DOI: 10.1016/j.tecto.2020.228454
论文题名: Geological model and development of the Cenozoic Wiang Pa Pao Basin, Chiang Rai Province, Northern Thailand, based on gravity data modelling and surface structural interpretation
作者: Mangkhemthong N. ; Morley C.K. ; Kanthiya S. ; Chaisri S.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 786 语种: 英语
中文关键词: 3-D Gravity modelling
; Cenozoic tectonics of Thailand
; Potential field data
; Riedel shear structures
; Transtensional basin
; Wiang Pa Pao Basin
英文关键词: Buildings
; Surface structure
; Geological modeling
; Gravity anomalies
; Gravity interpretation
; Gravity modelling
; Metasedimentary rocks
; Northern Thailand
; Structural development
; Structural interpretation
; Strike-slip faults
; Bouguer anomaly
; Cenozoic
; data interpretation
; depocenter
; gravity field
; modeling
; rifting
; strike-slip fault
; Chiang Rai
; Northern Region [Thailand]
; Thailand
英文摘要: 3-D Inverse gravity modelling, constrained by surface geological data across the Neogene Wiang Pa Pao Basin (WPB), Northern Thailand, provides new subsurface models of the basin geometry and its structural development. The intermontaine WPB is seismically active and exhibits many geothermal sites; both are indicative of active fault zones. Six hundred thirty-six terrestrial gravity stations with ~500 m spacing were acquired. The residual Complete Bouguer Anomaly map (CBA) reveals an N–S elongate basin characterized by gravity lows bounded by gravity highs on the eastern margin of the basin (metasedimentary basement), and moderate gravity anomalies on the western margin (granitic basement). Structural edge detection revealed N–S trending faults along the eastern and western margins linked by NE–SW and NW–SE trending lineaments. The 3-D gravity model indicates an asymmetric graben; with a maximum depocenter depth of ~1300 m. Surface structure and seismicity confirm the gravity interpretation that the WPB is a dextral transtensional basin characterized by WSW–ENE trending R'-shears and NNE–SSW R-shears distributed in duplex-like geometries along the N–S trending principal displacement zone. The WPB displays unusually well-developed R’-shears, where Palaeozoic metasedimentary rocks in the basement and Cenozoic basin sediments are present, these faults disappear to the south, where the main N–S fault resides entirely within the granite. The WPB is associated with Cenozoic multi-phase rifting: in the Late Oligocene–Miocene, major rift basins formed under W–E extension, strongly influenced by WSW–ENE to NE–SW and NW–SE pre-existing trends. In the Latest Miocene–Recent, the younger basins, including the WPB, underwent dextral strike-slip along new and existing N–S dextral fault trends. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170656
Appears in Collections: 气候变化与战略
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作者单位: Department of Geological Sciences, Chiang Mai University, Chiang Mai, 50200, Thailand; PTT Exploration and Production Public Company Limited, Bangkok, 10900, Thailand; Department of Physics and Materials Science, Chiang Mai University, Chiang Mai, 50200, Thailand
Recommended Citation:
Mangkhemthong N.,Morley C.K.,Kanthiya S.,et al. Geological model and development of the Cenozoic Wiang Pa Pao Basin, Chiang Rai Province, Northern Thailand, based on gravity data modelling and surface structural interpretation[J]. Tectonophysics,2020-01-01,786