Results 71 to 80 of about 542 (177)

Co‐Calcination of Silicate or Aluminosilicate Network of Clay and Non‐Clay Minerals With NaOH: Physicochemical Insights

Journal of the American Ceramic Society, Volume 109, Issue 6, June 2026.
Effects of co‐calcination with alkali hydroxide on pure clay minerals (kaolinite, montmorillonite) and typical impure minerals (quartz, feldspar) are presented. Co‐calcining montmorillonite and quartz with sodium hydroxide improves their reactivity. Co‐calcining kaolinite with sodium hydroxide reduces its reactivity.
Ishrat Baki Borno, Farzana Mustari Nishat, Maria C. G. Juenger, Warda Ashraf   +3 more
wiley   +1 more source

Stratified Pit Features at the Presbytère de l'Ancienne‐Lorette (CeEu‐11) and the Fort Odanak (CaFe‐7) Sites in Québec, Canada: A Comparative Geoarchaeological Analysis

Geoarchaeology, Volume 41, Issue 3, May/June 2026.
ABSTRACT A geoarcheological study of two large, stratified Indigenous pit features discovered at two Jesuit mission sites in Québec (Canada) was carried out to offer a detailed documentation of their contents and better understand their use over time. One of the pits is a 17th c.
Sarah Robert, Allison Bain, Najat Bhiry
wiley   +1 more source

Uranium, vanadium, and chromium in fish scales: A redox‐unrelated accumulation pathway in continental margin sediments

Limnology and Oceanography, Volume 71, Issue 5, May 2026.
Abstract Enrichment patterns of the redox‐ and bio‐sensitive trace elements U, V, Cr, and Ni in margin sediments are essential for environmental reconstructions. However, their sedimentary accumulation pathways are not fully understood. While the accumulation of toxic trace elements like Cd, Hg, Pb, and Zn has been relatively well studied in fish ...
Frederik Gäng, Lena Göller, Volker Brüchert, Katharina Pahnke, Philipp Böning   +4 more
wiley   +1 more source

Petrogenesis and age of skarns associated with felsic and metamafic dykes from the Paraíba do Sul Complex, southern Espírito Santo State

Brazilian Journal of Geology
: This paper concerns the study of petrography, mineral chemistry and geochronology of skarns generated at the contact of marbles of the Paraíba do Sul Complex with felsic and metamafic dykes in the southern Espírito Santo State.
Raissa Beloti de Mesquita, Hanna Jordt-Evangelista, Gláucia Nascimento Queiroga, Edgar Batista de Medeiros Júnior, Ivo Antônio Dussin   +4 more
doaj   +1 more source

Turbidity in alkali feldspars from granitic pegmatites

, 2013
Alkali feldspars from pegmatite of Brazil and Spain have microscopic to submicroscopic inclusions giving a >turbid> and >clouded> appearance. Inclusions are isotropic, irregular and spatially associated with patch/vein lamellae in network and/Or isolated masses. Inclusions have no detectable lines in XRD and microprobe analyses show strong variability:
Sánchez Muñoz, Luis, Sobrados, Isabel, Menéndez, Esperanza, Rouer, Olivier, Sanz Perucha, Jesús, García-Guinea, Javier   +5 more
openaire   +1 more source

High Temperature Friction and Strength of Felsite and Basalt: Implications for Supercritical EGS at Krafla, Iceland

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 5, May 2026.
Abstract One promising potential site for extracting supercritical geothermal fluids is the Krafla volcano, Iceland, into which a borehole was drilled very close to a shallow rhyolite magma chamber at about 2 km depth. Besides the technical challenge to drill in this setting, the extreme temperature conditions of T > 900°C close to the magma body may ...
E. Rybacki, V. Schuster, J. Starke, S. Incel   +3 more
wiley   +1 more source

Microspherules formed by lightning strikes

Meteoritics &Planetary Science, Volume 61, Issue 5, Page 743-767, May 2026.
Abstract Natural microspherules are formed by high‐temperature processes and are present throughout the geologic record to the present day. We report the discovery of large numbers of microspherules recovered from a rock pavement in the Pilbara region, Western Australia.
M. R. Boyd, M. J. Genge, A. G. Tomkins
wiley   +1 more source

Archaeological Granite Sarcophagi Restoration and Conservation from The New Kingdom era in Luxor – Egypt An Investigative and Applied Study [PDF]

مجلة کلية الآثار - جامعة القاهرة
Archaeological granite sarcophagi are exposed to many deterioration factors in the burial and exposure environments, the chosen granite sarcophagus which belonged to Tjay or Thay (19th dynasty – New Kingdom), Tomb TT23 in Sheikh Abd el-Qurna, Luxor ...
Shaimaa Sayed, Fatma Khairy, Ahmed Gad
doaj   +1 more source

Geoheritage Assessments of Cascades and Waterfalls in Batu Melintang, Jeli, Kelantan, Malaysia [PDF]

BIO Web of Conferences
The study area is between a dense forest and a rubber plantation in Kelantan’s Jeli District. This study aims to assess the geoheritage values of Lata Hokkaido, Lata Janggut, Marina Waterfall and Lata Bobby. The lithology of the study area is composed of
Sulaiman Nursufiah, Yazizul Rahman Siti Nur Adilah, Wan Ahmad Khalil Wan Ahmad Aqil Fahmi, Safai Azri Sulaimi, Sulaiman Noorzamzarina   +4 more
doaj   +1 more source

Accessory minerals and evolution of tin-bearing S-type granites in the western segment of the Gemeric Unit (Western Carpathians)

Geologica Carpathica, 2018
The S-type accessory mineral assemblage of zircon, monazite-(Ce), fluorapatite and tourmaline in the cupolas of Permian granites of the Gemeric Unit underwent compositional changes and increased variability and volume due to intensive volatile flux.
Broska Igor, Kubiš Michal
doaj   +1 more source