A STUDY ON THE CHROMIAN TREMOLITE FROM GULEMAN, ELAZlĞ

Yıl 1975, Cilt: 84 Sayı: 84, 38 - 45, 01.01.1975

İşık Kumbasar

Öz

Chemical composition, optical properties, D.T.A. curve, unit cell dimensions and indexed powder diffraction pattern of the chromium-rich tremolite from Guleman District are given. The chemical composition of this mineral is much more close to the chemical composition of hornblende. It contains 2.97 % Cr2O3 . Optical properties are obtained as: g=1.632, b=1.623, a= 1.615 all + 0.002 2V=90° ZlC=33°. Unit cell dimensions are: a=9.819 A°, b= 18.084 A°, c=5.200 A°, 104°40' V=893.44 A°3 c Dimension of this mineral is smaller than those found in tremolite and other hornblendes. Exothermic reaction at 830°C found for tremolite is not seen at D.T.A. curve of chromian tremolite from Guleman.

Anahtar Kelimeler

THE CHROMIAN, TREMOLITE, GULEMAN, ELAZlĞ

GULEMAN KROMLU TREMOLİTİ HAKKINDA

Öz

 Bu çalışmada Guleman kromlu tremolitin kimyasal bileşimi, optik özellikleri, D.T.A. eğrisi, birim hücre
boyutları ve indislenmiş X ışınları difraksiyonu pattern'i verilmiştir.
Kimyasal bileşimi daha çok hornblendinkine yaklaşmaktadır.
y=1.632, £=1.623, a=1.615 hepsinde ±0.002, 2V=90°, ZAC=33° dir. Birim hücre boyutları: a=9.819 A°,
b=18.084 A°, c=5.200 A°, #=104°40' V=893.44 A°3. c boyu tremolit ve diğer hornblendlerde rastlanan değerlerden
küçüktür. Tremolitin D.T.A. eğrisinde 830°C de bulunan ekzotermik reaksiyon, kromlu tremolitin eğrisinde görülmez.

Anahtar Kelimeler

GULEMAN, KROMLU, TREMOLİTİ

Kaynakça

• BUERGER, M.J. (1948): The role of temperature in mineralogy. The American Mineralogist, vol. 33, pp. 101-121.
• BORCHERT, H. (1961): Türkiye krom cevheri yataklarında yapılan etütlerden öğrendiklerimiz. M.T.A. Derg., no. 56, Ankara.
• CAMERON, M. & GIBBS, G.V. (1973): The crystal structure and bonding of fluor-tremolite. Am. Mineral., vol. 58, pp. 879-888.
• COLVILLE, P.A.; ERNST, W.G. & GILBERT, M.C. (1966): Relationships between cell parameters and chemical compositions of monoclinic amphiboles. Am. Mineral., vol. 51, p. 1727.
• DEER, W.A.; HOWIE, R.A. & ZUSSMAN, J. (1963): Rock-forming minerals, vol. 2, Longmans.
• ENGİN, T. & ANCOTT, J.W (1971): A microprobe study of chromites from the Andızlık-Zımparalık area, Southwest Turkey. Min. Mag., 38, pp. 76-82.
• ERNST, W.G. (1968): Amphiboles. Springer Verlag.
• HELKE, A. (1962): The metallogeny of the chromite deposits of the Guleman District, Turkey. Econ.Geol., vol. 57, no. 6, p. 954.
• KAADEN, G.v.d. (1959): On relationship between the composition of chromites and their tectonic-magmatic position in peridotite bodies in the SW of Turkey. M.T.A. Bull., no. 52, Ankara.
• KLEIN, C. (1964): Cummingtonite-grunerite series: a chemical, optical and X-ray study. Am. Mineral., vol. 49, 963-982.
• M.T.A. INSTITUTE (1966): Chromite deposits of Turkey. M.T.A. Publ., no. 132, Ankara.
• NORIN, R. (1940): Notes on a chrome amphibolite from Turkey. Geol.F6rd.Fdrh. Stockholm, vol. 62, p. 98.
• PAPIKE, J. J.; ROSS, M. & CLARK, J.R. (1969): Crystal-chemical characterization of clinoamphiboles based on five new structure refinements. Mineral. Soc. Amer. Spec. Pap. 2, 117-136.
• RAYCHAUDHI, B. (1964): Relation of atomic constitution to lattice parameters in some hornblendes from the Black Hills, South Dakota. Am. Mineral., vol. 49, p. 198.
• SCHUMACHER, F. (1957): Maden yatakları bilgisinin esasları. İ.T.Ü., Maden Fakültesi, Istanbul.
• WIJKERSLOOTH, p. de (1946): Die Metamorphose des anatolischen Chromerzes und ihre Abhangigkeit von den magmatischen Ereignissen. M.T.A. Publ, no. B. 10, Ankara.
• WITTELS, M. (1951): Structural transformations in amphiboles at elevated temperatures. Am. Mineral., v. 36, p. 851.
• (1952): Structural disintegration of some amphiboles. Am. Mineral., vol. 37, p. 28.