Volume 9, Issue 2 (Autumn & Winter 2024)
KJES 2024, 9(2): 47-76 |
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Besharati P, Kananian A, Sepidbar F. Pyroxene chemistry of xenoliths related to volcanic rocks in the Eslamieh Peninsula (Saray volcano): Implications for geothermobarometry and tectonic setting. KJES 2024; 9 (2) :47-76
URL: http://gnf.khu.ac.ir/article-1-2796-en.html
URL: http://gnf.khu.ac.ir/article-1-2796-en.html
1- University of Tehran
2- University of Tehran ,kananian@ut.ac.ir
3- University of Ferdowsi, Mashad
2- University of Tehran ,
3- University of Ferdowsi, Mashad
Abstract: (1664 Views)
The high K-volcanic rocks of the Eslamieh Peninsula (Saray) are exposed in the northwestern Urumieh-Dokhtar magmatic belt. They mainly include phonolitic lavas and related xenoliths. The xenoliths can be subdivided into two types with basaltic and trachyandesitic compositions. The phonolites and related xenoliths are characterized by enrichment in large ion lithophile elements (LILEs: Th, Ba, Rb and K) and light rare earth elements (LREE), depletion in high field strength elements (HFSE: Eu, Ta, Nb and Ti) and flat patterns in heavy rare earth elements (HREE). They have typical high–K and shoshonitic signatures formed in post-collisional arc setting. The studied pyroxenes from phonolitic hosts were crystallized at moderate to high pressures (6-15 kbar) and temperatures of 1200-1300 ̊C, whereas those from trachyandesite and basaltic xenoliths were formed at lower pressures (6-10 kbar and 2-5 kbar) and temperatures (1150-1200 ̊C and 1100-1150 ̊C), respectively. Due to the lack of evidence for melting, dissolution and the presence of accumulated microcrystals at the mineral boundary, it seems that the xenoliths were detached from the walls and been transported to the surface during magma ascent
Keywords: High-k calc-alkaline, xenolith, chemistry of pyroxene, post-collision, Eslamieh Peninsula.
Type of Study: Original Research |
Subject:
Petrology
Received: 2021/12/29 | Accepted: 2023/02/26 | Published: 2024/01/10
Received: 2021/12/29 | Accepted: 2023/02/26 | Published: 2024/01/10
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