Sedimentary characteristics of H Cối Formation in Quảng Ninh Province, source and tectonic connection

Nguyễn Văn Tuấn, Cao Thị Thy Bnh, Nguyễn Đức Chnh, Đặng Mỹ Cung, Trần Đại Dng

Based on analysis results of material composition and other resources of sedimentary rocks in H Ci Formation (J1-2 hc) distributed in Ọuảng Ninh province, it was showed that the sedimentary rocks are originated from mixed orogenic sands rich in quartz, they are increasing maturity from the continent block provenances, and affected by recycled orogenic provenances with relation to tectonic settings of a continental passive margin. They were formed in lake, river and swamp environments. In the research area, besides the fossils found as leaf imprints: Coniopteris sp., Equisetites sp., sporomorphs, the trunk fossil discovered in the lower part of the Formation in Mng Ci area enhances biodiversity characteristics of the Formation during hot-dry paleoclimate condition in the Early Jurassic.

Người bin tập: TS. Vũ L T