Petrographic Characteristics and Depositional Environment Evolution of Middle Miocene Sediments in the Thien Ung - Mang Cau Structure of Nam Con Son Basin

Authors

  • Pham Bao Ngoc PetroVietnam University, Viet Nam
  • Tran Nghi Hanoi University of Science, Viet Nam
  • Nguyen Trong Tin Vietnam Petroleum Geology Union, Viet Nam
  • Tran Van Tri General Department of Geology and and Minerals of Vietnam, Viet Nam
  • Nguyen Thi Tuyen Insitute for Geo-Environmental Research and Adaptation of Climate Change, Viet Nam
  • Tran Thi Dung Hanoi University of Science, Viet Nam
  • Nguyen Thi Phuong Thao Insitute for Geo-Environmental Research and Adaptation of Climate Change, Viet Nam

DOI:

https://doi.org/10.17014/ijog.4.3.143-157

Keywords:

calcareous sandstone, calcarinate sandstone, calcareous clayey siltstone, bituminous calcareous claystone, turbulent flow structure, Thien Ung - Mang Cau structure

Abstract

DOI: 10.17014/ijog.4.3.143-157

This paper introduces the petrographic characteristics and depositional environment of Middle Miocene rocks of the Thien Ung - Mang Cau structure in the central area of Nam Con Son Basin based on the results of analyzing thin sections and structural characteristics of core samples. Middle Miocene sedimentary rocks in the studied area can be divided into three groups: (1) Group of terrigenous rocks comprising greywacke sandstone, arkosic sandstone, lithic-quartz sandstone, greywacke-lithic sandstone, oligomictic siltstone, and bitumenous claystone; (2) Group of carbonate rocks comprising dolomitic limestone and bituminous limestone; (3) Mixed group comprising calcareous sandstone, calcarinate sandstone, arenaceous limestone, calcareous claystone, calcareous silty claystone, dolomitic limestone containing silt, and bitumen. The depositional environment is expressed through petrographic characteristics and structure of the sedimentary rocks in core samples. The greywacke and arkosic sandstones are of medium grain size, poor sorting and roundness, and siliceous cement characterizing the alluvial and estuarine fan environment expressed by massive structure of core samples. The mixed calcareous limestone, arenaceous dolomitic limestone, and calcareous and bituminous clayey siltstone in the core samples are of turbulent flow structure characterizing shallow bay environment with the action of bottom currents. The dolomitic limestones are of relatively homogeneous, of microgranular and fine-granular texture, precipitated in a weakly reducing, semi-closed, and relatively calm bay environment.

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Published

15-08-2017

How to Cite

Ngoc, P. B., Nghi, T., Tin, N. T., Tri, T. V., Tuyen, N. T., Dung, T. T., & Thao, N. T. P. (2017). Petrographic Characteristics and Depositional Environment Evolution of Middle Miocene Sediments in the Thien Ung - Mang Cau Structure of Nam Con Son Basin. Indonesian Journal on Geoscience, 4(3), 143–157. https://doi.org/10.17014/ijog.4.3.143-157

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