Sediment Melts at Sub-arc Depths: an Experimental Study

Hermann, Jörg; Spandler, Carl

doi:10.1093/petrology/egm073

Cited by 451 publications

(366 citation statements)

References 76 publications

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“…The Nd-Hf isotopic compositions of the subducted sediment component are assumed from the global marine sediments (Vervoort et al, 2011), while the Nd and Hf concentrations are estimated from the average global subducted sediment (GLOSS, Plank and Langmuir, 1998). The bulk partition coefficients (K D ) during sediment melting are estimated with a residual mineral assemblage of garnet + pyroxene + K-rich mineral (e.g., phengite) + Al-rich mineral (e.g., zoisite and allanite) with no or little plagioclase (Hermann and Spandler, 2008;Guo et al, 2014). The calculation parameters are listed in the figure. mixing between the gabbroic magmas and felsic crust-derived granitic melt.…”

Section: Possible Genetic Relationship Between the Gabbros And Dioritesmentioning

confidence: 99%

“…Note: The selection of trace element compositions of depleted mantle (DM) and subducted sediment are the same as those reported in Guo et al (2015, Appendix 6). The bulk partition coefficients (K D ) during sediment melting are estimated with a residual mineral assemblage of garnet + pyroxene + K-rich mineral (e.g., phengite) + Al-rich mineral (e.g., zoisite and allanite) with no or little plagioclase (Hermann and Spandler, 2008;Guo et al, 2014). During mantle melting, the partition coefficients are estimated with a residual assemblage of spinel + amphibole + olivine + pyroxene.…”

Section: Nature Of the Mantle Sourcementioning

confidence: 99%

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Variable sediment flux in generation of Permian subduction-related mafic intrusions from the Yanbian region, NE China

Guo

et al. 2016

Lithos

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Section: Possible Genetic Relationship Between the Gabbros And Dioritesmentioning

confidence: 99%

Section: Nature Of the Mantle Sourcementioning

confidence: 99%

Variable sediment flux in generation of Permian subduction-related mafic intrusions from the Yanbian region, NE China

Guo

et al. 2016

Lithos

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“…In the following sections, we compare K 2 O and SiO 2 contents of the northern China adakites to data from partial melting experiments to constrain their source compositions. , melt data [95][96][97][98][99][100][101][102][103][104][105][106][107][108][109]); (b) compared with experimental partial melts of low-K basalts [110][111][112][113][114][115][116][117][118][119]; (c) compared with experimental partial melts of middle-K and high-K basalts [44,87,116,120,121]; (d) SiO 2 vs. K 2 O for Mesozoic xenolith granulites, terrane granulites and Precambrian basic volcanic rocks in the North China Craton (Xinyang granulite xenoliths [122], Inner Mongolia granulites [123], terrane granulites [124,[125][126][127], and Precambrian basic volcanic rocks [128]). …”

Section: Source Composition Of Northern China Adakitesmentioning

confidence: 99%

Adakitic rocks and destruction of the North China Craton: Evidence from experimental petrology and geochemistry

Xiong

Liu

Zhu

et al. 2011

Sci. China Earth Sci.

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The general temporal-spatial consistency for the formation of adakitic rocks and lithospheric thinning in northern China provide a window to examine the processes and mechanism for the destruction of the North China Craton. With experimental petrology data, this paper demonstrates that the adakitic rocks in northern China are the products of partial melting of middle-to high-potassic metabasalts at the base of the lower continent crust. Based on the TiO 2 solubility model, many adakitic rocks in Dabie, Jiaodong and the northern part of the craton appear to have been saturated with TiO 2 . This indicates the presence of a Ti-rich accessory phase in their source regions. This phase must be rutile based on the decreasing Nb/La with increasing La/Yb in the adakitic rocks. The adakitic magmas were, thus, derived from a depth of more than 50 km, based on pressures (higher than 1.5 GPa) for the stability of rutile in a metabasalt system. Because present-day crustal thickness is generally only 35 km, we suggest that the destruction of the North China Craton may have led to at least 15 km of thinning or delamination of the crust.

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“…Since both environments are important regarding the investigation of crustal genesis and differentiation processes (e.g. Vielzeuf et al 1990;Schmidt et al 2004;Hermann and Spandler 2008;Hacker et al 2011;Sawyer et al 2011;Brown 2013), high P granulites are particularly relevant rocks for the study of MI.…”

Section: Introductionmentioning

confidence: 99%

The composition of nanogranitoids in migmatites overlying the Ronda peridotites (Betic Cordillera, S Spain): the anatectic history of a polymetamorphic basement

Acosta-Vigil

Barich

Bartoli

et al. 2016

Contrib Mineral Petrol

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The study of the composition of primary melts during anatexis of high-pressure granulitic migmatites is relevant to understand the generation and differentiation of continental crust.Peritectic minerals in migmatites can trap dropless of melt that forms via incongruent melting reactions during crustal anatexis. These melt inclusions commonly crystallize and form nanogranitoids upon slow cooling of the anatectic terrane. To obtain the primary compositions of crustal melts recorded in these nanogranitoids, including volatile concentrations and information on fluid regimes, they must be remelted and rehomogenize before analysis. A new occurrence of nanogranitoids was recently reported in garnets of mylonitic metapelitic gneisses (former high pressure granulitic migmatites) at the bottom of the prograde metamorphic sequence of Jubrique, located on top of the Ronda peridotite slab (Betic Cordillera, S Spain). Nanogranitoids within separated chips of cores and rims of large garnets from these former migmatites were remelted at 15 kbar and 850, 825 or 800 ºC and dry (without added H 2 O), during 24 hours, using a piston cylinder apparatus. Although all experiments show glass (former melt) within melt inclusions, the extent of rehomogenization depends on the experimental temperature. Experiments at 850-825 ºC show abundant disequilibrium microstructures, whereas those at 800 ºC show a relatively high proportion of rehomogenized nanogranitoids, indicating that anatexis and entrapment of melt inclusions in these rocks was likely close to 800 ºC. Electron microprobe and NanoSIMS analyses show that experimental glasses are leucogranitoid and peraluminous, though define two distinct compositional groups. Type I corresponds to K-rich, Ca-and H 2 O-poor leucogranitic melts, whereas type II represents K-poor, Ca-and H 2 O-rich granodioritic to tonalitic melts. Type I and II melt inclusions are found in most cases at the cores and rims of large garnets, respectively. We tentatively suggest that these former migmatites underwent two melting events under contrasting fluid regimes, possibly during two different orogenic periods. This 3 study demonstrates the strong potential of melt inclusions studies in migmatites and granulites in order to unravel their anatectic history, particularly in strongly deformed rocks where most of the classical anatectic microstructures have been erased during deformation.

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Sediment Melts at Sub-arc Depths: an Experimental Study

Cited by 451 publications

References 76 publications

Variable sediment flux in generation of Permian subduction-related mafic intrusions from the Yanbian region, NE China

Variable sediment flux in generation of Permian subduction-related mafic intrusions from the Yanbian region, NE China

Adakitic rocks and destruction of the North China Craton: Evidence from experimental petrology and geochemistry

The composition of nanogranitoids in migmatites overlying the Ronda peridotites (Betic Cordillera, S Spain): the anatectic history of a polymetamorphic basement

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