The magmatic evolution of the Neotethyan rift: Geochronologic, isotopic, and geochemical evidence from A-type felsic magmatism, NW Iran
文献类型：期刊论文
| 作者 | Nabatian, Ghasem2; Li, Xian-Hua1; Honarmand, Maryam3; Esmaeili, Rasoul2 |
| 刊名 | JOURNAL OF GEODYNAMICS
 |
| 出版日期 | 2021-05-01 |
| 卷号 | 145页码:17 |
| 关键词 | Extensional tectonic setting A-type granite Neotethys Ajabshir Northwest Iran Gondwana |
| ISSN号 | 0264-3707 |
| DOI | 10.1016/j.jog.2021.101829 |
| 英文摘要 | The Ajabshir rhyolitic magma in the northwest (NW) of Iran is an Early Carboniferous (332.5 +/- 2.2 Ma), approximately 50m-thick succession, consisting of quartz, alkali feldspar, and biotite phenocryst with a porphyritic texture. This magmatic unit occurred as lava flows and sills intruded into the early Cambrian Lalun Formation. The Ajabshir magma has a calc-alkaline to high potassic calc-alkaline affinity and peraluminous character and displays many of the classic features of A-type magmas, enrichment in HFSEs (Zr + Nb + Ce + Y = 664-808 ppm), Nb (120-218 ppm), Zr (298-362 ppm), Ga (34-38 ppm), Ce (100-132 ppm), high Ga/Al and FeO*/(FeO*+MgO), zircon saturation temperature, and low contents of CaO, Sr, and Eu. The LREE enrichment, non-depletion in HREE, and negative Eu anomalies in the chondrite normalized diagrams exhibit similarities to the REE patterns of "hot-dry-reduced rhyolites", further pointing to the evolution of Ajabshir rhyolitic magma from an OIB-type parental melt via a fractional crystallization process. The zircon yield epsilon Hf(t) values of +1.4 to +5.5 correspond to two-stage zircon Hf model ages of 0.9-1.2 Ga. The delta 18O values of the zircon range from +5.8%o to +7.37%o. The zircon isotopic data together with whole-rock geochemical signatures suggest that the mantle-derived magma was modified by crustal components during its ascent to the surface. The Ajabshir A-type rhyolitic magma provides more evidence for an extensional tectonic setting during the Early Carboniferous in NW Iran, contemporaneous with the rifting of the Neotethyan Ocean at the northern margin of Gondwana. |
| WOS关键词 | LARGE IGNEOUS PROVINCE ; U-PB ZIRCON ; TECTONIC EVOLUTION ; NORTHERN GONDWANA ; CONTINENTAL-CRUST ; EASTERN PONTIDES ; DEPLETED MANTLE ; VOLCANIC-ROCKS ; TRACE-ELEMENT ; RING COMPLEX |
| 资助项目 | National Key R and D Program of China[2016YFE0203000] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000656667800002 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 资助机构 | National Key R and D Program of China ; National Key R and D Program of China ; National Key R and D Program of China ; National Key R and D Program of China ; National Key R and D Program of China ; National Key R and D Program of China ; National Key R and D Program of China ; National Key R and D Program of China |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/102026]  |
| 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 | Nabatian, Ghasem |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Univ Zanjan, Fac Sci, Dept Geol, Zanjan, Iran 3.Inst Adv Studies Basic Sci IASBS, Dept Earth Sci, Zanjan 4513766731, Iran |
| 推荐引用方式 GB/T 7714 | Nabatian, Ghasem,Li, Xian-Hua,Honarmand, Maryam,et al. The magmatic evolution of the Neotethyan rift: Geochronologic, isotopic, and geochemical evidence from A-type felsic magmatism, NW Iran[J]. JOURNAL OF GEODYNAMICS,2021,145:17. |
| APA | Nabatian, Ghasem,Li, Xian-Hua,Honarmand, Maryam,&Esmaeili, Rasoul.(2021).The magmatic evolution of the Neotethyan rift: Geochronologic, isotopic, and geochemical evidence from A-type felsic magmatism, NW Iran.JOURNAL OF GEODYNAMICS,145,17. |
| MLA | Nabatian, Ghasem,et al."The magmatic evolution of the Neotethyan rift: Geochronologic, isotopic, and geochemical evidence from A-type felsic magmatism, NW Iran".JOURNAL OF GEODYNAMICS 145(2021):17. |
入库方式： OAI收割
来源：地质与地球物理研究所
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