Results 51 to 60 of about 1,086 (189)

Thermal Buffering, Heat Advection and Crustal Thinning in the Ryoke Metamorphic Complex, Yanai, Southwest Japan

Journal of Metamorphic Geology, Volume 44, Issue 4, Page 287-310, May 2026.
ABSTRACT The metamorphic zoning and geothermobarometry of the Ryoke metamorphic complex in the Yanai area, southwest Japan, show that its thermobaric structure was buffered by the dehydration melting of biotite. The temperatures over most of the area covered by the three high‐grade zones (8.5‐ to 19.0‐km depth) are consistent with those of the ...
Takeshi Ikeda, Kazuhiro Miyazaki, Yu Sugawara, Risa Hayashi   +3 more
wiley   +1 more source

Geothermobarometry of basaltic glasses from the Tamu Massif, Shatsky Rise oceanic plateau

Geochemistry, Geophysics, Geosystems, 2013
We present the results of a petrological study of core samples from Tamu Massif (Site U1347), recovered during the Shatsky Rise Integrated Ocean Drilling Program (IODP) Expedition 324.
Anika Husen, Renat R. Almeev, François Holtz, Jürgen Koepke, Takashi Sano, Kurt Mengel   +5 more
doaj   +1 more source

Coesite Discovery in Eclogites Confirms UHP Metamorphism in the Orlica‐Śnieżnik Dome (SW Poland)

Journal of Metamorphic Geology, Volume 44, Issue 3, Page 200-225, April 2026.
ABSTRACT Eclogite lenses are exposed within the orthogneiss‐dominated core of the Orlica‐Śnieżnik Dome in the Sudetes, which forms the northeastern margin of the Bohemian Massif (Variscan Belt of Central Europe). The presence of coesite inclusions in garnet and omphacite confirms that these eclogites underwent ultrahigh‐pressure metamorphism.
Małgorzata Nowak, Lucie Tajčmanová, Marcin Dąbrowski, Iris Buisman, Jacek Szczepański   +4 more
wiley   +1 more source

A clinopyroxene-basalt geothermobarometry perspective of Columbia Plateau (NW-USA) Miocene magmatism

, 2005
The origin of NW-USA Columbia River Basalt Group Miocene magmatism and its relation to tectonism has been widely debated and is still open to study. We investigated the pre-eruptive evolution of the magmas, to constrain pressures and temperatures of the ...
Reidel, SP, Caprarelli, G
core   +1 more source

Magmin_pt: an Excel-Based Mineral Classification and Geothermobarometry Program for Magmatic Rocks

, 2022
Igneous rock forming minerals carry valuable information from the deep earth that is not directly accessible to the surface. Each phase represents physico-chemical conditions under which various magmatic processes occur at a wide range of depths from ...
Asan, Kürşad, Mesut Gündüz, Gunduz, Mesut   +2 more
core   +1 more source

Mantle Xenolith Evidence for Lithospheric Thinning and Metasomatic Modification Beneath the Eastern Fiji Plateau: Implications for Samoan Plume Supply, Intraplate Volcanism, and Orocline Formation

New Zealand Journal of Geology and Geophysics, Volume 69, Issue 1, March 2026.
We provide petrographic and geochemical characterisation of mantle xenoliths from Koro Island, eastern Fiji. Several lherzolite xenoliths display spinel–pyroxene symplectite textures, including preserved former grain boundaries, consistent with garnet breakdown that we attribute to thinning of a preexisting garnet‐facies lithospheric mantle beneath ...
Natasha Barrett, Stephen T. Johnston, Neil N. Kumar, Holger Sommer, D. Graham Pearson   +4 more
wiley   +1 more source

Nature of magma and ore-forming conditions at the Randu Kuning porphyry Cu-Au deposit, Indonesia: a comparative study with other Cu-Au deposits in the region

, 2023
The subduction-related Sunda-Banda arc hosts several giant and major Cu–Au–Mo porphyry and epithermal Au systems, making it one of the most important magmatic-related metallogenic belts in Indonesia.
Cendi D. P. Dana (17412787), Grigorios A. Sakellaris (17412799), Theo van Leeuwen (17412802), Ernowo (17412796), Sutarto (17412793), Arifudin Idrus (17412784), Lucas D. Setijadji (17412790)   +6 more
core   +1 more source

Geological-structural mapping and geocronology of shear zones: A methodological proposal

Boletín Geológico, 2021
The deformation registered in rocks in the field can be characterized based on the structures preserved in outcrops, which can related be to wide discontinuity zones named faults and shear zones.
Anny Julieth Forero Ortega, Julián Andrés Lopéz Isaza, Nelson Ricardo López Herrera, Mario Andrés Cuéllar Cárdenas, Lina Maria Cetina Tarazona, Luis Miguel Aguirre Hoyos   +5 more
doaj   +1 more source

Uncertainties in the activities of garnets and their propagation into geothermobarometry

European Journal of Mineralogy, 1994
The effect of uncertainties in the activities of garnets on P-T estimates are explored by propagating the (co-)variances of an internally consistent set of the least squares-derived mixing parameters through the thermodynamic formulations of(1) the garnet-biotite geothermometer and (2) the garnet-Al 2 SiO 5 -plagioclase-quartz (GASP) geobarometer.
openaire   +1 more source

Geothermobarometry using minerals at non-equilibrium: a corona example

European Journal of Mineralogy, 2001
A simple extension of geothermobarometric technique is developed, from the usual case of assumed equilibrium among all minerals, to layered coronas with gradients of chemical potential. For reactions among end-members in the minerals, instead of the assumption of zero affinity (-δG) = 0, (-δG) ratios are used.
John R. Ashworth, Valentin S. Sheplev, Vladimir V. Khlestov, Vyatcheslav A. Ananyev   +3 more
openaire   +1 more source