Results 71 to 80 of about 2,839,750 (318)

Lead, zinc and copper mineralisation in basal Carboniferous sediments at Westwater, south Scotland [PDF]

, 1977
A zioneo f lead, zinc and copperm ineralisatioins developedo ver a minimum I of 4 km of strikeo f basal Carboniferoucse mentstoneg roup sedimentsa nd immediatelyu nderlyingB irrenswarkL avas atwestwater,n ear Laqholm in south Scotland.
Davies, A., Easterbrook, G.D., Fortey, N.J., Gallagher, M.J., Parker, M.E., Smith, R.T.   +5 more
core  

Testing the ureilite projectile hypothesis for the El'gygytgyn impact: determination of siderophile element abundances and Os isotope ratios in ICDP drill core samples and melt rocks [PDF]

, 2013
The geochemical nature of the impactites from International Continental Scientific Drilling Project-El'gygytgyn lake drill core 1C is compared with that of impact melt rock fragments collected near the western rim of the structure and literature data ...
Abe, Alvarez, Anderson, Bell, Belyi, Binzel, Bogard, Buchwald, Burbine, Claeys, Collins, Dabizha, Doerffel, Evans, Feldman, Foriel, Gaffey, Gebhardt, Gelinas, Glushkova, Goderis, Goderis, Goderis, Goderis, Govindaraju, Grieve, Gurov, Gurov, Gurov, Gurov, Gurov, Gurov, Hall, Hassler, Heiken, Hutchison, Jenniskens, Kenkmann, Koeberl, Koeberl, Koeberl, Koeberl, Korotev, Kyte, Kyte, Layer, Maier, Marti, McDonald, McDonald, McDonough, Meisel, Meisel, Melles, Melles, Melles, Morgan, Morgan, Nakamura, Nowaczyk, Palme, Palme, Palme, Palme, Palme, Pernicka, Peucker-Ehrenbrink, Pieters, Plessen, Rankenburg, Raschke, Rollinson, Schmidt, Schmidt, Shukolyukov, Sigurdsson, Simonson, Smit, Stone, Tagle, Tagle, Tagle, Tagle, Tagle, Taylor, Trinquier, Va'lter, Warren, Wasson, Wedepohl, Weisberg, Wittmann, Wolf, Yurimoto, Zolensky   +94 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

Well-Logging-Based Lithology Classification Using Machine Learning Methods for High-Quality Reservoir Identification: A Case Study of Baikouquan Formation in Mahu Area of Junggar Basin, NW China

Energies, 2022
The identification of underground formation lithology is fundamental in reservoir characterization during petroleum exploration. With the increasing availability and diversity of well-logging data, automated interpretation of well-logging data is in ...
Junlong Zhang, Youbin He, Yuan Zhang, Weifeng Li, Junjie Zhang   +4 more
doaj   +1 more source

Sequence stratigraphy, chemostratigraphy and facies analysis of Cambrian Series 2 – Series 3 boundary strata in northwestern Scotland [PDF]

, 2016
Globally, the Series 2 – Series 3 boundary of the Cambrian System coincides with a major carbon isotope excursion, sea-level changes and trilobite extinctions.
Faggetter, Luke, FAGGETTER, LUKE E., Joachimski, Michael, JOACHIMSKI, MICHAEL M., NEWTON, ROBERT J., Pruss, Sara, PRUSS, SARA B., Raine, Robert, RAINE, ROBERT J., Smith, Paul, SMITH, PAUL M., SUN, YADONG, WIDDOWSON, MIKE, Wignall, P B, WIGNALL, PAUL B.   +14 more
core   +1 more source

Gaborlet‐guided sparse filtering: A novel intelligent method for lithology identification by vibration signals while drilling

Deep Underground Science and Engineering, EarlyView.
The flowchart illustrates rock specimen testing, vibration signal acquisition, and feature extraction with Gaborlet and sparse filtering for classification. Abstract Traditional lithology identification methods mainly rely on core sampling and well‐logging data.
Jian Hao, Danqi Zhang, Zhenqi Song, Jinrui Wang, Qi Wang, Heqing Liu   +5 more
wiley   +1 more source

The tectonic influence on the last 1500-year infill history of a deep lake located on the North Anatolian Fault: Lake Sapanca (N-W Turkey) [PDF]

, 2010
Lake Sapanca on the North Anatolian Fault zone (NW Turkey) is a pull-apart basin at the junction between the İzmit-Sapanca fault segment, the Sakarya segment and the westernmost end of the Mudurnu Valley fault.
Costa, PJM, Leroy, SAG, Schwab, MJ
core  

A semi-supervised coarse-to-fine approach with bayesian optimization for lithology identification

Earth Science Informatics, 2023
Lithology identification is critical in the interpretation of well-logging data for petroleum exploration and development. However, the limited availability of labeled well-logging data for machine learning model training can lead to compromised accuracy
Yunxin Xie, Liang Jin, Chenyang Zhu, Siyu Wu   +3 more
semanticscholar   +1 more source

Fracture evolution of a thick soft protection layer and the water inrush mechanism in overburden under longwall mining

Deep Underground Science and Engineering, EarlyView.
Through shear–tensile creep tests and viscoelastic modeling, the fracture evolution of thick soft protective layers is clarified. Results show thickness‐dependent rheological failure modes that govern four types of roof water inrush, providing a mechanism‐based framework for hazard prediction and control. Abstract In the Jurassic coal‐bearing strata of
Mengnan Liu, Wei Qiao, Xianggang Cheng, Xiangsheng Meng, Peichao Feng   +4 more
wiley   +1 more source

Textural and Lithologic Differences of Cretaceous, Tertiary, and Quaternary Gravels of South Arkansas [PDF]

, 1987
Stream gravels have been derived from the Ouachita Mountains since at least Cretaceous times. Past studies have assigned ages to gravel deposits in the basins of the Saline and Little Missouri Rivers on the basis of altitude above local floodplains. This
Wood, Lesli
core   +2 more sources