Results 31 to 40 of about 10,806 (258)

Geochemistry and tectonic setting of the supracrustal rocks from the central part of the Bundelkhand craton, India

JGEET: Journal of Geoscience, Engineering, Environment and Technology, 2019
Supracrustal rocks (mafics and ultramafics) occurs along with banded iron formation, and felsic volcanics around Babina, Dhaura, and Mauranipur linear east-west trends in central part of the Bundelkhand craton represent Archean crust.
M. M. Singh, Vinod K. Singh
doaj   +1 more source

Estimates of the Temperature and Melting Conditions of the Carpathian‐Pannonian Upper Mantle From Volcanism and Seismology

Geochemistry, Geophysics, Geosystems, 2020
What drives the formation of basaltic melts beneath intraplate volcanoes not associated with extensive thermal anomalies or lithospheric extension? Detailed constraints on the melting conditions and source region are imperative to resolve this question ...
Antoine J. J. Bracco Gartner, Dan McKenzie   +1 more
doaj   +1 more source

Geochemistry of spinels from xenoliths of mantle lherzolites (sverre Volcano, spitsbergen Archipelago)

Записки Горного института, 2017
The paper presents the results of a study (LA-ICP-MS method) of spinel from the collection of mantle xenoliths of lherzolites (seven xenoliths) selected in quaternary alkaline basalts of the Sverre volcano, the Spitsbergen archipelago.
D. S. Ashikhmin, Yu.-S. Chen, S. G. Skublov, A. E. Mel'nik   +3 more
doaj   +1 more source

Orthopyroxene-enrichment in the lherzolite-websterite xenolith suite from Paleogene alkali basalts of the Poiana Ruscă Mountains (Romania)

Geologica Carpathica, 2015
In this paper we present the petrography and geochemistry of a recently collected lherzolite-websterite xenolith series and of clinopyroxene xenocrysts, hosted in Upper Cretaceous–Paleogene basanites of Poiana Ruscă (Romania), whose xenoliths show ...
Nédli Zsuzsanna, Szabó Csaba, Dégi Júlia   +2 more
doaj   +1 more source

A Role for Subducted Oceanic Crust in Generating the Depleted Mid‐Ocean Ridge Basalt Mantle

Geochemistry, Geophysics, Geosystems, 2020
The composition of Earth's mantle, continental crust, and oceanic crust continuously evolve in response to the dynamic forces of plate tectonics and mantle convection.
Jonathan M. Tucker, Peter E. vanKeken, Rosemary E. Jones, Chris J. Ballentine   +3 more
doaj   +1 more source

Geochemistry of basalts in unravelling the mantle processes and crustal evolution: Insights from the greenstone belts of western Dharwar Craton

Geosystems and Geoenvironment, 2022
Basalts are an integral part of all the greenstone belts of Dharwar Craton which played a vital role in the thermo-tectonic evolution and mantle processes during the Archean time.
C. Manikyamba, Arijit Pahari, M. Santosh, K.S.V. Subramanyam, G. Harshitha Reddy   +4 more
doaj   +1 more source

Mantle pseudo-isochrons revisited [PDF]

The 2.0 Ga pseudo-isochron age inferred from the mid-ocean ridge basalt 207Pb/204Pb against 206Pb/204Pb diagram is reexamined on the basis of a statistical box model of mantle processes.
Rudge, J. F.
core   +1 more source

Ultramafic xenoliths from the Bearpaw Mountains, Montana, USA: evidence for multiple metasomatic events in the lithospheric mantle beneath the Wyoming craton [PDF]

, 2004
Ultramafic xenoliths in Eocene minettes of the Bearpaw Mountains volcanic field (Montana, USA), derived from the lower lithosphere of the Wyoming craton, can be divided based on textural criteria into tectonite and cumulate groups. The tectonites consist
James, D., MacDonald, R., Bodinier, J.L., Mason, P.R.D., Cox, K.G., Downes, Hilary, Hill, P.G., Upton, B.G.J., Hearn, B.C.   +8 more
core   +1 more source

Multiphase Tectonic Process With Slab Dynamics in the Northern East China Sea Shelf Basin

Geological Journal, EarlyView.
Megasequence 1 characterised by Palaeocene extension and differential subsidence driven by the rollback of the subducting Izanagi Plate. Megasequence 2 records a kinematic reorganisation of the East Asian margin, transition from a rifting to a compressional regime.
Juhwan Woo, Won‐Ki Kim, Chul Woo Rhee, Seungyeol Lee   +3 more
wiley   +1 more source

Geochemistry and tectonic development of Cenozoic magmatism in the Carpathian–Pannonian region [PDF]

, 2011
This review considers the magmatic processes in the Carpathian–Pannonian Region (CPR) from Early Miocene to Recent times, as well as the contemporaneous magmatism at its southern boundary in the Dinaride and Balkans regions.
Hilary Downes, Ioan Seghedi, Seghedi, I., Downes, Hilary   +3 more
core   +1 more source