深岩石圈低δ18O再循环地壳同化对原金伯利岩熔体改造的氧同位素约束

IF 4.5 1区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Geochimica et Cosmochimica Acta Pub Date : 2024-12-25 DOI:10.1016/j.gca.2024.12.028

Joshua van Blerk, Geoffrey H. Howarth, Chris Harris, Philip E. Janney

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引用次数: 0

摘要

金伯利岩中的巨晶是大的（>；1厘米）矿物颗粒，由亚岩石圈原金伯利岩熔体在下次大陆岩石圈地幔（SCLM）中结晶而成，通常经过复杂的熔融-SCLM相互作用。了解原金伯利岩熔体系统的发展有两个重要的原因：1)控制在地表喷发的金伯利岩中观察到的熔体多样化和Mg#的范围；2)它与深部岩石圈中的金刚石破坏有关。本文对来自南非修道院金伯利岩的一组特征良好的巨晶岩的δ18O值进行了分析，以评估熔体δ18O的变化，以及熔体- sclm相互作用对幔源岩浆初级δ18O的影响，并进一步限制了深部岩石圈中原金伯利岩熔体系统的发育。

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Oxygen isotope constraints on proto-kimberlite melt modification through assimilation of low δ18O recycled crust in the deep lithosphere

Megacrysts in kimberlite are large (>1 cm) mineral grains that crystallized from sub-lithospheric proto-kimberlite melts in the lower sub-continental lithospheric mantle (SCLM), often after complex melt-SCLM interactions. Understanding the development of the proto-kimberlite melt system is important for two primary reasons: 1) a control on the melt diversification and range in Mg# observed in kimberlites that erupt at the surface and 2) it is associated with diamond-destruction in the deep lithosphere. We present δ18O values for a well-characterized suite of megacrysts from the Monastery kimberlite, South Africa, to evaluate variations in melt δ18O, the effect of melt-SCLM interactions on the primary δ18O of mantle-derived magmas, and further constrain the development of the proto-kimberlite melt system in the deep lithosphere.

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来源期刊

Geochimica et Cosmochimica Acta 地学-地球化学与地球物理

CiteScore

9.60

自引率

14.00%

发文量

437

审稿时长

6 months

期刊介绍： Geochimica et Cosmochimica Acta publishes research papers in a wide range of subjects in terrestrial geochemistry, meteoritics, and planetary geochemistry. The scope of the journal includes: 1). Physical chemistry of gases, aqueous solutions, glasses, and crystalline solids 2). Igneous and metamorphic petrology 3). Chemical processes in the atmosphere, hydrosphere, biosphere, and lithosphere of the Earth 4). Organic geochemistry 5). Isotope geochemistry 6). Meteoritics and meteorite impacts 7). Lunar science; and 8). Planetary geochemistry.