Results 21 to 30 of about 3,682 (259)

Multistage origin of dunite in the Purang ophiolite, southern Tibet, documented by composition, exsolution and Li isotope characteristics of constituent minerals [PDF]

European Journal of Mineralogy, 2020
The Purang ophiolite, which crops out over an area of about 650 km2 in the western Yarlung–Zangbo suture zone, consists chiefly of mantle peridotite, pyroxenite and gabbro.
F. Xiong, F. Xiong, J. Yang, H.-P. Schertl, H.-P. Schertl, Z. Liu, X. Xu   +6 more
doaj   +1 more source

Hydrothermal Chromitites from the Oman Ophiolite: The Role of Water in Chromitite Genesis

Minerals, 2020
The role of water-rich solutions in the formation of chromitites has been the matter of controversy. We found small chromite concentrations (chromitites) in diopsidites, precipitated from high-temperature hydrothermal fluids, in the mantle to the crust of the Oman ophiolite. Here, we present petrologic characteristics of the hydrothermal chromitites to
Shoji Arai, Makoto Miura, Akihiro Tamura, Norikatsu Akizawa, Akira Ishikawa   +4 more
openaire   +1 more source

Integrated geophysical methods for boulder delineation to improve mining

Geophysical Prospecting, Volume 71, Issue 7, Page 1226-1246, September 2023., 2023
Abstract Near‐surface boulders can pose serious challenges to opencast mining. They often introduce complexities, delays in drilling, blasting and excavation programmes, which subsequently decrease mining efficiency, increase mining risks and costs. The location of subsurface boulders and the identification of other geological features that may impact ...
Sikelela Gomo, Moyagabo K. Rapetsoa, Musa S. D. Manzi, Emmanuel Onyebueke, Jureya Dildar, Mpofana Sihoyiya, Ndamulelo Mutshafa, Wesley Harrison, Julie E. Bourdeau, Oleg Brovko, Ian James, Gordon R. J. Cooper, Stephanie Scheiber, Raymond J. Durrheim   +13 more
wiley   +1 more source

Highly refractory Archaean peridotite cumulates: Petrology and geochemistry of the Seqi Ultramafic Complex, SW Greenland [PDF]

, 2017
This paper investigates the petrogenesis of the Seqi Ultramafic Complex, which covers a total area of approximately 0.5 km2. The ultramafic rocks are hosted by tonalitic orthogneiss of the ca.
Arai, Arndt, Arndt, Asmund, Ballhaus, Ballhaus, Barnes, Barnes, Barnes, Barnes, Becker, Begg, Bennett, Bernstein, Bernstein, Bernstein, Bernstein, Bodinier, Brey, Bridgwater, Burns, Bédard, Cameron, Cameron, Cawthorn, Christiansen, Christiansen, Colás, Connolly, Dahl, de Hoog, DeBari, Diener, Downes, Dyck, Dziggel, Eales, Evans, Fiorentini, Frei, Friend, Friend, Friend, Furnes, Ganne, Gannoun, Garde, Garde, Garde, Garde, Gerdes, Groves, Grégoire, Hanghøj, Hanmer, Harris, Hattori, Hattori, Hattori, Hawthorne, Herzberg, Holland, Huber, Irvine, Irvine, Irvine, Jackson, Janošek, Jenner, Jenner, Jennings, Kelemen, Keulen, Kisters, Kolb, Kristensen, Kusky, Lenaz, Liermann, Lindsley, Lindsley, Ludwig, Luguet, Mai, Maier, Maier, Maier, Mathison, Maurel, McBirney, McBirney, McCallum, McCallum, McDonald, Myers, Naldrett, Nielsen, Niu, Nutman, Nutman, Otamendi, Pagé, Pagé, Pal, Palme, Paton, Pearson, Pearson, Petrus, Polat, Polat, Polat, Polat, Povdin, Prescher, Quintiliani, Rais, Robin-Popieul, Roeder, Rollinson, Rollinson, Rollinson, Rollinson, Rollinson, Rosengren, Révillon, Spandler, Streckeisen, Streckeisen, Szilas, Szilas, Szilas, Szilas, Szilas, Szilas, Szilas, Szilas, Szilas, Szilas, Szilas, Szilas, Szilas, Søndergaard, Terentiev, Thakurta, Tiepolo, Wager, Wan, Wang, Warren, Witt-Eickschen, Wittig, Wittig, Wooden, WSU, Zhao, Zientek   +156 more
core   +6 more sources

The Central Series of the Rum Igneous Complex, NW Scotland: the rises and falls of magma in a large mafic‐ultramafic volcano

Geology Today, Volume 39, Issue 4, Page 130-143, July/August 2023., 2023
The Central Series of the Paleocene mafic to ultramafic Rum complex is the youngest of the three main cumulate series that make up the layered igneous complex of this famed Scottish island. The Central Series lies along the Long Loch Fault and provides insights into the feeder system to the Rum intrusion at an erosion level of about two kilometres ...
Brian G.J. Upton, Valentin R. Troll, C. Henry Emeleus, Colin H. Donaldson   +3 more
wiley   +1 more source

Formation and Evolution of Chromitites in the Hongshishan Complex, Beishan Orogenic Collage, NW China: Constraints from Mineralogical Compositions, Re‐Os Isotopes and Platinum‐Group Element Geochemistry

Acta Geologica Sinica - English Edition, Volume 97, Issue 3, Page 727-743, June 2023., 2023
Abstract The Hongshishan chromitite deposits are situated to the north of the Beishan orogenic collage, in the southern part of the Central Asian Orogenic Belt. This study describes the mineral chemistry, Re‐Os isotopes and platinum‐group elements geochemistry of the Hongshishan chromitites for the purpose of constraining the origin, evolution and ...
Zhaolin WANG, Jiayong YAN, Xiaoming ZHENG, Hejun TANG, Lulu YUAN, Zhen DENG, Tonghui FANG   +6 more
wiley   +1 more source

Polyphase tectonic reworking of serpentinites and chlorite‐tremolite‐talc rocks (SW Spain) from the subduction forearc to intracontinental emplacement

Journal of Metamorphic Geology, Volume 41, Issue 4, Page 491-523, May 2023., 2023
Abstract The petrostructural and geochronological study of a poorly known ultramafic unit from SW Spain (Badajoz–Córdoba belt) combined with previous structural data permits disclosure of a history of metasomatism, tectono‐metamorphism, reworking and isotopic resetting related to a poly‐orogenic evolution in different geodynamic scenarios.
Benito Ábalos, Pablo Puelles, José Ignacio Gil Ibarguchi   +2 more
wiley   +1 more source

西南日本の熱変成超苦鉄質岩体中のかんらん石と輝石の組成変化に関する覚書 [PDF]

, 2010
This short article presents some diagrams showing the compositional variations of primary and metamorphic olivine, orthopyroxene and clinopyroxene in peridotites and serpentinites from thermally metamorphosed ultramafic complexes in SW Japan. In contrast
Nozaka, Toshio
core   +1 more source

Genetic Link between Podiform Chromitites in the Mantle and Stratiform Chromitites in the Crust: A Hypothesis [PDF]

Minerals, 2021
No genetic link between the two main types of chromitite, stratiform and podiform chromitites, has ever been discussed. These two types of chromitite have very different geological contexts; the stratiform one is a member of layered intrusions, representing fossil magma chambers, in the crust, and the podiform one forms pod-like bodies, representing ...
openaire   +1 more source

Chromite in the mantle section of the Oman Ophiolite: Implications for the tectonic evolution of the Oman Ophiolite [PDF]

, 2015
Chromite in the Oman ophiolite is located in the mantle section of the ophiolite sequence and forms abundant small podiformdeposits throughout the length of the ophiolite (Rollinson, 2005).The Oman ophiolite has an exposed mantle section of ca 10 000 km2,
Adetunji, Borisova, Boudier, Ceuleneer, Hanghøj, Matveev, Michibayashi, Nicolas, Pearce, Rollinson, Rollinson, Rollinson, Rollinson, Schiano, Whattam   +14 more
core   +1 more source