Early-Middle Jurassic lithological and depositional facies of the Da Lat back-arc basin

  • Bui Huy Hoang Vietnam Petroleum Institute
  • Nguyen Quang Tuan Vietnam Petroleum Institute
Keywords: Da Lat basin, lithofacies, depositional environment, back-arc, Jurassic

Abstract

The Da Lat back-arc basin formed on a deformed lithosphere caused by subduction of the Paleo-Pacific plate under Eurasia in the Mesozoic.

Lithology and sedimentary structure analysis from field works and UAV imaging show that the Early-Middle Jurassic deposits in this area can be divided into 7 types of litho-depositional facies: (i) coastal conglomerate; (ii) channel/shallow lake sandstone; (iii) shoreface sandstone; (iv) estuarine siltstone and mudstone; (v) deep marine shale; (vi) mass transport deposits; and (vii) turbidite.

These facies’ spatio-temporal distributions are closely related to their grain size. In the basin margin, Early Jurassic coarse-grained deposits are exposed, marking the opening of the basin, grading upward into shallow marine-shelf deposits. In the Middle Jurassic, the basin margin was uplifted corresponding to continental depositional environment, while the basin centre was filled by outer shelf deposits, reflecting a deepening process. Interbedding with these deposits are near shore and estuarine deposits.

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Published
2022-04-18
How to Cite
Bui, H. H., & Nguyen, Q. T. (2022). Early-Middle Jurassic lithological and depositional facies of the Da Lat back-arc basin. Petrovietnam Journal, 3, 4 - 13. https://doi.org/10.47800/PVJ.2022.03-01
Section
Articles