Results 41 to 50 of about 123,575 (347)

Granites and granites in the East Greenland Caledonides

, 2008
Caledonian (435-425 Ma) and "Grenvillian" (950-900 Ma) S-type leucogranites and augen gneisses are prominent in the thrust units that form the southern half of the East Greenland Caledonian orogen, south of 76°N.
Kalsbeek, Feiko, Higgins, A. K., Jepsen, Hans, Frei, Robert, Nutman, Allen Phillip   +4 more
openaire   +2 more sources

Late Neoarchean potassic high Ba-Sr granites in the Taishan granite-greenstone terrane: Petrogenesis and implications for continental crustal evolution

, 2013
A series of Late Neoarchean high Ba–Sr granites with a potassium-rich signature has been identified from the Taishan granite–greenstone terrane (TSGT), within the Eastern Block of the North China Craton (NCC).
Fan, W., Peng, T., Peng, Touping, Peng, B., Peng, Bingxia, Wilde, Simon A., Fan, Weiming, Wilde, Simon   +7 more
core   +1 more source

Numerical investigation on the influence of mesoscopic deformation on contact area and hydraulic aperture to fracture seepage

Deep Underground Science and Engineering, EarlyView.
Fluid flow through a single fracture is commonly described by the cubic law. However, deviations from this model are expected because natural fracture surfaces are rough and in contact with each other in discrete regions. In this study, the interactions between fracture closure, contact area, and hydraulic characterization of mesoscopic‐scale rough ...
Chenghao Han, Yuanlin Bai, Weijie Zhang, Jicheng Zhang, Hongfa Ma, Weiye Li   +5 more
wiley   +1 more source

Igneous and metamorphic processes in the Shap Granite and its aureole [PDF]

, 1986
The Shap Granite outcrops in eastern Cumbria, N.W. England and is a post—orogenic granite intruded during the Lower Devonian (ie 394 Ma) into rocks of Ordovician to Siturian age.
Caunt, Stephen Lloyd
core  

Review and prospects of shear test of bolted rock joints

Deep Underground Science and Engineering, EarlyView.
The laboratory shear test equipment, test method, and numerical simulation of bolted rock joints were summarized. The shortcomings and limitations of the current research were analyzed, and the research prospects were proposed. Abstract Rock bolting is a critical approach in geotechnical engineering for supporting weak rocks.
Shulin Ren, Fan Yang, Manchao He, Yong Yuan, Zhigang Tao   +4 more
wiley   +1 more source

A review on rockburst prediction and prevention to shape an ontology‐based framework for better decision‐making for underground excavations

Deep Underground Science and Engineering, EarlyView.
A scientometric analysis of 2449 journal articles and a comprehensive review of 336 papers were conducted, discussing and identifying challenges and research gaps in rockburst prediction and prevention and proposing an ontology‐based framework for better decision‐making in underground excavations. Abstract With underground engineering projects becoming
Hongchuan Yan, Haijiang Li, Hongqiang Xie, Mingli Xiao, Jianliang Pei, Huaizhong Liu, Jiangda He   +6 more
wiley   +1 more source

Magnetic mineralogy of Variscan granites from northern Portugal: an approach to their petrogenesis and metallogenic potential

Geologica Acta, 2020
Northern Portugal is characterized by the occurrence of numerous W hydrothermal deposits spatially associated with granites. The primary goal of this work is to establish a relationship between the magnetic behavior of the granites and the redox ...
C. Cruz, H. Sant’Ovaia, F. Noronha
doaj   +3 more sources

PETROGENETIC MODELING OF SOME GRANITIC MASSES IN THE CENTRAL EASTERN DESERT, EGYPT [PDF]

Delta Journal of Science, 2007
Three granitic masses, namely Gabal Dellihimmi (140 km2), Gabal Abu Tiyur (30 km2) and Gabal Um Shaddad (17 km2) are located in the central Eastern Desert, intruded older metavolcanics and metasediments.
A.I. Ragab, A.M. El Sherif, E. M. M. El-Husseiny, A. A., Moussa, Abd El Wahed   +4 more
doaj   +1 more source

Investigation on hard‐rock breaking performance and auxiliary mechanism of picks assisted with both‐sided high‐pressure water jets

Deep Underground Science and Engineering, EarlyView.
This paper investigates the high‐pressure water jet‐pick combined rock‐breaking mode (HPC), which employs high‐pressure water jets to precut grooves on both sides of the picks. The rock‐breaking patterns and performance of the HPC method are obtained, and the auxiliary rock‐breaking mechanism of water jet grooving is revealed.
Jingjing Lu, Jiancheng Xiao, Hui Zhou, Xiao Ma, Congcong Hou, Jian Cui, Fujian Yang   +6 more
wiley   +1 more source

Intraplate crustal remelting as the genesis of Jurassic high-K granites in the coastal region of the Guangdong Province, SE China

, 2013
The origin and tectonic significance of high-K granites (>3 wt% K2O at 70 wt% SiO2), calc-alkaline I-type granites in particular, remain controversial.
Li, Xian-Hua, Li, Zheng-Xiang, Li, W., Huang, Hui-Qing, Li, Wu-Xian, Li, X.   +5 more
core   +1 more source