Geochemistry, petrogenesis, zircon U Pb geochronology and Sr Nd isotopic composition of Kuh-e-Shah volcanic rocks: Implications for an active continental margin along with eastern Iran during the Paleogene
作者： Abbas Etemadi , Samaneh Nadermezerji , Mohammad Hassan Karimpour , Azadeh Malekzadeh Shafaroudi , José Francisco Santos
DOI: 10.1016/J.LITHOS.2020.105778
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摘要: Abstract The Kuh-e-Shah complex includes the Paleogene volcano-plutonic belt of Lut Block, eastern Iran. volcanic rocks which outcropped in this mainly consist trachy-andesites, andesites, and basaltic-andesites that mineralogically contain plagioclase, pyroxene, hornblende, minor biotite olivine. Geochemically, they have features typical high-K calc-alkaline to shoshsonitic magmas with enrichment large ion lithophile elements (LILE), depletion high field strength (HFSE) heavy rare earth (HREE). Chondrite-normalized REE plots show light (4.9 Pb dating indicates an age 38.6 38.9 Ma for (Middle Eocene, Bartonian). Initial 87Sr/86Sr 143Nd/144Nd ratios (0.704350–0.704820 0.512619–0.512779, resp.), are compatible parental melts formation a subduction mantle wedge. ɛNdi values (+0.60 +3.73) range mantle-derived melts. We suggest Block part volcanism resulted from Sistan oceanic crust under during Cretaceous.
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