Results 51 to 60 of about 10,620 (270)

Thermal‐induced fracture evolution and acoustic signature of Beishan granite: Insights into tensile strength of barrier system for high‐level radioactive waste disposal

Deep Underground Science and Engineering, EarlyView.
The tensile strength of granite, a proposed host for nuclear waste, degrades severely above 400°C. We link this to specific microcracking patterns captured by acoustic emission, establishing a scientific basis for assessing repository safety under thermal load.
Wei Zeng, Shijie Li, Xiaozhao Li, Zhen Huang, Shangtong Yang, Wentao Xu, Biao Wang, Yun Wu   +7 more
wiley   +1 more source

A simple predictive model for the thermal expansion of AlSi3 feldspars

, 2008
We have investigated the thermal expansion of several synthetic feldspars, including Li-feldspar, rubicline (Rb-microcline), Rb-sanidine, and buddingtonite (NH4-feldspar).
Mott, Andrew, Hovis, Guy L., Morabito, Joanna R., Harlow, Daniel, Person, Erik L., Henderson, C. Michael B, Spooner, Amy, Roux, Jacques   +7 more
core   +1 more source

Numerical investigation of natural fracture activation and leakage risk during CO2 sequestration in depleted sandstone reservoirs

Deep Underground Science and Engineering, EarlyView.
This study investigates the hydro‐mechanical response and fracture evolution in depleted sandstone reservoirs during CO2 injection, considering both direct wellbore injection and hydraulic‐fracture‐assisted injection. The graphical abstract illustrates how CO2 injection induces dynamic stress redistribution, leading to natural fracture activation ...
Haiyang Wang, Chen Lu, Yufei Wang, Yichen Yang, Xu Su, Desheng Zhou, Qingqing Wang   +6 more
wiley   +1 more source

K-paracelsian (KAlSi3O8·H2O) and identification of a simple building scheme of dense double-crankshaft zeolite topologies

IUCrJ, 2019
During screening of the phase space using KOH and 1-methyl-4-aza-1-azoniabicyclo[2.2.2]octane hydroxide (1-methyl-DABCO) under hydrothermal zeolite synthesis conditions, K-paracelsian was synthesized. Scanning electron microscopy, energy dispersive X-ray
Cristian-R. Boruntea, Peter N. R. Vennestrøm, Lars F. Lundegaard   +2 more
doaj   +1 more source

Concentration of K-feldspar from a pegmatitic feldspar ore by flotation

International Journal of Mineral Processing, 2006
Abstract Abundant reserves of Na-feldspar (albite) and K-feldspar (orthoclase or microcline) are found in granites, syenite, tracite and pegmatites. As both feldspar minerals have similar chemical structure and physicochemical properties, their separation is challenging. Flotation is known to be the only technique to enable their separation.
Karagüzel, Cengiz, Gülgönül, İlhan, Demir, Cengiz, Çınar, Mehmet Ulaş, Çelik, Mehmet S.   +4 more
openaire   +6 more sources

Geochemistry and Geochronology of Magmatic Rocks in Southwestern and Northeastern Cambodia: Implications for the Tectonic Evolution and Metallogenesis of the Loei Fold Belt

Geological Journal, EarlyView.
The composition of intrusive rocks suggests that the magma was likely generated in a subduction‐related setting. The arc crustal thickness in the Phnom Sro Ngam and Halo Prospects was probably < 40 km during emplacement. Zircon U–Pb age range indicates a correlation with Loei Fold Belt magmatic activity.
Sirisokha Seang, Khin Zaw, Kakda Kret, Ivan Belousov, Kotaro Yonezu, Koichiro Watanabe, Charles Makoundi   +6 more
wiley   +1 more source

A Reassessment of Petrochemistry of ~1.2 Ga Tonalitic Rocks of the Northern Tugela Terrane, Natal Metamorphic Belt, South Africa: Further Constraints on the Evolution of This Belt

Geological Journal, EarlyView.
Our petrochemical studies on ~1.2 Ga granitoids of the Natal Metamorphic Belt, South Africa, do not suggest any property similar to Phanerozoic‐style subduction‐related granitoids. Plot of Kotongweni Tonalite in Y versus Sr diagram (after Moyen 2011), note that most samples have Sr/Y < 50.
Palesa Leuta, Saumitra Misra, Thembiso O. Basupi   +2 more
wiley   +1 more source

FINE SAND MINERALOGY OF VERTISOLS OF ANDHRA PRADESH

Madras Agricultural Journal, 1985
The quantitative magical make up or time sana tractions in vertisols of Andhra Pradesh has been studied using petrological microscope. The study revealed that the feldspars were the dominant minerals followed by quartz and micas in six pedons, whereas in
G. V. SUBBAIAH and T. S. MANICKAM
doaj   +1 more source

Petrogenetic constraints on the felsic vein magmatism in northern Portugal based on petrological and geochemical data

Comptes Rendus. Géoscience, 2021
Three of the largest granite porphyries of northern Portugal were studied to improve current knowledge on the regional felsic vein hypabyssal magmatism.
Oliveira, António João Teixeira, Martins, Helena Cristina Brites, da Silva, Helena Maria Sant’Ovaia Mendes   +2 more
doaj   +1 more source

Thermal quenching of luminescence processes in feldspars

, 1995
The technique of optically stimulated luminescence has important uses in the dose evaluation of irradiated feldspars. The luminescence process involves the eviction of electrons from donor traps, charge transfer through the conduction band, and ...
Bøtter-Jensen, L., Duller, G.A.T., Poolton, N.R.J.   +2 more
core   +1 more source