The Ore-Forming Process of Washan Porphyrite Iron Deposits in the Ningwu District Associated with Iron Oxide Apatite (IOA) Deposits and Iron Oxide Copper Gold (IOCG) Deposits

被引：0
作者：
Liu, Zhen [1 ]
Xu, Wei [1 ]
Liu, Chunming [2 ]
Huang, Dezhi [2 ]
机构：
[1] Anhui Tech Coll Ind & Econ, Geol & Architectural Engn Inst, Hefei 230001, Peoples R China
[2] Cent South Univ, Sch Geosci & Infophys, Changsha 410083, Peoples R China
来源：
MINERALS | 2024年 / 14卷 / 08期
关键词：
Washan; Ningwu; porphyrite iron deposits; magma-type iron ores; ore-forming process; major elements; in-situ analysis of magnetite; YANGTZE-RIVER VALLEY; EASTERN CHINA IMPLICATIONS; O STABLE-ISOTOPES; TRACE-ELEMENT; KIRUNA-TYPE; MAGNETITE DEPOSIT; VOLCANIC-BASIN; EL-LACO; P MELT; FE;
D O I：
10.3390/min14080841
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
The Washan iron deposits in Ningwu district contain different magma-related genetic natures, including magmatic, magmatic-hydrothermal and hydrothermal types, and their ore-forming processes remain a subject of debate. To elucidate the ore-forming processes of iron ores from Washan, we present textural, major element analytical, and thermal data of magnetites from various ore bodies in Washan, probing the crystallization conditions and subsequent formation sequence of magnetites. SEM analysis with back-scattered electron (BSE) imaging reveals diverse magnetite textures, including mineral inclusions, exsolution lamellae, and recrystallization features, reflecting the transitional environment from magmatic to hydrothermal. Based on Ti, V, and Cr compositions of magnetite from different ore bodies, two distinct evolution trends of genetic processes are identified, including evolution paths from porphyry-type to IOA- and IOCG-type magnetite. High-resolution WDS mapping highlights the intensifying alterations during this process. Calculated magnetite crystallization temperatures among different types of magnetite range from 597 degrees C to 378 degrees C, suggesting a cooling trend from porphyry-type magnetite (similar to 558 degrees C) to IOA-type magnetite (similar to 515-439 degrees C) and IOCG-type magnetite (similar to 378 degrees C). These results underscore the significant role of magma-derived hydrosaline liquids and vapors in the formation of iron ores from Washan, where variations in the salinity of ore-forming fluids lead to different evolutionary paths for subsequent generations of magnetite. The metallogenic model of the Washan iron deposit suggests that highly saline, iron-rich fluids connect the varying geneses of magnetite, transitioning from deeply formed porphyry-type magnetite to IOA- or IOCG-type magnetite generated in the subaerial zone.
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页数：29
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