内蒙古准格尔旗晚石炭世一早二叠世早期腕足类物种多样性与沉积环境

Brachiopod diversity and sedimentary environments of the Late Carboniferous and early Early Permian in Jungar,Inner Mongolia

以定性与定量相结合的研究方法,对内蒙古准格尔旗晚石炭世—早二叠世早期的腕足类物种多样性、沉积环境进行了综合研究,指出本区海进序列的腕足类物种多样性远高于海退序列;规模较大、具有一定水深的海进序列是腕足类辐射、分异、物种多样性升高的重要环境体系;本区腕足类辐射起步于晚石炭世早期之初,物种多样性出现了3次峰值(晚石炭世早期之中期、晚石炭世早期之晚期、晚石炭世晚期之中期),其中晚石炭世早期之晚期是本区腕足类物种多样性的顶峰期。

Qualitative and quantitative methods were used to analyze the relationship between the brachiopod diversity pattern and the sedimentary environmental changes from Late Carboniferous to early Early Permian in Jungar area of Inner Mongolia. The results show that the brachiopod diversity on the specific level is much higher in transgressive sequences than in regressive ones and the former ones with larger scales and definite water depths are positive to the brachiopod diversity in the study area. Three peaks of the brachiopod diversification on the specific level can be recognized to correspond to the middle stage and late stage of early Late Carboniferous, and the middle stage of late Late Carboniferous and the brachiopod diversity reached the highest peak during the late stage of early Late Carboniferous.