川黔地区长兴阶至三叠系底部的腕足动物化石群落及其控制因素

BRACHIOPOD COMMUNITIES FROM CHANGXINGIAN TO TRIASSIC BASEMENT IN SICHUAN-GUIZHOU AND THEIR CONTROLLING FACTORS

根据川黔地区六条长兴阶至三叠系底部剖面的详细统计资料，建立了该地区的五个以腕足动物占优势的平坦海底底栖群落。各群落与底栖组合的关系分别是：Ｌｉｎｇｕｌａ群落（ＢＡ１）－Ｑｉｎｇｌｏｎｇｉａｏｖａｌｉｓ群落（ＢＡ２）－Ｏｌｄｈａｍｉｎａ群落（ＢＡ３）－Ｐｅｌｔｉｃｈｉａ群落（ＢＡ３）－Ｐａｒｙｐｈｅｌｌａ－Ｗａａｇｅｎｉｔｅｓ群落（ＢＡ４－ＢＡ５）。控制腕足动物群落分布的因素是海水深度、底质、盐度及食物供应。

Based on the detailed statistic data of six sections from Changxingian stage to Triassic basement in Sichuan and Guizhou Provinces, five benthonic communities dominated by brachiopods on flat sea floor have been established. The relationships between the communities and the benthonic assemblsges are respectively: Lingula Community(BA1)-Qingtongia ovalis Community(BA2)-Oldhamina Community(BA3)-Peltichia Community(BA3)-Paryphella-Waagenites Community (BA4-BA5). Studied their characteristics and environmental locations, it is suggested that the factors controlling the distribution of brachiopod communities in the area are water depth, substrata, salinity and food supply.