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Geological Features and Formation Processes of the M akeng F e Deposit, C hina
Author(s) -
Zhang Zhenjie,
Zuo Renguang,
Cheng Qiuming
Publication year - 2015
Publication title -
resource geology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.597
H-Index - 43
eISSN - 1751-3928
pISSN - 1344-1698
DOI - 10.1111/rge.12070
Subject(s) - skarn , mafic , geology , geochemistry , mineralization (soil science) , intrusion , pluton , layered intrusion , geochronology , hydrothermal circulation , fluid inclusions , seismology , tectonics , soil science , soil water
Abstract Recent studies have revealed that the M akeng F e deposit is a skarn type deposit. However, the skarns in M akeng, occurring primarily between limestone and sandstone, are not typically associated with limestone and plutons. Different periods of intrusions, e.7. H ercynian mafic intrusions and Y anshanian (i.e. early C retaceous) D ayang– J uzhou granitic intrusion, occurred in the M akeng deposit district. In this study, the formation processes of the skarns and F e mineralization are constrained by detailed fieldwork, petrology, geochronology, and geochemistry. Skarns and F e mineralization intersecting the H ercynian mafic intrusions are observed in consecutive specimens from the 106# tunnel. They suggest that the skarn formation and F e mineralization occurred after the H ercynian mafic intrusions and are related to the later Y anshanian D ayang– J uzhou granitic intrusion. The geochronological characteristics of weakly skarn‐altered diabases, the decreasing nature of F e contents in altered diabase, and the major element compositions of pyroxenes and garnets also support that H ercynian mafic intrusions are strongly reformed by Y anshanian granitic magmas and the F e migrated from mafic intrusion was responsible for formation of iron ore.