富碳酸盐沉积物俯冲过程中 Nb/Ta 的分馏

IF 3.4 1区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Geochemical Perspectives Letters Pub Date : 2024-03-05 DOI:10.7185/geochemlet.2410

A. Bragagni, R. Avanzinelli, C. Münker, F. Mastroianni, S. Conticelli

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引用次数: 0

摘要

我们报告了意大利上第四纪岩浆的高精度高场强元素（HFSE）浓度。罗马岩浆区硅不饱和岩石显示出较高的 Nb/Ta。相反，托斯卡纳岩浆区早期硅过饱和岩石的 Nb/Ta 却没有分馏。我们展示的证据表明，罗马岩浆的高Nb/Ta反映了源自俯冲的富含碳酸盐的熔体。类似的熔体也可能解释了环地中海（如马其顿、保加利亚、土耳其）和巽他弧的其他二氧化硅不饱和岩浆的高 Nb/Ta，以前解释为反映了残余金红石。我们提出了高 Nb/Ta、硅不饱和岩浆与富含碳酸盐岩体通过俯冲再循环之间的遗传联系。因此，Nb/Ta可用来追踪俯冲碳酸盐岩的再循环。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Fractionation of Nb/Ta during subduction of carbonate-rich sediments

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Fractionation of Nb/Ta during subduction of carbonate-rich sediments

We report high precision high field strength element (HFSE) concentrations of Italian Plio-Quaternary mafic magmas. Silica-undersaturated rocks of the Roman magmatic province show high Nb/Ta. Instead, earlier silica-oversaturated rocks of the Tuscan magmatic province have unfractionated Nb/Ta. We show evidence that the high Nb/Ta of Roman magmas reflects subduction-derived, carbonate-rich melts. Similar melts may also account for high Nb/Ta in other silica-undersaturated magmas from the circum-Mediterranean (e.g., Macedonia, Bulgaria, Turkey) and the Sunda arc, previously interpreted to reflect residual rutile. We propose a genetic link between high Nb/Ta, silica-undersaturated magmas and recycling of carbonate-rich lithologies via subduction. As such, Nb/Ta can be used to trace the recycling of subducting carbonates.

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来源期刊

Geochemical Perspectives Letters Earth and Planetary Sciences-Geochemistry and Petrology

CiteScore

7.00

自引率

2.00%

发文量

审稿时长

15 weeks

期刊介绍： Geochemical Perspectives Letters is an open access, internationally peer-reviewed journal of the European Association of Geochemistry (EAG) that publishes short, highest-quality articles spanning geochemical sciences. The journal aims at rapid publication of the most novel research in geochemistry with a focus on outstanding quality, international importance, originality, and stimulating new developments across the vast array of geochemical disciplines.