Results 51 to 60 of about 130,604 (144)
Journal of Geophysical Research: Solid Earth, Volume 130, Issue 10, October 2025.Abstract Studying the behavior of dormant volcanoes is a major challenge in volcanology. Here, we conducted a 10‐year survey of hydrothermal mineralization at Campi Flegrei, an active volcano near Naples in Italy, which last erupted in 1538. Our survey revealed a significant output of boric acid at the hydrothermal sulfate discharge area of Pisciarelli,
M. Piochi +3 more
wiley +1 more source
Fluid or Melt? Distinguishing Syn‐Deformational Interaction Pathways
Journal of Metamorphic Geology, Volume 43, Issue 8, Page 810-838, October 2025.ABSTRACT Understanding whether deformation occurred in the presence of aqueous fluid or silicate melt is crucial for interpreting ductile shear zones, impacting their thermal and geochemical evolution, and having rheological consequences. To identify the syn‐deformational fluid type, we investigate contrasting shear zones active during the Alice ...
Hindol Ghatak +3 more
wiley +1 more source
Optimization of Production Parameters of Alkali-Activated Concrete
, 2021 Concrete is a frequently preferred construction material which is used in many fields and applications such as buildings, roads, tunnels, bridges, dams and harbors.
Soriano, L. +4 more
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UMYU Scientifica JournalThe lithological and structural architecture to unravel the compositions and tectonic evolution of the Nigerian Basement Complex has not been fully documented by geoscientists. As such, this research aimed to investigate the lithological and structural
Nana Fatima Abdulmalik +1 more
doaj +1 more source
Journal of Metamorphic Geology, Volume 43, Issue 7, Page 663-680, September 2025.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
, 1981 The niobium-tantalum mineralization associated with granite pegmatites and alkali granitic rocks in Africa has been studied and a selection of 124 chemical analyses of various niobium and tantalum minerals encountered during the study is presented. X-ray
Fadipe, Akinola, von Knorring, Oleg
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Effect of radiation-induced emission of Schottky defects on the formation of colloids in alkali halides [PDF]
, 2003 Formation of vacancy clusters in irradiated crystals is considered taking into account radiation-induced Schottky defect emission (RSDE) from extended defects.
Hartog, H.W. den, +8 more
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Geochemistry, Geophysics, Geosystems, Volume 26, Issue 6, June 2025.Abstract A striking feature of the Imilchil alkaline province, in the Moroccan Central High Atlas, is the close association of magmatic intrusions with Triassic sediments exhumed by diapirism. This study reports field, petrographic, geochemical and Sr‐Nd isotopic data, as well as new U‐Pb zircon ages, which allow us to constrain the timing of the ...
Youssef Ahechach +10 more
wiley +1 more source
, 1996 :The primary focus of this review is on P-T conditions, mineralogical indicators of melt or fluid composition and textural evolution; lesser treatment is given to pegmatite sources or to pegmatite-wallrock interactions.
David London
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Alkali thresholds in concrete; the balanced alkali approach in ASR mitigation
, 2021 The Alkali Silica Reaction (ASR) is a deleterious reaction in concrete that poses significant durability concern worldwide. As a preventative measure, total alkali content of general purpose Portland cements can be limited.
Thomas, P +3 more
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