Raman spectroscopic and microthermometric studies of authigenic quartz (the Pepper Mts., Central Poland) as an indicator of fluids circulation

Beata Naglik; Tomasz Toboła; Lucyna Natkaniec-Nowak; Jarmila Luptáková; Stanislava Milovská

doi:10.1016/j.saa.2016.10.047

Raman spectroscopic and microthermometric studies of authigenic quartz (the Pepper Mts., Central Poland) as an indicator of fluids circulation

Spectrochim Acta A Mol Biomol Spectrosc. 2017 Feb 15:173:960-964. doi: 10.1016/j.saa.2016.10.047. Epub 2016 Oct 29.

Authors

Beata Naglik¹, Tomasz Toboła², Lucyna Natkaniec-Nowak³, Jarmila Luptáková⁴, Stanislava Milovská⁴

Affiliations

¹ AGH-University of Science and Technology, Department of Mineralogy Petrography and Geochemistry, Mickiewicza 30, 30-059 Krakow, Poland. Electronic address: beata.naglik@op.pl.
² AGH-University of Science and Technology, Department of Economic Geology, Mickiewicza 30, 30-059 Krakow, Poland.
³ AGH-University of Science and Technology, Department of Mineralogy Petrography and Geochemistry, Mickiewicza 30, 30-059 Krakow, Poland.
⁴ Earth Science Institute, Slovak Academy of Sciences, Ďumbierska 1, 974-11 Banská Bystrica, Slovakia.

PMID: 27837739
DOI: 10.1016/j.saa.2016.10.047

Abstract

Differently colored authigenic quartz crystals were found as the druses compound within mudstone heteroliths from the Pepper Mts. Shale Formation (Cambrian unit of the Holy Cross Mts., Central Poland). The genesis of this mineral was established on the basis of fluid inclusion study. Raman microspectroscopy was the key instrumental technique to identify the nature of the compounds trapped in the fluid inclusions. Methane (2917cm^-1) or water vapor (broad band ~2500-3000cm^-1) occur within two-phased primary inclusion assemblages, while nitrogen (2329cm^-1) associated with methane and trace amount of carbon dioxide (1285, 1388cm^-1) occur within secondary fluid inclusion assemblage. Temperatures of homogenization of primary fluid inclusions was obtained on the basis of heating experiments and ranged from 171° to 266°C. These values are much higher than expected for the diagenetic system without metamorphic changes what may imply hydrothermal origin of quartz crystals. The source of fluids is uncertain as in the Holy Cross Mts. there was no volcanic activity to the end of Late Devonian. However, fluids originated in metamorphic basin could use deep faults as the migration paths.

Keywords: Authigenic quartz; Fluid inclusion; Microthermometry; Raman spectroscopy; The Pepper Mts..