Introduction to Partial Melting
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Partial Melting sentence examples within enriched lithospheric mantle
Therefore, we proposed that the basaltic parental magma of the Guiping complex originated from partial melting of the enriched lithospheric mantle, which was metasomatized by asthenosphere-related OIB-type basaltic magma.
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Their parental magmas are inferred to have been derived from partial melting of an enriched lithospheric mantle, metasomatized by subduction-related fluids.
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Partial Melting sentence examples within mantle derived magma
The Ledu fine- and medium-grained quartz diorites (~446 and ~452 Ma) are high-K calc-alkaline to shoshonitic and were produced by partial melting of relatively old K-rich mafic crust followed by minor mixing with mantle-derived magmas.
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These granites can be interpreted as resulting from partial melting of ancient crustal materials that have been modified by mantle-derived magmas.
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Partial Melting sentence examples within thickened lower crust
Their parental magma was originated by partial melting of thickened lower crust, under garnet amphibolite facies conditions.
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The adakite-like suites may have formed by partial melting of the thickened lower crust at 35–40 km (for the Early Ordovician arc) and >40 km (for the Middle-Late Triassic arc) depths.
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Partial Melting sentence examples within mafic lower crust
The parental magma was generated by partial melting of mafic lower crust that mixed with upper-crust-derived magma.
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The A-type granites in the Wuyishan Domain were likely derived from partial melting of mafic lower crust with a tonalitic to granodioritic geochemical composition, and the S-type granites were derived from partial melting of a meta-sedimentary source.
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Partial Melting sentence examples within mantle derived mafic
These two roles correspond to two main ways of forming granitic magmas, either by partial melting of pre-existing crustal rocks yielding granitic melts directly, or by fractionation of mantle-derived mafic to intermediate magmas.
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Francois Mountains terrane probably reflects mixtures of mantle-derived mafic inputs and low-degree partial melting of more evolved crustal protoliths.
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Partial Melting sentence examples within juvenile lower crust
Zircon trace element abundances and published Sr-Nd-Hf isotope data of these rocks suggest that the parental magmas for these ore-bearing intrusions were rich in H2O and formed by partial melting of a juvenile lower crust/lithospheric mantle or metasomatized mantle wedge during the northwestward subduction of the Paleo-Asian Ocean before the collision of the Songnen block with the Erguna-Xing’an amalgamated block in the early Carboniferous.
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The HJS granites were most likely derived from partial melting of a thickened juvenile lower crust with amphibole and minor plagioclase as residual phases in the magma source.
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Partial Melting sentence examples within subducted oceanic slab
These characteristics indicate that the Lianghu quartz diorites were derived from the partial melting of subducted oceanic slabs (sediments + fluids), and that they underwent subsequent interaction with peridotite in the mantle wedge, with limited assimilation of crustal materials during magma ascent.
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The adakitic rocks were produced by partial melting of subducted oceanic slab, but the melts were modified by mantle wedge and slab-derived fluids; the non-adakitic rocks were likely derived from partial melts of the middle-lower arc crust; and the gabbro originated from the mantle wedge modified by slab-derived fluids.
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Partial Melting sentence examples within post collisional setting
<p>Adakite‐like potassic rocks are widespread in post-collisional settings and provide potential insights into deep crustal or crust-mantle interaction processes including asthenosphere upwelling, partial melting, lower crustal flow, thickening and collapse of the overthickened orogen.
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Combined with previous studies, our new trace element and S-Pb isotope data suggest that Mo mineralization at Hongtuling is most likely related to magmas derived from partial melting of Late Archean to Paleoproterozoic metamorphic basement rocks under a post-collisional setting related to the collision between the North China Craton and Yangtze Craton, whereas Au mineralization is genetically associated with mantle-derived magmas generated in an extensional setting due to thinning and destruction of subcontinental lithospheric mantle keel beneath the North China Craton.
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Partial Melting sentence examples within whole rock geochemical
Field and petrographic observations, whole-rock geochemical signatures, phase equilibrium and thermodynamically-constrained trace element modelling collectively indicate that partial melting of the orthogneisses took place at T ~ 700 °C and was fluxed by ingress of external water.
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Based on multiple isotopic (Sr–Nd–Hf–O) and whole-rock geochemical characteristics, we conclude that the Late Cretaceous gabbro diorite was derived from partial melting of depleted mantle that had been metasomatized by subducted-sediment-derived melts (~5 vol%).
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Partial Melting sentence examples within rare earth element
Combining these characteristics with their differing Th, Ba, and rare earth element contents and Hf isotopic compositions, we suggest that the LG were formed by partial melting of a depleted mantle wedge metasomatized by slab-derived fluids, whereas the SGD and SAT were formed by interaction between subducted sediment melts and the overlying depleted mantle.
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Partial Melting sentence examples within isotopic data suggest
All these geochemical and isotopic data suggest that the parental magma of adakitic andesites has been produced by partial melting of oceanic basalts under amphibole-eclogite facies conditions during the breakoff of the northern Neotethyan oceanic slab.
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The geochemical and isotopic data suggest that the Hashitu granitic rocks were derived from partial melting of the juvenile lower crust, possibly the Neoproterozoic crust.
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Partial Melting sentence examples within garnet lherzolite source
Compositional variation is largely controlled by fractionation of olivine + clinopyroxene + magnetite/ilmenite + titanite ± kaersutite ± feldspar, with relatively undifferentiated melts being generated by <10% partial melting of a mixed spinel + garnet lherzolite source.
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5%) partial melting of a garnet lherzolite source at the waning of the post-plateau stage, followed by stagnation and high pressure fractionation.
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Partial Melting sentence examples within mid ocean ridge
Igneous differentiation (crystal fractionation, partial melting) and source heterogeneity, in general, are key drivers creating variable chemistry in mid-ocean ridge basalts.
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The metamafic rocks are geochemically similar to mid-ocean-ridge basalt; they were generated by partial melting of isotope-depleted asthenospheric mantle in an intracontinental extensional setting and experienced crustal and continental lithospheric mantle contamination and fractional crystallization.
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Partial Melting sentence examples within subcontinental lithospheric mantle
6 ppm) and were derived from partial melting of metasomatized subcontinental lithospheric mantle and underwent moderate fractional crystallization of minerals (e.
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These geochemical data and the highly enriched zircon Hf isotopes suggest that they were derived from partial melting of enriched subcontinental lithospheric mantle.
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Partial Melting sentence examples within metasomatized lithospheric mantle
9) isotopic compositions as well as inclusions and internal structures suggest that zircon megacrysts were originally derived from partial melting of a metasomatized lithospheric mantle source altered by fluid released from dissolved carbonates during subduction.
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Based on a comprehensive conservation of regional geological, geochemical, and geochronological evidence, the primary magma of the Lubei intrusion was identified that it was derived from the partial melting of metasomatized lithospheric mantle previously modified by subduction events.
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Partial Melting sentence examples within lower continental crust
The formation of the initial magmas of the Kodar granitoids was related to the mantle–crustal interaction during the mixing of primary mafic mantle magmas or their derivatives with anatectic melts derived through partial melting of the Archean lower continental crust of the region under the thermal influence of mafic magma.
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84), indicating that they were derived from partial melting of lower continental crust with the involvement of mafic magma.
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Partial Melting sentence examples within altered oceanic crust
Both elements were delivered by an extraneous sedimentary component mixed with the altered oceanic crust rocks that was involved in the genesis of Beni Bousera garnet pyroxenites, prior to a Proterozoic partial melting event.
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These geochemical features suggest that the Qukou diabases were generated by partial melting of a pyroxenitic source region, and this pyroxenitic mantle source was formed via the metasomatism by HFSE-depleted hydrous melts of subducted slab-derived terrigenous sediments, whereas the Yangboping gabbros were generated from a metasomatite that formed by metasomatic reaction between depleted MORB mantle and subducted slab-derived HFSE-enriched hydrous melts, in which the ratios of altered oceanic crust-derived melts to sediment-derived melts were 90:10–60:40.
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Partial Melting sentence examples within enriched mantle source
High Ti and Zr contents of the melt suggest a possible within plate tectonic setting and enrichment in HFSEs and LREEs suggest that the parent melt could be generated from an enriched mantle source by low degree partial melting of garnet-peridotite layer of the upper mantle.
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In the light of the obtained data and modelling, it can be concluded that the magmas of the adakitic volcanics were derived from enriched mantle source through relatively higher partial melting and experienced magma mixing with melts at the crustal level.
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Partial Melting sentence examples within ancient lower crust
Partial Melting sentence examples within isotopic data indicate
Elemental and isotopic data indicate that the Qiate S-type leucogranite was generated by the partial melting of metasedimentary rocks in the thickened lower continental crust (~ 40–50 km).
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These geochemical and isotopic data indicate that the primary magma of the granite porphyries originated from partial melting of ancient continental crust as a result of basaltic magma underplating and underwent fractionation crystallization during their emplacement.
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Partial Melting sentence examples within light rare earth
They also show enrichment of light rare earth elements (LREEs) and large ion lithophile elements (LILEs), depletion of heavy rare earth elements (HREEs) and high field strength elements (HFSEs), and have a high content of Sr and low content of Y and Yb, suggesting that they were derived from the partial melting of the lower crust.
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The volcanic rocks are characterized as tholeiitic basalt and Al-depleted to Al-undepleted komatiite, have high Nb/Th, flat to positive light rare earth element (REE) slopes, and flat heavy REE slopes, consistent with partial melting of a mantle plume.
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Partial Melting sentence examples within garnet stability field
Tonalite–trondhjemite–granodiorite (TTG), an Archean dominant lithological assemblage within the cratonic provinces, is believed to have been formed by partial melting of the hydrous basalts in the garnet stability field.
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Partial melting modeling suggests that the melting has occurred in the spinel-garnet stability field.
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Partial Melting sentence examples within trace element modelling
Combined with field relationship, Ti-zircon crystallization temperature, trace element modelling and Hf isotopic data, the HOG may be derived from high-temperature contact process that involved the partial melting of granodiorites in contact and interaction with a quartz-bearing dioritic intrusion.
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Numerical trace element modelling suggests that the primary magma in Paka resulted principally from 5 to 10% garnet–peridotite partial melting and possibly 0.
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Partial Melting sentence examples within spinel peridotite mantle
Alkali feldspar granites appear as residue of magma differentiation led by crystal fractionation of liquid derived from the partial melting of spinel peridotite mantle.
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The CRB and CIRB samples exhibit tholeiitic to transitional composition of precursor melts derived by high degree, shallow level partial melting of a spinel peridotite mantle source.
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Partial Melting sentence examples within fractional crystallization crustal
The overall variations in major and trace element compositions especially between the tholeiitic basaltic group and the other two groups cannot be explained by fractional crystallization, crustal contamination or degree of partial melting of a homogeneous mantle source, but rather reflect the involvement of variable mantle sources.
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Partial melting of the metasomatized mantle has led to the formation of primary magma, which eventually has generated diorite, granodiorite, and rhyolite magmas by fractional crystallization, crustal assimilation and magma mixing.
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Partial Melting sentence examples within basaltic lower crust
Partial Melting sentence examples within lithospheric mantle metasomatized
They are interpreted to have formed by partial melting of a spinel-bearing lithospheric mantle metasomatized by limited influx of subduction-related fluids.
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The primary magmas were formed by decompressional partial melting of the lithospheric mantle metasomatized by fluids during former (Paleogene or even earlier) subduction events.
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Partial Melting sentence examples within depleted mantle source
Its compositional characteristics indicate generation by partial melting of a depleted mantle source in an immature oceanic island arc setting.
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Low degree (2–3%) partial melting of a modally and cryptically metasomatized source may have been involved in the generation of alkaline magmas from a depleted mantle source variously contaminated by an enriched endmember.
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Partial Melting sentence examples within heavy rare earth
4, n = 39) and low whole rock heavy rare earth elements (HREE) contents are consistent with large degrees of partial melting (>45%) and garnet exhaustion leaving a dunitic residue with olivine ≥90%, orthopyroxene ≤10% and HREE Dy minimum and high HREE) and Archaean depleted Hf TDM ages (2.
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The Early Cretaceous high-Mg adakitic volcanic rocks (129–117 Ma) are characterized by low Y and heavy rare earth element contents, and high Sr contents and Sr/Y ratios, similar to those of rocks derived from partial melting of an eclogitic source.
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Partial Melting sentence examples within depleted mantle wedge
The gabbroic rocks originated from hydrous partial melting of a depleted-mantle wedge, metasomatized by aqueous fluids released from the subducted oceanic slab, whereas the diorites and MMEs as well as tonalites were generated due to the mixing of mafic magma related to gabbroic rocks and granodioritic magma.
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