Syn- and post-collisional potassic to ultrapotassic alkaline and subalkaline volcanic rocks: Heterogeneous mantle metasomatism beneath the North Qaidam orogenic belt

Qiao, Jinran; Zhou, Chen-Ao; Dong, Jie; Allen, Matthew; Yang, Liming; Su, Li; Song, Shuguang

doi:10.1016/j.lithos.2023.107081

Cited by 2 publications

(1 citation statement)

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“…Heterogeneity in the Earth's mantle has been vastly documented through numerous mineralogical, geochemical, and experimental studies of rocks and magmas (e.g., Allègre and Turcotte 1986;Qian et al 2022;Qiao et al 2023;Sobolev et al 2005;Stachel et al 2018;Stracke 2012 among others). Geophysical studies have also revealed significant variations in the seismic velocity and density of the mantle, indicating the existence of different domains at This is the peer-reviewed, final accepted version for American Mineralogist, published by the Mineralogical Society of America.…”

Section: Introductionmentioning

confidence: 99%

Reaction between volatile-bearing eclogite and harzburgite as a function of degree of interaction: Experimental constraints at 4 GPa

Elazar,

Kessel

2024

American Mineralogist

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The mantle is known to be heterogeneous, mainly composed of peridotite and eclogite.Eclogite-derived hydrous melts may interact with harzburgite at the slab-mantle interface in subduction zones or in the sub-continental lithospheric mantle. In this study, such interactions were simulated by performing hybrid experiments in which a layer of eclogite has been juxtaposed to a layer of harzburgite, in the presence of H 2 O-CO 2 at 4 GPa and 1200 o C, conditions where eclogite is super-solidus while harzburgite is sub-solidus. A diamond trap was placed in between the two layers in order to trap the fluid or melt phase, allowing direct determination of their composition. The multi-anvil was rotated in different frequencies in order to examine the effect of increasing degree of interaction on the melt composition as well as the mineral compositions. The interaction of eclogite-derived hydrous melt and harzburgite results in a reaction layer at the interface between the two lithologies, composed of opx and garnet. The harzburgite above the reaction layer is metasomatized, containing various This is the peer-reviewed, final accepted version for American Mineralogist, published by the Mineralogical Society of America.The published version is subject to change. Cite as Authors (Year) Title. American Mineralogist, in press.

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Section: Introductionmentioning

confidence: 99%