Results 61 to 70 of about 136,558 (327)

Real‐time lithology identification while drilling based on drill cuttings image analysis with ensemble learning

Deep Underground Science and Engineering, EarlyView.
A lithology identification while drilling method was developed, integrating an automated cuttings sampling system, a smart drilling rig, and an ensemble learning model. Underground trials achieved 97.42% accuracy in real‐time identification of cuttings lithology and composition, enhancing hazard management and supporting unmanned drilling technology in
Kun Li, Ting Ren, Ningping Yao, Jon Roberts, Haitao Song, Zhongbei Li, Xueqiu He, Liang Zhao   +7 more
wiley   +1 more source

Geology and geochemistry of the Eocene zeolite bearing volcaniclastic sediments of Metaxades, Thrace, Greece

Estudios Geologicos, 1995
Los sedimentos eocenos volcanoclásticos con zeolita (51% de media de clinoptilolita rica en Ca) de Metaxades, Tracia, Grecia, se estudian desde el punto de vista geológico y de su composición química. Las formaciones alternantes que se pueden observar en
Th. Koutles, A. Kassoli-Fournaraki, A. Filippidis, A. Tsirambides   +3 more
doaj   +1 more source

Petrology and Volcano-Stratigraphy of The Muria-Peninsula High-K Volcanic Rocks, Central Java, Indonesia

JGEET: Journal of Geoscience, Engineering, Environment and Technology, 2022
The Muria-Peninsula is a Quaternary volcano located in the northern Sunda arc. Its activity was controlled under high potassic and very high potassic magma series resulting in leucite-rich trachyte and pyroxene-rich basaltic-andesite. It is a strato-type
Sri Mulyaningsih, Sutikno Bronto, Arie Kusniadi, Lilis Apriyanti, L. Budiyanto, Danis Agoes Wiloso   +5 more
doaj   +1 more source

An ion probe study of the sulphur isotopic composition of Fe-Ni sulphides in CM carbonaceous chondrites [PDF]

, 2004
From the Introduction: The CM chondrites have endured variable degrees of aqueous alteration [1] which has changed their original mineralogy. A detailed study of the petrology and mineralogy of the sulphides in a suite of increasingly aqueously altered ...
Bullock, E. S., Gounelle, M., Grady, M. M., McKeegan, K. D., Russell, S. S.   +4 more
core   +1 more source

Recycling Argon through Metamorphic Reactions: the Record in Symplectites [PDF]

, 2018
The 40Ar/39Ar ages of metamorphic micas that crystallized at high temperatures are commonly interpreted as cooling ages, with grains considered to have lost 40Ar via thermally-driven diffusion into the grain boundary network.
Allaz, Anderson, Anderson, Baxter, Beltrando, Berry, Blundy, Bryhni, Christopher S. McDonald, Clare J. Warren, Connolly, Cuthbert, Dale, Daniele Regis, de Sigoyer, Di Vincenzo, Dodson, Dransfield, Engvik, Eskola, Frost, Fuhrman, Gee, Gilotti, Godard, Groppo, Hacker, Hacker, Hacker, Hacker, Heinrich, Holland, Holland, Holland, Holland, Holland, Holland, Johnson, Kellett, Krogh, Kylander-Clark, Kylander-Clark, Labrousse, Li, Li, Lux, McDonald, Mulch, Peterman, Putlitz, Renne, Roberts, Root, Root, Sarah C. Sherlock, Schmidt, Schärer, Sherlock, Simon P. Kelley, Smith, Spencer, Tajcmanová, Terry, Terry, Tucker, Villa, Villa, Wain, Wain, Walsh, Walsh, Walsh, Warren, Warren, Warren, Watson, Wheeler, White, White, Whitney, Young, Young, Young   +82 more
core   +2 more sources

The damage and failure mechanism of prestatically loaded rock during medium‐strain rate cyclic impact loading

Deep Underground Science and Engineering, EarlyView.
Based on experimental results and theoretical analysis, an established rock damage accumulation model that comprehensively considers the preapplied static load, impact peak value, impact frequency, and impact times. Abstract To study the rock damage mechanism under high static loading and superimposed medium strain rate cyclic impact loading, a series ...
Wei Wang, Hanpeng Wang, Zicheng Wang, Xinyuan Xie, Yunhao Wu, Jinhou Zhang, Dekang Sun   +6 more
wiley   +1 more source

A non-classical view on calcium oxalate precipitation and the role of citrate

Nature Communications, 2017
The formation mechanism of abundant calcium oxalate biomaterials is unresolved. Here the authors show the early stages of calcium oxalate formation in pure and citrate-bearing solutions by using a titration set-up in conjunction with solution quenching ...
Encarnación Ruiz-Agudo, Alejandro Burgos-Cara, Cristina Ruiz-Agudo, Aurelia Ibañez-Velasco, Helmut Cölfen, Carlos Rodriguez-Navarro   +5 more
doaj   +1 more source

Preliminary results on degree of thermal alteration recorded in the eastern part of Mt. Papuk, Slavonia, Croatia

Geologia Croatica, 2011
In order to improve present knowledge of metamorphic conditions to which rocks of the Mt. Papuk have been subjected, selected samples belonging to the Radlovac metamorphic complex as well as overlying sedimentary rocks and parts of Psunj metamorphic ...
Vanja Biševac, Dražen Balen, Darko Tibljaš, Darko Španić   +3 more
doaj   +1 more source

The lithospheric mantle and lower crust-mantle relationships under Scotland: a xenolithic perspective [PDF]

, 2011
In the British Isles the majority of volcanic rocks containing upper mantle and lower crustal xenoliths occur in Scotland. Most of the occurrences are of Carboniferous–Permian age.
Arai, B.G.J. Upton, Bonadiman, C. Bonadiman, Greenbaum, Griffin, H. Downes, Irving, Johnson, Kirstein, L.A. Kirstein, Larsen, Macdonald, McDonough, Menzies, P.G. Hill, Singh, T. Ntaflos   +17 more
core   +1 more source

Critical expansion points: Mechanical signs of surrounding rock instability

Deep Underground Science and Engineering, EarlyView.
This study proposes the Rock Bearing‐Expansion Model (RockBEM) with critical expansion points (CEPs) to quantify post‐peak damage stages in deep‐buried rock masses via plane strain compression test (PSCT). CEP hysteresis&interval ratios reveal bearing performance dynamics and failure severity, advancing mechanistic insights into deep underground rock ...
Jiaqi Wen, Chang Deng, Haijun Wang, Lei Tang, Jihong Yu   +4 more
wiley   +1 more source