Climate Change Data Portal
| DOI | 10.1016/j.lithos.2024.107558 |
| Early Paleocene diorite and bimodal dykes from the Dagze region, southern Lhasa Terrane: Tectonic implications for the late-stage of Neo-Tethyan subduction | |
| 发表日期 | 2024 |
| ISSN | 0024-4937 |
| EISSN | 1872-6143 |
| 起始页码 | 472 |
| 卷号 | 472 |
| 英文摘要 | The tectonic transition from oceanic subduction to continental collision is a fundamental process during orogenesis. Yet, the nature of this transition and its deep geodynamic processes for the southern Tibetan Plateau remain contentious. This study presents zircon U-Pb-Hf isotopes, whole -rock geochemistry, and Sr-Nd isotopes for a quartz diorite intrusion and bimodal dykes from Dagze, combined with compiled data from the southern Lhasa subterrane, to reveal the geodynamic processes of late -stage of Neo-Tethyan subduction. Most of Dagze samples were emplaced between 66 and 64 Ma, while muscovite granite aplite dykes were emplaced between 64 and 60 Ma. They exhibit relatively uniform, depleted Sr-Nd isotopes, with epsilon Nd(t) values ranging from +2.2 to +4.0, positive zircon epsilon Hf(t) values, and young depleted mantle model ages. Both exhibit compositional characteristics of subduction-related arc magma, marked by the enrichment of large ion lithophile elements and the depletion of high field strength elements. The mafic dykes with relatively low SiO2, high MgO, Cr, Ni, possibly originated from a fluid-metasomatized depleted mantle. The quartz diorite intrusion with low MgO, Cr, and Ni was generated by partial melting of sub -arc lithospheric mantle and experienced subsequent fractional crystallization of amphibole, clinopyroxene and orthopyroxene. The granitic dykes originated from partial melting of Gangdese juvenile crust and experienced fractional crystallization dominated by plagioclase. We suggest that the slab rollback and continental collision conjointly controlled the evolution of the latest Cretaceous to Paleocene Himalayan-Tibetan orogeny. Slab rollback of Neo-Tethys commenced around 70 Ma, triggering the partial melting of depleted mantle and juvenile crust, and this process resulted in the formation of Dagze diorites and bimodal dykes with arc affinity. |
| 英文关键词 | Lhasa Terrane; Bimodal dykes; Neo-Tethyan subduction; Slab rollback |
| 语种 | 英语 |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| WOS类目 | Geochemistry & Geophysics ; Mineralogy |
| WOS记录号 | WOS:001203752200001 |
| 来源期刊 | LITHOS
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/303619 |
| 作者单位 | Shandong University of Science & Technology |
| 推荐引用方式 GB/T 7714 | . Early Paleocene diorite and bimodal dykes from the Dagze region, southern Lhasa Terrane: Tectonic implications for the late-stage of Neo-Tethyan subduction[J],2024,472. |
| APA | (2024).Early Paleocene diorite and bimodal dykes from the Dagze region, southern Lhasa Terrane: Tectonic implications for the late-stage of Neo-Tethyan subduction.LITHOS,472. |
| MLA | "Early Paleocene diorite and bimodal dykes from the Dagze region, southern Lhasa Terrane: Tectonic implications for the late-stage of Neo-Tethyan subduction".LITHOS 472(2024). |
| 条目包含的文件 | 条目无相关文件。 | |||||
| 个性服务 |
| 推荐该条目 |
| 保存到收藏夹 |
| 导出为Endnote文件 |
| 谷歌学术 |
| 谷歌学术中相似的文章 |
| 百度学术 |
| 百度学术中相似的文章 |
| 必应学术 |
| 必应学术中相似的文章 |
| 相关权益政策 |
| 暂无数据 |
| 收藏/分享 |
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。
