| 滇中新元古代裂谷盆地充填序列及演化模式:对Rodinia超大陆裂解的响应 |
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| 引用本文： | 崔晓庄,江新胜,王剑,卓皆文,伍皓,熊国庆,陆俊泽,邓奇,江卓斐.滇中新元古代裂谷盆地充填序列及演化模式:对Rodinia超大陆裂解的响应[J].沉积学报,2014,32(3):399-409. |
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| 作者姓名： | 崔晓庄 江新胜 王剑 卓皆文 伍皓 熊国庆 陆俊泽 邓奇 江卓斐 |
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| 作者单位： | 成都地质矿产研究所;中国地质科学院;中国地质大学(北京); |
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| 基金项目： | 国家自然科学基金重点项目(批准号:41030315);中国地质调查局项目(编号:1212011121105,12120114067901)联合资助 |
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| 摘 要： | 以滇中新元古代裂谷盆地沉积充填为研究对象，开展了系统的沉积学和盆地分析研究。结果表明，滇中新元古代裂谷盆地具有4个充填序列，分别代表盆地的4个发展阶段。其中，序列I为柳坝塘组及陆良组下段，沉积时限为820~800 Ma，属低密度浊流和深水饥饿沉积，代表裂谷盆地的快速沉降阶段；序列II为澄江组、陆良组上段及牛头山组，沉积时限为800~725 Ma，属扇三角洲-湖泊沉积，代表裂谷盆地的成熟发展阶段；序列III为南沱组，沉积时限可能为725~635 Ma，属大陆冰川沉积，代表裂谷盆地开始向被动大陆边缘盆地转换的阶段；序列IV主要为陡山沱组，沉积时限为635~551 Ma，属潮坪沉积，为裂谷盖地层。进一步研究揭示，滇中新元古代裂谷盆地由幼年期分布局限的小型同向半地堑盆地群演化为成熟期统一的大型半地堑盆地，属上叠滑脱盆地。综合研究证实，滇中新元古代裂谷盆地应为陆内裂谷盆地，是Rodinia超大陆裂解的产物。
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| 关 键 词： | 充填序列 盆地演化 陆内裂谷盆地 新元古代 华南 Rodinia超大陆 |
| 收稿时间： | 2013-11-04 |
Filling Sequence and Evolution Model of the Neoproterozoic Rift Basin in Central Yunnan Province,South China: Response to the breakup of Rodinia Supercontinent |
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| Abstract: | Taking sedimentary filling of the Neoproterozoic rift basin in central Yunnan province as a research object, sedimentology and basin analysis researches are carried out in this paper. The results show that there are four filling sequences in the Neoproterozoic rift basin in central Yunnan province, representing four basin evolution stages respectively. The Liubatang Formation and lower Luliang Formation, which were deposited between 820 Ma and 800 Ma regarded as low density turbidity current and deep water starved deposits, belonging to the first sequence that represents the rapid subsidence stage of the rift basin; The Chengjiang Formation, upper Luliang Formation and Niutoushan Formation, which were deposited between 800 Ma and 725 Ma and regarded as fan dalta and lacustrine deposits, belonging to the second sequence that represents the mature development stage of the rift basin; The Nantuo Formation that might be deposited between 725 Ma and 635 Ma and are interpreted as continental glacial deposits, belonging to the third stage that represents the transition stage from the rift basin to the passive margin basin; The Doushantuo Formation, which were deposited between 635 Ma and 551 Ma and interpreted as tidal flat deposits, belonging to the rift cover. Further study reveals that the Neoproterozoic rift basin in central Yunnan province composed of mini unidirectional half-graben basins during juvenile stage and evolved into a large united half-graben basin during mature stage, which should be attributable to a supradetachment basin. Furthermore, it is demonstrated that the Neoproterozoic rift basin in central Yunnan province should be intracontinental rift basin, which may be related to the breakup of Rodinia Supercontinent. |
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