Results 61 to 70 of about 19,778 (275)

Vein formation of the Monchepluton and the Monchetundra intrusion contact zone

Vestnik MGTU, 2022
The Monchegorsk region (Kola Peninsula) is distinguished by its platinum metal specialization and is a promising target for prospecting and exploration of valuable, strategically important platinum group metals.
Miroshnikova Ya. A.
doaj   +1 more source

Geochemistry and Geochronology of Magmatic Rocks in Southwestern and Northeastern Cambodia: Implications for the Tectonic Evolution and Metallogenesis of the Loei Fold Belt

Geological Journal, EarlyView.
The composition of intrusive rocks suggests that the magma was likely generated in a subduction‐related setting. The arc crustal thickness in the Phnom Sro Ngam and Halo Prospects was probably < 40 km during emplacement. Zircon U–Pb age range indicates a correlation with Loei Fold Belt magmatic activity.
Sirisokha Seang, Khin Zaw, Kakda Kret, Ivan Belousov, Kotaro Yonezu, Koichiro Watanabe, Charles Makoundi   +6 more
wiley   +1 more source

Petrogenesis of Plagioclase Ultraphyric Basalts (PUB) From the Northeastern (NE) Pacific Ridge System: Evidence From Mineral Textures and Geochemical Characteristics

Geochemistry, Geophysics, Geosystems
Plagioclase crystals in plagioclase ultraphyric basalts (PUB) record changes in the major, trace, and isotopic compositions of evolving magmas. Those changes represent the record of specific processes in the crust and upper mantle that impart distinct ...
John B. Hewitt, Gokce K. Ustunisik, Roger L. Nielsen   +2 more
doaj   +1 more source

Chemical Evolution of Intercumulus Liquid, as Recorded in Plagioclase Overgrowth Rims from the Skaergaard Intrusion

The intercumulus liquid of a crystal mush fills pore spaces, and typically solidifies to form overgrowths on cumulus grains and poikilitic post-cumulus minerals.
Humphreys, M. C. S.
core   +1 more source

(Table 1) Geochemistry of plagioclase of ODP Hole 183-1137A Unit 4 basalts

, 2009
(Table 1) Geochemistry of plagioclase of ODP Hole 183-1137A Unit 4 ...
Neal, Clive R, William S Kinman (6973790), Clive R Neal (6968849), Jon P Davidson (6973793), Font, Laura, Kinman, William S, Davidson, Jon P, Laura Font (567207)   +7 more
core   +1 more source

Late Pleistocene Volcanic Rocks From Tengchong Volcanic Field at SE Tibetan Plateau: Constraints on Petrogenesis and Mantle and Crustal Processes

Geological Journal, EarlyView.
Early zircon saturation and crystallisation occur in mafic (52–54 wt.% SiO2) lavas at Tengchong volcanic field. These early formed zircons with high δ18O (6.6‰–7.9‰) indicates mantle enrichment by subducted supracrustal materials. ABSTRACT Late Pleistocene (< 0.2 Ma) mafic and evolved volcanic rocks occur in northern Tengchong Volcanic Field, SE ...
Lizhu Wang, Haibo Zou
wiley   +1 more source

Mineral associations in the rocks and metamorphism conditions of the Kandalaksha gabbro-anorthosite massif (Kola Peninsula)

Литосфера, 2016
The composition of mineral associations was studied in the main varieties of the rocks within the metamorphosed Kandalaksha gabbro-anorthosite massif in the southern part of the Kola Peninsula.
V. V. Chashchin, E. N. Steshenko, Ye. E. Savchenko, Ya. A. Pakhomovsky, A. V. Bazai   +4 more
doaj   +2 more sources

Testing the Recycled Gabbro Hypothesis for the Origin of “Ghost Plagioclase” Melt Signatures Using 87Sr/86Sr of Individual Olivine‐Hosted Melt Inclusions From Hawai'i

Geochemistry, Geophysics, Geosystems, 2021
Melt inclusions with large, positive Sr anomalies have been described in multiple tectonic settings, and the origins of this unusual geochemical feature are debated.
O. E. Anderson, M. G. Jackson, E. F. Rose‐Koga, J. P. Marske, M. E. Peterson, A. A. Price, B. L. Byerly, A. A. Reinhard   +7 more
doaj   +1 more source

Farming in the shadows of Rome: A multi‐proxy palaeoenvironmental record from Loch Clunie—Perthshire

Journal of Quaternary Science, EarlyView.
ABSTRACT Roman impacts on local society is a subject of international significance. Loch Clunie, Perthshire, lies only 5.4 km from Inchtuthil, the only Roman legionary fortress in Scotland, and contains two crannogs and a probable lakeside hillfort. Despite this proximity and the likelihood of local–Roman interaction, these sites remain unexcavated ...
Samantha E. Jones, Maarten Blauuw, Fraser Hunter, Olalla López‐Costas, Antonio Martínez Cortizas, Tim M. Mighall, Gordon Noble   +6 more
wiley   +1 more source

(Table 2) Geochemistry of plagioclase of ODP Hole 183-1137A Unit 10 basalts

, 2009
(Table 2) Geochemistry of plagioclase of ODP Hole 183-1137A Unit 10 ...
Neal, Clive R, William S Kinman (6973790), Clive R Neal (6968849), Jon P Davidson (6973793), Font, Laura, Kinman, William S, Davidson, Jon P, Laura Font (567207)   +7 more
core   +1 more source