Results 11 to 20 of about 5,229 (211)

Experimental Constraints on the Origin of the 1991 Pinatubo Dacite [PDF]

Journal of Petrology, 2003
Crystallisation and mantle-interaction experiments have been performed on the 1991 Pinatubo dacite to constrain its petrogenesis. In the dacite- H2O system at 1000 MPa, magnetite and either clinopyroxene or amphibole are the liquidus phases. No garnet is observed at this pressure.
Prouteau, Gaëlle, Scaillet, Bruno
core   +11 more sources

Ruby Xenocrystals in Dacite from Central Mexico [PDF]

Geofísica Internacional
The occurrence of 1-2 cm in diameter, anhedral xenocrystals of red corundum (ruby) in a dacitic lava- flow from central Mexico -in the state of Hidalgo- has been recorded. Geochemically, this dacite nearly resembles adakitic rock (SiO2=63.73 66.64 wt %),
Luis Enrique Ortiz Hernández, Jose Cruz Escamilla Casas   +1 more
doaj   +3 more sources

Study on microstructural and mechanical properties of cementitious materials composed of fly ash and dacite powder

Frontiers in Materials
The hydration reaction of mass concrete seriously endangers the structural safety. At present, the concrete production relies excessively on fly ash due to hydration reaction.
Lu Liu, Jianjun Tan, Jianjun Tan, Huanfeng Qiu, Huanfeng Qiu, Huanfeng Qiu, Jianbo Zhang, Yong Guo   +7 more
doaj   +2 more sources

The characteristics and morphology of columnar dacite in Tawau, Sabah [PDF]

Warta Geologi, 2020
The occurrence of columnar jointing is commonly associated with volcanic rocks and a rapid cooling environment. We recently discovered well-preserved columnar dacite on the road cutting slope in the eastern part of Tawau town, Sabah.
James, Elvaene, Erfen, Hennie Fitria W. Soehady, GHANI, Azman A., Chuwat, Angela Vidda, Ejiga, E. G.   +4 more
openaire   +3 more sources

Discovery of basaltic and magnesian andesite magmas within the Hunga volcanic system, Tonga arc [PDF]

Scientific Reports
The climactic explosive eruption of Hunga volcano in January 2022 destroyed a significant portion of the Hunga Tonga-Hunga Ha’apai islands, deepening the caldera floor by over 600 m and depositing 3.5 km3 of material onto its submarine flanks.
Yoshihiko Tamura, Tomoki Sato, Richard Wysoczanski, Kevin Mackay, Iona McIntosh, Qing Chang, Takashi Miyazaki, Bogdan Vaglarov, Yasuhiro Hirai   +8 more
doaj   +2 more sources

Mechanical properties and microstructure of cement-fly ash-dacite powder composite cementitious system

Developments in the Built Environment
This study used the indexes of fineness, pozzolanic activity, hydration heat, mortar fluidity and strength, and circular cracking degree, and combined the techniques of SEM, EDS, XRD, MIP, and TG-DSC.
Zheyuan Liu, Juhong Han, Liangjian Hu
doaj   +2 more sources

On the Tamagawa Dacites

The Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists, 1969
In the surveyed area, so-called Tamagawa Dacites are largely divided into three parts. The lower part of the Tamagawa Dacites is an alternation of dacitic tuff, lapilli tuff, tuff breccia, volcanic breccia, tuffaceous sandstone and siltstone (T1), accompanied by an alternation of siltstone and tuff (T2) on ascending order.
Orimoto, Sachio, Yasuda, Tadashi
openaire   +2 more sources

The age of undeformed dacite intrusions within the Kolaka Fault zone, SE Sulawesi, Indonesia [PDF]

, 2014
We present petrologic, geochemical and U–Pb sensitive high resolution ion microprobe (SHRIMP) data from previously undocumented dacite intrusions from the SE Arm of Sulawesi.
White, Lloyd, Hall, Robert, Armstrong, Richard   +2 more
core   +1 more source

Role of crustal assimilation in the evolution of andesitic and dacitic magmas from Makran volcanic arc with special reference to Pb isotopes [PDF]

پترولوژی
Introduction The Makran volcanic arc in southern Iran is one of the few active ocean-continent subduction systems in the Alp-Himalaya orogen (Priestley et al., 2021). It includes four volcanic fields: Shahsavaran (SVF), Bazman (BVF), west of Khash (KVF),
Zahra Firouzkouhi, Ali Ahmadi
doaj   +1 more source

Zircon U-Pb ages and geochemistry of Early Cretaceous volcanic rocks, northwestern Korean Peninsula: Constraints on Late Early Cretaceous continental arc distribution in Northeast Asia

Journal of Asian Earth Sciences: X, 2022
In the northwestern Korean Peninsula, Cretaceous volcanic rocks are composed of andesite, andesite-dacite and rhyolite intercalated with terrigenous clastic rocks.
Jonghyok Yang, Hyonchol Ku, Ung Pak, Chungil Ri, Myongchol Kim, Cholsu Jong, Hyonuk Pak, Jongnam Kim, Songhyok Ju, Cholhyon Kim, Jusong Yun, Sunghyon Kim   +11 more
doaj   +1 more source