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| Genetic Mineralogy Analysis on the Mineralization Process of Skarn Iron Deposit in Han-Xing Area, Southern Taihang Mountains |
| ZHANG Ju-quan1, WANG Ji-zhong2, LI Sheng-rong3, SHEN Jun-feng3, LU Jing1 |
1. Hebei GEO University, Resource College, Shijiazhuang 050031, China;
2. Hebei GEO University, School of Gemology and Materials Technology, Shijiazhuang 050031, China;
3. School of Earth Sciences and Resources, China University of Geosciences Beijing, Beijing 100029, China |
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Abstract In this study, genetic mineralogy analysis has been used to constrain the origin of skarn type iron deposits in the Han-Xing area. Composition, structure and age of identified minerals in the magmatic-hydrothermal system were used to discuss the controlling factors of Fe enrichment in ore-forming process, and establish the metallogenetic model of such iron deposits. Results showed that there are two types of magma evolution processes in this area, forming two individual metallogenic systems. In the hornblende diorite-diorite metallogenic system, high-Mg diorite and Fe-rich ore-forming fluid were formed by fractional crystallization of magnesium-rich amphibole at high oxygen fugacity condition. But in diorite-monzonite metallogenic system, 2.5 Ga iron-rich metamorphic basement was assimilated into the magma, and provided countable mineralization material. Reaction between oxidized hydrothermal fluids and Ca-rich carbonate would form Fe-rich skarn, such as andradite, consuming large amounts of Fe so that the fulids would be Fe poor and be unfavorable in Fe mineralization. When ore-forming fluids reacted with Mg-rich carbonate, Fe-poor skarn, such as diopside, would not significant lower Fe in fluids. Such fluids would remain Fe-rich and form iron deposits.
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