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Sự tiến hóa địa động lực khu vực Tây Bắc dựa trên các nghiên cứu đá trầm tích màu đỏ hệ tầng Yên Châu (K2yc)

Nguyễn Đức Chính, Nguyễn Xuân Khiển, Tạ Trọng Thắng


The red-beds of Yen Chau formation have been subjected to the two stages for supplying sedimentary deposits:

* The first stage is corresponding to the lower part of the Yen Chau formation. The main source of supplying debris is essential from rich-in-quartz sedimentary rocks, acidic and basic igneous rocks.

The sedimentary materials are mainly coarsegrained, multimineralic sandstones (mainly Litharenite and Subfeldsarenite) which are characterized for passive continental margin settings.

* The second stage is corresponding to the higher part of the Yen Chau formation. The main provenance is composed of rich-in-quartz sedimentary rocks and acidic igneous rocks. The coarse-grained sedimentary material such as conglomerates, sandstones bearing polymineralic gravels intercalated with coarse-grained sandstones of bad to medium sorting and medium rounding (mainly Litheranite and Lithic- Feldsarenite) characterizing for re-orogenic settings.

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Vietnam Journal of Earth Sciences, ISSN: 0866-7187; 2615-9783

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