Results 1 to 10 of about 355,389 (181)

Early onset of aridity in the past millennium: Insights from vegetation dynamics and climate change in the alpine, cold-desert region of Trans Himalaya, India. [PDF]

open access: yesPLoS ONE
Palynological analysis of surface soil and sub-surface sediments from the outwash plain of Hamtah Glacier, Lahaul-Spiti, India, has brought out the vegetation and climatic changes in the area during the last 1580 years.
Ruchika B Mohanty   +6 more
doaj   +2 more sources

Evaluating the Compatibility of Hematite (U‐Th)/He Data and Hematite‐Carried Secondary Magnetizations: An Example From the Colorado Front Range

open access: yesGeochemistry Geophysics Geosystems, 2023
Ancient magnetization(s), often recorded by hematite (Fe2O3), provide key paleomagnetic constraints on plate interactions through time. Primary remanent magnetizations may be modified or overprinted by secondary processes that complicate interpretations ...
J. Jensen, A. Ault, J. Geissman
semanticscholar   +1 more source

Petrology and geochemistry of Plio-Quaternary high-Nb basalts from Shahr-e-Babak area:Insights into post-collision magmatic processes in the Kerman Cenozoic Magmatic Arc

open access: yesGeologica Acta, 2022
Post-collision Pliocene-Quaternary basaltic rocks outcrop in the Kerman Cenozoic Magmatic Arc (KCMA) to the northwest and east of Shahr-e-Babak city. These porphyritic and vesicular basaltic rocks are composed essentially of clinopyroxene, olivine, and ...
Sakine Moradi   +3 more
semanticscholar   +1 more source

Interlaboratory comparison of electron probe microanalysis of Interlaboratory comparison of electron probe microanalysis of glass geochemistry glass geochemistry

open access: yes, 2021
Tephrochronology commonly relies upon grain-discrete analysis of glass shards to reveal the subtle geochemical differ- ences between tephras from past explosive volcanic eruptions.
J. Hunt   +4 more
semanticscholar   +1 more source

Simple Stochastic Modeling of Snowball Probability Throughout Earth History [PDF]

open access: yes, 2022
Over its multibillion-year history, Earth has exhibited a wide range of climates. Its history ranges from snowball episodes where the surface was mostly or entirely covered by ice to periods much warmer than today, where the cryosphere was virtually absent.
arxiv   +1 more source

The original examples of lanthanide tetrad effect in solvent extraction: A new interpretation compatible with recent progress in REE geochemistry.

open access: yesGEOCHEMICAL JOURNAL, 2001
Geochmeical studies reporting lanthanide tetrad effects in natural samples often cite the original examples of tetrad effect depicted by log Kd(org/aq) for Ln(III) in the two solvent-extraction systems (Peppard et al., 1969) and its theoretical interpretation (Jorgensen, 1970; Nugent, 1970).
Akimasa Masuda, Iwao Kawabe
openaire   +3 more sources

The Generic Mapping Tools Version 6

open access: yesGeochemistry Geophysics Geosystems, 2019
The Generic Mapping Tools (GMT) software is ubiquitous in the Earth and ocean sciences. As a cross‐platform tool producing high‐quality maps and figures, it is used by tens of thousands of scientists around the world.
P. Wessel   +6 more
semanticscholar   +1 more source

Cost-Effective Cementitious Material Compatible with Yucca Mountain Repository Geochemistry [PDF]

open access: yes, 2004
The current plans for the Yucca Mountain (YM) repository project (YMP) use steel structures to stabilize the disposal drifts and connecting tunnels that are collectively over 100 kilometers in length. The potential exist to reduce the underground construction cost by 100s of millions of dollars and improve the repository's performance.
openaire   +3 more sources

Geochemistry of Ocean Floor and Fore-arc Serpentinites: Constraints on the Ultramafic Input to Subduction Zones

open access: yes, 2012
Free to read at publisher's site. We provide new insights into the geochemistry of serpentinites from mid-ocean ridges (Mid-Atlantic Ridge and Hess Deep), passive margins (Iberia Abyssal Plain and Newfoundland) and fore-arcs (Mariana and Guatemala) based
J. Kodolányi   +4 more
semanticscholar   +1 more source

Timing and Provenance of Volcanic Fluxes Around the Permian‐Triassic Boundary Mass Extinction in South China: U‐Pb Zircon Geochronology, Volcanic Ash Geochemistry and Mercury Isotopes

open access: yesGeochemistry Geophysics Geosystems, 2023
Anomalous mercury (Hg) contents recorded near the Permian‐Triassic boundary (PTB) are often linked to Siberian Traps Large Igneous Province (STLIP) volcanism and the Permian‐Triassic boundary mass extinction (PTBME).
O. Edward   +7 more
semanticscholar   +1 more source

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