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The 1650–1540 Ma rapakivi granites and associated basic rocks (e.g. gabbro–anorthosites) in southern Finland intrude the local juvenile Paleoproterozoic crust with little isotopic contrast to the contemporary mantle. Conventional isotopic studies have not been able to provide a satisfactory...
Paleogene mafic potassic and ultrapotassic volcanic rocks in western Yunnan, China, show a compositional spectrum from potassic trachybasalt to latite (MgO = 6·24–21·8 wt %; SiO 2 = 44·5–59·1 wt %). These rocks have high K 2 O (3·07–5·28 wt %), relatively low Na 2 O (0·99–4·18 wt...
Subduction zone magmas are characterized by high concentrations of pre-eruptive H 2 O, presumably as a result of an H 2 O flux originating from the dehydrating, subducting slab. The extent of mantle melting increases as a function of increasing water content beneath back-arc basins and is...
We present an investigation of B–Be– 10 Be–ϵNd systematics of the incoming crust and across the wide, active Kurile arc in the NW Pacific ocean basin to address the role of recent sediment incorporation in arc magmas as a function of depth to the Wadati–Benioff zone. The 10 Be flux ratio...
The 37 ± 1 Ma breccia-hosted porphyry Mo(–Nb) deposit at Cave Peak is genetically related to a mafic, alkaline intrusion nearby (the Marble Canyon Stock), thus providing an excellent opportunity to study the influence of mafic magmatism on porphyry Mo formation. Laser ablation inductively...
St. Vincent and Grenada, known for the presence of high Mg-basalts, are two of the southernmost islands of the Lesser Antilles arc, located at the boundary between the Atlantic and Caribbean Plates. We report here secondary ionization mass spectrometry measurements of trace elements (V, Sr, Y,...
The Tamazert Eocene alkaline complex of the Central High Atlas Range of Morocco hosts the largest outcropping occurrences of carbonatites in northern Africa. The complex consists of carbonatites and undersaturated ultramafic to syenitic alkaline to peralkaline silicate rocks. Mineralogically and...
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