Results 31 to 40 of about 2,657,206 (280)

Hf–Nd–Pb isotope evidence from Permian arc rocks for the long-term presence of the Indian–Pacific mantle boundary in the SW Pacific [PDF]

, 2007
Trace element and initial Hf-Nd-Pb isotopic composition of a series of late Paleozoic arc rocks from South Island, New Zealand show evidence for the presence of Indian-type mantle in the Permian SW Pacific.
Mezger, K., Nebel, O., Mezger, Klaus, Nebel-Jacobsen, Y., Nebel-Jacobsen, Y.J., Kleine, T., Münker, C., Mortimer, N., Mezger, K   +8 more
core   +1 more source

Impact of chemical treatments on the molecular and stable carbon isotopic composition of sporomorphs [PDF]

Biogeosciences
The stable carbon isotope composition (δ13C) of plants and algae is influenced by environmental factors, such as pCO2, water availability, and altitude.
Y. F. Bats, K. G. J. Nierop, A. Stuart-Lee, J. Frieling, J. Frieling, L. van Roij, G.-J. Reichart, G.-J. Reichart, A. Sluijs   +8 more
doaj   +1 more source

What happened to the Early Precambrian granulite complexes of the Bug region (Ukrainian shield) and the Limpopo belt (South Africa) and how to stratify them? A tectonist’s view

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

Red to Green: A Lipid Biomarker Record of Tonian-Ediacaran Algae in Siberia. [PDF]

Geobiology
ABSTRACT Multiple lines of evidence point to a major diversification of Eukarya in the late Tonian period, ca. 800–720 Ma ago. Regular steranes, lipid biomarkers primarily sourced from eukaryotes, are first unambiguously reported from multiple sites. Here, we present lipid biomarker stratigraphic records from two drill‐cores from the Lena‐Anabar Basin ...
Rizzo AI, Bekker A, Kuznetsov AB, Ershova VB, Xiong Y, Karlstrom KE, Poulton SW, Love GD.   +7 more
europepmc   +2 more sources

Provenance of the Lower Triassic Clastic Rocks in the Southwestern Margin of the South China Craton and Its Implications for the Subduction Polarity of the Paleo-Tethyan Ocean

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, Chao Han, Hu Huang, Hu Huang, Chenchen Yang, Chenchen Yang, Linxi Wang, Linxi Wang, Hongwei Luo, Hongwei Luo   +9 more
doaj   +1 more source

Initial Hf isotope compositions in magmatic zircon from early Proterozoic rocks from the Gawler Craton, Australia: a test for zircon model ages [PDF]

, 2007
We evaluate the validity of age information obtained from two-stage Hf model ages in zircon. Multiple isotope investigations of minerals from the Kiana Granite of the Archean Sleafordian Complex from the southern Gawler Craton, Australia, reveal a ...
Nebel-Jacobsen, Yona, Nebel, O., Mezger, Klaus, Berndt, J., Nebel-Jacobsen, Y., Nebel, Oliver, Nebel-Jacobsen, Y.J., Berndt, J, Mezger, K   +8 more
core   +1 more source

Detrital zircon Hf isotopic compositions indicate a northern Caledonian connection for the Alexander terrane [PDF]

Lithosphere, 2013
Various plate reconstructions predict that the Alexander terrane, a Neoproterozoic-Jurassic crustal fragment now located in the North American Cordillera, evolved in proximity to the northern Appal ...
Luke P. Beranek, Cees R. van Staal, William C. McClelland, Steve Israel, Mitch G. Mihalynuk   +4 more
openaire   +1 more source

Oxygen isotope ecology of recent planktic foraminifera at the central Walvis Ridge (SE Atlantic) [PDF]

, 2005
Above the Walvis Ridge, in the SE Atlantic Ocean, we collected living plantkic foraminifera from the upper water column using depth stratified plantkon tows. The oxygen isotope composition (
Kroon, Dirk, Dick Kroon, Brummer, G.J.A., Neven Lončarić, Brummer, G. J. A., Kroon, D., Peeters, F. J. C., Peeters, F.J.C., Geert‐Jan A. Brummer, Loncaric, N., Frank J. C. Peeters   +10 more
core   +2 more sources

The composition and distribution of the rejuvenated component across the Hawaiian plume: Hf‐Nd‐Sr‐Pb isotope systematics of Kaula lavas and pyroxenite xenoliths

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, Vincent J. M. Salters, Michael O. Garcia, Marc D. Norman   +3 more
doaj   +1 more source

Hafnium isotope composition of zircon from the platinum-bearing Feklistov massif (Shantar Archipelago, Sea of Okhotsk, Russia)

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