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Geochemistry and Geological Implications of Mafic Dyke Swarms in the Southwestern Area of Zhongtiao Mountains
SHU Wulin,HOU Guiting,WANG Chuancheng,XIAO Fangfeng,LI Le
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Fractals of Oil and Gas Field Reserve Distribution in Outer Continental Shelf (OCS), Gulf of Mexico Basin
JU Wei,HOU Guiting,XIAO Fangfeng
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Study on Structural Stress Fields since Permian, Junggar Basin and Adjacent Areas
XIAO Fangfeng,HOU Guiting,WANG Yanxin,LI Le
Acta Scientiarum Naturalium Universitatis Pekinensis
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639
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Three periods of structural stress fields can be recognized since Permian in Junggar Basin and adjacent areas based on structural evolution analysis, that is the end of Permian, the end of Jurassic (or lasting to the end of K1) and Neogene. Their maximum principal stress orientation are respectively NWW-NW, near SN, and NNE, which are derived from the occurrence data of the stress-response structures, i. e. , dykes, joints, slickensides, folds and faults. Furthermore, the authors simulated the stress field since Neogene based on 2D finite-element method, to deeply analyze the following questions: distribution and direction of stresses in the whole basin; influence of the geometry model for the stress field; as well as the dynamics of structures related to stress field.
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Study onthe Emplacement Mechanismof Dyke Swarms Using Magnetic Fabric, Western Shandong Province
LI Le,HOU Guiting,WANG Chuancheng,WANG Yanxin,XIAO Fangfeng
Acta Scientiarum Naturalium Universitatis Pekinensis
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Mesoproterozoic mafic dyke swarms are extensively developed in the Western Shandong, the east of the North China Craton, which intruded the Early Precambrian crystal basement. The dorminant orientation of these mafic dykes is nearly N-S trending. The mafic dyke swarms in the Western Shandong belong to LREE enrichment magmatic rocks, and are formed in a continental rift environment according to petrology and geochemistry of these mafic dykes. The flow structures and geometry evidences of the dykes indicatethat the magma source of these dykes intruded the pre-existingtensional rupture . The dyke swarms in the Western Shandong intruded from North to South. Angles between the long axis orientations of magnetic fabric textures and the middle line of dykes suggest that the flow direction of these dykes is from North to South. Further it indicate that the dykes intruded fromNorth to South. These flow structures, geochemistry and magnetic fabric textures suggest that magma come from enriched mantle magma source beneath the Yanliao-Zhongtiao aulacogens based on space-time relationship between the mafic dyke swarms and Yanliao-Zhongtiao aulacogens.
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