Results 161 to 170 of about 5,229 (211)
Provenance and tectonic settings of late Triassic-Jurassic deposits in the Southwestern Yangtze block: evidence from the geochemistry, SW China. [PDF]
Sci RepYao S +7 more
europepmc +1 more source
Determination of Mechanical Properties of Altered Dacite by Laboratory Methods
Minerals (Basel, Switzerland), 2021 This paper presents a methodology for determining the uniaxial and triaxial compressive strength of heterogeneous material composed of dacite (D) and altered dacite (AD). A zone of gradual transition from altered dacite to dacite was observed in the rock
Vladimir Milisavljević +2 more
exaly +2 more sources
Internal Structure and Emplacement of an Upper Pliocene Dacite Cryptodome, Milos Island, Greece
Journal of Volcanology and Geothermal Research, 2003 The Upper Pliocene Kalogeros cryptodome is exposed on the northeastern part of Milos, Greece. The dacite cryptodome is 800-1300 m across and at least 120 m high.
Jocelyn McPhie
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Endogenous Growth of a Miocene Submarine Dacite Cryptodome, Rebun Island, Hokkaido, Japan
Journal of Volcanology and Geothermal Research, 1998 Momo-iwa, Rebun Island, Hokkaido, Japan, is a dacite cryptodome 200-300 m across and 190 m high. The dome is inferred to have intruded wet, poorly consolidated sediment in a shallow marine environment.
Jocelyn McPhie, Yoshihiko Gotō
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Contributions To Mineralogy and Petrology, 1981
Microphenocrystic pyrrhotites were observed in the glassy groundmass of two dacite rocks from Satsuma-Iwojima, southwest Kyushu, Japan. It suggests that the dacite magma was saturated with respect to pyrrhotite at the time of eruption, and thus the sulfur contents in the groundmass can be taken as the solubility of sulfur in the dacite magma.
Tetsumaru Itaya, Akira Ueda
exaly +2 more sources
Microphenocrystic pyrrhotites were observed in the glassy groundmass of two dacite rocks from Satsuma-Iwojima, southwest Kyushu, Japan. It suggests that the dacite magma was saturated with respect to pyrrhotite at the time of eruption, and thus the sulfur contents in the groundmass can be taken as the solubility of sulfur in the dacite magma.
Tetsumaru Itaya, Akira Ueda
exaly +2 more sources
Minerals (Basel, Switzerland)In this work, a series of electrical conductivities of pyrite-bearing dacite were measured under 10−1–106 Hz, 573–973 K, 1.0–3.0 GPa, and different pyrite contents ranging from 0 vol.% to 20 vol.%) using a Solartron–1260 A ...
Lidong Dai, Ziming Hu
exaly +2 more sources
Degassing and Crystallization of Ascending Andesite and Dacite
Philosophical Transactions Series A, Mathematical, Physical, and Engineering Sciences, 2000The prevalence of andesitic and dacitic volcanic eruptions over the past 20 years has led to a new appreciation of processes typical of magmas of intermediate composition. Extensive syn-eruptive crystallization, driven by decompression and volatile exsolution, is one such process.
Jon Blundy, Kathy Cashman
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Water diffusion in dacitic melt
Geochimica et Cosmochimica Acta, 2009H2O diffusion in dacitic melt was investigated at 0.48–0.95 GPa and 786–893 K in a piston-cylinder apparatus. The diffusion couple design was used, in which a nominally dry dacitic glass makes one half and is juxtaposed with a hydrous dacitic glass containing up to ∼8 wt.% total water (H2Ot). H2O concentration profiles were measured on quenched glasses
Huaiwei Ni, Harald Behrens, Youxue Zhang
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H2O diffusion in dacitic melts
Chemical Geology, 2004Abstract We report the first experimental study of the diffusion of H2O in dacitic melts. Dehydration experiments were conducted at 551–637 °C and 1–1450 bars for samples with ∼0.8 to ∼2.5 wt.% total dissolved H2O. The H2O diffusivity is proportional to total H2O contents at ≤0.8 wt.%, but increases exponentially with total H2O at higher H2O contents.
Yang Liu, Youxue Zhang, Harald Behrens
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Bulletin of Volcanology, 2005
Dacitic magma, a mixture of high-temperature (T) aphyric magma and low-T crystal-rich magma, was erupted during the 1991–1995 Mount Unzen eruptive cycle. Here, the crystallization processes of the low-T magma were examined on the basis of melt inclusion analysis and phase relationships. Variation in water content of the melt inclusions (5.1–7.2 wt% H2O)
Koshi Nishimura +4 more
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Dacitic magma, a mixture of high-temperature (T) aphyric magma and low-T crystal-rich magma, was erupted during the 1991–1995 Mount Unzen eruptive cycle. Here, the crystallization processes of the low-T magma were examined on the basis of melt inclusion analysis and phase relationships. Variation in water content of the melt inclusions (5.1–7.2 wt% H2O)
Koshi Nishimura +4 more
openaire +1 more source