Results 81 to 90 of about 724,346 (300)

Arctic Tectonics and Volcanism: a multi-scale, multi-disciplinary educational approach [PDF]

open access: yesGeoscience Communication
Geologically, the Arctic is one of the least-explored regions of Earth. Obtaining data in the high Arctic is logistically, economically, and environmentally expensive, but the township of Longyearbyen (population of 2617 as of 2024) at 78° N represents a
K. Senger   +27 more
doaj   +1 more source

The Geology of New Guinea - The Cordilleran Margin of the Australian Continent

open access: yes, 2012
The island of New Guinea is the mountainous margin of the Australian continent. Paleozoic and Proterozoic Australian craton extends northward beneath the shallow waters of the Arafura Sea to underlie the southern plains of New Guinea and, with overlying ...
H. Davies
semanticscholar   +1 more source

Zircon (Re)crystallization During Metamorphism: Zircon Paragenesis in the Papua New Guinea Coesite Eclogite Revisited

open access: yesJournal of Metamorphic Geology, EarlyView.
ABSTRACT The youngest known ultrahigh‐pressure (UHP) eclogite from Tumagabuna Island, a small island of the D'Entrecasteaux Islands chain in Papua New Guinea, exhibits zircon U–Pb age variations spanning a few million years. This age variation complicates the interpretation of the evolution of this high and ultrahigh‐pressure ([U]HP) terrane.
Linus B. Streicher   +4 more
wiley   +1 more source

Carbon depth cycle and formation of abiogenic hydrocarbons

open access: yesИзвестия Томского политехнического университета: Инжиниринг георесурсов, 2018
The relevance. Identification of mechanisms of carbon metamorphic transformation in convergent and divergent regions of the Earth, assessment of the scale of deep transport and the transfer on the generation of abiogenic hydrocarbons in tectonic ...
Nickolay O. Sorokhtin   +2 more
doaj   +2 more sources

Episodic Lithospheric Deformation in Eastern Tibet Inferred From Seismic Anisotropy

open access: yesGeophysical Research Letters, 2020
Mechanisms for uplift and deformation of the Tibetan Plateau remain vigorously debated; hypotheses include stepwise growth, distributed thickening, and crustal channel flow, each with a distinct anisotropic signature.
Xuewei Bao   +4 more
doaj   +1 more source

Mid‐infrared detection and characterization of refractory inclusions in CM and CO chondrites: A non‐destructive approach for returned space samples

open access: yesMeteoritics &Planetary Science, Volume 60, Issue 3, Page 544-569, March 2025.
Abstract Refractory inclusions (RIs) in chondrites are widely used as tracers of early solar system formation conditions. In the context of sample‐return missions, a non‐destructive and non‐invasive analytical tool that can rapidly detect and characterize RIs in space samples during their early phase of study is highly needed.
Jean Charlier   +4 more
wiley   +1 more source

Recent Advances in Understanding the Geology of Diamonds

open access: yes, 2013
It has been more than two decades since diamond ages have proven to be up to billions of years older than their host magmas of kimberlite or lamproite.
S. Shirey, J. Shigley
semanticscholar   +1 more source

Selective sampling of asteroids, the Moon, and Mars: Factors affecting the numerical abundances of members of meteorite groups

open access: yesMeteoritics &Planetary Science, EarlyView.
Abstract Meteorite collection inventories show that many related meteorite groups have very different numerical abundances (e.g., lunar versus Martian meteorites; Eagle Station pallasites versus main‐group pallasites; eucrites versus diogenites; ungrouped Antarctic irons versus ungrouped non‐Antarctic irons; carbonaceous chondrite‐related (CC) iron ...
Alan E. Rubin
wiley   +1 more source

Olivine–gabbroic shergottites: A petrogenetic link between poikilitic and gabbroic shergottites

open access: yesMeteoritics &Planetary Science, EarlyView.
Abstract Shergottites span a textural, mineralogical, and geochemical range, and finding links between the various petrologic and geochemical groups is of great interest as it provides insight into the conditions of the Martian interior. Here, we compare the texture, mineralogy, mineral chemistry, and geochemistry of REE‐enriched intrusive shergottite ...
S. Benaroya, J. Gross
wiley   +1 more source

Geochemistry of basalts in unravelling the mantle processes and crustal evolution: Insights from the greenstone belts of western Dharwar Craton

open access: yesGeosystems and Geoenvironment, 2022
Basalts are an integral part of all the greenstone belts of Dharwar Craton which played a vital role in the thermo-tectonic evolution and mantle processes during the Archean time.
C. Manikyamba   +4 more
doaj  

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