新疆巴楚小海子剖面泥盆系Frasnian-Famennian界线

FRASNIAN-FAMENNIAN BOUNDARY (DEVONIAN) OF THE XIAOHAIZI SECTION AT BACHU, XINJIANG

应用化学 -生物地层学方法 ,在新疆塔里木盆地首次识别出了泥盆系 Frasnian- Fam ennian界线。在巴楚小海子剖面 ,以出现牙形石 Icriodus deformatus和可与华南 F- F界线化学异常对比的化学元素丰度或比值异常为标志 ,将 F- F界线置于巴楚组中段底部灰岩中。研究结果表明 ,重要的储油层和开发层——东河砂岩段位于 F- F界线之下 ,为泥盆纪弗拉斯期。同时 ,本文为探讨地史期间最重大的事件之一—— F- F事件的特征和机制提供了资料。

The Frasnian-Famennian (F-F) boundary (Devonian) is recognized in the Tarim Basin (Xinjiang) by applying chemo-biostratigraphic correlation method. At the Xiaohaizi Section of Bachu County, the F-F boundary is placed in the basal limestone of the Middle Member of the Bachu Formation, which is marked by the first appearance of conodont Icriodus deformatus and appearance of characteristic chemo-fluctuations, which can be correlated with the Frasnian-Famennian chemo-fluctuation in South China. The results of the present study indicate that the Donghe Sandstone, an important oil reservoir and development stratum lying below the F-F boundary, is attributed to the Frasnian (Devonian). Furthermore, the present paper also provides data for exploring the characteristics and mechanism of the Frasnian-Famennian Boundary Event, which is one of the greatest events in the Earth history.