Results 21 to 30 of about 1,086 (189)

A complex patchwork of magma bodies that fed the Bishop Tuff supereruption (Long Valley Caldera, CA, United States): Evidence from matrix glass major and trace-element compositions

Frontiers in Earth Science, 2022
The geologic record reveals events in which enormous volumes (100–1000s of km3) of magma were erupted in a matter of days to months. Yet, the architecture of magmatic systems that feed supereruptions can only be investigated through the study of ancient ...
Guilherme A. R. Gualda, Mark S. Ghiorso, Aaron A. Hurst, Aaron A. Hurst, Madeline C. Allen, Richard W. Bradshaw   +5 more
doaj   +1 more source

Petrogenesis and tectonic implications of Seih Syn-tectonic gabbroic intrusion, South Sinia, Egypt: Insights from whole-rock geochemistry, mineral chemistry and P-T estimate [PDF]

Delta Journal of Science, 2021
The present work deals with the gabbroic intrusion in the Wadi Seih area as a part of the Neoproterozoic Pan-African basement in the southwestern part of Sinai, Egypt. It comprises as small plutons intruded into Seih metamorphic belt.
Ahmed E. Masoud, Dina Hamdy Ramadan, Mohamed Abu Anbar, Mohamed F. Ghoneim   +3 more
doaj   +1 more source

Geothermobarometry and geochemical modeling of Archean charnockites from Carajás Province, Amazonian craton, Brazil [PDF]

Brazilian Journal of Geology, 2022
Orthopyroxene-bearing tonalites/trondhjemites with scarce quartz diorites comprise the Café enderbite that crops out in three Neoarchean plutons in the central portion of the Canaã dos Carajás domain, Carajás Province, northern Brazil.
Bhrenno Marangoanha, Davis Carvalho de Oliveira, Cláudio Nery Lamarão, Gisele Tavares Marques, Luciano Ribeiro da Silva   +4 more
doaj   +1 more source

Application of clinopyroxene as a petrogenic mineral in determining the nature of Ordovician intrusive rocks in Ziarat (Southern Gorgan, Golestan Province)

Journal of Economic Geology, 2021
Introduction The study area is located in the Eastern Alborz zone (Gansser, 1951) which is a part of the northern margin of Gondwana during the Paleozoic (Stöcklin, 1974; Salehi Rad, 1979; Berberian and King, 1981; Şengor, 1990; Alavi, 1991, 1996 ...
Qassem Azizzadeh, Seyed Jamal Sheikhzakariaee, Mostafa Raghimi , Aziz Rahimi Chakdel   +3 more
doaj   +1 more source

Geothermobarometry of Fe-Ti hosted gabbroid rocks in the Dar Gaz district (Kahnouj Ophiolitic Complex)

Journal of Economic Geology, 2022
Introduction The Kahnouj Fe-Ti ore district is located 25 km southeast of Kahnouj city associated with the large gabbro intrusion of the Kahnouj ophiolitic complex.
Majid Ghasemi Siani, Hamed Ebrahimi Fard
doaj   +1 more source

Thermoelastic properties of zircon: Implications for geothermobarometry

American Mineralogist, 2022
Abstract A thermal-pressure equation of state has been determined for zircon (ZrSiO4) that characterizes its thermoelastic behavior at metamorphic conditions. New pressure-volume (P-V) data from a “Mud Tank” zircon have been collected from 1 bar to 8.47(1) GPa using X-ray diffraction, and elastic moduli were measured from room ...
Alix M. Ehlers, Gabriele Zaffiro, Ross J. Angel, Tiziana Boffa-Ballaran, Michael A. Carpenter, Matteo Alvaro, Nancy L. Ross   +6 more
openaire   +4 more sources

Varying processes, similar results: How composition influences fragmentation and subsequent feeding of large pyroclastic density currents

Frontiers in Earth Science, 2022
Unlike their silicic counterparts, mafic eruptions are known for being on the low-end of the explosivity spectrum with eruption styles commonly ranging from effusive to Hawaiian fire fountaining.
Olivier Bernard, Olivier Bernard, Olivier Bernard, Caroline Bouvet de Maisonneuve, Caroline Bouvet de Maisonneuve, Laurent Arbaret, Laurent Arbaret, Kazuhide Nagashima, Jeffrey Oalmann, Arief Prabowo, Antonius Ratdomopurbo   +10 more
doaj   +1 more source

Multi‐Stage Evolution of the South Australian Craton: Petrological Constraints on the Architecture, Lithology, and Geochemistry of the Lithospheric Mantle

Geochemistry, Geophysics, Geosystems, 2022
To improve the understanding of the formation and evolution of the sub‐continental lithospheric mantle (SCLM) underlying the South Australian Craton we have conducted a detailed petrological study on >3,000 mantle xenocrysts from 13 kimberlites emplaced ...
Z. J. Sudholz, G. M. Yaxley, A. L. Jaques, S. A. Cooper, K. Czarnota, W. R. Taylor, J. Chen, B. M. Knowles   +7 more
doaj   +1 more source

P-T data of Ky-St-Grt gneisses hosting HP amphibolites and eclogites from the Austroalpine Polinik complex, Kreuzeck Mountains, Eastern Alps, Austria

Open Geosciences, 2011
This study focuses on metapelites of the Polinik complex in the Kreuzeck Mts. southeast of the Tauern Window, Eastern Alps, where kyanite — staurolite — garnet gneisses host eclogites and high pressure (HP) amphibolites of the Austroalpine basement.
Michálek Martin, Putiš Marián, Hauzenberger Christoph   +2 more
doaj   +2 more sources

PTEXL - Geothermobarometry of Mantle Rocks

, 2022
An Excel spreadsheet for geothermobarometry of mantle rocks (peridotites, eclogites, pyroxenites) and inclusions in ...
Stachel, Thomas
core   +1 more source