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Mostrando ítems 11-20 de 102
Emerald from the Fazenda Bonfim Deposit, northeastern Brazil: chemical, fluid inclusions and oxygen isotope data
(Sociedade Brasileira de Geologia, 2019)
HETEROGENEITIES OF SUBCONTINENTAL LITHOSPHERIC MANTLE AT THE SOUTHERNMOST OF SOUTH-AMERICAN PLATE: INFLUENCE OF PRESENT SUBDUCTION AND LITHOSPHERE-ASTENOSPHERE INTERACTIONS UNDER THE PALI AIKE VOLCANIC FIELDHeterogeneidades do Manto Litosférico Subcontinental ao extremo Sul da Placa Sul-Americana: influência da subducção atual e interações litosfera-astenosfera sob o Campo Vulcânico de Pali Aike
(Instituto de Geociências /Universidade Federal do Rio Grande do Sul, 2012)
Slab-derived components in the subcontinental lithospheric mantle beneath Chilean Patagonia: Geochemistry and Sr–Nd–Pb isotopes of mantle xenoliths and host basalt
(Elsevier Science, 2017-11)
In subduction zones, ultramafic xenoliths hosted in alkaline basalts can yield significant information about the role of potential slab-derived components in the subcontinental lithospheric mantle (SCLM). Chemical and ...
Potassic-ultrapotassic mafic rocks delineate two lithospheric mantle blocks beneath the southern Peruvian Altiplano
(Geological Society of AmericaUS, 2005-07)
The Altiplano of southern Peru displays a large spectrum of Cenozoic potassic (K) and ultrapotassic (UK) mafic rocks that delineate two deep lithospheric mantle blocks that have undergone different depletion and enrichment ...
Potassium Metasomatism Of Precambrian Paleosols
(Elsevier, 2015)
Noble gas composition of subcontinental lithospheric mantle: An extensively degassed reservoir beneath Southern Patagonia
(Elsevier Science, 2016-07)
Patagonia, in the Southern Andes, is one of the few locations where interactions between the oceanic and continental lithosphere can be studied due to subduction of an active spreading ridge beneath the continent. In order ...
Geochemistry and petrogenesis of sanukitoids and high-K anatectic granites from the Bundelkhand Craton, India: Implications for late-Archean crustal evolution
(Pergamon-Elsevier Science Ltd, 2019-05-01)
In this paper, we present in situ zircon U–Pb ages as well as whole-rock elemental and Sm-Nd isotopic compositions for late Archean sanukitoids of the Bundelkhand Craton, India. The LA–ICP–MS zircon U–Pb dating results of ...
Compositional variations of syntectonic white-mica in low-grade ignimbritic mylonite
(JOURNAL OF STRUCTURAL GEOLOGY, 2005)
The Silla del Gobernador Shear Zone (SGSZ), Coastal Range of central Chile (32 degrees S), is a low-grade mylonite generated from a Triassic acidic ignimbritic protolith. Different microstructures (e.g. quarter mats and ...
Alkaline lavas in the volcanic front of the Western Mexican Volcanic Belt: Geology and petrology of th Ayutla and Tapalpa volcanic fields
(2001)
The Plio-Quaternary Ayutla and Tapalpa volcanic fields in the volcanic front of the western Mexican Volcanic Belt (WMVB) contain a wide variety of alkaline volcanic rocks, rather than only calc-alkaline rocks as found in ...