Middle-Late Miocene to Pleistocene post-collisional magmatism in the Arabia-Eurasia collision zone, an example from northwest Iran

IF 3.5 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Journal of Petrology Pub Date : 2023-11-07 DOI:10.1093/petrology/egad081
Hadi Shafaii Moghadam, Kaj A Hoernle, Folkmar Hauff, Massimo Chiaradia, Dieter Garbe-Schönberg, Teresa Orozco-Esquivel, Ilya N Bindeman, Orhan Karsli, Ghasem Ghorbani, Naeim Mousavi, Federico Lucci
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Abstract

Abstract Post-collisional volcanism contains important clues for understanding the processes that prevail in orogenic belts, including those in the mantle and the uplift and collapse of continents. Here we report new geochronological and geochemical data for a suite of post-collisional Miocene to Pleistocene volcanic rocks from northwest Iran. Four groups of volcanic rocks can be distinguished according to their geochemical and isotopic signatures, including: (1) Miocene depleted lavas with high Nd and Hf but low Pb and Sr isotopic ratios, (2) less depleted lavas with quite variable Pb isotopic composition, (3) lavas with non-radiogenic Nd and Hf isotopic values, but highly radiogenic Sr and Pb isotopic composition, and (4) Pleistocene adakitic rocks with depleted isotopic signatures. The isotopic data reveal that the Miocene rocks are derived from asthenospheric and highly heterogeneous sub-continental lithospheric mantle sources. Evidence suggests that the lithospheric mantle contains recycled upper continental material and is isotopically similar to the enriched mantle two (EMII) endmember. Analysis of Sr-Nd-Pb-Hf-O isotopes in both mineral and rock groundmass, in conjunction with energy-constrained assimilation and fractional crystallization (EC-AFC) numerical modeling, demonstrates that the incorporation of continental crust during magma fractionation via AFC had an insignificant impact on the isotopic composition of the Miocene lavas. Moreover, adakites are the youngest rocks and show a geochemical signature consistent with the partial melting of a young and mafic continental lower crust. Both seismological data and geochemical signatures on these Miocene to Pleistocene volcanic rocks indicate the initiation of asthenospheric upwelling and orogen uplift in the Arabia-Eurasia collision zone, which occurred after slab break-off, following the Neotethyan closure.
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阿拉伯-欧亚碰撞带中晚中新世至更新世碰撞后岩浆活动,以伊朗西北部为例
碰撞后火山作用为理解造山带的过程提供了重要的线索,包括地幔和大陆的隆升和崩塌过程。在这里,我们报告了伊朗西北部一套碰撞后中新世至更新世火山岩的新的年代学和地球化学数据。根据其地球化学特征和同位素特征,可划分出四组火山岩:(1)高Nd、Hf、低Pb、Sr同位素比值的中新世贫火山岩;(2)低Pb同位素组成变化较大的贫火山岩;(3)无放射性Nd、Hf同位素值、高放射性Sr、Pb同位素组成的火山岩;(4)贫同位素特征的更新世阿达基岩。同位素资料显示中新世岩石来源于软流圈和高度不均匀的次大陆岩石圈地幔。有证据表明,岩石圈地幔含有再循环的上大陆物质,其同位素特征与富集地幔二(EMII)端元相似。矿物和岩石中Sr-Nd-Pb-Hf-O同位素分析,结合能量约束同化和分数结晶(EC-AFC)数值模拟表明,大陆地壳在AFC岩浆分选过程中的结合对中新世熔岩的同位素组成影响不显著。此外,埃达克岩是最年轻的岩石,其地球化学特征与年轻的基性大陆下地壳的部分熔融一致。这些中新世至更新世火山岩的地震资料和地球化学特征表明,在新特提斯闭合后的板块断裂之后,阿拉伯-欧亚碰撞带开始了软流圈上升流和造山带隆升。
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来源期刊
Journal of Petrology
Journal of Petrology 地学-地球化学与地球物理
CiteScore
6.90
自引率
12.80%
发文量
117
审稿时长
12 months
期刊介绍: The Journal of Petrology provides an international forum for the publication of high quality research in the broad field of igneous and metamorphic petrology and petrogenesis. Papers published cover a vast range of topics in areas such as major element, trace element and isotope geochemistry and geochronology applied to petrogenesis; experimental petrology; processes of magma generation, differentiation and emplacement; quantitative studies of rock-forming minerals and their paragenesis; regional studies of igneous and meta morphic rocks which contribute to the solution of fundamental petrological problems; theoretical modelling of petrogenetic processes.
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