Results 71 to 80 of about 5,717 (242)
Table_1_Characterization of Nd Radiogenic Isotope Signatures in Sediments From the Southwestern Atlantic Margin.XLSX [PDF]
, 2018 Based on radiogenic isotope systems of neodymium [Epsilon Neodymium-εNd(0), 143Nd/144Nd, 147Sm/144Nd, and Sm-Nd Depleted Mantle Model ages-TDM] from current and previous data of continental rocks and associated sediments, this work provides the ...
Colombo C. G. Tassinari (5392412) +4 more
core +1 more source
Meteoritics &Planetary Science, EarlyView.Abstract Volatile‐rich xenolithic clasts in different types of brecciated meteorites represent unique pristine solar system material. This study investigates the maturity and thermal history of organic matter using Raman spectroscopy and aqueous alteration effects using infrared spectroscopy in the matrix of 15 volatile‐rich clasts (C1 and CM‐like ...
Swarna Prava Das +7 more
wiley +1 more source
Journal of Economic Geology, 2012 Tertiary intrusive granitoids within the Lut block in the Khorasan Razavi and South Khorasan provinces are mainly sub-volcanic with porphyry texture and their composition varies from granite to diorite but monzonite is dominant.
Mohammad Hassan Karimpour +3 more
doaj +3 more sources
Monogenetic Near‐Island Seamounts in the Galápagos Archipelago
Geochemistry, Geophysics, Geosystems, 2020 Rarely have small seamounts on the flanks of hotspot derived ocean‐island volcanoes been the targets of sampling, due to sparse high‐resolution mapping near ocean islands.
D. M. Schwartz +4 more
doaj +1 more source
Geophysical Research Letters, 2023 In the southwest Japan forearc, slab‐fluids produced from subducted materials migrate to crustal levels and appear as deep‐seated brine. We have analyzed for the first‐time stable strontium isotopes in non‐volcanic spring water with high salinity ...
T. Kani +6 more
doaj +1 more source
Radiogenic isotopes document the start of subduction in the Western Pacific [PDF]
Earth and Planetary Science Letters, 2019 Subduction initiation is one of the least understood aspects of plate tectonics. In an effort to obtain the first in situ magmatic record of subduction initiation, the International Ocean Discovery Program Expedition 352 drilled at four sites in the inner trench wall of the Bonin Trench to recover 1.22 km of oceanic upper crust accreted within a few m ...
Hong-Yan Li +8 more
openaire +2 more sources
Meteoritics &Planetary Science, EarlyView.Abstract The Ames impact structure (Oklahoma) is thought to have formed during the Ordovician Meteor Event, based on conodont biostratigraphy of its crater fill. Here, U–Pb zircon dates from its impact‐melt portion, conducted using secondary ion mass spectrometry and laser ablation–inductively coupled plasma–mass spectrometry (n = 37 spots), yield a ...
Elizabeth J. Catlos +9 more
wiley +1 more source
The palaeoenvironmental potential of bioarchaeological isotope data
Communications Earth & EnvironmentBioarchaeology not only provides insights into human, animal, and environmental ecology, but also generates huge amounts of stable and radiogenic isotope data that are not well recognised by other disciplines.
Margaux L. C. Depaermentier +9 more
doaj +1 more source
The role of crustal and mantle sources in the genesis of granitoids of the Antarctic Peninsula and adjacent crustal blocks [PDF]
, 2001 Magmatic rocks from the Antarctic Peninsula show marked variations in isotope composition, which reflect changes in the geodynamic evolution of the peninsula through time. Most Antarctic Peninsula granitoids formed as a result of subduction: they fall on
Millar, I.L. +3 more
core
Potassium isotopic compositions and exposure ages of evolved and silica‐rich achondrites
Meteoritics &Planetary Science, EarlyView.Abstract Some of the oldest igneous rocks in the Solar System include evolved and silica‐rich achondrites that originate from parent bodies less than 1000 km in diameter, referred to as planetesimals. While Earth was initially in a molten state and required continental crust formation and plate tectonics to generate andesite bulk compositions, evolved ...
Z. Vaci +9 more
wiley +1 more source