A study of rare earth element (REE)–SiO2 variations in felsic liquids generated by basalt fractionation and amphibolite melting: a potential test for discriminating between the two different processes

Brophy, James G.

doi:10.1007/s00410-008-0289-x

Cited by 136 publications

(73 citation statements)

References 64 publications

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“…The trends displayed are typical of POAM -Plagioclase, olivine (and/or orthopyroxene), clinopyroxene (and/or amphibole) and magnetite fractionation; such fractionation is typical in arc suites for the formation of andesitic compositions from mafic parent melts (Gill, 1981). According to the REE modeling of Brophy (2008), the slightly increasing LREE and constant HREE at intermediate compositions are compatible with amphibole-present basalt fractionation in the lower crust, and the enrichment in all REE at high silica content is compatible with mid-to upper-crustal fractionation of basalt where amphibole is not present.…”

Section: Petrogenesismentioning

confidence: 95%

Sedimentary recycling in arc magmas: geochemical and U–Pb–Hf–O constraints on the Mesoproterozoic Suldal Arc, SW Norway

Roberts

Slagstad

Parrish

et al. 2012

Contrib Mineral Petrol

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The Hardangervidda-Rogaland Block within southwest Norway is host to ~1.52-1.48 Ga continental building, and variable reworking during the ~1.1-0.9 Ga Sveconorwegian orogeny. Due to the lack of geochronological and geochemical data, the timing and tectonic setting of early Mesoproterozoic magmatism has long been ambiguous. This paper presents zircon U-Pb-Hf-O isotope data combined with whole-rock geochemistry to address the age and petrogenesis of basement units within the Suldal region, located in the centre of the Hardangervidda-Rogaland Block. The basement comprises variably deformed grey gneisses and granitoids that petrologically and geochemically resemble mature volcanic arc lithologies.U-Pb ages confirm that magmatism occurred from ~1521 to 1485 Ma, and conspicuously lack any xenocrystic inheritance of distinctly older crust. Hafnium isotope data range from εHf (initial) +1 to +11, suggesting a rather juvenile magmatic source, but with possible involvement of late Palaeoproterozoic crust. Oxygen isotope data range from mantle-like (δ 18 O ~5‰) to elevated (~10‰) suggesting involvement of low-temperature altered material (e.g. supracrustal rocks) in the magma source. The Hf-O isotope array is compatible with mixing between mantle-derived material with young low-temperature altered material (oceanic crust/sediments) and older low-temperature altered material (continent-derived sediments). This, combined with a lack of xenoliths and xenocrysts, exposed older crust, AFC trends and S-type geochemistry, all point to mixing within a deep-crustal magma-generation zone. A proposed model comprises accretion of altered oceanic crust and the overlying sediments to a pre-existing continental margin, underthrusting to the magma generation zone, and remobilisation during arc magmatism. The geodynamic setting for this arc magmatism is comparable to that seen in the Phanerozoic (e.g. the Sierra Nevada and Coast ranges batholiths), with compositions in the Suldal Sector reaching those of average upper continental crust. As within these younger examples, factors that drive magmatism towards the composition of the average continental crust include the addition of sedimentary material to magma source regions, and delamination of cumulate material. Underthrusting of sedimentary materials and their subsequent involvement in arc magmatism is perhaps a more widespread mechanism involved in continental growth than is currently recognized. Finally, the Suldal Arc magmatism represents a significant juvenile crustal addition to SW Fennoscandia.

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Section: Petrogenesismentioning

confidence: 95%

Sedimentary recycling in arc magmas: geochemical and U–Pb–Hf–O constraints on the Mesoproterozoic Suldal Arc, SW Norway

Roberts

Slagstad

Parrish

et al. 2012

Contrib Mineral Petrol

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“…This also yields a progressive HREE enrichment from ultramafic units to the basaltic volcanics as observed in other systems (Brophy, 2008). The high spatial correlation between soil ar-Zr and ar-HREEs indicates a significant contribution by zircon or secondary Zr-bearing phases in the soils.…”

Section: Primary Controls On Ree Distributionsmentioning

confidence: 87%

Reflections of the geological characteristics of Cyprus in soil rare earth element patterns

Ren

Cohen

Rutherford

et al. 2015

Applied Geochemistry

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“…7; 12 -ксенолиты «черных пироксенитов». Использованы материалы: для А - [22], для Б - [21], для В - [29], для Г - [5].…”

Section: два типа адакитов на камчатке и особенности их происхожденияunclassified

Adakite Volcanism at the Continental Margin and Associated Problems. Part 1. Adakites From the Upper Reaches of the Valovayam River. New Age and Material Characteristics, Petrological Modeling

Колосков¹,

Seismology²,

Коваленко³

et al. 2018

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2ФГБУН Институт геологии рудных месторождений, петрографии, минералогии и геохимии РАН, Старомонетный пер. 35, г. Москва, 111901; e-mail: Dmitry@igem.ru Поступила в редакцию 20 марта 2017 г.Представлены новые возрастные и петролого-геохимические материалы по составу пород р-на р. Валоваям (Камчатский перешеек) и некоторых районов Срединного хребта Камчатки (Орловский вулкан, г. Поло-винная, г. Столбовая, г. Матера). Анализ полученных материалов свидетельствует, что пространственное и временное сочетание проявлений внутриплитного и островодужного вулканизма в р-не Валоваям не является случайным, а может быть следствием плавления одного и того же источника с участием ман-тийного диапира. Привлечение данных по составу мантийных ксенолитов и следов их плавления в виде остаточных стекол позволило связать в единый процесс образование пород с различными сериальными признаками. Предложена двустадийная модель петрогенезиса: образование «черных пироксенитов» как результат плавления мантийных лерцолитов и возникновение всего комплекса пород как следствие плавления тех же лерцолитов и новообразованных пироксенитов. Совместное рассмотрение близких по возрасту пород р-на Валоваям и Срединного хребта позволило выявить два типа адакитов: высоко-кремнеземистых в первом регионе и низкокремнеземистых во втором. Появление адакитов первого типа связывается с фракционированием, плавлением и распадом амфибола, второго типа -с фракциониро-ванием и плавлением пироксена.Ключевые слова: адакитовый вулканизм, петрология, моделирование, амфиболы, фракциониро-вание, плавление, распад, Камчатский перешеек, Срединный хребет.

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A study of rare earth element (REE)–SiO2 variations in felsic liquids generated by basalt fractionation and amphibolite melting: a potential test for discriminating between the two different processes

Cited by 136 publications

References 64 publications

Sedimentary recycling in arc magmas: geochemical and U–Pb–Hf–O constraints on the Mesoproterozoic Suldal Arc, SW Norway

Sedimentary recycling in arc magmas: geochemical and U–Pb–Hf–O constraints on the Mesoproterozoic Suldal Arc, SW Norway

Reflections of the geological characteristics of Cyprus in soil rare earth element patterns

Adakite Volcanism at the Continental Margin and Associated Problems. Part 1. Adakites From the Upper Reaches of the Valovayam River. New Age and Material Characteristics, Petrological Modeling

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