Results 81 to 90 of about 1,350 (208)

Lithospheric Unzipping Explaining Hot Orogenesis During Continental Subduction

Tectonics, Volume 44, Issue 7, July 2025.
Abstract Phanerozoic accretionary orogens typically contain upper crustal nappes derived from subducted lithosphere—oceanic or continental—that display (ultra‐)high‐pressure, low‐temperature ((U)HP‐LT) metamorphism. Surprisingly, such orogens often also contain coeval continent‐derived nappes that underwent “Barrovian” (MP‐HT) syn‐burial metamorphism ...
Douwe J. J. van Hinsbergen, Thomas N. Lamont, Carl Guilmette   +2 more
wiley   +1 more source

GEOCHRONOLOGY OF ULTRAMAFIC LAMPROPHYRE DIKES IN THE TOMTOR COMPLEX

Геодинамика и тектонофизика
This work studies thin ultramafic lamprophyre (UML) dikes associated with the Tomtor alkaline-ultramafic massif (Arctic Siberia). 40Ar/39Ar dating yielded an emplacement age of 710 Ma for the dikes.
S. V. Malyshev, E. A. Gladkochub, A. A. Karimov, A. V. Ivanov, A. M. Pasenko, A. A. Shalamova, D. R. Sitkina, A. V. Travin, N. V. Bryanskiy   +8 more
doaj   +1 more source

Petrogenetic processes, crystallization conditions and nature of the Lower-Oligocene calc-alkaline spessartitic lamprophyres from Kal-e-kafi area (East of Anarak, Isfahan province)

Journal of Economic Geology, 2017
Introduction Lamprophyres are mesocratic to melanocratic igneous rocks, usually hypabyssal, with a panidiomorphic texture and abundant mafic phenocrysts of dark mica or amphibole (or both) with or without pyroxene, with or without olivine, set in a ...
Gholam Hossain Nazari , Ghodrat Torabi
doaj   +1 more source

A note on the origin of Clinopyroxene megacrysts from the Udiripikonda lamprophyre, Eastern Dharwar Craton, southern India

, 2017
Abundant sub-rounded to sub-angular and centimeter-sized clinopyroxene megacrysts constitute a conspicuous feature of the Udiripikonda lamprophyre, located in the Eastern Dharwar craton, Southern India.
Chalapathi Rao, N. V., Pandit, Dinesh, Pandey, Ashutosh, Pankaj, Praveer, Pandey, Rohit   +4 more
core  

Microprobe analyses of biotite from the Datong lamprophyres. Origin of lamprophyres from the northern margin of the North China Craton: implications for mantle metasomatism

, 2016
File 2.
Bin Chen (63682), Xiaolu Niu (3341282), Guangying Feng (3341279), Jingsui Yang (3341276), Fei Liu (21082)   +4 more
core   +1 more source

Simultaneous Free Flow and Forcefully Driven Movement of Magma in Lamprophyre Dykes as Indicated by Magnetic Anisotropy: Case Study from the Central Bohemian Dyke Swarm, Czech Republic

Geosciences, 2019
A composite lamprophyre dyke from the Central Bohemian Dyke Swarm (Czech Republic) shows both indications of magma free flow (normal magnetic fabric with magnetic foliation and lineation parallel to the dyke plane) as well as those of forcefully driven ...
František Hrouda, Shah W. Faryad, Šárka Kubínová, Kryštof Verner, Marta Chlupáčová   +4 more
doaj   +1 more source

Geochemical studies and economic perspective of light rare earth element (LREE) enriched carbonatite from Khaderpet, Eastern Dharwar Craton

Discover Geoscience
An account of petrographic features, geochemical character, enriched light rare earth elements (LREEs), and stable isotope (C–O) concentrations in carbonatite occurring in association with lamprophyre clan rock (LCR) from Khaderpet is presented here. The
Pothuri Ramesh Chandra Phani, Prabir Sengupta   +1 more
doaj   +1 more source

The antecryst compositional influence on Cretaceous alkaline lamprophyre dykes, SE Brazil

Brazilian Journal of Geology
The question of whether the antecryst assemblage affects the bulk composition of lamprophyre dykes, and could be responsible for the compositional zonation between their centers and borders is addressed through a detailed study involving four monchiquite
Saulo Gobbo Menezes, Rogério Guitarrari Azzone, Gaston Eduardo Enrich Rojas, Excelso Ruberti, Renata Cagliarani, Celso de Barros Gomes, Luanna Chmyz   +6 more
doaj   +1 more source

Effect of roof movement on gas flow in an extremely thick coal seam under fully mechanized sublevel caving mining conditions

Energy Science & Engineering, 2020
The abnormal emission of gas in coals is the main factor that induces serious gas disasters in coal mines. During the coal mining process, roof movement has important effects on the gas emission law and gas flow characteristics.
Haijun Guo, Xianzhang Li, Hao Cui, Kaixuan Chen, Yuanyuan Zhang   +4 more
doaj   +1 more source

Transcrustal magmatic system in lamprophyre dike constructed by multiple magma reservoirs

The mineral assemblages, chemistry, and textures of igneous rocks can record crucial information on magmatic processes in transcrustal magmatic systems.
Cai, Keda, Li, Zhenglin, Wang, Xiangsong, Leppard, Fenn, Sun, Min, Liu, Xijun, Zhang, Yunying, Wang, Yannan, Zhao, Guochun   +8 more
core   +1 more source