Essential sequence boundary and its application to lithostratigraphic division

LI Yongjun; NIU Haiping; YANG Gaoxue; WANG Ran; TONG Lili

2016 Vol. 35, No. 8

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LI Yongjun, NIU Haiping, YANG Gaoxue, WANG Ran, TONG Lili. Essential sequence boundary and its application to lithostratigraphic division[J]. Geological Bulletin of China, 2016, 35(8): 1304-1313.

Citation:

LI Yongjun, NIU Haiping, YANG Gaoxue, WANG Ran, TONG Lili. Essential sequence boundary and its application to lithostratigraphic division[J]. Geological Bulletin of China, 2016, 35(8): 1304-1313.

Essential sequence boundary and its application to lithostratigraphic division

1. Earth Science & Resources College, Chang'an University, Key Laboratory of Western China's Mineral Resources and Geological Engineering, Ministry of Education, Xi'an 710054, Shaanxi, China;
2. No.1 Institute of Geological Exploration, Gansu Provincial Bureau of Mineral Exploration and Development, Tianshui 741020, Gansu, China

Received Date: 22 April 2015

Revised Date: 28 April 2016

Publish Date: 15 August 2016

Abstract

Abstract

The essential sequence boundary is a major transformation in the vertical plane. It can be divided in downward succession into three groups, i.e., cycle/non-cycle essential sequence boundary (level Ⅰ interface), cycle/rhythmic essential sequence boundary (level Ⅱ interface) and fining-upward graded/coarsening-upward graded essential sequence (level Ⅲ interface). These interfaces are widely developed in clastic sedimentary rocks, and hence are important boundaries for subdividing geological mapping unit in detail. This unit is an important complement for traditional layering of sedimentary sequence and interface choosing for geological mapping unit. More importantly, it is a guide to the division of geological mapping unit, the analysis of sedimentary facies and the study of regional geology for particularly thick clastic units in the orogenic belt.
- thick clastic rocks; essential sequence boundary; lithostratigraphic division boundary; orogenic belt

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