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| 新元古代冰期及其年代 | |
| 引用本文： | 黄晶,储雪蕾,张启锐,冯连君.新元古代冰期及其年代[J].地学前缘,2007,14(2):249-256. |
| 作者姓名： | 黄晶 储雪蕾 张启锐 冯连君 |
| 作者单位： | 1. 中国科学院,地质与地球物理研究所,北京,100029;中国科学院,矿物资源研究重点实验室,北京,100029;中国科学院,研究生院,北京,100049 2. 中国科学院,地质与地球物理研究所,北京,100029;中国科学院,矿物资源研究重点实验室,北京,100029 3. 中国科学院,地质与地球物理研究所,北京,100029 |
| 基金项目： | 国家自然科学基金 , 中国科学院知识创新工程项目 |
| 摘 要： | 新元古代在全球范围内出现了几期冰期事件,称之为“雪球地球”事件。这种剧烈的环境变化带来此后地球上生命演化的一次飞跃。“雪球地球”事件的核心是全球冰期的同时性,需要同位素地质年代学的证据。新元古代末期两次主要的冰期事件是Marinoan冰期和Sturtian冰期,其中Marinoan冰期结束于635Ma;Sturtian冰期可能发生在710～720Ma,已发表的年龄数据限定它在670Ma之前结束。Marinoan冰期后的Gaskiers冰期发生在580～590Ma。对华南的古城、铁丝坳、长安组、江口组等进行进一步精确定年,将对限定Sturtian冰期持续时间和Cryogenian、南华系的下限年龄具有重要意义。 |
| 关 键 词： | 新元古代 冰期 地质年代学 Marinoan冰期 Sturtian冰期 |
| 文章编号： | 1005-2321(2007)02-0249-08 |
| 修稿时间： | 2006年6月5日 |
Constraints on the age of Neoproterozoic global glaciations |
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| Huang Jing,Chu Xuelei,Zhang Qirui,Feng Lianjun.Constraints on the age of Neoproterozoic global glaciations[J].Earth Science Frontiers,2007,14(2):249-256. | |
| Authors: | Huang Jing Chu Xuelei Zhang Qirui Feng Lianjun |
| Abstract: | There were several glacial events around the world which are called “Snowball Earth” during the late Neoproterozoic time. These glaciations profoundly influenced early faunal evolution. “Snowball Earth” is at the core of the glaciations events, therefore we need precise geochronological data in order to prove the global synchroneity of the Neoproterozoic glaciations. Two major Neoproterozoic glaciations are Marinoan and Sturtian. A number of studies suggested that the Marinoan glaciation terminated about 635 Ma ago, but the time of its beginning is uncertain. The lower limit for Sturtian glaciation is about 710-720 Ma, and published data shows that the upper limit for Sturtian glaciation is about 670 Ma. The more precise geochronological data for Gucheng, Tiesiao and Changan Formations in South China are very important for the duration of the Sturtian glaciation and the lower age limit of the Nanhua System and the Cryogenian. |
| Keywords: | Neoproterozoic glaciations geochronology Marinoan Sturtian |
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