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| Raman Spectral Characteristics of Multi-Stage Pyrite in Woxi Gold
Deposit, Hunan Province and Its Indicative Significance |
| ZHANG Jian, XU De-ru*, DAI Jun-feng |
School of Earth Sciences, East China University of Technology, Nanchang 330013, China
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Abstract This study determined the average Raman shifts (Ag/cm-1) of pyrites in three stages, Py1, Py2, and Py3, in the Woxi gold deposit, which were 378.3, 372.5, and 380.3, respectively, indicating the deposit have gone through a process of high pressure, low pressure，and high pressure; The average full width at half maximum (FWHM/cm-1) of the characteristic Raman peaks for Py1, Py2, and Py3 were 8.6, 10.8, and 9.1, suggesting that thetemperatureof ore fluids underwent a process of low temperature, high temperature, and low temperature. Based on previous research and regional tectonic evolution history, it inferred that Py1 was formed under the compressional background of the Late Jurassic, with ore fluids sourcing from regional metamorphic; Py2 was formed under extensional background of the Early Cretaceous, with ore fluids originating from post-magmatic hydrothermal activity which associated with large-scale magmatic events in extensional environment; Py3 was formed under the compressional background of the Early- to Middle Eocene, with ore fluids sourcing from regional metamorphic. By integrating the Raman characteristics of pyrites with the age of the main mineralization stage and the regional tectonic evolution history, it is possible to constrain further the ages of pyrites formed at the other stages, explore the formation process of deposit, extract ore-forming information, and expand the application of laser Raman spectroscopy technology in the field of geology.
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Received: 2023-03-29
Accepted: 2024-06-04
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Corresponding Authors:
XU De-ru
E-mail: xuderu@gig.ac.cn
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