The Ailaoshan poly-metallic mineralization concentrated area (MCA) consists of the well known Ailaoshan metallogenic belt and adjacent mineral districts and/or deposits. Located in an area of several complex and inter...The Ailaoshan poly-metallic mineralization concentrated area (MCA) consists of the well known Ailaoshan metallogenic belt and adjacent mineral districts and/or deposits. Located in an area of several complex and intersecting tectonic units, the Ailaoshan poly-metallic MCA is controlled by deep crustal and mantle tectonism. Through interpretation of remote sensing images, we identified a large ring structure system that surrounds the MCA. This ring structure encloses regional deep-crustal faults, ductile shear zones, geothermal anomalies, magmatic rocks, and the major mineral deposits, all of which are the reflections of deep tectonic geodynamics that have been long active in this area. Geophysical data indicate that the crust is comprised of relatively stable two or three layers, with some irregular lower-velocity belts. The Moho in the ring sutures occurs as an area of local uplift. There exists an obvious transitional zone between the crust and mantle boundaries. Asthenopheric mantle shows multi-layer upwelling, which indicates multiple events during different geological epochs. It is believed that these mantle events or pulses were responsible for the formation of the regional shear zones, magmatic rocks, and polymetallic orebodies. Furthermore, an integrated metallogenic dynamics model related to the asthenopheric upwelling pulses in the MCA is established, defining events as old as Late Paleozoic.展开更多
What is called ＂the relationship between nature （heaven） and man＂ or between the way of heaven and human affairs has been a focus of concern for over 2,000 years and also a fundamental issue in historical research...What is called ＂the relationship between nature （heaven） and man＂ or between the way of heaven and human affairs has been a focus of concern for over 2,000 years and also a fundamental issue in historical research. Here, we need to give thought to three points. The first is spatial difference, or the great variation in the relationship between man and nature across China＇s vast territory; the second is difference across time, as evolutionary changes in human society give rise to different relationships between man and the environment; and the third is the formation and development of a unitary multi-ethnic Chinese empire and its effect on man-land relationships. The following issues should receive serious attention in future research on environmental history： first, the importance of the regional studies approach in researching these relationships; second, the major role of human factors in their evolution; third, the impact of regional politics on these relationships, in that capital cities tend to suffer most from environmental degradation; and last but not least, the changes in these relationships in the course of modernization and urbanization over the past few decades.展开更多
基金Supported by National Key Technology R & D Program (Grant No. 2006BAB01B10)National Basic Research Program of China (Grant No. 2009CB421000)
文摘The Ailaoshan poly-metallic mineralization concentrated area (MCA) consists of the well known Ailaoshan metallogenic belt and adjacent mineral districts and/or deposits. Located in an area of several complex and intersecting tectonic units, the Ailaoshan poly-metallic MCA is controlled by deep crustal and mantle tectonism. Through interpretation of remote sensing images, we identified a large ring structure system that surrounds the MCA. This ring structure encloses regional deep-crustal faults, ductile shear zones, geothermal anomalies, magmatic rocks, and the major mineral deposits, all of which are the reflections of deep tectonic geodynamics that have been long active in this area. Geophysical data indicate that the crust is comprised of relatively stable two or three layers, with some irregular lower-velocity belts. The Moho in the ring sutures occurs as an area of local uplift. There exists an obvious transitional zone between the crust and mantle boundaries. Asthenopheric mantle shows multi-layer upwelling, which indicates multiple events during different geological epochs. It is believed that these mantle events or pulses were responsible for the formation of the regional shear zones, magmatic rocks, and polymetallic orebodies. Furthermore, an integrated metallogenic dynamics model related to the asthenopheric upwelling pulses in the MCA is established, defining events as old as Late Paleozoic.
文摘What is called ＂the relationship between nature （heaven） and man＂ or between the way of heaven and human affairs has been a focus of concern for over 2,000 years and also a fundamental issue in historical research. Here, we need to give thought to three points. The first is spatial difference, or the great variation in the relationship between man and nature across China＇s vast territory; the second is difference across time, as evolutionary changes in human society give rise to different relationships between man and the environment; and the third is the formation and development of a unitary multi-ethnic Chinese empire and its effect on man-land relationships. The following issues should receive serious attention in future research on environmental history： first, the importance of the regional studies approach in researching these relationships; second, the major role of human factors in their evolution; third, the impact of regional politics on these relationships, in that capital cities tend to suffer most from environmental degradation; and last but not least, the changes in these relationships in the course of modernization and urbanization over the past few decades.
