Interpretation of buried basement in the southwestern Athabasca Basin, Canada, from integrated geophysical and geological datasets
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Abstract:
Recent discoveries of basement-hosted uranium deposits in the Patterson Lake corridor in the southwestern Athabasca Basin of Canada have brought vigorous exploration interest to the region. New lithostratigraphic constraints, geochronology and airborne geophysical surveys have dramatically improved the understanding of the host basement geology, warranting a re-examination of the remote predictive mapping and geophysical responses of the buried basement rocks. This study took a two-step approach to examine the regional basement geology and architecture. First, a mosaic of the long-wavelength response of potential field (gravity and magnetic) datasets was examined to divide the basement into regional domains based on bulk physical property variations. The interpretive geological model was then refined using textural and lineament analysis of new airborne gravity and magnetic datasets, geological drill hole logs and magnetic susceptibility measurements. The new basement map identifies and updates major features including a crustal-scale structure that separates the southern Tantato Domain from the newly defined eastern Taltson Domain. This structure may have played a role in localizing fluid flow in the Patterson Lake corridor, defining the spatial extents of structurally controlled buried felsic intrusions, and redefines the boundaries of the Taltson, Clearwater and Tantato Domains. In addition, the potential field enhancements delineated significant regional faults that controlled the geometry of Paleoproterozoic cover sequences and have implications for understanding the crustal architecture of the southern Rae Province. These new interpretations shed light on the tectonic history of the region to support on-going exploration activities and delineate regionally prospective areas in this understudied area of the Canadian Shield. Thematic collection: This article is part of the Uranium Fluid Pathways collection available at: https://www.lyellcollection.org/cc/uranium-fluid-pathwaysKeywords:
Basement
The North Yellow Sea basin (50 000 km~(2) in area) is lowly explored and China has no drilling in it, the Jiaolai basin of China is a land basin close to the North Yellow Sea basin and the peripheral explored basin of the Shengli Oilfield, and the Anju basin has the smallest area but most drilling. Lithology, sedimentation and oil-bearing characteristics of the three basins are introduced in the paper.
Lithology
Sedimentation
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In order to enlarge the field of oil and gas exploration and seek more resources, this paper analyzes the geodynamic condition and basin formation mechanics of Xinganling basin group. It uses geochamical indexes to evaluate qualitatively the hydrocarbon potential of the basins and indicates that this basin group has experienced 3 periods of large structural movement, forming relatively 3 basin formation periods. Comprehensive analysis shows that upper Jurassic Mesozoic in each basin has a nice hydrocarbon condition. Station 22 and Emuerhe Member in Mohe Basin, Taipinglinchang Member in Sunwu jiayin Basin, Damoguaihe Member in Labudalin Basin and Jiufengshan Member in Dayangshu Basin are the favorable horizons of next exploration.
Basin modelling
Hydrocarbon exploration
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