Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

Application of Sm/Eu/, Rb/Sr, Ce/Yb and F-Rb ratios to discriminate between Tin mineralized and non - mineralized S-type granites

Author
Department of Geology, Faculty of Science, Ferdowsi University, Mashhad, Iran
Abstract
Mashhad Granites and Granodiorites are divided into three groups based on their ages and composition:(1) Dehnow- Vakilabad-Kuhsangi Granodiorites and Quartz monzodiorites, (2) Sangbast Granite and (3) Khalaj- Gheshlagh Biotite- muscovite Granite. All these intrusives belong to S-type granite, The oldest are in the range of intermediate and the youngest are acidic in composition. Intrusive rocks in the area of Dehnow to Kuhsangi show trend of differentiation.
Major, trace and rare earth elements within the source rocks of porphyry Sn, Mo, and Cu deposits were compared and very distinct differences were noticed. Differentiation index, Rb/Sr, Ce/Yb, and (Sr86 /Sr87) ratios can be used to identify the source rocks for porphyry Sn, Mo, or Cu.
Major, as well as trace and rare earth elements of Mashhad Granites and Granodiorites were compared with tin mineralized granites of the world. As a result, four diagrams were presented to be utilized in order to discriminate between Sn mineralized and non-mineralized granites. Such as Rb to the ratio of Sm/Eu, F to Rb and the three angle of F, Rb, Sr + Ba.
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Volume 8, 29-30
Autumn & Winter 1999, vol. 8, No. 29-30
Winter 1999
Pages 2-15