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| DOI | 10.2113/2024/lithosphere_2023_319 |
| Continental Arc Accumulation Mafic Rocks in the Mid-Upper Crust: Constraints From the Early Eocene Hornblende Gabbro-Diorite in the Tengchong Block, Southeastern Extension of Tibet | |
| 发表日期 | 2024 |
| ISSN | 1941-8264 |
| EISSN | 1947-4253 |
| 起始页码 | 2024 |
| 结束页码 | 1 |
| 卷号 | 2024期号:1 |
| 英文摘要 | Magmatic activity in the syn-collision stage is key for net crustal growth. To understand the mechanism of accretion-dif- ferentiation and compositional change of the continental crust, it is important to focus on the magmatic activity during the syn-collision stage. Early Eocene mafic-ultramafic rock assemblages found in the western part of the Tengchong Block resulted from a continuous series of arc magmatic evolution, thoroughly recording the continental arc magmatic system during the subduction of the Neo-Tethys Ocean and syn-collision of the Indian-Asian continents. Early Eocene hornblende gabbro-diorite in the Tengchong Block formed at 53 Ma, and the primitive magma was derived from an enriched mantle source due to the enriched Nd-Hf isotopes. The amphibole and biotite thermobarometer measurements indicate that the mafic magma reservoirs in the Tengchong Block occurred at a mid-upper crust. Petrography, amphibole Fe/Mg exchange coefficient (KD), Rayleigh fractionation, and equilibrium melt calculation indicate that the Early Eocene hornblende gabbro-diorite in the Tengchong Block was created due to plagioclase-dominated accumulation at the mid-upper crust level. Based on the calculation, the corresponding amphibole equilibrium melt is more silicic (dacitic-rhyolitic in composition) than the bulk rocks, indicating a more evolved composition in the mid-upper crust. Three types of plagioclases reveal the multi-recharging and dissolution-reprecipitation promoting the further evolution of these mafic rocks. Therefore, this study concludes that magma recharge and plagioclase-dominated accumulation processes may be important mechanisms for the formation and evolution of mafic magma and the further crustal differentiation at the mid-upper crust level in a continental margin arc. |
| 语种 | 英语 |
| WOS研究方向 | Geochemistry & Geophysics ; Geology |
| WOS类目 | Geochemistry & Geophysics ; Geology |
| WOS记录号 | WOS:001203132000005 |
| 来源期刊 | LITHOSPHERE
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/301059 |
| 作者单位 | Chang'an University; Northwest University Xi'an |
| 推荐引用方式 GB/T 7714 | . Continental Arc Accumulation Mafic Rocks in the Mid-Upper Crust: Constraints From the Early Eocene Hornblende Gabbro-Diorite in the Tengchong Block, Southeastern Extension of Tibet[J],2024,2024(1). |
| APA | (2024).Continental Arc Accumulation Mafic Rocks in the Mid-Upper Crust: Constraints From the Early Eocene Hornblende Gabbro-Diorite in the Tengchong Block, Southeastern Extension of Tibet.LITHOSPHERE,2024(1). |
| MLA | "Continental Arc Accumulation Mafic Rocks in the Mid-Upper Crust: Constraints From the Early Eocene Hornblende Gabbro-Diorite in the Tengchong Block, Southeastern Extension of Tibet".LITHOSPHERE 2024.1(2024). |
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