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Gold mineralization assisted by crustal melting: the case of the Maevatanana mesothermal gold deposit, Madagascar

  • Xi-An YangEmail author
  • Emmanuel John M. Carranza
  • Jie Wu
  • Yuchuan Chen
  • Shanbao Liu
  • Jiajun LiuEmail author
Original Paper
  • 29 Downloads

Abstract

The genesis of mesothermal Au-quartz vein deposits, which are among the more economically important type of Au deposits, is still under debate. There are two main theories, proposed in the literature, for the subsequent formation of these deposits in suitable structure involved: (1) Au-bearing ore fluid was derived from magmatic intrusions; or (2) Au was extracted from a greenstone belt by metamorphic fluids. In this paper, we report geochemical data from the mesothermal Maevatanana Au deposit in Madagascar, from which we deduce, based on synthesis of these data with field observations and with data from previous studies, that Au-quartz veins and silicified gneisses in the footwall of the granite dike were derived from both greenstone rocks and magmatic intrusions. From this interpretation, we propose a two-stage fertilization model for the mesothermal Maevatanana Au deposit. The first stage involved recycling of metal-fertilized lower crust. The second stage involved emplacement of granitic magma into the greenstone belt, resulting in increase in temperature of the host rock, and subsequent low-degree partial melting of the crust produced volatile-rich high-silica melts. Subsequently, Au-rich fluid was extracted from the granitic magma and convection in the magma reservoir caused by ascent of the less-dense volatile-rich high-silica melt and settlement of crystals (e.g., plagioclase) resulted in the formation of ore-forming fluids at the top of the magma reservoir. Finally, the Au-rich fluids were carried by magmatic dikes and transported from the magma reservoir to shallow host structures to form the mesothermal Maevatanana Au deposit.

Keywords

Crustal melting Mineralization Gold deposit Madagascar Greenstone belt 

Notes

Acknowledgments

Two anonymous reviewers provided insightful comments that significantly improved the quality of this manuscript.

Funding information

This research was jointly supported by the China Postdoctoral Science Foundation (project 2013 M541000) and the “Preliminary Reconnaissance on the Tectonic Setting and Mineral Exploration Potential of the Global Giant Metallogenic Belts” project of the China Geological Survey (CGS; project 12120113102100).

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© Saudi Society for Geosciences 2019

Authors and Affiliations

  1. 1.State Key Laboratory of Nuclear Resources and EnvironmentEast China University of TechnologyNanchangChina
  2. 2.Geological Sciences, School of Agriculture, Earth and Environmental SciencesUniversity of KwaZulu-NatalDurbanSouth Africa
  3. 3.Economic Geology Research Centre (EGRU)James Cook UniversityTownsvilleAustralia
  4. 4.School of EnvironmentUniversity of AucklandAucklandNew Zealand
  5. 5.Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijingChina
  6. 6.State Key Laboratory of Geological Process and Mineral ResourcesChina University of GeosciencesBeijingChina

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