Ages and compositions of primary and secondary allanite from the Lala Fe–Cu deposit, SW China: implications for multiple episodes of hydrothermal events
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- 作者：Wei Terry Chen (1)
Mei-Fu Zhou (1) - 关键词：Allanite ; U–Th–Pb age ; Multiple hydrothermal events ; Kangdian IOCG Province ; Lala deposit
- 刊名：Contributions to Mineralogy and Petrology
- 出版年：2014
- 出版时间：August 2014
- 年：2014
- 卷：168
- 期：2
- 全文大小：3,034 KB
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Mei-Fu Zhou (1)
1. Department of Earth Sciences, University of Hong Kong, Pokfulam Road, Hong Kong, China - ISSN：1432-0967
文摘
Numerous Fe–Cu deposits in southwestern China form the Kangdian Iron-Oxide Copper-Gold (IOCG) metallogenic Province. These deposits have a close association of Fe-oxides and Cu-sulfides formed at different stages, which are possibly related to multiple hydrothermal events. In this paper, U–Pb dating and chemical analyses on allanite from different stages of the Lala deposit were used to constrain timing and origin of such events. Allanite occurs as disseminated grains or patches in Fe–Cu ores and is closely associated with chalcopyrite, molybdenite, calcite and minor titanite, postdating magnetite and apatite. High-resolution backscattered electronic (BSE) imaging, electron microprobe compositions and X-ray scanning profiles demonstrate that REE-rich primary allanite was replaced by later, relatively porous and REE-poor secondary allanite. Such a replacement was promoted by interaction between primary allanite and fluid fluxes infiltrating the minerals, following an exchange scheme of REE3+?+?Fe2+?→?Ca2+?+?Al3+. The secondary allanite has higher Fe3+/(Fe3++Fe2+) ratios and U contents, indicating involvement of relatively oxidized fluids during alteration. The alteration has also produced unidentified secondary REE minerals in fractures, indicating re-deposition of some of the removed REEs. The primary and secondary allanites are dated by in situ LA-ICP-MS technique and have U–Pb ages of 1,067?±?41?Ma and 880-50?Ma, respectively. The ~1.07?Ga primary allanite was contemporaneous with the main Mo–Cu–LREE mineralization with a molybdenite Re–Os age of ~1.08?Ga. The 880-50?Ma secondary allanite is comparable with the Ar–Ar ages (890-30?Ma) of biotite from hosting schists and undeformed sulfide veins occurring throughout the Kangdian Province, suggesting that such an event was possibly syn-deformational and represents a younger hydrothermal event. Occurrences of both primary and secondary allanites suggest that the mineralization may have involved multiple tectonothermal events including the ~1.05-.1?Ga intra-plate and subsequent 960-40?Ma arc magmatism in the Kangdian region.