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《Geotectonica Et Metallogenia》 2001-02
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A PRELIMINARY STUDY ON THE SPATIAL-TEMPORAL FRAMEWORK OF TECTONO-FLUIDS AND METALLOGENIC PROCESSES AND POSSIBLE METALLOGENIC MODEL IN THE LANPING BASIN

LI Xiao-ming, HU Bao-qing (Changsha Institute of Geotectonics,Chinese Academy of Science,Changsha 410013,China)  
Abundant metal and salt deposits emerged in the Lanping Basin,western Yunnan province in the Meso-Cenozoic,which is a famous hydrothermal ore deposits belt in China.The unity of metallogenic spatial-temporal structure is a prerequisite and guiding ideology for studying metallogenic law and forecast.The paper synthesizes metallogenic epochs,spatial distribution of ore deposits and regional geological background,to give preliminary views as follows:(1)from the late Cretaceous to the Paleogene,metallogenic processes,such as copper deposits,occurred at the western edge of the basin;(2) major metallogenic processes occurred between the Paleogene and the Neogene,because the eastern and western edges subducted into and collided with bilateral continental blocks, and activity of the central axis fault was strong,which led to the large scale metallogenic fluids action,and metallogenic fluids were separated and transportated because of changing physical and chemical nature.Squeezed and uplifted,the Lanping basin became an intermontane basin to contain many kinds of fluid traps,different kinds of ore deposits with different scales.Simultaneously,fluids with volatile elements Hg,Sb and As rising along the central axis fault diffused into subordinate fractures,which led to Hg,Sb and As metallogenic process in the eastern compound anticline;(3)and later, ore deposits have suffered reformation and oxidization.Deep and large faults flourished in the basin, metallogenic processes were restricted to tectono-fluids evolution in the Lanping Basin, Simultaneously,occurrence of metallogenic processes changed nature of fluid and structural environment,which led to fluid recycle,multi-stages and zonation of metallogenic processes.
【CateGory Index】: P611
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