Marine Transgression-Regression and Brachiopod Diversity from the Wujiapingian in the Hechuan Area of Chongqing
ZENG Yong
KE Yan
QIN Chao
CHEN Feng-jie
LIU Jin-jin
LIU Yan-sha
Abstract：Based on analyzing sedimentary environment and Brachiopod stratigraphic distribu-tion of Wujiapingian in Hechuan, Chongqing, the Brachiopods species diversity changes in this area was investigated combining the transgression-regression cyclothems and species diversity integrate index with qualitative and quantitative analysis. The results show that Wujiapingian Brachiopods species radiation appeared in early Wujiapingian, which contained four fastigiums and four low tides. During the Wujiapingian, species radiate fastigiums mostly appeared in pro-phase, while the radiate low tides in anaphase, with the trend of species diversity descend con-tinuously. In normal transgression-regression sequence, Brachiopods species diversity in trans-gression is visibly higher than that in regression. But in fast-transitory transgression-regression sequence, Brachiopods species diversity in regression is higher than that in transgression, which reflected that seawater depth and environment stability are important impact factors of species diversity.
Keywords：species diversitymarine transegression-regressionBrachiopodWujiapingianHechuan
Publication Date：2009-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 782-788 )