川西前陆盆地上三叠统须家河组地层的划分对比及沉积演化

CORRELATION AND EVOLUTION OF THE UPPER TRIASSIC XUJIAHE FORMATION IN THE WEST SICHUAN FORELAND BASIN

为了解决川西前陆盆地上三叠统须家河组地层的划分和对比问题,从岩石地层和层序地层两个方面进行了研究,利用地震、古生物、录井以及野外露头等资料对上三叠统的地层划分和对比方案进行了重新厘定,提出了不同地区的须家河组和香溪群的地层对比和划分方案,并且在层序地层学研究基础上提出了“早期海相构造层序”和“晚期陆相构造层序”。具体介绍和解释了川西“对冲式”前陆盆地地层沉积演化模式的特点和形成原因。

Based on sequence stratigraphic and the lithostratigraphic studies using outcrop and subsurface data, the subdivision and correlation of the Triassic coal-bearing Xujiahe Formation is revised. The correlation of the Xujiahe and Xiangxi formations of different lithostratigraphic realms is evaluated. We propose that the Upper Triassic stratigraphic sequence in the West Sichuan area represents an early marine stage and a late non-marine stage. Stratigraphic data presented in this paper have implications for the Late Triassic tectonic history in the West Sichuan area.