Hornblendites as a record of differentiation, metasomatism and …
2024年4月5日 · Metasomatism, widespread and long-term fractionation of amphibole ± garnet ± clinopyroxene, and high oxygen fugacity, are all positive indicators for the fertility of arc magmas with respect to porphyry copper formation.
Middle-crust accumulation of hornblendite and pyroxenes …
2021年4月1日 · In the quartz monzonite/monzonite, extensive K-, Na-metasomatism of plagioclase and metasomatism of hornblende into biotite suggest mixing of K-, Na- and Si-rich felsic magma into Al-, Ca-rich magma. Quantitative modeling can reproduce the complementarity of the two categories of rock with alkali-feldspar granite as Stage 2 residual melt.
Hornblendites as a record of differentiation, metasomatism and …
2024年4月5日 · Metasomatism, widespread and long-term fractionation of amphibole ± garnet ± clinopyroxene, and high oxygen fugacity, are all positive indicators for the fertility of arc magmas with respect to porphyry copper formation. This study demonstrates that late-stage melt-mush interaction can contribute to peritectic hornblendite formation and ...
Geochemical insights into the role of metasomatic hornblendite in ...
2014年9月13日 · Experimental petrology suggested the role of hornblendite in generating alkali basalt. This mechanism is confirmed by an integrated study of major-trace elements and radiogenic isotopes for Mesozoic alkali basalts from the Qinling orogen in China.
Origin of Early Triassic Hornblende Gabbro from the Yunkai
2024年5月29日 · The combined mineral and bulk-rock geochemical data suggest that the primary magma for the Tengxian hornblende gabbro was derived from a mantle wedge that had been metasomatized by voluminous subducted terrigenous sediment-derived melts in response to subduction of the Paleo-Tethys Ocean.
Hornblendite delineates zones of mass transfer through the lower crust
2016年8月22日 · High melt/rock ratios and disequilibrium between the migrating magma (granodiorite) and its host gabbroic gneiss induced dissolution (grain-scale magmatic assimilation) of gneiss and...
Formation of Late Paleoproterozoic Gaositai Hornblendite in
2022年8月19日 · Both hornblende and its equilibrium melt compositions show strongly fractionated HREE patterns, relative enrichments in LREEs and LILEs, and depletions in HREEs and HFSEs. The phlogopite-bearing hornblendite magma could have originated from a hydrous garnet-facies mantle source metasomatized by slab-derived silicate melt.
A case for hornblende dominated fractionation of arc magmas …
2011年10月4日 · Hornblende plagioclase thermometry (Holland and Blundy 1994) assuming a pressure of 1.0 GPa yields similar temperature to the two pyroxene thermometer and ranges from 750 to 850°C in gabbros and hornblende bearing tonalite.
Metasomatism in Subduction Zones of Subducted Oceanic …
2012年1月1日 · Hornblende, with igneous compositions, shows replacement by sodic amphibole and igneous plagioclase is entirely replaced by phengite with minor lawsonite (see textures in the photomicrograph in Fig. 9.6a). Both observations are consistent with significant metasomatism (or at least final reequilibration) of the cobbles under lawsonite-blueschist ...
A Review of the Geodynamic Significance of Hornblende-Bearing ...
2013年11月27日 · Ultramafic rocks consist mainly of hornblendite, hornblende peridotite, hornblende pyroxenite, and dunite. Despite upper amphibolite to granulite facies metamorphism, poly-phase deformation and multiple granitoid intrusions, primary igneous layers and mineral assemblages have been well preserved.
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