Alteration Characteristics of Kfeldspar in Leimengou Porphyry Mo Deposit in Western Henan Province and Its Insight into Metallogenetic Process

Abstract

Abstract:

Leimengou Mo deposit in Western Henan Province is a typic porphyry Mo deposit in East Qinling Molybdenum belt. The deposit pervasively develops K-feldspar alteration,including vein type and whole rock alteration. The whole rock alteration charactered as the porphyry and the gneiss being potassic altered absolutely. Vein type alteration is represented by the K-feldspar slevage, K-feldspar fluorite vein amd K-feldspar halo beside the margin of quartz molybdenum veinnet. This paper analyzed the alteration features of K-feldspar, composition of altered minerals, X-ray powder diffraction and Pb isotope composition of types of altered K-feldspar. The compositions of feldspar show that K₂O is the main compontent; X-ray powder diffraction data suggest that K-feldspar are andesine microcline with alteration temperatures of 310-418 ℃.Pb isotope composition show that K in K-feldspar originates from mantle. According to the mantle derived characteristics of the ore forming fluid, combining with the geochemistry of Mo, we conducted that the K-feldspar alteration has a good interpretation on the metallogenic process.

Key words: K-feldspar alteration, X-ray diffraction, Pb isotope, Leimengou porphyry Mo deposit;Western Henan Province

CHEN Xiao-Dan, XIE Hui-Shou, HONG Huan. Alteration Characteristics of Kfeldspar in Leimengou Porphyry Mo Deposit in Western Henan Province and Its Insight into Metallogenetic Process[J]. Geoscience, 2012, 26(3): 478-488.

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