Neotethyan Subduction Ignited the Iran Arc and Backarc Differently
文献类型：期刊论文
| 作者 | Moghadam, H. Shafaii1,2,3,4; Li, Q. L.2; Li, X. H.2; Stern, R. J.5; Levresse, G.6; Santos, J. F.7; Lopez Martinez, M.8; Ducea, M. N.9,10; Ghorbani, G.3; Hassannezhad, A.3 |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
 |
| 出版日期 | 2020-05-01 |
| 卷号 | 125期号:5页码:30 |
| ISSN号 | 2169-9313 |
| DOI | 10.1029/2019JB018460 |
| 英文摘要 | Most arcs show systematic temporal and spatial variations in magmatism with clear shifts in igneous rock compositions between those of the magmatic front (MF) and those in the backarc (BA). It is unclear if similar magmatic polarity is seen for extensional continental arcs. Herein, we use geochemical and isotopic characteristics coupled with zircon U-Pb geochronology to identify the different magmatic style of the Iran convergent margin, an extensional system that evolved over 100 Myr. Our new and compiled U-Pb ages indicate that major magmatic episodes for the NE Iran BA occurred at 110-80, 75-50, 50-35, 35-20, and 15-10 Ma. In contrast to NE Iran BA magmatic episodes, compiled data from MF display two main magmatic episodes at 95-75 and 55-5 Ma, indicating more continuous magmatism for the MF than for the BA. We show that Paleogene Iran serves as a useful example of a continental arc under extension. Our data also suggest that there is not a clear relationship between the subduction velocity of Neotethyan Ocean beneath Iran and magmatic activity in Iran. Our results imply that the isotopic compositions of Iran BA igneous rocks do not directly correspond to the changes in tectonic processes or geodynamics, but other parameters such as the composition of lithosphere and melt source(s) should be considered. In addition, changes in subduction zone dynamics and contractional versus extensional tectonic regimes influenced the composition of MF and BA magmatic rocks. These controls diminished the geochemical and isotopic variations between the magmatic front and backarc. Plain Language Summary Most arcs show systematic temporal and spatial variations in magmatism with a clear shift in the composition of igneous products between those of the magmatic front and those in the backarc (BA). Our U-Pb ages for the NE Iran BA identify five magmatic episodes for the NE Iran backarc, which occurred at 110-80 million years ago (Ma), 75-50, 50-35, 35-20, and 15-10 Ma. The 110-80 Ma magmatic episode was a time of strong regional extension due to subduction initiation along the Zagros suture zone, while the younger episodes reflect maturation of the magmatic arc. The first magmatic episode is represented by magmas dominated by inputs from the underlying mantle, as does the next episode (75-50 Ma). The third pulse (50-35 Ma) shows increasing contributions from the underlying crust. The fourth magmatic pulse occurred at 35-20 Ma, and the volume of these magmas was less than other magmatic pulses. The final pulse in the NE Iran BA (15-10 Ma) suggests that there was a change in magmatic architecture beneath the BA. Magmatic pulses at 110-80 and 50-35 Ma accompanied extension, while others accompanied compression due to collision with Arabia. Contribution of continental crust components was highest for the 50-35 Ma magmatic episode. |
| WOS关键词 | SANANDAJ-SIRJAN ZONE ; ZIRCON U-PB ; LITHOSPHERIC STRUCTURE BENEATH ; NATURAL REFERENCE MATERIAL ; DOKHTAR MAGMATIC BELT ; LUT-SISTAN REGION ; TECTONIC EVOLUTION ; PLUTONIC COMPLEX ; VOLCANIC-ROCKS ; FLARE-UP |
| 资助项目 | National Key Research and Development Program of China[2016YFE0203000] ; Chinese Academy of Sciences, President's International Fellowship Initiative (PIFI)[2019VCB0013] ; U.S. National Science Foundation[EAR 1725002] ; Romanian Executive Agency for Higher Education, Research, Development and Innovation Funding Projects[PN-III-P4-ID-PCE-2016-0127] ; Romanian Executive Agency for Higher Education, Research, Development and Innovation Funding Projects[PN-III-P4-ID-PCCF-2016-0014] ; Foundation for Science and Technology of Portugal[UID/GEO/04035/2019] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000562379800009 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 资助机构 | National Key Research and Development Program of China ; National Key Research and Development Program of China ; Chinese Academy of Sciences, President's International Fellowship Initiative (PIFI) ; Chinese Academy of Sciences, President's International Fellowship Initiative (PIFI) ; U.S. National Science Foundation ; U.S. National Science Foundation ; Romanian Executive Agency for Higher Education, Research, Development and Innovation Funding Projects ; Romanian Executive Agency for Higher Education, Research, Development and Innovation Funding Projects ; Foundation for Science and Technology of Portugal ; Foundation for Science and Technology of Portugal ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Chinese Academy of Sciences, President's International Fellowship Initiative (PIFI) ; Chinese Academy of Sciences, President's International Fellowship Initiative (PIFI) ; U.S. National Science Foundation ; U.S. National Science Foundation ; Romanian Executive Agency for Higher Education, Research, Development and Innovation Funding Projects ; Romanian Executive Agency for Higher Education, Research, Development and Innovation Funding Projects ; Foundation for Science and Technology of Portugal ; Foundation for Science and Technology of Portugal ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Chinese Academy of Sciences, President's International Fellowship Initiative (PIFI) ; Chinese Academy of Sciences, President's International Fellowship Initiative (PIFI) ; U.S. National Science Foundation ; U.S. National Science Foundation ; Romanian Executive Agency for Higher Education, Research, Development and Innovation Funding Projects ; Romanian Executive Agency for Higher Education, Research, Development and Innovation Funding Projects ; Foundation for Science and Technology of Portugal ; Foundation for Science and Technology of Portugal ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Chinese Academy of Sciences, President's International Fellowship Initiative (PIFI) ; Chinese Academy of Sciences, President's International Fellowship Initiative (PIFI) ; U.S. National Science Foundation ; U.S. National Science Foundation ; Romanian Executive Agency for Higher Education, Research, Development and Innovation Funding Projects ; Romanian Executive Agency for Higher Education, Research, Development and Innovation Funding Projects ; Foundation for Science and Technology of Portugal ; Foundation for Science and Technology of Portugal |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/97667]  |
| 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 | Moghadam, H. Shafaii; Li, Q. L. |
| 作者单位 | 1.Macquarie Univ, CCFS & GEMOC ARC Natl Key Ctr, Sydney, NSW, Australia 2.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, Beijing, Peoples R China 3.Damghan Univ, Sch Earth Sci, Damghan, Iran 4.Helmholtz Zentrum Ozeanforsch Kiel, GEOMAR, Kiel, Germany 5.Univ Texas Dallas, Geosci Dept, Richardson, TX 75083 USA 6.Univ Nacl Autonoma Mexico, Ctr Geosci, Mexico City, DF, Mexico 7.Univ Aveiro, Dept Geociencias, Geobiotec, Aveiro, Portugal 8.Ctr Invest Cient & Educ Super Ensenada CICESE, Dept Geol, Ensenada, Baja California, Mexico 9.Univ Arizona, Tucson, AZ USA 10.Univ Bucharest, Fac Geol & Geophys, Bucharest, Romania |
| 推荐引用方式 GB/T 7714 | Moghadam, H. Shafaii,Li, Q. L.,Li, X. H.,et al. Neotethyan Subduction Ignited the Iran Arc and Backarc Differently[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2020,125(5):30. |
| APA | Moghadam, H. Shafaii.,Li, Q. L..,Li, X. H..,Stern, R. J..,Levresse, G..,...&Hassannezhad, A..(2020).Neotethyan Subduction Ignited the Iran Arc and Backarc Differently.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,125(5),30. |
| MLA | Moghadam, H. Shafaii,et al."Neotethyan Subduction Ignited the Iran Arc and Backarc Differently".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 125.5(2020):30. |
入库方式： OAI收割
来源：地质与地球物理研究所
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