近代板内玄武岩火山元素和放射性成因同位素组成的区域差异：纵向省份的新视角

IF 3.6 2区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Chemical Geology Pub Date : 2025-09-05 DOI:10.1016/j.chemgeo.2025.123032

David A. Wood

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引用次数: 0

摘要

本文对来自85个广泛地区的5980个新近（<10 Ma）板内玄武岩样本进行了分析，以一种新颖的方式对全球主要、少量和微量元素以及放射性成因Nd、Sr和Pb同位素比值分布和趋势提供了高水平的认识。“高级别”一词指的是省级解释，而不是详细的区域或地方解释。研究区域分为六个纵向太平洋省（PAC）；大西洋(ATL);欧洲/中东非洲（EMA）；印度洋（IND）、东亚（ESA）和澳大拉西亚（AUS）。计算这些省份的平均成分值，并将所考虑地区的算术平均成分用作全球参考点（WLD）。区域平均沿从正常洋中脊玄武岩（N-MORB）到不相容元素和sr同位素富组成的趋势有系统地分布，6省在不同的位置。PAC、ATL和IND在WLD与N-MORB之间的地块以洋岛和洋壳为主，EMA、ESA和AUS在WLD不相容元素富集侧以大陆地壳组成的大块地块为主。各省在铅同位素比率方面的定位略有不同。对于ESA，这些比率以与N-MORB相似的方式消耗，并且与其他省份相比，在WLD的另一侧绘制。将元素和同位素比值值与WLD组成进行归一化处理，得到6个省15种微量元素、Pb-、Nd-和sr -同位素比值的归一化剖面。三元图，特别是Th-Hf-Ta和K2O/TiO2-Hf/Th-207Pb/206Pb，为板内玄武岩成分的高水平基准测试提供了有用的表征显示。观察到的趋势表明，上地幔存在大量而系统的非均质性，表明存在复杂的成岩过程。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Regional variations in elemental and radiogenic isotope compositions of recent intraplate basaltic volcanics: Novel perspectives from longitudinal provinces

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Regional variations in elemental and radiogenic isotope compositions of recent intraplate basaltic volcanics: Novel perspectives from longitudinal provinces

A compiled dataset of 5980 recent (<10 Ma) intraplate basaltic rock samples from 85 widespread regions is evaluated in a novel way to provide high-level insight into worldwide major, minor, and trace element, and radiogenic Nd, Sr and Pb isotope ratio distributions and trends. The term “high-level” is used to refer to provincial rather than detailed regional or local interpretations. The studied regions are divided into six longitudinal provinces Pacific (PAC); Atlantic (ATL); Europe/ Middle East Africa (EMA); Indian Ocean (IND), East Asia (ESA), and Australasia (AUS). Average compositional values are computed for these provinces and the arithmetic average composition of the considered regions is used as a worldwide reference point (WLD). The region averages are distributed systematically along trends extending from normal mid-ocean ridge basalt (N-MORB) to incompatible element and Sr-isotope enriched compositions with the six provinces plotting in distinct positions. PAC, ATL and IND dominated, by ocean islands and oceanic crust, plot between WLD and N-MORB, whereas EMA, ESA and AUS, dominated by large landmasses composed of continental crust plot towards the incompatible-element enriched side of WLD. The provinces are positioned somewhat differently for Pb-isotope ratios. For ESA, these ratios are depleted in similar ways to N-MORB and plot on the opposite side of WLD compared to the other provinces. Normalizing elemental and isotope-ratio values to WLD compositions results in distinctive normalized profiles for the six provinces defined by 15 trace elements, Pb-, Nd- and Sr-isotope ratios. Ternary diagrams, specifically Th-Hf-Ta and K₂O/TiO₂-Hf/Th-²⁰⁷Pb/²⁰⁶Pb, the latter introduced in this study, provide useful characterization displays for high-level benchmarking of intraplate basalt compositions. The observed trends imply substantial but systematic upper mantle heterogeneity that are indicative of complex petrogenetic processes.

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来源期刊

Chemical Geology 地学-地球化学与地球物理

CiteScore

7.20

自引率

10.30%

发文量

374

审稿时长

3.6 months

期刊介绍： Chemical Geology is an international journal that publishes original research papers on isotopic and elemental geochemistry, geochronology and cosmochemistry. The Journal focuses on chemical processes in igneous, metamorphic, and sedimentary petrology, low- and high-temperature aqueous solutions, biogeochemistry, the environment and cosmochemistry. Papers that are field, experimentally, or computationally based are appropriate if they are of broad international interest. The Journal generally does not publish papers that are primarily of regional or local interest, or which are primarily focused on remediation and applied geochemistry. The Journal also welcomes innovative papers dealing with significant analytical advances that are of wide interest in the community and extend significantly beyond the scope of what would be included in the methods section of a standard research paper.