| 新元古代“雪球地球”形成与消融及华南板块的记录 |
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| 引用本文： | 邹灏,李峤昕,陈安清,肖斌,蒋修未,黄长成,胡成辉,李蝶.新元古代“雪球地球”形成与消融及华南板块的记录[J].沉积学报,2022,40(4):1043-1058. |
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| 作者姓名： | 邹灏 李峤昕 陈安清 肖斌 蒋修未 黄长成 胡成辉 李蝶 |
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| 作者单位： | 1.成都理工大学地球科学学院, 成都 610059 |
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| 基金项目： | 国家自然科学基金41702107中国博士后基金2019M650833岩石圈演化国家重点实验室开放基金KDL-K201902四川省教育厅重大培育项目2018CZ0009 |
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| 摘 要： | 新元古代为距今约1 000~540 Ma的地质历史时期，当时地球处于Rodinia超大陆汇聚和裂解期，板块运动和岩浆作用强烈，且伴随全球性气温下降以及大范围的几期冰期作用，形成覆盖整个地球的冰雪，形成雪球地球（Snowball Earth）。就华南板块而言，在新元古代时期存在有几期冰期冰碛物残留，学者们对其的定年工作成果也相当丰富，但对雪球地球的形成和消融因素方面还存在的一定争议，包括形成与消融时间、方式、影响因素等。通过总结前人研究成果，从而提出关于华南板块新元古代“雪球地球”形成与消融因素，即在当时古地理环境下雪球地球的形成与消融是多因素综合性作用的结果，包括地史早期微生物作用、超大陆裂解以及超级地幔柱、甲烷渗漏、冰期岩浆热液作用。从新元古代以来，随着Rodinia超大陆的裂解以及在超级地幔柱作用下，海岸线不断增加，大量微生物以及小壳动物繁殖，呈现峰值增加，CO2等温室气体含量迅速下降，从而破坏温室平衡。后期由于冰期岩浆热液作用以及海底温室气体CH4排放，导致温室效应重新加剧，恢复原始地球形貌。
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| 关 键 词： | 新元古代 雪球地球 华南板块 古地理 全球冰期 气候变化 |
| 收稿时间： | 2020-09-21 |
The Formation and Disappearance of the Neoproterozoic “Snowball Earth” and the Records from the South China Plate |
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| Institution: | 1.College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China2.Key Laboratory of Tectonic Mineralization and Accumulation, Ministry of Natural Resources, Chengdu 610059, China3.State Key Laboratory of Oil and Gas Reservoir Geology and Development Engineering, Chengdu 610059, China4.School of Earth Science and Resources, China University of Geosciences(Beijing), Beijing 100083, China |
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| Abstract: | The Neoproterozoic is a geological period that occurred around 1 000 - 540 Ma. At that time， the earth was in the period of the Rodinia supercontinent convergence and break-up， with strong plate movement and magmatism， accompanied by global temperature decline and several large-scale glacial periods， forming snow covering the whole earth， and then forming Snowball Earth. Several glacial periods existed on the South China during the Neoproterozoic period， and numerous dating data have already been performed. However， some dispute about the formation and disappearance factors of Snowball Earth still exist， including the formation and disappearance time， mode， and influencing factors. Based on the summary of previous studies， this paper concludes the formation and disappearance factors of the Neoproterozoic Snowball Earth on the South China， were the result of multiple factors， including microbial action in early geological history， supercontinent break-up， mantle superplume， methane leakage， and glacial magmatic hydrothermal action. Since the Neoproterozoic， with the break-up of the Rodinia supercontinent and under the action of a mantle superplume， the length of the coastline has been increasing， and the favorable environment for microbial growth has gradually formed. Since the Early Paleozoic， huge microorganisms and small shelled animal populations have increased， and the content of greenhouse gases such as carbon dioxide （CO2） has decreased rapidly， thus destroying the greenhouse balance. In the later stage， due to the magmatic hydrothermal effect during the glacial period and the emission of methane （CH4） from the sea floor， the greenhouse effect has intensified again， and the original earth morphology has been restored. |
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