Document Type : Original Research Paper
Authors
1 Assistant Professor, Department of Geology, Payam Noor University, Iran
2 Professor, Department of Geology, Faculty of Sciences, Shahid Bahonr University of Kerman, Kerman, Iran
Abstract
Neogene volcanism in the Tel Gorban-Chah Breshk area, north of Shahre-Babak, occurs as dacitic to andesitic lava flows and domes. Petrographically the rocks consist of plagioclase, hornblende ±biotite and quartz phenocrysts setting in porphyritic and hyalopilitic matrix. Opacitization of hornblende and biotite and zoning and sieve texture in plagioclase are signatures of disequilibrium conditions through the magma cooling. Geochemical data and petrological diagrams show their medium potassic calc- alkaline nature. Enrichment in LILE’s and depletion in HFSE’s (eg. Nb,Ta,Ti) points to a subduction tectonic environment for Tel Gorban-Chah Breshk dacitic to andesitic rocks. Furthermore, their Al2O3>16,Sr/Y>80 and chondrite normalize REE pattern are quite similar to dakites. Distinctive geochemical features such as Rb/Sr< 0.04, La/Yb> 18, Yb< 1, (Sr/Y)n> 80, and Y
Keywords
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