| 蓟县中、新元古界剖面层序地层学研究的几个基本问题 |
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| 引用本文： | 黄学光,朱士兴,贺玉贞.蓟县中、新元古界剖面层序地层学研究的几个基本问题[J].地质调查与研究,2001,24(4):201-221. |
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| 作者姓名： | 黄学光 朱士兴 贺玉贞 |
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| 作者单位： | 天津地质矿产研究所,天津,300170 |
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| 基金项目： | 地质调查局科技专项项目 (地科专 96 - 2 2 ) |
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| 摘 要： | 蓟县剖面形成于燕山裂陷槽内 ,其沉积盆地是在中元古代早期华北原地台北缘东西向大规模破裂时伸进大陆内部的一支废弃的裂谷基础上发展起来的 ,它不同于被动大陆边缘 ,因此不包括陆棚斜坡和大洋盆 ,而只相当于其中的滨海和一部分浅海 ,碳酸盐岩沉积时期则为一个陆表海。盆地的构造性质控制了盆地的沉降特征 ,在裂陷槽阶段 ,半地堑式的裂陷控制了沉积体的楔形形态 ;在过渡阶段 ,盆地主要表现为不均衡凹陷 ;在克拉通盆地阶段 ,各组的厚度小 ,岩性和岩相变化也很小 ,为典型的盖层沉积。盆地的构造性质还直接影响到副层序类型、体系域和层序界面类型的划分。确定层序界面类型时应抓住大陆架上两种类型层序界面暴露特征的差异 ,主要是河流回春和河流下切作用是否存在来加以识别和确定。本区不能划分出典型的凝缩层 (段 ) ,而最大海泛面表现为由一个或数个加积型副层序组成的最大海泛期沉积物
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| 关 键 词： | 蓟县剖面 中、新元古界 层序地层学 凝缩(层)段 最大海泛期沉积物 |
| 文章编号： | 1007-6956(2001)04-0201-21 |
| 修稿时间： | 2001年10月9日 |
Some Basic Problems in Research on Sequence Stratigraph of the Meso-and Neoproterozoic Strata in Jixian Area |
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| HUANG Xue-guang,ZHU Shi-xing,HE Yu-zhen.Some Basic Problems in Research on Sequence Stratigraph of the Meso-and Neoproterozoic Strata in Jixian Area[J].Geological Survey and Research,2001,24(4):201-221. |
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| Authors: | HUANG Xue-guang ZHU Shi-xing HE Yu-zhen |
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| Abstract: | The Jixian Section, namely the Meso- and Neoproterozoic section in Jixian County, formed in ancient Yanshan aulagen. The sedimentary basin was developed on the basis of a branch of a discarded rift in the Mesoproterozoic and the early Neoproterozoic, which located at the northern margin of the North China Pro-platform and extended in eastern and western direction when the pro-platform was broken on a large scale in the early Mesoproterozoic. It differs from the one developed at passive continental margin, so that it does not include those palaeogeographic units of the slope of shelf and the ocean basin and only develops those units that corresponded to the littoral area and a part of shallow sea in the basin at passive continental margin. In addition, it was a epicontinental sea when the carbonates were deposited in large amount. In a word, the sedimentary feature was controlled by the techtonical character of the sedimentary basin, namely the Yanshan aulagen shaped as semi-fault trough controlled sphenoid sediments when the Yansahn aulagen was formed (e.g. the first stage), the basin exhibited uneven depression during the transitional period (e.g. the second stage), and it formed the typical cap formation characterized by the less thickness of every formations and the less changes of lithofacies in the period of the intracraton basin (e.g. the third stage). The techtonical characters also effected the subdivision of the type of the subsequences, the systems tract and the boundary surface for depositional sequences. The confirmation of the type of sequence boundary is dependent mainly on the differences of the exposed marks for two types of sequence boundaries. They are mainly determined whether the rejuvenation and the dissection of stream were present in that time. The condensed section could not be separated out in the Meso- and Neoproterozoic sequences in the Jixian area, while the maximum marine flooding surfaces (mfs) shows the deposits that were formed in the maximum marine flooding period and consisted of one or some subsequences. |
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| Keywords: | Jixian section the Meso-and Neoproterozoic sequence stratigraphy |
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