Mineralogical and Petrological Characteristics of the Neoproterozoic Orthoamphibolite and Orthogneisses in the Mutki Area, the Bitlis Massif, Southeast Turkey

Küçük Resim

Tarih

2010

Dergi Başlığı

Dergi ISSN

Cilt Başlığı

Yayıncı

WILEY

Erişim Hakkı

info:eu-repo/semantics/openAccess

Özet

The rocks form as amphibolite +/- garnet +/- epidote and orthogneisses in the Pan-African basement of the Bitlis Massif. The petrochemical data of the studied metamorphic rocks suggest different igneous protoliths ranging from calcalkaline basalt to andesite in composition. Petrochemically, the rocks can be classified as group 1 (low Zr and La) and group 2 (high Zr and La), all showing various enrichments in large ion lithophiles and light rare earth elements, and a depletion in high-field strength elements, suggestive of a destructive plate margin setting. The protoliths of the all samples might have formed mostly by the partial melting of an enriched source, possibly coupled with the fractional crystallization of plagioclase, apatite, and titaniferous magnetite +/- olivine +/- clinopyroxene +/- amphibole in relation with subduction-related magmatism neighboring the Andean-type active margins of Gondwana. The group 2 samples could, however, be generated by a relatively lower degree of the partial melting of an inhomogeneous source with a preponderance of a high-level, fractional crystallization process in comparison to group 1. The protoliths of the samples were metamorphosed up to amphibolite facies conditions, which destroys original igneous texture and mineral assemblages. Geothermobarometric calculations show that the metamorphic rocks are finally equilibrated between 540 and 610 degrees C and similar to 5 kbars, following a clockwise P-T-t path.

Açıklama

Anahtar Kelimeler

amphibolite, petrochemistry, metamorphism, Bitlis Massif, Gondwana, Turkey

Kaynak

Acta Geologica Sinica-English Edition

WoS Q Değeri

Q2

Scopus Q Değeri

Cilt

84

Sayı

3

Künye

Koçak, K., Ceran, F. M., (2010). Mineralogical and Petrological Characteristics of the Neoproterozoic Orthoamphibolite and Orthogneisses in the Mutki Area, the Bitlis Massif, Southeast Turkey. Acta Geologica Sinica-English Edition, 84(3), 563-580. doi: org/10.1111/j.1755-6724.2010.00189.x.