应用岩屑磷灰石 U-Pb 地质年代学和微量元素进行产地分析,雅鲁藏布江沙地研究的启示

IF 4.1 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Yufeng Du, Guangwei Li, Danyang Liu, Xianyan Wang, Dongxu Cai, Xiaolu Dong, Qi Yu
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引用次数: 0

摘要

具有特定痕量元素地球化学性质的碎屑含铀矿物(如锆石、磷灰石)U-Pb年龄经常被用于产地分析。在本研究中,我们重点研究了藏南雅砻江流域,该流域有两个不同的岩性单元:北面的冈底斯浴成岩(主要为花岗岩)和南面的哲罗喜马拉雅山(主要为沉积岩)在青藏高原的侵蚀过程中起着至关重要的作用。为了确定雅鲁藏布江盆地的成因,我们对雅鲁藏布江及其支流河沙中的碎屑磷灰石进行了痕量元素和U-Pb年龄分析。我们的研究结果表明,北支流的碎屑磷灰石 U-Pb 年龄模式在大约 40 和 60 Ma 处显示出主峰,与已发表的碎屑锆石的相应 U-Pb 年龄模式一致。此外,它们的微量元素铸型主要位于I型花岗岩区域,这也表明了以冈底斯弧为主的来源。然而,南部支流的锆石(60-20 Ma)与锆英石U-Pb组(110-150 Ma、500 Ma和1100 Ma)呈现出不同的年龄分布,这表明详细的磷灰石U-Pb信号可以对火成岩和变质岩的来源提供很好的约束,但对沉积岩来源的约束则较弱。结合研究区以前的碎屑锆石数据,我们的碎屑磷灰石信息可以突出来自复杂背景(即尼洋河和年楚河)的年轻变质事件,这为雅鲁藏布江盆地的来源提供了额外的约束。一般来说,锆石和磷灰石等多铁重金属矿物的地球化学和地质年代学相结合,可为产地分析提供强有力的工具。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Application of Detrital Apatite U-Pb Geochronology and Trace Elements for Provenance Analysis, Insights from a Study on the Yarlung River Sand

Detrital U-bearing minerals (e.g., zircon, apatite) U-Pb ages with specific trace-element geochemistry, are frequently used in provenance analyses. In this study, we focus on the Yarlung River drainage in South Tibet, characterized by two distinct lithologic units: The Gangdese batholith to the north (mainly granitoids) and the Tethyan Himalaya (mainly sedimentary rocks) to the south, which plays a crucial role in the erosion of the Tibetan Plateau. To constrain the provenance of the Yarlung River Basin, we performed trace-element and U-Pb age analyses of detrital apatite from the river sands of the Yarlung River and its tributaries. Our findings indicate that the detrital apatite U-Pb age patterns of the north tributaries exhibit main peaks at approximately 40 and 60 Ma, consistent with the corresponding U-Pb age patterns of detrital zircon published. Further, their trace element casts fall mainly in the Type I granite region, also indicating the Gangdese arc-dominated source. However, those of the south tributaries (∼60–20 Ma) exhibit a different age distribution from the detrital zircon U-Pb groups (∼110–150, ∼500, and 1 100 Ma), suggesting that the detailed apatite U-Pb signals can provide excellent constraints on the provenance of igneous and metamorphic rock sources but less so for sedimentary rock sources. Combined with previous detrital zircon data in the study area, our detrital apatite information can highlight young metamorphic events from a complex background (i.e., Niyang and Nianchu rivers), which offers additional constraints on the provenance of the Yarlung River Basin. Generally, a combination of geochemistry and geochronology of multi-detrital heavy minerals, such as zircon and apatite, can provide powerful tools for provenance analysis.

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来源期刊
Journal of Earth Science
Journal of Earth Science 地学-地球科学综合
CiteScore
5.50
自引率
12.10%
发文量
128
审稿时长
4.5 months
期刊介绍: Journal of Earth Science (previously known as Journal of China University of Geosciences), issued bimonthly through China University of Geosciences, covers all branches of geology and related technology in the exploration and utilization of earth resources. Founded in 1990 as the Journal of China University of Geosciences, this publication is expanding its breadth of coverage to an international scope. Coverage includes such topics as geology, petrology, mineralogy, ore deposit geology, tectonics, paleontology, stratigraphy, sedimentology, geochemistry, geophysics and environmental sciences. Articles published in recent issues include Tectonics in the Northwestern West Philippine Basin; Creep Damage Characteristics of Soft Rock under Disturbance Loads; Simplicial Indicator Kriging; Tephra Discovered in High Resolution Peat Sediment and Its Indication to Climatic Event. The journal offers discussion of new theories, methods and discoveries; reports on recent achievements in the geosciences; and timely reviews of selected subjects.
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