Geological and Geochemical Characteristics and Genesis of Ferromolybdenum Deposit in Wudaoling,Heilongjiang Province
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- Category: Molybdenum knowledge
- Published on 28 October 2015
- Written by xinyi
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Geological and Geochemical Characteristics and Genesis of Ferromolybdenum Deposit in Wudaoling,Heilongjiang Province
Wudaoling ferromolybdenum deposit is a typical skarn deposit in Lesser Xing'an range-Zhangguangcai range metallogenic belt. Orebodies are hosted in skarn zone between pyritized quartz porphyry,alterated product of alkali-feldspar granite,with tuffaceous sandstone and acid tuff of Wudaoling Formation. The mineral assemblage of skarn was composed of garnet,diopside,actinolite and epidote,etc. The orebodies are irregular in shape,and characterized by branch and composite form.
The types of ores included molybdenum,iron and pyrite ores. The alkali-feldspar granite and quartz porphyry closely related to mineralization,are metaluminous-peraluminous in nature,belonging high potassium calc-alkaline I-type granties. The granties were enriched in LILE(such as Rb,K,U) and depleted in HFSE(such as P,Ti),which was compatible with the geochemical characteristics of subduction granites. LA—ICP—MS U—Pb zircon dating showed that the formation age of quartz porphyry and alkali feldspar granites were 193.6±1.1 Ma and 193.9±1.3 Ma,respectively. Combining with regional geological evolution characteristics,the authors suggested of that the formation of Wudaoling ferromolybdenum deposit was related to the extended environment after subduction of the ancient Pacific Plate. The metallogenic epoch was Early Jurassic(186±2 Ma) and genesis belonged to skarn type.
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