Consulta: subjectFacets:"Magmatism"
Registros recuperados: 2
Data/hora: 12/06/2024 05:37:46

Structural controls on polyphase hydrothermal dolomitization in the Kinta Valley, Malaysia: Paragenesis and regional tectono-magmatism
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Ramkumar, Mu; Siddiqui, Numair Ahmed; Mathew, Manoj; Sautter, Benjamin; Hui, Poon Xin; Nagarajan, R.; Breitfeld, H. Tim; Santosh, M.; Menier, David; Poppelreiter, Michael.
In the eastern side of the Malay Peninsula, thick successions of limestone formations preserve important records of the Mesozoic and Cenozoic tectonic events. Here we investigate the strata- and fracture-bound hydrothermal dolomites in the Palaeozoic carbonates of the Kinta Valley, western Peninsular Malaysia. Based on their textural and morphologic characteristics, structural relationships with the host rock, different facies types, and associations with hydrothermal calcite and low-grade metamorphic marble, we attempt to trace their polyphase origin and relationship with thereto-tectonic events of the region. A detailed evaluation of the nature of brecciation and crystallization of polyphase dolomites, dolomitic limestones, limestones and marble, under...
Tipo: Text
Palavras-chave: Hydrothermal dolomite; Tectonics; Magmatism; Paragenesis; Structural evolution; Malaysia.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00637/74938/83485.pdf

Age, geochemical characteristics and petrogenesis of Cenozoic intraplate alkaline volcanic rocks in the Bafang region, West Cameroon
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Ngongang, Nicaise Blaise Tchuimegnie; Kamgang, Pierre; Chazot, Gilles; Agranier, Arnaud; Bellon, Herve; Nonnotte, Philippe.
The origin of the volcanism in the Cameroon Volcanic Line and the nature of its mantle sources are still highly controversial. We present major and trace element compositions as well as Sr-Nd-Pb-Hf isotopic results on mafic and intermediate lavas from the Bafang area in the central part of the Cameroon Volcanic Line. The lavas range from basanites and basalts to hawaiites and mugearites with an alkaline affinity and were emplaced between 10 and 6 Ma ago. The evolution from basalts and basanites to more differentiated rocks involved fractionation of olivine, clinopyroxene and Fe-Ti oxides, but the isotopic compositions show that crustal contamination processes affected some magmas during their ascent in the crust. Basalts and basanites originated from a...
Tipo: Text
Palavras-chave: Cameroon Volcanic Line; Geochemistry; Magmatism; Mantle source.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00221/33255/32158.pdf