Results 11 to 20 of about 145,392 (358)

Experimental study on propagation of hydraulic fracture in volcanic rocks using industrial CT technology

Petroleum Exploration and Development, 2013
To understand the planar and three-dimensional geometry of hydraulic fractures in volcanic rocks, a hydraulic fracturing simulation experiment was conducted using the large-scale triaxial hydraulic fracturing test system in laboratory.
Lichun JIA, Mian CHEN, Liangtian SUN, Zhiyu SUN, Wei ZHANG, Qianqian ZHU, Zhen SUN, Yan JIN   +7 more
doaj   +1 more source

Chemical classification of common volcanic rocks based on degree of silica saturation and CaO/K2O ratio

Anais da Academia Brasileira de Ciências, 2021
Modal classifications of common volcanic rocks are expensive, difficult, or impossible to attain. As a consequence, these rocks are classified using the chemical composition.
JOÃO O.S. SANTOS, LÉO A. HARTMANN
doaj   +1 more source

Geomechanical characterization of volcanic rocks using empirical systems and data mining techniques

Journal of Rock Mechanics and Geotechnical Engineering, 2018
This paper tries to characterize volcanic rocks through the development and application of an empirical geomechanical system. Geotechnical information was collected from the samples from several Atlantic Ocean islands including Madeira, Azores and ...
T. Miranda, L.R. Sousa, A.T. Gomes, J. Tinoco, C. Ferreira   +4 more
doaj   +1 more source

Mineral Analysis in Rocks Using XRD and Petrography [PDF]

, 2019
Rock formation in a region is influenced by many factors such as tectonic and volcanic systems of the area. Both activities will affect the microstructure of the rock. This study analyzes mineral composition in three different rocks.
Iqbal, M. (Mochamad), Setiawan, M. R. (Muhamad), Siregar, R. N. (Rahmat)   +2 more
core   +2 more sources

Application of X-ray Fluorescence Spectrometry and Electron Microprobe in the Identification of Intermediate-Felsic Volcanic Rocks

Yankuang ceshi, 2016
Intermediate-felsic volcanic rock has porphyritic texture and the matrix is characterized by microlitic, cryptocrystalline and vitreous textures. There will be errors when identifying and classifying the rocks using only a polarizing microscope because ...
XU Cui, LI Lin-qing, ZHANG Jie, HE Li, ZHANG Gui-feng, WANG Yan-long   +5 more
doaj   +1 more source

Geological constraints for a conceptual evolutionary model of the slope deformations affecting Mt. Nuovo at Ischia (Italy) [PDF]

, 2015
ischia island was the scenario of several Holocene slope in- stability events occurred at different scales, from shallow mass movements, triggered by meteo-climatic forcing, up to massive rock slope failures such as large debris avalanches these last ...
DELLA SETA, Marta, ESPOSITO, CARLO, MARMONI, GIANMARCO, MARTINO, Salvatore, PACIELLO, ANTONELLA, PERINELLI, cristina, SOTTILI, Gianluca   +6 more
core   +1 more source

Performance of the X-ray powder diffraction (XRD), X-ray fluorescence (XRF) and the industrial computed tomography used for characterization of the vesicular volcanic rock.

Brazilian Journal of Radiation Sciences, 2021
Volcanic rock is a designation in geology given to extrusive igneous rocks. One type of igneous rock of interest, in economic terms, is vesicular, since, besides the knowledge of the morphology (positioning, size, direction, and interconnectivity of the ...
Rodrigo Silva Santos, Francisco Assis Cavallaro, Thiago Lynyker da Silva Bernardes, Rafael Aquino Amadeu, Rafael H. L. Garcia, Alexandre França Velo, Carlos Henrique Mesquita, Margarida Mizue Hamada   +7 more
doaj   +1 more source

Complex examination of the Upper Paleozoic siliciclastic rocks from southern Transdanubia, SW Hungary—Mineralogical, petrographic, and geochemical study [PDF]

, 2007
A vertical section of Upper Paleozoic sandstones from southern Transdanubia (Mecsek-Villány area, Tisza mega-unit, Hungary) has been analyzed for major and trace elements, including rare earth elements (REEs).
Á, Arribas, Awdankiewicz, Balogh, Bauluz, Bhatia, Bhatia, Biscaye, Brü, Cox, Csontos, Csontos, Csontos, Cullers, Cullers, Fazekas, Fedo, Gaillardet, Garver, Golonka, Haas, Huang, Kü, Lee, Nagy, Nesbitt, Noda, Pearce, Preston, Varga, Varga, Varga, Varga, Watanabe, Willan, Zimmermann   +35 more
core   +1 more source

Relation of lineaments and volcano-stratigraphy of tertiary volcanic rocks in Kulon Progo Mountains Area, Yogyakarta-Indonesia

E3S Web of Conferences, 2019
The structural lineaments developed in the Kulon Progo Mountains, which is mainly composed of Tertiary volcanic rocks. The direction and distribution of these lineaments density differs from one area to another.
Widagdo Asmoro, Pramumjoyo Subagyo, Harijoko Agung   +2 more
doaj   +1 more source

Effect of nanoparticle of volcanic ash and rock phosphate on some soil chemical properties of variable charge Andisols, Indonesia

Soil & Environment, 2018
Andisols is a variable charge soil where fertilizations to the soil do not give the same result as that to the soils with permanent charges. Therefore, amelioration is needed to improve the soil chemical properties.
Mahfud Arifin, Rina Devnita, Ade Setiawan, Apong Sandrawati, Nenny Nurlaeny , Anne Yuliana   +5 more
doaj   +1 more source