中扬子地区志留系几丁虫复苏、多样性与环境

项目名称： 中扬子地区志留系几丁虫复苏、多样性与环境

项目编号： No.41472031

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 天文学、地球科学

项目作者： 陈孝红

作者单位： 中国地质调查局武汉地质调查中心

项目金额： 105万元

中文摘要： 基于中扬子区不同古地理部位黔北、渝东、湘西和鄂西志留系典型剖面高分辨率几丁虫样品的系统采集、分析和研究，厘定和完善扬子区志留纪几丁虫序列，建立志留纪几丁虫多样性曲线，分析和讨论志留系几丁虫复苏过程和表现形式,解决扬子区不同相区志留纪地层的对比，特别是鄂西纱帽组上部砂岩段和湘西小溪组时代问题。在此基础上，结合沉积相和关键层、段碎屑岩微量元素以及有机质和碳酸盐岩稳定碳、氧同位素地球化学特征及其环境意义的综合研究，分析与讨论扬子地区志留纪古地理、古气候变化特点，揭示几丁虫的复苏和多样化与环境演变的关系。

中文关键词： 几丁虫；复苏；多样性；志留系；中扬子

英文摘要： Based on the high resolution systematic collection, analysis and study of the chitinozoan samples at the typical Silurian sections scattered at the different palaeogeographic regions of Yangtze Platform, i.e., Northern Guizhou Province, Eastern Chongqing City, Western Hunan Province and Western Hubei Province, the Silurian chitinozoan sequence of the Yangtze area will be revised; the Silurian chitinozoan diversity curve will be compiled; and the Silurian stratigraphic correlation between different sedimentary facies zones in the Yangtze area will be solved, especially the problem of the ages of the sand beds at the upper part of Shamao Formation in the west Hubei area and the Xiaoxi Formation in the west Hunan area. Furthermore, based on the integrated study of sedimentary facies, the characteristics of the trace elements of clastic rocks, the stable Carbon and Oxygen isotopes of organic and carbonate rocks at the key beds or layers and their significance for the environments, the paleogeography and paleoclimate of the Silurian in the Yangtze area and the relationships between the Silurian chitinozoan recovery, diversity and the environment changes will be analyzed and probed into.

英文关键词： chitinozoa;recovery;diversification;Silurian;Central Yangtze area