Determination of Tourmaline Composition in Pegmatite From Buldan, Denizli (Western Anatolia, Turkey) Using XRD, XRF, and Confocal Raman Spectroscopy

KORALAY T., KADIOĞLU Y. K., Jiang S.

SPECTROSCOPY LETTERS, cilt.46, sa.7, ss.499-506, 2013 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 46 Sayı: 7
  • Basım Tarihi: 2013
  • Doi Numarası: 10.1080/00387010.2012.760102
  • Dergi Adı: SPECTROSCOPY LETTERS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.499-506
  • Anahtar Kelimeler: Buldan pegmatite, Raman spectroscopy, schorl, tourmaline, XRD, CRYSTAL-STRUCTURE, MG
  • Ankara Üniversitesi Adresli: Evet

Özet

Tourmaline minerals observed in different geologic environments show significant variations in terms of chemical compositions. Determination of tourmaline species gives useful petrogenetic information about both igneous and metamorphic environments. Microscopic, XRD, XRF, and confocal Raman spectroscopic features of tourmaline segregations that are 2-4cm thick, dark-blue to black in color, and mostly fractured occurring in the Buldan pegmatite are reported. Under the microscope, tourmaline samples show indigo blue, light blue, and olive-brown pleochroism with a thin long columnar, bladed shape. They exhibit distinctive enrichments in Fe2O3 (7.83-10.16wt%), V (245.0-591.0ppm), Sn (70.1-147.3ppm), W (1076.0-1887.0ppm), U (1.2-18.2ppm), and Th (9.6-28.0ppm). In terms of geochemistry, the tourmaline samples are schorl with Fe/(Fe+Mg) ratios of 0.65-0.74 and Na/(Na+Ca) ratios of 0.88-0.93. Five characteristic bands of tourmaline samples are observed at 1050, 710, 370, 220-245, and 185cm(-1). Tourmaline segregations in the Buldan pegmatite are schorl in composition and are probably generated from Li-poor granitoids and their associated pegmatites.