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Lithospheric mantle, asthenosphere, slab and crustal contribution to petrogenesis of Eocene to Miocene volcanic rocks from the west Alborz Magmatic Assemblage, SE Ahar, Iran

文献类型：期刊论文

作者Ahmadvand, Ahmad2; Ghorbani, Mohammad Reza2; Mokhtari, Mir Ali Asghar3; Chen, Yi4; Amidon, William5; Santos, Jose Francisco1; Paydari, Mohammad2
刊名GEOLOGICAL MAGAZINE
出版日期2021-03-01
卷号158期号:3页码:375-406
关键词west Alborz Magmatic Assemblage subalkali basalts– andesites high-Nb basalts A-type rocks mantle
ISSN号0016-7568
DOI10.1017/S0016756820000527
英文摘要Significant uncertainty remains regarding the exact timing and nature of subduction events during the closure of the Tethyan seas in what is now NW Iran. This study thus presents new geochemical compositions and U-Pb ages for a suite of volcanic rocks emplaced during Cenozoic volcanism in the west Alborz Magmatic Assemblage, which is commonly regarded as the back-arc of the Neotethyan magmatism in Central Iran. The subalkali basalts and andesites are dated to 57 +/- 1.2 Ma, and are likely derived from a supra-subduction mantle wedge. Later, trachytic A-type rocks erupted from similar to 42 to 25 Ma during an anorogenic (extensional) stage triggered by slab retreat and associated asthenospheric mantle influx. A-type melts were at least partly concurrent with lithospheric mantle magmatism implied by eruption of subalkali basalts-andesites around 26-24 Ma. Next, Amp-Bt trachybasaltic volcanism with high-Nb basaltic affinity at similar to 19 Ma likely records slab deepening and slab partial melting, which reacted with the mantle wedge to produce the source material for the high-Nb basalts. Sr-Nd isotopic ratios for SE Ahar mafic as well as A-type rocks imply rather enriched mantle source(s). Some crustal contamination is implied by the presence of inherited zircons dominated by those derived from Neoproterozoic-Cambrian basement rocks and Carboniferous magmatism. Rhyolitic rocks with adakitic affinity probably mark the final volcanism in the study area. The adakitic rocks show crustal signatures such as high K and Th, probably formed as a consequence of higher temperature gradients, at crustal levels, imposed by both slab and mantle partial melts.
WOS关键词A-TYPE GRANITES ; STRENGTH ELEMENT ENRICHMENT ; HIGH-NB BASALT ; URUMIEH-DOKHTAR ARC ; U-PB ZIRCON ; TRACE-ELEMENT ; CONTINENTAL GROWTH ; CALC-ALKALINE ; SULU ARC ; CHEMICAL CLASSIFICATION
资助项目Tarbiat Modares University (TMU) ; National Science Foundation of China[41490614] ; FCT (Portugal)[UID/GEO/04035/2013]
WOS研究方向Geology
语种英语
WOS记录号WOS:000617280900001
出版者CAMBRIDGE UNIV PRESS
资助机构Tarbiat Modares University (TMU) ; Tarbiat Modares University (TMU) ; National Science Foundation of China ; National Science Foundation of China ; FCT (Portugal) ; FCT (Portugal) ; Tarbiat Modares University (TMU) ; Tarbiat Modares University (TMU) ; National Science Foundation of China ; National Science Foundation of China ; FCT (Portugal) ; FCT (Portugal) ; Tarbiat Modares University (TMU) ; Tarbiat Modares University (TMU) ; National Science Foundation of China ; National Science Foundation of China ; FCT (Portugal) ; FCT (Portugal) ; Tarbiat Modares University (TMU) ; Tarbiat Modares University (TMU) ; National Science Foundation of China ; National Science Foundation of China ; FCT (Portugal) ; FCT (Portugal)
源URL[http://ir.iggcas.ac.cn/handle/132A11/100152]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Ghorbani, Mohammad Reza
作者单位1.Univ Aveiro, Dept Geosci, Geobiotec Res Unit, P-3810193 Aveiro, Portugal
2.Tarbiat Modares Univ, Dept Geol, Tehran, Iran
3.Univ Zanjan, Fac Sci, Dept Geol, Zanjan, Iran
4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, POB 9825, Beijing 100029, Peoples R China
5.Middlebury Coll, Geol Dept, Middlebury, VT 05753 USA
推荐引用方式
GB/T 7714		 Ahmadvand, Ahmad,Ghorbani, Mohammad Reza,Mokhtari, Mir Ali Asghar,et al. Lithospheric mantle, asthenosphere, slab and crustal contribution to petrogenesis of Eocene to Miocene volcanic rocks from the west Alborz Magmatic Assemblage, SE Ahar, Iran[J]. GEOLOGICAL MAGAZINE,2021,158(3):375-406.
APA Ahmadvand, Ahmad.,Ghorbani, Mohammad Reza.,Mokhtari, Mir Ali Asghar.,Chen, Yi.,Amidon, William.,...&Paydari, Mohammad.(2021).Lithospheric mantle, asthenosphere, slab and crustal contribution to petrogenesis of Eocene to Miocene volcanic rocks from the west Alborz Magmatic Assemblage, SE Ahar, Iran.GEOLOGICAL MAGAZINE,158(3),375-406.
MLA Ahmadvand, Ahmad,et al."Lithospheric mantle, asthenosphere, slab and crustal contribution to petrogenesis of Eocene to Miocene volcanic rocks from the west Alborz Magmatic Assemblage, SE Ahar, Iran".GEOLOGICAL MAGAZINE 158.3(2021):375-406.

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来源：地质与地球物理研究所

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