Results 31 to 40 of about 2,212 (216)

Magnetite and ilmenite from some Finnish rocks [PDF]

Bulletin of the Geological Society of Finland, 1972
Coexisting accessory magnetite and ilmenite -were separated and chemically analysed from five Finnish Precambrian rocks: anorogenic olivine diabase and gabbroanorthosite as well as three metamorphosed Svecofennian quartz diorites.
I. Haapala, P. Ojanperä
doaj   +1 more source

Petrographical characteristics of Ditró (Orotva) diorites, Eastern Carpathians, Transylvania (Romania) [PDF]

, 1994
One of the most important rock groups outcropping in the NW part of the Ditró syenite massif, north of the Orotva creek and between the Csibi Jakab and Tászok creeks is the group of the dioritic rocks. On the basis of the mineralogical composition, color
Pál Molnár Elemér
core  

Steel segment–anchor bolt (cable) structure for TBM tunnels under extremely intense rockburst conditions: Design method and field application

Deep Underground Science and Engineering, EarlyView.
The graphical abstract presents a steel segment–anchorage support system for open TBM tunnels under extremely intense rockburst conditions. The steel segment resists dynamic impact, while the anchorage structure restrains segment deformation and transfers loads into the rock.
Zhijun Li, Pan Gao, Zhifan Xu, Zhilong Wang, Mingnian Wang   +4 more
wiley   +1 more source

Petrogenesis and tectonic setting of late Paleoproterozoic diorites in the Trans-North China Orogen [PDF]

Solid Earth
Unravelling the tectonic setting and evolution of cratons during the late Paleoproterozoic has long been a major focus of geological research. As one of Earth's major cratonic blocks, the North China Craton (NCC) preserves extensive magmatism during this
Z. Wang, Z. Wang, J. He, W. Siebel, S. Tang, Y. Ji, J. He, F. Chen   +7 more
doaj   +1 more source

Notable Impact of Paleotectonic Stress on Gold Mineralisation in the West Qinling Orogen

Geological Journal, EarlyView.
By applying fuzzy clustering and multiple inverse methods, we systematically processed the data of vein and fault slip in this ore deposit to reveal the transition of orogenic geological environment and paleotectonic stress field. Our research results show two different stress states: the northwest–southeast extensional stress field and the northeast ...
Hongyan Wang, Aibing Chen, Jian Yang, Yuan Zhang   +3 more
wiley   +1 more source

Karagaikul gold-porhyric ore occurrence (South Urals): geochemistry and petrogenesis of intrusive rock, composition of minerals of near-ore metasomatites and ores

Georesursy
The petrological and geochemical characteristics of intrusive rocks, sources of magmatic melts, as well as the composition of minerals of near-ore metasomatites and ores of the Karagaikul gold-porphyry ore occurrence located in the Main Ural fault zone ...
S. E. Znamensky, A. M. Kosarev, G. T. Shafigullina   +2 more
doaj   +1 more source

Petrology of Yaluninogorsk granitoid massive (Alapaevsk-Sukhoi Log porphyry copper zone, Middle Urals)

Литосфера, 2018
Yaluninogorsk quartz diorite-trondhjemite massif is situated in Alapaevsk-Sukhoy Log zone of Eastern-Ural High potentially productive for Cu (±Mo) porphyry type of mineralization. The massif is a magma chamber 3 × 2 km under central type volcano.
Sergei V. Pribavkin, Irina A. Gottman, Anatolii V. Korovko   +2 more
doaj   +1 more source

Early Cretaceous volcanic-arc magmatism in the Dalat-Kratie Fold Belt of eastern Cambodia: implications for the lithotectonic evolution of the Indochina terrane

Frontiers in Earth Science, 2023
Mesozoic granitic plutons are found throughout the Indochina terrane of eastern Cambodia and southern Vietnam. The granitic rocks range in age from Early Triassic (240 Ma) to Late Cretaceous (80 Ma) and record distinct tectonomagmatic periods associated ...
J. Gregory Shellnutt, George S.-K. Ma, Jacky S.-L. Chan, Jean P.-M. Wong, Kuo-Lung Wang   +4 more
doaj   +1 more source

Supplemental Material: Two magma fractionation paths for continental crust growth: Insights from the adakite-like and normal-arc granites in the Ailaoshan fold belt (SW Yunnan, China)

, 2022
Figure S1: Primitive mantle-normalized multi-element diagrams for hornblende diorites and cumulative diorites. Figure S2: SiO2 vs. Sr/Y (A) and La/Yb (B) plots for adakite-like rocks formed by partial melting of lower continental crust, showing no binary
Xiaoping Xia (6846810), Jian Xu (31545), et al. (281964)   +2 more
core   +1 more source

Creation of a Landslide Susceptibility Map Using Short‐Term Data From the July 2018 Heavy Rainfall in Southern Hiroshima Prefecture

Geological Journal, EarlyView.
This work advances landslide susceptibility mapping by incorporating short‐term trigger data with landscape susceptibility mapping. We also examine the importance of downsampling, watershed delineation and geospatial correlations in evaluating outcomes.
Kanta Kotsugi, Ting Liu, Toshiro Hata, Rebecca Muenich   +3 more
wiley   +1 more source