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Petrochemistry and Zircon LA-ICP-MS U-Pb Age of the Mangzong Porphyry Associated with Cu-Mo Mineralization in the Yulong Ore Belt

WU Jing1,2,LIANG Huaying1,MO Jihai3,ZHANG Yuquan1 and HU Guangqian1(1.CAS Key Laboratory of Mineralogy and Metallogeny,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,Guangdong,China;2.Department of Earth Sciences,Sun Yat-Sen University,Guangzhou 510275,Guangdong,China;3.Guangdong Province Neclear Industry Geological Bureau,Guangzhou 510800,Guangdong,China)  
The Mangzong porphyry Cu-Mo deposit is located at the middle of the Yulong porphyry copper ore belt in the eastern Tibet with outcrop area of 0.27km2. The Mangzong porphyry which associated with Cu mineralization intruded the Lower Permain siltstone interlaid with limestone and underwent strong alteration. The porphyry consists mainly of early stage diorite granite porphyry and late stage quartz monzogranite porphyry and K-feldspar porphyry. The early stage porphyry and late stage porphyry are different in major compositions. The late stage porphyry is relatively rich in K2O and SiO2. The Mangzong porphyry yields zircon LA-ICP-MS U-Pb age of(37.6±0.2) Ma(MSWD=1.41) ,which suggests that the Mangzong porphyry was emplaced during Late Eocene. Based on the structural condition of Eocene to Oligocene in eastern Tibet and the zircon LA-ICP-MS U-Pb age of the Mangzong porphyry,it is proposed that the Mangzong porphyry associated with Cu-Mo(Au) mineralization owe its origin to the local subduction of sinistral fault movement caused by the collision of India with Asia.
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