GEOCHEMICAL CHARACTERIZATION OF BASALTS FROM WEST OF KHASH (SE IRAN): AN APPROACH TO THE NATURE OF THE MANTLE SOURCE

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FIROUZKOUHI ZAHRA; AHMADI ALI; MOINEVAZIRI HOSSIEN; MORIDI FARIMANI ALI ASGHAR; RICHARD LENTZ DAVID

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Journal: PETROLOGY Year:2017 | Volume:8 | Issue:30 Page(s): 99-118

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Title

GEOCHEMICAL CHARACTERIZATION OF BASALTS FROM WEST OF KHASH (SE IRAN): AN APPROACH TO THE NATURE OF THE MANTLE SOURCE

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Keywords

ACTIVE CONTINENTAL MARGINSQ1

BASALTQ2

SEDIMENT SUBDUCTIONQ2

ENRICHED MANTLEQ1

MAKRANQ1

Abstract

Monogenic BASALTic cinder cones and lava flows from west of Khash are part of volcanic arc of northern MAKRAN, formed as a result of subduction of Oman oceanic lithosphere beneath the Eurasian plate. The BASALTs belong to medium-K calc-alkaline series as they contain high Al2O3 (16.5- 19.04 wt. %) and CaO (8.4- 12.0 wt. %) and moderate amounts of K2O (0.5- 1.1 wt. %). They share arc geochemical features such as high LILE/HFSE ([Rb/Zr]N-MORB up to 19) LILE/LREE ([Ba/La] N-MORB up to 4.86) and LREE/HREE ([La/Yb]N-MORB up to 10), and depletion of Ta, Nb, Zr, and Ti relative to N-MORB. Partial melting models indicate that near-primary BASALTs were derived from an enriched source type mantle wedge peridotite after low to medium degrees (2-10%) of partial melting. This source peridotite was enriched in LREE and LILE, by subduction derived fluids in the supra-subduction zone. Negative correlation of Th/La vs. Sm/La, and relationships between Pb/Ce and Th/Nb values of the studied BASALTs which are between two end compositions of global subducting sediment (GLOSS) and N-MORB are indicative of significant contribution of subducting sediments to the genesis of the BASALTic rocks. Estimates made using binary mixing model are indicative of about 16% of sediment participation in the magma genesis. Low Pb/Ce ratio (1.6 -11.1), compared to OIB (>20) may be a signature of participation of fluids resulted from dehydration of the subducting slab.

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APA: Copy

FIROUZKOUHI, ZAHRA, AHMADI, ALI, MOINEVAZIRI, HOSSIEN, MORIDI FARIMANI, ALI ASGHAR, & RICHARD LENTZ, DAVID. (2017). GEOCHEMICAL CHARACTERIZATION OF BASALTS FROM WEST OF KHASH (SE IRAN): AN APPROACH TO THE NATURE OF THE MANTLE SOURCE. PETROLOGY, 8(30 ), 99-118. SID. https://sid.ir/paper/197032/en

Vancouver: Copy

FIROUZKOUHI ZAHRA, AHMADI ALI, MOINEVAZIRI HOSSIEN, MORIDI FARIMANI ALI ASGHAR, RICHARD LENTZ DAVID. GEOCHEMICAL CHARACTERIZATION OF BASALTS FROM WEST OF KHASH (SE IRAN): AN APPROACH TO THE NATURE OF THE MANTLE SOURCE. PETROLOGY[Internet]. 2017;8(30 ):99-118. Available from: https://sid.ir/paper/197032/en

IEEE: Copy

ZAHRA FIROUZKOUHI, ALI AHMADI, HOSSIEN MOINEVAZIRI, ALI ASGHAR MORIDI FARIMANI, and DAVID RICHARD LENTZ, “GEOCHEMICAL CHARACTERIZATION OF BASALTS FROM WEST OF KHASH (SE IRAN): AN APPROACH TO THE NATURE OF THE MANTLE SOURCE,” PETROLOGY, vol. 8, no. 30 , pp. 99–118, 2017, [Online]. Available: https://sid.ir/paper/197032/en

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