Journal Paper

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Journal: پترولوژی
Year:1396 | Volume:8 | Issue:32
Start Page:87 | End Page:104

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Title

GEOCHRONOLOGY AND LU-HF ISOTOPE OF MAFIC-INTERMEDIATE ROCKS FROM SW SALMAS: IMPLICATION FOR NEOPROTEROZOIC JUVENILE MELTS

Pages

 Start Page 87 | End Page 104

Abstract

 The southwest SALMAS metamorphosed mafic-intermediate intrusive rocks are located in SANANDAJ-SIRJAN ZONE in NW of Iran. The metamorphosed intrusives rocks comprisemetagabbro and metadiorite that intruded the Precambrian metamorphosed volcanicsedimentary rocks. U-Pb zircon dating of two samples of metagabbro rocks yielded age of Ca. 548.7±2.5 Ma to 553.1±7.0 Ma and one sample of metadiorite rock yielded age of 542±6.5 Ma (late Neoproterozoic-Cambrian). Based on the obtained geochemical results, these rocks were crystallized from subduction-related melts.The ef (t) values of these rocks are variable from+6.2 to+14.16. HF MODEL AGEs of mafic-intermediate rocks from the SW SALMAS show values of 593-1000 Ma (Neoproterozoic). U-Pb zircon dating and Hf isotope results indicate that late Neoproterozoic-Cambrian metamorphosed mafic-intermediate intrusive rocks in the northwest of Iran were related to widespread magmatism (Cadomian magmatism) along the northern margin of GONDWANA.

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