Late Cenozoic volcanism in the Almaludag region, Azerbaijan province, northwest Iran: Evidence for post-collisional extension
文献类型：期刊论文
| 作者 | Jafari, Morteza Khalatbari6; Siavashani, Nafiseh Salehi5; Babaie, Hassan A.4; Xiao, Wenjiao2,3; Faridi, Mohammad1; Ao, Songjian3 |
| 刊名 | JOURNAL OF GEODYNAMICS
 |
| 出版日期 | 2020-12-01 |
| 卷号 | 141页码:26 |
| 关键词 | Post-collision extension Adakite Trachydacite Cinder Basalt Shoshonite Northwest Iran |
| ISSN号 | 0264-3707 |
| DOI | 10.1016/j.jog.2020.101779 |
| 英文摘要 | We discuss the geology, petrology, and major and trace element geochemistry of Late Cenozoic volcanic rocks in the Almaludag region in the Western Azerbaijan province, northwest Iran. Geology of this region evolved through the northward subduction of the Neotethyan oceanic lithosphere and subsequent collision of the Arabian and Eurasian plates during the Alpine-Himalayan orogeny. Two different Late Cenozoic periods of volcanic activity are recognized: Episode I produced pyroclastic deposits and trachydacitic lava (1.47 Ma, U-Pb dating) and Episode II generated mafic lava and scoria cones (including spatter/cinder). Geochemical data indicate that Episode I lavas have high-silica adakitic compositions, similar to the post-collisional and continental adakites, that formed from the partial melting of the thickened lower crust. Episode II lavas vary in composition and fall into two distinct geochemical groups. The first group includes picrobasalt-basanite and tephrite compared to the more evolved trachybasalt and basaltic trachyandesite of the second group. Both of these groups show alkaline to shoshonitic affinities. The binary geochemical plots of the Episode II samples display compositional trends that indicate magmatic processes such as fractional olivine clinopyroxene crystallization. The major and minor elemental variations of these samples reflect a mantle source heterogeneity and minor crustal contamination. The REE (rare earth elements) patterns and spider diagrams indicate enrichment of the large ion lithophile elements (LILE) and depletion of the high field strength elements (HFSE) relative to the heavy rare earth elements (HREE), and reveal an enriched lithospheric mantle source which was previously metasomatized by subduction components. The mantle source of the Episode II lavas was enriched by fluids and melts which were released from a subducted slab between Late Mesozoic and Early Cenozoic in northwest Iran. The Si-undersaturated lavas of the first group of Episode II probably originated in the garnet stability field in the lithospheric mantle with carbonate residue or veins, suggesting that the mantle source probably underwent carbonate metasomatism. Geochemistry of the SiO2 rich lavas of the second group of Episode II is consistent with a melt extracted from a peridotitic mantle source. The compositional variation from the rocks of the first group to those in the second group suggests a diminishing degree of metasomatic veins-wallrock interactions. The Late Cenozoic mafic rocks in the Almaludag region probably formed through extension in a post-collision, post-orogenic setting. The extension was likely the result of the delamination of the thickened subcontinental lithospheric mantle (SCLM) and ensuing asthenospheric upwelling after the collision of the Arabian and Eurasian plates. |
| WOS关键词 | MAIN RECENT FAULT ; QUATERNARY VOLCANISM ; TRACE-ELEMENT ; NW IRAN ; INTRAPLATE VOLCANISM ; LITHOSPHERIC MANTLE ; TECTONIC EVOLUTION ; EASTERN PONTIDES ; CENTRAL ANATOLIA ; ARABIAN PLATE |
| 资助项目 | National Natural Science Foundation of China[41822204] ; National Natural Science Foundation of China[41888101] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000596152500001 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 资助机构 | National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/99917]  |
| 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 | Jafari, Morteza Khalatbari |
| 作者单位 | 1.Geol Survey Iran, Northwestern Reg Off Tabriz, Tabriz, Iran 2.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 4.Georgia State Univ, Dept Geosci, Atlanta, GA USA 5.Tech Univ Catalonia, Dept Civil & Environm Engn, Barcelona, Spain 6.Geol Survey Iran, Res Inst Earth Sci, Azadi Sq,Meraj Ave, Tehran 131851494, Iran |
| 推荐引用方式 GB/T 7714 | Jafari, Morteza Khalatbari,Siavashani, Nafiseh Salehi,Babaie, Hassan A.,et al. Late Cenozoic volcanism in the Almaludag region, Azerbaijan province, northwest Iran: Evidence for post-collisional extension[J]. JOURNAL OF GEODYNAMICS,2020,141:26. |
| APA | Jafari, Morteza Khalatbari,Siavashani, Nafiseh Salehi,Babaie, Hassan A.,Xiao, Wenjiao,Faridi, Mohammad,&Ao, Songjian.(2020).Late Cenozoic volcanism in the Almaludag region, Azerbaijan province, northwest Iran: Evidence for post-collisional extension.JOURNAL OF GEODYNAMICS,141,26. |
| MLA | Jafari, Morteza Khalatbari,et al."Late Cenozoic volcanism in the Almaludag region, Azerbaijan province, northwest Iran: Evidence for post-collisional extension".JOURNAL OF GEODYNAMICS 141(2020):26. |
入库方式： OAI收割
来源：地质与地球物理研究所
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