Results 21 to 30 of about 4,715 (162)
Геофизический журнал, 2022 The author reviews two alternative approaches (stratigenic-metamorphogenic and deformation-metamorphogenic) to the geology and mapping of the Earth’s oldest crust rocks that were metamorphized in РТ-conditions of the granulite facies, on the examples of
O.B. Gintov
doaj +1 more source
Frontiers in Earth Science, 2022 The southwestern margin of the South China Craton preserves a Late Permian to Early Triassic sedimentary succession, the provenance of which helps to constrain the magmatic history and tectonic evolution of the Paleo-Tethyan Orogen.
Chao Han +9 more
doaj +1 more source
Chinese Science Bulletin, 2003 In the peralumineous granite of Yajiangqiao zircon population can be divided into two groups (i.e. Zircon I and Zircon II), which were formed in magmatic chamber and in emplacement place, respectively. The Hf isotope compositions of two stages of zircon show that the host magma was essentially derived from crustal material by melting.
Xiang Wang +3 more
openaire +2 more sources
Geochemistry, Geophysics, Geosystems, 2013 Rejuvenated volcanism refers to the reemergence of volcanism after a hiatus of 0.5–2 Ma following the voluminous shield building stage of Hawaiian volcanoes.
Michael Bizimis +3 more
doaj +1 more source
Литосфера, 2018 Object. This study firstly evaluates Hf-isotope characteristics of zircons from wehrlite of the platinum-bearing Feklistov massif, which is closely associated with platinum coastal placer deposits. Materials and methods.
Kreshimir N. Malitch, Inna Yu. Badanina
doaj +1 more source
Anais da Academia Brasileira de Ciências, 2021 Collisional granites of the Araçuaí Orogen, southeastern Brazil, record petrological and geochronological evidence for multiple crustal melting during the orogeny evolution. U-Pb zircon data indicate that these granites crystallized at 586 ± 2 M.y.
SANDRO MAURI +3 more
doaj +1 more source
Beach placer, a proxy for the average Nd and Hf isotopic composition of a continental area
Chemical Geology, 2011 Beach placer deposits concentrate detrital heavy minerals which are the erosion products of large areas of continental crust. Here, we report the first analyses of Nd-Hf isotopic ratios and trace element concentrations that we measured in a beach placer from Camargue, France and in its pure mineral separates. Both the bulk composition of the placer and
Garçon, Marion +2 more
openaire +2 more sources
Hf isotopic compositions of the Hawaii Scientific Drilling Project Core and the source mineralogy of Hawaiian basalts [PDF]
Geophysical Research Letters, 1999 A large suite of Mauna Kea basalts from the Hawaii Scientific Drilling Project core show a progressive enrichment in radiogenic Hf with time (ϵHf = +11.4 to +13.1) well‐correlated with the increasingly radiogenic character of Nd. The alkali basalts erupted at the termination of the Mauna Kea stage are isotopically indistinguishable from the underlying ...
Janne Blichert‐Toft, Francis Albarède
openaire +1 more source
Geochemistry, Geophysics, Geosystems, 2018 The Hawaiian‐Emperor chain is the ∼6,000 km long surface expression of the deeply sourced Hawaiian mantle plume active over the past ∼81 Myr. The Hawaiian Islands (81–47 Ma) show only Kea compositions.
L. N. Harrison, D. Weis
doaj +1 more source
China Geology, 2018 : The Truong Son Fold Belt, located at the northeastern margin of the Indochina Block, is considered to be tectonically linked to the subduction of the Paleotethys Ocean and subsequent collision. Sepon is one of the most important super large deposits of
Xin-yu Wang +4 more
doaj +1 more source