Results 71 to 80 of about 6,856 (206)

Beyond Oxygen Fugacity: A Compositional Metric to Probe Earth's Redox Structure

Geophysical Research Letters, Volume 52, Issue 24, 28 December 2025.
Abstract We quantify the redox capacity (dO2) by redox titration—defined as the quantity of oxygen required to fully oxidize a sample—for rocks spanning Earth's upper mantle to surface sediments. The values span three orders of magnitude, with the greatest variability in metamorphic and surface rocks that host both highly reduced (rich in carbon and ...
Matthieu Emmanuel Galvez, Othmar Müntener, Samuel Laurent Jaccard   +2 more
wiley   +1 more source

Mineralogy and composition of Archean Crust, Greenland: A pilot study [PDF]

The Portable Instant Display and Analysis Spectrometer (PIDAS) was taken to southwestern Greenland to investigate in situ the potential application of AVIRIS to estimate the mineralogy and composition of rocks exposed in Archean terranes. The goal was to
Curtiss, Brian, Goetz, Alexander F. H.
core   +1 more source

Magnetotelluric Imaging of a Magma Plumbing System From the Asthenosphere to Crust Beneath the Newer Volcanic Province, Australia

Geophysical Research Letters, Volume 52, Issue 24, 28 December 2025.
Abstract The Newer Volcanic Province (NVP) in southeastern Australia is a classic example of continental intraplate volcanism located far from a plate boundary, yet the configuration of its magma plumbing system remains unclear. Using three‐dimensional (3D) magnetotelluric (MT) inversion, we imaged a vertically continuous, trans‐lithospheric conductive
Xinpeng Ma, Yunhe Liu, Changchun Yin, Haibin Yang, Zhihao Rong, Jingru Li, Lutz Gross, Yabin Li   +7 more
wiley   +1 more source

Magmatic significance and hydrothermal alteration of layered chromitites from the Bracco Gabbro Complex, Ligurian Ophiolites, Italy

Bulletin of the Mineral Research and Exploration
The Bracco chromitites are hosted in the Mesozoic Ligurian Ophiolites (Italy) and provide key insights into the magmatic and post-magmatic (i.e. metamorphic and hydrothermal) evolution ofgabbro-hosted chromitites in an oceanic mantle.
Federica Zaccarini, Raphael J. Baumgartner, Constantinos Mavrogonatos, Giorgio Garuti   +3 more
doaj   +1 more source

Composition and Structure of Zircon from Hydrothermal Uranium Occurrences of the Litsa Ore Area (Kola Region, Russia)

Geosciences, 2020
Zircon grains from various metagranitoids (plagio- and monzo-granites, gneisses, metasomatic rocks, and pegmatoid veins) from the Skal’noe and Dikoe sites of the Litsa uranium ore area (Kola Region, Russia) were studied in order to reconstruct the ...
Tatiana Kaulina, Lyudmila Lyalina, Vadim Kamenetsky, Vadim Il’chenko, Vladimir Bocharov, Maria Gannibal   +5 more
doaj   +1 more source

Eclogitic metatrondhjemites from metaophiolites of the Western Alps [PDF]

, 2016
In the Urtier valley (southern Aosta Valley, Italy), the Piemonte metaophiolites mainly consist of serpentinized peridotites including pods and boudinaged layers of Fe-metagabbro and trondhjemite transposed in the main eclogitic foliation.
Benciolini, Luca, Martin, Silvana, Meyzen, CHRISTINE MARIE, Tartarotti, Paola, Toffolo, Luca   +4 more
core  

The Buoyancy of Cratonic Lithospheric Mantle

Geophysical Research Letters, Volume 52, Issue 24, 28 December 2025.
Abstract Cratons are generally thought to be characterized by stable, long‐lived mantle roots. However, recent studies have suggested that the lithospheric mantle may be prone to removal, implying that it may be denser than the asthenosphere. To address these suggestions, we use a global data set of mantle xenoliths to estimate the density structure of
Z. J. Sudholz, A. Copley, K. Priestley
wiley   +1 more source

Study on the mechanism of remote sensing anomaly extraction and correlation analysis of ore controlling: Take the Qimantag metallogenic belt of Qinghai as an example

矿业科学学报, 2017
Information extraction from remote sensing and the research of ore controlling factors has been in the two aspects isolated corrosion, the relationship between remote sensing anomaly extraction and deposit metasomatic alteration in the theory system has ...
Tang Chao, Shao Longyi
doaj  

A major element, PGE and Re-Os isotope study of Middle Atlas (Morocco) peridotite xenoliths : evidence for coupled introduction of metasomatic sulphides and clinopyroxene [PDF]

, 2010
We present major element and PGE (platinum-group-element) abundances in addition to Re–Os isotope data for 11 spinel-facies whole rock peridotites from a single maar from the Middle Atlas Mountains, Morocco.
Baker, Joel A., Duggen, Svend, Hoernle, Kaj, Pearson, D. Graham, Wittig, Nadine   +4 more
core   +1 more source

Carbonic Fluids Drive Continental Carbon Cycling as Revealed by the Geochemistry of the Eclogite‐Garnet Peridotite Interface

Geophysical Research Letters, Volume 52, Issue 24, 28 December 2025.
Abstract Subduction zones regulate Earth's carbon distribution, yet the mechanism of carbon transfer from continental crust to mantle remains elusive. We examined an eclogite‐garnet peridotite interface from the Chinese Continental Scientific Drilling Program in the Sulu orogen, representing the slab–mantle wedge boundary formed during continental ...
Dong‐Bo Tan, Jing Lei, Yilin Xiao, Hai‐Ou Gu, He Sun, Xiangying Ye, Zeng‐Li Guo   +6 more
wiley   +1 more source