缓慢扩张的大洋堆积过程中显著的熔融-泥沙反应的岩石学证据

IF 2.9 2区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Geochemistry Geophysics Geosystems Pub Date : 2024-08-21 DOI:10.1029/2023GC011409
Marine Boulanger, Marguerite Godard, Benoit Ildefonse, Malissa Bakouche
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引用次数: 0

摘要

岩石圈的结构和沿缓展海脊不同位置发现的相关岩浆系统可能会有巨大的差异,从熔体匮乏的地段到岩浆旺盛的地段。越来越多的研究表明,岩浆地壳的演化仅受部分结晶的影响过于简单。迁移熔体与其周围环境之间的反应在增生过程中起着关键作用,但其影响的全面程度仍有待解决。我们在此介绍对凯恩巨岩和亚特兰蒂斯块状大洋地核复合体的两个钻探序列进行岩石学、微结构和现场地球化学研究的结果。我们的研究表明,熔融-淤积反应在厘米尺度上产生了局部强烈的纹理和/或地球化学异质性,但在 100 米尺度上也能发现它们的影响。除了之前在其他慢扩张岩浆系统中描述的典型熔融-淤积反应之外,我们还在这两个地点的辉长岩序列中发现了不同程度的可能源于地幔的原始岩性同化证据。观测和数值模拟证实了影响这两个序列的反应的相似性。然而,在凯恩巨岩和亚特兰蒂斯丘之间,反应机制(同化与结晶比率的范围)似乎有所不同,这种变化很可能是熔融-淤积反应过程中存在的熔体分数不同造成的。根据我们的观测结果和以往的研究,我们推断反应机制很可能是由两个断面形成过程中的熔融通量控制的。
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Petrological Evidence for Prominent Melt-Mush Reactions During Slow-Spreading Oceanic Accretion

The structure of the lithosphere and the associated magmatic systems found in different locations along slow-spreading ridges can vary dramatically, from melt-starved to magmatically robust segments. A growing number of studies suggest that the evolution of the magmatic crust being governed solely by fractional crystallization is too simplistic. Reactions between migrating melts and their surroundings play a key role during accretion, yet the full extent of their impact is still to be resolved. We present here the results of a petrological, microstructural, and in situ geochemical study of two drilled sequences from the Kane Megamullion and Atlantis Massif oceanic core complexes. We show that melt-mush reactions generate locally strong textural and/or geochemical heterogeneity at the cm-scale, but their impact can also be identified at the 100 m-scale. We found evidence for assimilation at various degrees of primitive lithologies of potential mantle origin within the gabbroic sequence at both locations, in addition to typical melt-mush reactions previously described in other slow-spread magmatic systems. Observations and numerical modeling confirm the similarity of the reactions impacting both sequences. However, the regime of the reactions (ranges of assimilation to crystallization ratios) seems to vary between Kane Megamullion and Atlantis Massif, variations which likely result from differences in melt fractions present during melt-mush reactions. We infer relying on our observations and previous studies that the regime of the reactions is most likely controlled by the melt flux during the formation of the two sections.

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来源期刊
Geochemistry Geophysics Geosystems
Geochemistry Geophysics Geosystems 地学-地球化学与地球物理
CiteScore
5.90
自引率
11.40%
发文量
252
审稿时长
1 months
期刊介绍: Geochemistry, Geophysics, Geosystems (G3) publishes research papers on Earth and planetary processes with a focus on understanding the Earth as a system. Observational, experimental, and theoretical investigations of the solid Earth, hydrosphere, atmosphere, biosphere, and solar system at all spatial and temporal scales are welcome. Articles should be of broad interest, and interdisciplinary approaches are encouraged. Areas of interest for this peer-reviewed journal include, but are not limited to: The physics and chemistry of the Earth, including its structure, composition, physical properties, dynamics, and evolution Principles and applications of geochemical proxies to studies of Earth history The physical properties, composition, and temporal evolution of the Earth''s major reservoirs and the coupling between them The dynamics of geochemical and biogeochemical cycles at all spatial and temporal scales Physical and cosmochemical constraints on the composition, origin, and evolution of the Earth and other terrestrial planets The chemistry and physics of solar system materials that are relevant to the formation, evolution, and current state of the Earth and the planets Advances in modeling, observation, and experimentation that are of widespread interest in the geosciences.
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