Changhsingian sea level changes and brachiopod diversity in the upper Yangtze region  

作　　者：ZENG Yong LIU Mei WANG ZhanLei CHEN Wei 

机构地区：[1]School of Resource,Engineering and Earth Science of China University of Mining and Technology,Xuzhou 221008,China

出　　处：《Science China Earth Sciences》2007年第3期343-349,共7页中国科学（地球科学英文版）

基　　金：the National Natural Science Foundation of China (Grant No. 40272016); the State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology,CAS (Grant No.043105)

摘　　要：Sedimentary environment and distribution of brachiopods during the Changhsingian in Xingwen, Si-chuan Province of the upper Yangtze region, are statistically analyzed. Changing regularity in diversity of brachiopod is synthetically investigated based on qualitative and quantitative analysis of transgres-sion-regression cycles. The results show that the diversity of brachiopods in this region in the trans-gression (aggradation) sequence is higher than that in the regression (progradation) sequence. The brachiopods in this area began to diversify in the early Changhsingian. And the species diversity had four peak stages which are respectively in the middle Early Changhsingian, late Early Changhsingian, early Late Changhsingian and late Late Changhsingian. The species diversity reached its highest in the late Late Changhsingian but this is followed by a sharp decrease at the end-hanghsingian, indicating the mass extinction of most brachiopod species which were prosperous in the Late Paleozoic.Sedimentary environment and distribution of brachiopods during the Changhsingian in Xingwen, Sichuan Province of the upper Yangtze region, are statistically analyzed. Changing regularity in diversity of brachiopod is synthetically investigated based on qualitative and quantitative analysis of transgression-regression cycles. The results show that the diversity of brachiopods in this region in the transgression (aggradation) sequence is higher than that in the regression (progradation) sequence. The brachiopods in this area began to diversify in the early Changhsingian. And the species diversity had four peak stages which are respectively in the middle Early Changhsingian, late Early Changhsingian, early Late Changhsingian and late Late Changhsingian. The species diversity reached its highest in the late Late Changhsingian but this is followed by a sharp decrease at the end-hanghsingian, indicating the mass extinction of most brachiopod species which were prosperous in the Late Paleozoic.

关 键 词：species DIVERSITY sea level change BRACHIOPODS CHANGHSINGIAN UPPER YANGTZE region 

分 类 号：Q958.8[生物学—动物学]