Abstract
Raman spectra of fluid inclusions in gem rubies from Yuanjiang deposit (China) within the Ailao Shan-Red River (ASRR) metamorphic belt showed the presence of compounds such as CO2, COS, CH4, H2S, and elemental sulfur (S8), accompanied by two bands at approximately 2499 and 2570 cm−1. These two frequencies could be assigned to the vibrations of disulfane (H2S2). This is the second case of the sulfane-bearing fluid inclusions in geological samples reported, followed by the first in quartzite from Bastar Craton of India. The H2S2 was likely in situ enclosed by the host rubies rather than a reaction product that formed during the cooling of H2S and S8, suggesting sulfanes are stable at elevated temperatures (e.g., >600 °C). By comparing the lithologies and metamorphic conditions of these two sulfane-bearing cases (Bastar and Yuanjiang), it is suggested that amphibolite facies metamorphism of sedimentary sequence that deposited in a continental platform setting might favor the generation of sulfanes. Sulfanes may play an important role in the mobilization of Cr that is essential for ruby crystallization.
Highlights
Numerous volatile species (e.g., CO2, CO, O2, C3 H8, and N2 ) in fluid inclusions are well documented in the literature [1]
They inferred that the disulfane or any other unknown S-H-bearing species that could dissociate into disulfane along the cooling path should be present before the fluid was trapped by quartz
Tailed description of fluid inclusion classification was given in Huang et al [10] and is is briefly μm in brieflyoutlined outlined in in Table
Summary
Numerous volatile species (e.g., CO2 , CO, O2 , C3 H8 , and N2 ) in fluid inclusions are well documented in the literature [1]. Given that sulfanes have been observed in both sulfur-bearing fluid inclusions and sulfur-free types, the possibility that disulfane formed by the post-entrapment reaction between molten sulfur and H2 S was ruled out by Hurai et al [4]. They inferred that the disulfane or any other unknown S-H-bearing species that could dissociate into disulfane along the cooling path should be present before the fluid was trapped by quartz. Many aspects regarding H2 S2 , e.g., the favorable formation condition, thermochemical stability, and its potential roles in the mobilization of specific elements, remain largely unclear and require further investigation
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