Results 91 to 100 of about 12,638 (229)

New tectonic discrimination diagrams for basic and ultrabasic volcanic rocks through log-transformed ratios of high field strength elements and implications for petrogenetic processes

open access: yesRevista Mexicana de Ciencias Geológicas, 2018
The statistically correct handling of compositional data requires log-ratio transformation whereas the multivariate technique of linear discriminant analysis (LDA) assumes a normal distribution of the transformed variables.
Surendra P. Verma, Salil Agrawal
doaj  

Ophiolite-Related Ultramafic Rocks (Serpentinites) in the Caribbean Region : a Review of their Occurrence, Composition, Origin, Emplacement and Ni-Laterite Soil Formation [PDF]

open access: yes, 2006
Ultramafic rocks, mainly serpentinized peridotites of mantle origin, are mostly associated with the ophiolites of Mesozoic age that occur in belts along three of the margins of the Caribbean plate. The most extensive exposures are in Cuba. The ultramafic-
Draper, G.   +4 more
core   +4 more sources

Fore-arc ophiolite.

open access: yesJournal of Geography (Chigaku Zasshi), 1989
Recent results of dredging and drilling of inner trench slopes have revealed that the abundant ophiolitic rocks (fore-arc ophiolite) crop out in the Izu-Ogasawara, Mariana, Yap, Tonga, and Middle America regions. These are commonly composed of serpentinized peridotite, gabbro, and volcanics of basic to intermediate composition.The fore-arc ophiolite of
Hirokazu MAEKAWA   +2 more
openaire   +2 more sources

The older ultramafic rocks of Aberdeenshire, similarities to SSZ ophiolites and significance for regional tectonics [abstract] [PDF]

open access: yes, 2008
It has long been known that there are at least two phases of mafic-ultramafic magmatism in NE Scotland (Read 1919), the well known Younger Gabbro suite and a lesser known ‘Older suite’.
Styles, Michael
core  

Masirah – The other Oman ophiolite: A better analogue for mid-ocean ridge processes? [PDF]

open access: yes, 2017
Oman has two ophiolites – the better known late Cretaceous northern Oman (or Semail) ophiolite and the lesser known and smaller, Jurassic Masirah ophiolite located on the eastern coast of the country adjacent to the Indian Ocean.
Anonymous   +57 more
core   +2 more sources

Geochemistry of amphibolites and related graphitic gneisses from the Suchý and Malá Magura Mountains (central Western Carpathians) – evidence for relics of the Variscan ophiolite complex

open access: yesGeologica Carpathica, 2015
Three small bodies of amphibolites and associated graphitic gneisses from the Suchý and Malá Magura Mountains (Tatric Megaunit, central Western Carpathians) have been studied by petrographic and geochemical methods.
Ivan Peter, Méres Štefan
doaj   +1 more source

The Upper Palaeozoic pebbly mudstone facies of peninsular Thailand and western Malaysia - Continental margin deposits of Palaeoeurasia [PDF]

open access: yes, 1986
Die devonische bis unterpermlsche Phuket Group in Thailand und deren Äquivalent in Malaysia, die Singha Formation, gehören zum SE-asiatischen "pebbly mudstone Gürtel", welcher sich vom südlichen Tibet bis Sumatra erstreckt. Diese ca.
Altermann, Wladyslaw
core   +1 more source

Evidence for spreading in the lower Kam Group of the Yellowknife greenstone belt: Implications for Archaean basin evolution in the Slave Province [PDF]

open access: yes
The Yellowknife greenstone belt is the western margin of an Archean turbidite-filled basin bordered on the east by the Cameron River and Beaulieu River volcanic belts (Henderson, 1981; Lambert, 1982). This model implies that rifting was entirely ensialic
Helmstaedt, H., Padgham, W. A.
core   +1 more source

Careón ophiolite, NW Spain: Suprasubduction zone setting for the youngest Rheic Ocean fl oor [PDF]

open access: yes, 2007
The Careón ophiolite (Galicia, NW Iberian Massif) shows lithological and geochemical features suggestive of an origin in a suprasubduction zone setting.
Arenas Martín, Ricardo   +5 more
core   +1 more source

Petrogeochemical characteristics of chrome-bearing ultramafites in the Kurtushibinsky ophiolite belt (Western Sayan)

open access: yesЛитосфера, 2019
Research subject. The metamorphic ultramafites of the Kalninsky and Ergaksky massifs located in the northeastern part of Western Sayan (Russia) constitute the Kurtushibinsky ophiolite belt.
A. I. Chernyshov   +2 more
doaj   +1 more source

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