Unilateral Magma Emplacement of the Telimbela Batholith in the Central Ecuadorian Arc: Implications for Kinematics of Oblique Subduction of the Farallon-Nazca Plate
文献类型：期刊论文
| 作者 | Liu, Hongsheng3,4; Liu, Liangming3,4; Zhang, Dexian3,4; Huang, Fangfang2; Zhang, Xin1 |
| 刊名 | TECTONICS
 |
| 出版日期 | 2023 |
| 卷号 | 42期号:2页码:e2021TC007114 |
| 关键词 | SHEAR ZONES VORTICITY ANALYSIS NORTHERN ANDES GRANITE PLUTON FORE-ARC EVOLUTION EXAMPLE ROCKS RATES CONVERGENCE |
| ISSN号 | 0278-7407 |
| DOI | 10.1029/2021TC007114 |
| 英文摘要 | The N-S elongated granodioritic Telimbela batholith (TB, ?220?km2) was emplaced at the restraining bend of the dextral strike-slip Calacalí-Pujilí-Pallatanga Fault (CPPF) developed at the ca. 120?km wide Tertiary Ecuadorian arc. Our and previous zircon U-Pb ages indicate that the batholith has a westward younging trend, with the oldest and youngest ages of 25.5?±?0.5 and 17.5?±?0.3?Ma, respectively, and a minimum duration of 8?±?0.6?Ma was acquired. The Al-in-hornblende geobarometer results show that the TB was emplaced in the upper crust (?4.7–5.3?km). The anisotropy of magnetic susceptibility (AMS) results of TB show three distinct groups of magnetic foliations, with a mean orientation of (64°/SE ∠ 39°) (0°/E ∠ 83°), and (16°/NW ∠ 83°) in the eastern, central and western parts of TB, respectively. As the TB was syntectonically emplaced with the evolution of CPPF, the vorticity numbers (Wn) of eastern, central, and western parts are determined by the angle between CPPF and mean orientation of AMS with Wn values of 0.79, 0, and 0.53, respectively. According to previous geodynamic studies on Northern Andes, the early and late kinematic transitions recorded in the TB may correspond to the change of plate subduction direction and the decrease in subduction angle, respectively. Comparing the estimated growth rate of TB to the tempo of Tertiary Ecuadorian arc magmatism revealed by detrital zircon ages and previous plate convergence velocity models, the good consistency among them will help to restore a detailed kinematic evolution of the Ecuadorian arc. ? 2023. American Geophysical Union. All Rights Reserved. |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000936201400001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/80242]  |
| 专题 | 中国科学院广州地球化学研究所 |
| 作者单位 | 1.Shandong Energy Group South America Ltd., Qingdao, China 2.Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China 3.School of Geosciences and Info-Physics, Central South University, Changsha, China 4.Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha, China |
| 推荐引用方式 GB/T 7714 | Liu, Hongsheng,Liu, Liangming,Zhang, Dexian,et al. Unilateral Magma Emplacement of the Telimbela Batholith in the Central Ecuadorian Arc: Implications for Kinematics of Oblique Subduction of the Farallon-Nazca Plate[J]. TECTONICS,2023,42(2):e2021TC007114. |
| APA | Liu, Hongsheng,Liu, Liangming,Zhang, Dexian,Huang, Fangfang,&Zhang, Xin.(2023).Unilateral Magma Emplacement of the Telimbela Batholith in the Central Ecuadorian Arc: Implications for Kinematics of Oblique Subduction of the Farallon-Nazca Plate.TECTONICS,42(2),e2021TC007114. |
| MLA | Liu, Hongsheng,et al."Unilateral Magma Emplacement of the Telimbela Batholith in the Central Ecuadorian Arc: Implications for Kinematics of Oblique Subduction of the Farallon-Nazca Plate".TECTONICS 42.2(2023):e2021TC007114. |
入库方式： OAI收割
来源：广州地球化学研究所
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