Results 51 to 60 of about 298,753 (226)

Coeval interaction between magmas of contrasting composition (Late Carboniferous-Early Permian Santa Eulália-Monforte massif, Ossa-Morena Zone): field relationships and geochronological constraints

open access: yesGeologica Acta, 2017
The Santa Eulália-Monforte massif is a post-kinematic Late Carboniferous-Early Permian calc-alkaline composite massif (LC-EP) located in the Ossa-Morena Zone (OMZ, Portugal).
M.F. PEREIRA, C. GAMA, C. RODRÍGUEZ
doaj  

A Geochemical Overview of Mid-Archaean Metavolcanic Rocks from Southwest Greenland

open access: yesGeosciences, 2018
The present contribution reviews bulk-rock geochemical data for mid-Archaean (ca. 3075–2840 Ma) metavolcanic rocks from the North Atlantic Craton of southwest Greenland.
Kristoffer Szilas
doaj   +1 more source

Intercomparison of carbon‐13 and carbon‐14 tracer approaches for estimating marine calcification and net primary production

open access: yesLimnology and Oceanography: Methods, EarlyView.
Abstract Accurate measurements of phytoplankton net primary production (NPP) and calcification are essential for quantifying marine carbon cycling, yet in situ calcification rates remain poorly constrained. We compared 13C‐ and 14C‐based tracer methods for NPP in laboratory cultures of the diatom Chaetoceros tenuissimus and the coccolithophore ...
Chloe L. Smith   +4 more
wiley   +1 more source

Relatório final

open access: yes, 2011
CALC ...
CALC, ALADI
core   +1 more source

Petrology and geochemistry of volcanic and subvolcanic rocks in the south of Asagi igneous complex, northwest of Zahedan, Sistan Suture Zone [PDF]

open access: yesپترولوژی
IntroductionThe Asagi igneous complex is located in the northwest of Zahedan city (Figure 1A) and is part of a southeast–northwest trending magmatic belt. The igneous rocks of this belt were formed during at least two distinct periods.
Mohammad Bameri   +2 more
doaj   +1 more source

Petrogenisis of Mafic- intermediate Magmatism, East of Sanandaj; A New approach with careful monitoring of geochemical evidences [PDF]

open access: yesپترولوژی, 2019
The East Sanadaj magmatic rocks of the northern Sanandaj-Sirjan Zone, part of Zagros Orogen, comprise several intrusive bodies that were generated during northeastward subduction of Neo-tethys beneath the Iranian sector of the Eurasian plate.
Sanaz Yajam
doaj   +1 more source

Analysis of Carbohydrates and Glycoconjugates by Matrix‐Assisted Laser Desorption/Ionization Mass Spectrometry: An Update for 2023–2024

open access: yesMass Spectrometry Reviews, EarlyView.
ABSTRACT The use of MALDI mass spectrometry for the analysis of carbohydrates and glycoconjugates is a well‐established technique and this comprehensive review is the twelfth update of the original article published in 1999 and brings coverage of the literature to the end of 2024.
David J. Harvey
wiley   +1 more source

Contemporaneous late cretaceous calc-alkaline and alkaline magmatism in Central Anatolia, Turkey: oxygen isotope constraints on petrogenesis

open access: yes, 2009
A wide variety of rock types were produced by the latest Cretaceous magmatism in the Central Anatolian Crystalline Complex. These rocks can be divided into three distinct units: (i) calc-alkaline, (ii) subalkaline/transitional, and (iii) alkaline.
Meighan, I.G.   +13 more
core   +1 more source

Lithogeochemical and Nd-Sr isotope data of the orthogranulites of the Juiz de Fora complex, SE-Brazil: insights from a hidden Rhyacian Orogen within the Ribeira belt

open access: yesBrazilian Journal of Geology, 2019
New petrography, geochemistry and Sm-Nd and Sr data from the orthogranulites of the Juiz de Fora complex in southern Rio de Janeiro State and compiled information provide insights on the petrogenetic and tectonic evolution.
Lucas Eduardo de Abreu Barbosa Araujo   +4 more
doaj   +1 more source

Deuterium Quadrupolar Coupling Constants for Characterization of Hydrogen Ligands in Transition Metal Hydride Complexes: A Review

open access: yesMagnetic Resonance in Chemistry, EarlyView.
An overview of the 2H NMR application shows how to use the DQCC values in metal–hydrogen systems for characterization of metal–hydrogen bonding modes in transition metal hydride complexes, metal–hydrogen alloys, metal nanoparticles, and immobilized metal hydrides.
Vladimir I. Bakhmutov
wiley   +1 more source

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