Abstract:

Based on the metallogenic geological backgrounds and mineralization characteristics of Mo deposits of different periods in Henan Provence, the metallogenic models have been established and regularities of metallogenesis have been summarized for main types of Mo deposits. The synthetic information prediction models of porphyry-skarn Mo deposits corresponding to conceptual geological model have been established based on the data processing of synthetic information and the discussion about the forecast factors of different types of Mo deposits. The most important molybdenum deposits of Early Cretaceous belongs to offshore Western Pacific tectonic domain and are controlled by the East Qinling-Dabie intracontinental magmatic arc. Because of strong magmatic activity, the large coarse-grained granite batholith of shallow-derivation, hypabyssal and fast tectonic emplacement and fine-grained granite, granite porphyry and intrusive breccia of slightly deep-derived, hypabyssal and thermal emplacement occur in the same level of denudation. Not only  small intrusions contain large deposits, but also large deposits at the margins or sides of big batholiths. Although the prediction variables are slightly different for same type of mineral resources at different tectonic settings, usually the low residual gravity, positive magnetic anomaly of ΔT reduction-to-the-pole and gradient mode can be used to delineated the contact zone and the positive anomaly of the Mo metallogenic factor score and the negative anomaly of the Pb-Zn-Ag metallogenic factor score can be used to define metallogenic range of the Skarn-Porphyry Mo-W deposits. The position of concealed ore body can be effectively predicted by the comprehensive profile survey of CSAMT-SIP-crack geochemistry.

Key words: granite, granite porphyry, Mo deposit, metallogenic model, regularity of metallogenesis, synthetic information, prediction model