Results 171 to 180 of about 859 (200)
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Origin of adakite-like plutons in southern Korea
Lithos, 2016Abstract We present Sr–Nd–Pb isotopic compositions for two adakite-like intrusions in southern Korea (Jindong and Bongnae), including major and trace element concentrations, and the sensitive high-resolution ion microprobe (SHRIMP) zircon U–Pb age. Our aim is to constrain the origin and tectonomagmatic processes that gave rise to the plutons.
Jeong-Im Oh, Sung Hi Choi, Keewook Yi
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Gondwana Research, 2017
Abstract Post-collisional adakitic rocks (26–9 Ma) have been recognized in southern Tibet for almost 20 years; however, their origins and geodynamics remain highly controversial. This paper reports geochronological and geochemical data for the Lasa intrusion exposed in the Zhongba terrane and proposes implications for the origins of the Miocene ...
Yalin Li +7 more
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Abstract Post-collisional adakitic rocks (26–9 Ma) have been recognized in southern Tibet for almost 20 years; however, their origins and geodynamics remain highly controversial. This paper reports geochronological and geochemical data for the Lasa intrusion exposed in the Zhongba terrane and proposes implications for the origins of the Miocene ...
Yalin Li +7 more
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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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Adakites From Solander Island, New Zealand
New Zealand Journal of Geology, and Geophysics, 1997Abstract The subduction related, island arc Pleistocene volcano of Solander Island in Foveaux Strait is composed of adakite, a new rock type first described from Adak Island in the Aleutian arc. Adakites are formed by the partial fusion of young oceanic crust under eclogitic facies conditions.
A. Reay, D. Parkinson
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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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Crustal thickness and adakite occurrence in the Philippines: Is there a relationship?
Island Arc, 2008AbstractAdakites are increasingly being recognized worldwide in a variety of tectonic settings. Models on the formation of this geochemically distinct class of volcanic rocks have evolved from partial melting of subducted young, hot oceanic slabs to magmatism resulting from oblique subduction, low‐angle or flat subduction, or even slab‐tearing.
Carla B. Dimalanta +1 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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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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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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