An approach to the low-velocity and low-resistivity zones in south-central Xizang and their bearings to mineralization
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摘要: 20世纪70年代以来,“青藏高原热”的地学研究对地质构造、地球物理和地球化学等方面的资料和数据的积累,建立了青藏高原大地构造体系和特提斯喜马拉雅的形成演化模式及地壳层圈结构模式;20世纪末至今,喷流型矿床的发现和国土资源大调查项目的全面实施,使得“青藏高原”再次成为新的热点研究区。笔者试图将前人的基础地学研究成果与矿床的最新研究成果融为一体,进一步探讨全国重点成矿片区“一江两河”(雅鲁藏布江,拉萨河,年楚河)成矿带的成矿动力学与矿床时空分布规律。笔者认为,该区地壳深部区域性展布的低速低阻层(部分熔融状态的高温热源体)是导致“一江两河”地区不同时代、不同成因类型矿床形成的主导因素之一。Abstract: Since 1970s, numerous studies have been made on the Qinghai-Xizang Plateau in southwestern China. The integration of geological, tectonic, geophysical and geohemical data led to the construction of the models for the formation and evolution of the tectonic systems on the Qinghai-Xizang Plateau and in the Tethyan Himalayas. Before the turn of the century, the discovery of the sedex deposits and investigation of the national projects on geological survey have been incentive to further study of the Plateau. The metallogenic dynamics of the metallogenic zones along the Yarlung Zangbo, Lhasa and Nyangqu Rivers, and spatio-temporal distribution of the ore deposits in these regions are explored, referenced to the previous and current results of research. The widespread distribution of the low-velocity and low-resistivity zones (partly melted high-temperature heaters) is believed to be responsible for the formation of the ore deposits of varying ages and genetic types along the above-mentioned rivers.
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