Results 181 to 190 of about 806 (206)
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Adakites—the key to understanding LILE depletion in granulites
Lithos, 2005Abstract For more than 20 years, it has been argued that granulites of the lower continental crust are depleted in fluid-mobile elements such as Cs, Rb, U and Th, either because they were removed by melting of the lower crust or through dehydration. We argue that there is little evidence for a simple relationship between granulite-facies metamorphism
Hugh R. Rollinson, John Tarney
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Earth and Planetary Science Letters, 2008
Abstract Abundant dunite and harzbugite xenoliths are preserved in Early Cretaceous high-Mg# [63–67, where Mg# = molar 100 × Mg/(Mg + Fetot)] diorite intrusions from western Shandong in the North China Craton (NCC). Dunite and some harzburgite xenoliths typically preserve areas of orthopyroxenite (sometimes accompanied by phlogopite) either as veins ...
Wenliang Xu +5 more
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Abstract Abundant dunite and harzbugite xenoliths are preserved in Early Cretaceous high-Mg# [63–67, where Mg# = molar 100 × Mg/(Mg + Fetot)] diorite intrusions from western Shandong in the North China Craton (NCC). Dunite and some harzburgite xenoliths typically preserve areas of orthopyroxenite (sometimes accompanied by phlogopite) either as veins ...
Wenliang Xu +5 more
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Adakitic magmas: modern analogues of Archaean granitoids
Lithos, 1999Both geochemical and experimental petrological research indicate that Archaean continental crust was generated by partial melting of an Archaean tholeiite transformed into a garnet-bearing amphibolite or eclogite. The geodynamic context of tholeiite melting is the subject of controversy.
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Adakites along oceanic transforms?
2003Quaternary dacites and trachytes from the Aird Hills and Lusancay Islands in Papua New Guinea show some of the clearest slab melt geochemical signatures (Mg# 73-93, Sr = 1520-2650 ppm, Sr/Y = 140-445, La/Yb = 135-238), yet there is no slab currently subducting beneath Papua New Guinea.
Haschke, M., Ben-Avraham, Z.
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Island Arc, 2005
Abstract Small‐volume plutons of Early to Late Cretaceous ages are widely distributed in the Yamizo Mountains, central Japan. These plutons consist predominantly of granitoids, classified into hornblende gabbro, quartz diorite, hornblende–biotite granodiorite and coarse‐grained biotite granite.
Yutaka Takahashi +2 more
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Abstract Small‐volume plutons of Early to Late Cretaceous ages are widely distributed in the Yamizo Mountains, central Japan. These plutons consist predominantly of granitoids, classified into hornblende gabbro, quartz diorite, hornblende–biotite granodiorite and coarse‐grained biotite granite.
Yutaka Takahashi +2 more
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Early paleozoic adakites in the eastern sayan: Geochemistry and sources
Geochemistry International, 2010The paper reports data on the geochemistry of Early Paleozoic granitoids in the Munku-Sardyk Range, Eastern Sayan. It has been established that the rocks composing this pluton have compositional characteristics corresponding to the genetically unified association of NEB (Nb-enriched basites) and adakites.
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Distinguishing the garnet signatures in a global database of adakites
Goldschmidt2022 abstracts, 2022Yajie Gao, Hugh O'Neill, John Mavrogenes
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