Introduction to Hydrous Mantle

What is/are Hydrous Mantle?

Hydrous Mantle - From the hydrogen isotope ratios, we show that the mantle sources of these melts contained excess water, which implies that a deep hydrous mantle reservoir has been present in the Earth's interior since at least the Palaeoarchaean era (3. ^[1] We use this to suggest that the low-velocity seismic anomalies below Eastern China largely reflect the presence of oxidized and enriched, hotand not necessarily particularly hydrous mantle domains as common interpretation has suggested. ^[2] Progressively more hydrous mantle-derived mafic magmas feed this chamber from below, providing heat, H2O, S and metals, but no unique “fertile” Cu-rich magma was involved in the formation of the deposit. ^[3] The slab window opening induced upwelling of anhydrous mantle and formation of the Fe-Ti gabbro dykes. ^[4] The Lubei primary magmas were derived from 13 to 17 % partial melting of a hydrous mantle containing ∼0. ^[5] Helens dominantly formed by partial melting of metabasaltic lower crust, the geochemical and thermal models of this thesis indicate that the dacites are derived by fractional crystallization from a hydrous mantle-derived endmember with a maximum of 20-30% assimilation of pre-existing crustal material. ^[6] In this study we experimentally determine the effects of mantle metasomatism by sediment- and hydrous mantle melts. ^[7] Magmatism at some intraplate volcanoes and large igneous provinces (LIPs) in continental areas may originate from hydrous mantle upwelling (i. ^[8] The coincidence of (1) the depth of a rheological transition, marked granular to porphyroclastic textures, and (2) the depth of a phase transition, from subsolidus hydrous peridotite to a hydrous mantle with melt in localized pockets, is the remarkable feature of the LAB beneath Ichinomegata. ^[9] We use phase equilibria and trace element modelling to characterize the Hf–Nd isotopic evolution of a chain of melting from anhydrous mantle through hydrated basalt to TTG. ^[10] We report the mineralogy, geochemistry and Sr-Nd-Hf-Pb-Os isotopic compositions of a unique K-rich, hydrous mantle nodule sourced from a 34 Ma ultramafic lamprophyre (alnoite) pipe on the island of Malaita, Ontong Java Plateau, SW Pacific. ^[11] These gabbroic rocks are direct products of mantle basaltic magmas generated by flux melting of the hydrous mantle wedge over subduction zone during Silurian subduction in the CTOB. ^[12] Progressively more hydrous mantlederived mafic magmas feed this chamber from below, providing heat, H2O, S and metals, but no unique “fertile” Cu-rich magma was involved in the formation of the deposit. ^[13]