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- Title
Faulting structure styles and their depositional filling response of the Paleogene margin of Shaleitian uplift, western Bohal Sea area.
- Authors
Kang Hai-liang; Lin Chang-song; Niu Cheng-min; Ye Dong-qing; Zhuang Xing-yan
- Abstract
The NW-trending pre-existing faults and the NE-trending early faults controlled the structural evolution of the Shaleitian uplift margin. According to the characteristics of the main faults, the combination of the main faults, the early synsedimentary faults and the companion faults, Shaleitian uplift margin accommodates the following six kinds of the Paleogene faulting structure styles: concordant fault terrace gentle-slope margin, major low-angle faulted gentle-slope margin, straight normal faulted gentle-slope margin, listric normal faulted steep-slope margin, ramp-flat normal faulted steep-slope margin and platy normal faulted steep-slope margin. Different types of faulted slope-breaks and palaeogeomorphology formed by fault structural styles with early valley developed on the uplift controlled the input and distribution of material source and resulted in different types of raised edge sedimentary filling characteristics. As a result, the plane distribution and vertical evolution of sedimentary facies belts from the uplift to the depression have certain regularity. In concordant fault terrace gentle-slope margin, the low fan-delta developed in early period and the thick braided delta front developed in later period in control of the early basin-margin slope. The main fault which separates Shaleitian uplift and the adjacent depression controlled the development of the high fan-delta in early period and the braided delta in later period. The syndepositional fault which developed on the major low-angle normal fault controlled the deposition of the low fan delta and turbidite fan in the Es3 member and then developed braided river delta and shore shallow lake in the major low-angle faulted gentle-slope margin. The transgressive and high braided river deltas developed in Shahejie Formation in the straight normal faulted gentle-slope margin, the thick braided deltas front developed below the slope break and the delta plain and small filled valleys developed on the slope break in Dongying Formation. The sedimentary filling has a layered structure in the vertical direction in the edge of the steep slope. From early to late stage,the early alluvial fan or fan delta facies evolved into braided river delta, the steep slope controls the development of the low fan delta,and the delta plain and small filled valleys developed on the slope break.
- Subjects
GEOLOGIC faults; SEDIMENTATION &; deposition; PALEOGENE
- Publication
Natural Gas Geoscience, 2017, Vol 28, Issue 2, p1
- ISSN
1672-1926
- Publication type
Abstract
- DOI
10.11764/j.issn.1672-1926.2017.01.001