Results 71 to 80 of about 1,086 (189)

Zircon and Melt Extraction From a Long‐Lived and Vertically Extensive Magma System Underneath Ilopango Caldera (El Salvador)

Geochemistry, Geophysics, Geosystems, 2021
The Tierra Blanca (TB) eruptive suite comprises the last four major eruptions of Ilopango caldera in El Salvador (≤45 ka), including the youngest Tierra Blanca Joven eruption (TBJ; ∼106 km3): the most voluminous event during the Holocene in Central ...
A. Cisneros de León, A. K. Schmitt, S. Kutterolf, J. C. Schindlbeck‐Belo, W. Hernández, K. W. W. Sims, J. Garrison, L. B. Kant, B. Weber, K.‐L. Wang, H.‐Y. Lee, R. B. Trumbull   +11 more
doaj   +1 more source

Radiogenic Heating as the Thermal Driver of Himalayan Crustal Heating During Prolonged Thickening

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 11, November 2025.
Abstract The thermal evolution of the crust during continental collision evolves from cold to hot with time, which impacts crustal reworking and differentiation. However, it remains elusive as to the mechanism driving the crust to be hot during the protracted collision.
Shuaiqi Liu, Guibin Zhang, Lifei Zhang, Shuzhen Wang, Feng Chang   +4 more
wiley   +1 more source

The Mg‐Fe Isotope Compositions and Geochemical Effects of Supercritical Fluids: Constraints From an Ultrahigh‐Pressure Eclogite‐Vein System in the Dabie Orogen

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 10, October 2025.
Abstract Supercritical fluids are ideal media for mass transfer from the subducting slab into the mantle wedge. However, little is known about the Mg‐Fe isotope compositions of supercritical fluids in subduction zones. Here, we present the Mg‐Fe isotope data for a coesite‐bearing eclogite‐vein system, which is closely associated with supercritical ...
Tie‐Nan Chen, Ren‐Xu Chen, Yong‐Fei Zheng, Zheng‐Hua Pan, Guo‐Chao Sun, Xue‐Jing Gan   +5 more
wiley   +1 more source

Calibration, Validation and Evaluation of Machine Learning Thermobarometers in Metamorphic Petrology: An Application to Biotite and Outlook for Future Strategy

Journal of Metamorphic Geology, Volume 43, Issue 8, Page 755-780, October 2025.
ABSTRACT Geothermobarometry provides crucial constraints on the physical conditions of metamorphism, offering insights into petrogenetic processes and providing key information on thermal regimes and metamorphic depths to other geological disciplines.
Philip Hartmeier, Jacob B. Forshaw, Pierre Lanari   +2 more
wiley   +1 more source

Coupling Phase Equilibrium Modelling and Apatite‐in‐Garnet Elastic Barometry to Unravel the P–T Path of the Micaschist Unit From the Zicavo Metamorphic Complex (Corsica, France)

Journal of Metamorphic Geology, Volume 43, Issue 7, Page 681-705, September 2025.
ABSTRACT To gain insights into the pressure–temperature evolution of a scarcely studied portion of the Variscan basement of Corsica in southern Europe, we combined phase equilibrium modelling, Zr‐in‐rutile thermometry and apatite‐in‐garnet elastic barometry. We investigated Grt‐St micaschist rocks containing garnet grains of several millimetres in size
Lorenzo Dulcetta, Xin Zhong, Gabriele Cruciani, Johannes Vrijmoed, Jan Pleuger, Marcello Franceschelli, Timm John   +6 more
wiley   +1 more source

Geothermobarometry and development of inverted metamorphism in the Darjeeling-Sikkim region of the Eastern Himalayan

, 1989
The Darjeeling-Sikkim region provides a classic example of inverted Himalayan metamorphism. The different parageneses of pelitic rocks containing chlorite, biotite, garnet, staurolite, kyanite, sillimanite, plagioclase and K-feldspar are documented by a ...
Windley, B. F., Mohan, A., Searle, M. P.
core   +1 more source

Pyroxene chemistry of xenoliths related to volcanic rocks in the Eslamieh Peninsula (Saray volcano): Implications for geothermobarometry and tectonic setting [PDF]

علوم زمین خوارزمی, 2023
The high K-volcanic rocks of the Eslamieh Peninsula (Saray) are exposed in the northwestern Urumieh-Dokhtar magmatic belt. They mainly include phonolitic lavas and related xenoliths.
Pouya Besharati, Ali Kananian, Fatemeh Sepidbar   +2 more
doaj  

Efficacy of Assessing Magmatic Storage Depth Using Natural Samples, Experiments and Thermodynamic Models: A Case Study From Valles Caldera, NM (USA)

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 7, July 2025.
Abstract Estimates of magmatic storage are typically made using mineral assemblages in natural samples, experiments and thermodynamic models (e.g., MELTS), where each method has limitations. Here, we compare each of these methods to assess their utility in estimating storage conditions for post‐collapse, two‐feldspar high‐silica rhyolites (HSRs ...
Magdalen A. Grismer, Laura E. Waters, Gordon M. Moore, Gabriela A. Farfan   +3 more
wiley   +1 more source

All Supplementary Tables for " Long-term volcano evolution controlled by lateral collapse at Antuco volcano, southern Andes, Chile "

, 2023
Supp.   Table 1: Normalised major element composition for bulk   rock analyses of Antuco pre- and post-collapse samples Supp. Table 2: Major element composition for glass analyses of Antuco pre- and post-collapse samples Supp.
Jorge Romero (9323429)
core   +1 more source

Temperature and pressure in the environment of epithermal alteration: a case study at Ibaré Lineament, Rio Grande do Sul, Brazil

Brazilian Journal of Geology
: The Ibaré Lineament is a shear zone that sections the Western portion of Sul-riograndense Shield, affecting the orthogneissic rocks of Santa Maria Chico Granulitic Complex, acting as a conduct for hydrothermal fluids.
Kelvyn Mikael Vaccari Ruppel, Norberto Dani, Marcus Vinicius Dorneles Remus, Luiz Henrique Ronchi, Marcia Elisa Boscato Gomes, Eliel Senhorinho   +5 more
doaj   +1 more source