| 长江三峡东部地区震旦纪事件沉积? |
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| 引用本文： | 佟彦明,郭成贤,危宇宁.长江三峡东部地区震旦纪事件沉积?[J].古地理学报,2002,4(2):38-45. |
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| 作者姓名： | 佟彦明 郭成贤 危宇宁 |
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| 作者单位： | 1.江汉石油学院地球科学系，湖北江汉 434102;2.辽河油田公司欢喜岭采油厂地质大队，辽宁盘锦 124010 |
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| 基金项目： | 国家“八五”重点攻关项目 (85 10 2 14 0 4 0 4 )“中扬子台地北缘下古生界斜坡带重点层段沉积相、成岩作用及储集条件研究”，中国石油天然气集团公司科技项目“长江三峡剖面微缩工程”的成果之一 |
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| 摘 要： | 长江三峡东部地区震旦纪先后发生了热事件、冷事件、重力事件等突发性灾变沉积。早震旦世发育由河流作用与陆地冰川作用形成的陆源碎屑沉积；晚震旦世则发育由两次台地-盆地-台地的海进-海退旋回形成的巨厚海相碳酸盐沉积。热事件沉积产物见于下震旦统莲沱组，夹于河流相沉积的砂岩及粉砂岩中。根据凝灰碎屑的岩石学特征，可将其分为降落型凝灰碎屑和水携型凝灰碎屑两类。冷事件沉积产物为下震旦统南沱冰碛层，属低纬度低高程的大陆冰川沉积。重力事件可分为滑塌事件和浊流事件，其沉积产物均分布于上震旦统，夹在大套的深水碳酸盐岩中。其中滑塌事件的沉积产物主要为滑塌角砾白云岩（石灰岩），浊流事件的沉积产物主要为浊积颗粒石灰岩（白云岩）。
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| 关 键 词： | 事件沉积 热事件 冷事件 重力事件 震旦纪 长江三峡 |
| 文章编号： | 1671-1505(2002)02-0038-08 |
| 修稿时间： | 2001年6月18日 |
SINIAN EVENT DEPOSITS IN THE EASTERN PART OF THE YANGTZE GORGE |
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| Tong Yanming,Guo Chengxian,Wei Yuning,Geology.SINIAN EVENT DEPOSITS IN THE EASTERN PART OF THE YANGTZE GORGE[J].Journal of Palaeogeography,2002,4(2):38-45. |
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| Authors: | Tong Yanming Guo Chengxian Wei Yuning Geology |
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| Institution: | 1.Geology Department of Jianghan Petroleum University, Jianghan 434102, Hubei
2 Huanxiling Production Factory of Liaohe Oil Company, Panjiang 124010, Liaoning |
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| Abstract: | During the Sinian, a series of catastrophic events occurred in the eastern part of the Yangtze Gorge, including hot, cold and gravity events. In the Early Sinian, clastic sediments formed by fluvial and continental glacial actions were developed, while in the Late Sinian, great thickness of marine carbonate rocks formed by two transgression regression cycles were developed. Hot event deposits occurred in Liantuo Formation of Lower Sinian, interbedded in fluvial facies sandstones and siltstones. According to the lithologic characteristics of tuff clasts, descendant tuff clasts and water carried tuff clasts can be divided. Cold event deposits were developed in the Nantuo Formation of the Lower Sinian and should be continental glacial deposits in a low latitude and low altitude area. The gravity events include slumping event and turbidity current event, and the gravity event deposits were developed in deep water carbonate rocks in the Upper Sinian. The slumping event deposits were mainly breccia dolostone (limestone) while the turbidity current event deposits were turbidity grain limestone (dolostone). |
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| Keywords: | event deposits hot event cold event gravity event Sinian Yangtze Gorge |
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