suggesting that the depositional age is younger than 756 Ma.According to the distributional pattern of debris zircon ages of the Bolong Formation,they must have had different rock sources in relation to Tarim Plate.
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