Analysis and Modelling of Airborne Geophysical Data in the Petchabun Volcanic Belt, Northern Part of Central Thailand
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Abstract
New re-processed airborne geophysical data together with relevant current field verification as well as previous geochronological, geochemical and geological investigations lead to the clarification of the complex structures and tectonic evolution in Phetchabun volcanic belt covered by thick Cenozoic deposits. During the PermoCarboniferous period, the original elongate units in central domain corresponding to intrusive igneous bodies may have occurred in association with subduction of the Nakhonthai oceanic plate beneath the Indochina continental plate. Additionally, the trench zone may have occurred by cause of eastward subduction in the western domain with correspond to deep basin filled by Permian deep marine sedimentary rocks of Nam Duk Formation whereas, paleo-back arc basin in the eastern and northern domains filled by shallow marine sedimentary rocks of Pha Nok Khao and Hua Na Kham Formation. Subsequently, during the Permo-Triassic period, the elongate units were shear as ductile and brittle structures which are deformed by represent of the accreted zone in central domain besides the mesothermal gold deposit in this zone. The structural configuration of this stage is characterized by east-west compressional stress, ring units of paleo-volcanic arc centers and the presence of circular units representing equigranular intrusive bodies from the result of eastward subduction. On the contrary, the east-west extensional stress during the Triassic period is inferred to be deposited the epithermal gold and contemporaneous diachronous with the subsidence in volcanic arc of eastern domain with uplift of the preliminary Khorat basin in northern 2 sub-domain. Finally, the spot units representing shallow porphyritic intrusive bodies occurred along the subsidenced fault zone during this stage.
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Copyright © 2008 Department of Geology, Faculty of Science, Chulalongkorn University. Parts of an article can be photocopied or reproduced without prior written permission from the author(s), but due acknowledgments should be stated or cited accordingly.
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