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Paper Information

Journal:   PETROLOGY   SUMMER 2017 , Volume 8 , Number 30 ; Page(s) 99 To 118.
 
Paper: 

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

 
 
Author(s):  FIROUZKOUHI ZAHRA, AHMADI ALI*, MOINEVAZIRI HOSSIEN, MORIDI FARIMANI ALI ASGHAR, RICHARD LENTZ DAVID
 
* DEPARTMENT OF GEOLOGY, UNIVERSITY OF SISTAN AND BALUCHESTAN, ZAHEDAN, IRAN
 
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.

 
Keyword(s): ACTIVE CONTINENTAL MARGINS, BASALT, SEDIMENT SUBDUCTION, ENRICHED MANTLE, MAKRAN
 
 
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APA: Copy

FIROUZKOUHI, Z., & AHMADI, A., & MOINEVAZIRI, H., & MORIDI FARIMANI, A., & RICHARD LENTZ, D. (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. https://www.sid.ir/en/journal/ViewPaper.aspx?id=570277



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. 2017 [cited 2021May16];8(30 ):99-118. Available from: https://www.sid.ir/en/journal/ViewPaper.aspx?id=570277



IEEE: Copy

FIROUZKOUHI, Z., AHMADI, A., MOINEVAZIRI, H., MORIDI FARIMANI, A., RICHARD LENTZ, D., 2017. GEOCHEMICAL CHARACTERIZATION OF BASALTS FROM WEST OF KHASH (SE IRAN): AN APPROACH TO THE NATURE OF THE MANTLE SOURCE. PETROLOGY, [online] 8(30 ), pp.99-118. Available: https://www.sid.ir/en/journal/ViewPaper.aspx?id=570277.



 
 
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