The Geochemistry Feature and Geological Significance of Ore-Forming Granites in Caosiyao Molybdenum Deposit,Central Inner Mongolia,China
Located in Liangcheng uplift of Inner Mongolia massif (Axis) within the North China Craton, Caosiyao molybdenum is a newly discovered superlarge scale deposit.Caosiyao molybdenum deposit is a typical porphyry deposits, the ore-forming parent rock is granitic intrusives which is composed of porphyritic granite, granite, granite porphyry, quartz porphyry and characterized by high acidity, high potash and high aluminum, generally belongs to acid k-rich calc-alkaline series.In addition, the rock mass with the aluminium-containing index(A/CNK) of 1.20-2.49 which is rich in Tb, Nd, Ga and LREE(except Eu) and depleted in Eu, Ti, Sr and P, is highly differential A-type granite series.The isotopic dating has yielded a Zircon U-Pb age of rock firom 131 to 134 Ma, which is close to Re-Os age of molybdenite in deposit, suggesting both are the product of the Yanshanian tectonic-magmatic activity, preliminary study shows that the diagenesis and mineralization of Caosiyao was formed in the post-orogenic intracontinental rift during the period of tectonic regime transformation in the northern margin of North China Craton.
porphyry-type molybdenum deposit granite porphyry petrogeochemistry Inner Mongolia Caosiyao
WANG Fengxiang KAN Jiaqiang NIE Fengjun
Shijiazhuang University of Economics,Shijiazhuang Hebei 050031,China MLR Key Laboratory of Metalloge Shijiazhuang University of Economics,Shijiazhuang Hebei 050031,China MLR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Beijing 1000
国际会议
第十八届凯洛林国际地质学术研讨会(The 18th Kerulien International Conference on Geological)
石家庄
英文
17-22
2013-09-20（万方平台首次上网日期，不代表论文的发表时间）