Carbonation and deformation of oceanic serpentinites in the Elba subduction channel: Evidence for fluid–rock interaction at seismogenic depth

IF 4.8 1区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Earth and Planetary Science Letters Pub Date : 2025-06-18 DOI:10.1016/j.epsl.2025.119488

Samuele Papeschi , Roberto Emanuele Rizzo , Andrea Rielli , Matthew Tarling , Vanni Moggi Cecchi , Elena Pecchioni , Chiara Boschi , Keishi Okazaki , Takehiro Hirose , Paola Vannucchi

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引用次数: 0

Abstract

We present a multi-disciplinary investigation of the deformation and carbonation history of oceanic serpentinites involved in the plate interface of the Cretaceous-Eocene subduction complex exposed in the Elba Island —an exceptionally well-preserved example of oceanic subduction system. Using an integrated set of structural, petrographic, and geochemical analyses, we document antigorite growth and carbonation of oceanic serpentinites in the Elba subduction channel at shallow-intermediate depths (<22-26 km; P <0.6-0.7 GPa). Carbonation was associated with brecciation and shearing that produced a complex of tectonic slices (Norsi area) and a tectonic mélange (Cavo area). The carbonation process was likely triggered by the release of CO₂-rich fluids from subducting oceanic serpentinites and ophicarbonate rocks, as indicated by C and O isotopes. The ingress of external CO₂ in shear zones likely ignited a positive feedback between deformation, carbonation, and fluid flow, promoting talc formation and leading to strain localization at the plate interface. The Elba subduction channel offers a unique window on the evolution of subduction systems at low pressure, highlighting the importance of fluid-induced reactions in controlling deformation style.

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厄尔巴岛俯冲水道中海洋蛇纹岩的碳酸化和变形：发震深度流体-岩石相互作用的证据

我们对厄尔巴岛白垩纪-始新世俯冲复合体的板块界面中海洋蛇纹岩的变形和碳酸化历史进行了多学科的研究，厄尔巴岛是一个保存完好的海洋俯冲系统的例子。通过一套完整的构造、岩石学和地球化学分析，我们记录了厄尔巴岛俯冲通道中浅-中深度(22-26 km；P <0.6-0.7 GPa)。碳酸化作用与角化和剪切作用有关，形成了构造片（Norsi地区）复合体和构造片（Cavo地区）。碳同位素和氧同位素表明，碳酸化过程可能是由俯冲的海洋蛇纹岩和蛇碳酸盐岩石释放的富含二氧化碳的流体引发的。剪切区外部CO2的进入可能引发了变形、碳酸化和流体流动之间的正反馈，促进了滑石的形成，并导致了板界面应变局部化。厄尔巴岛俯冲通道为研究低压下俯冲系统的演化提供了一个独特的窗口，突出了流体诱导反应在控制变形样式方面的重要性。

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来源期刊

Earth and Planetary Science Letters 地学-地球化学与地球物理

CiteScore

10.30

自引率

5.70%

发文量

475

审稿时长

2.8 months

期刊介绍： Earth and Planetary Science Letters (EPSL) is a leading journal for researchers across the entire Earth and planetary sciences community. It publishes concise, exciting, high-impact articles ("Letters") of broad interest. Its focus is on physical and chemical processes, the evolution and general properties of the Earth and planets - from their deep interiors to their atmospheres. EPSL also includes a Frontiers section, featuring invited high-profile synthesis articles by leading experts on timely topics to bring cutting-edge research to the wider community.