Results 41 to 50 of about 2,520 (206)

Dispersal, source and glass chemistry of a third tephra unit within Iceland's Settlement Layer

Boreas, EarlyView.
Tephra layers may be studied to understand the dynamics and sequence of past explosive volcanism. In Iceland, the distinctive Settlement Layer (AD ~877) underlies almost all archaeological evidence for the Norse Settlement and is preserved in soils across Iceland and as cryptotephra overseas.
Conner A. G. Morison, GUÐRÚN LARSEN, Anthony J. Newton, Andrew J. Dugmore   +3 more
wiley   +1 more source

Mineral analyses and reconstructed bulk xenolith compositions for the Kaapvaal craton

, 2023
EPMA & LA-ICP-MS mineral analyses and reconstructed bulk xenolith compositionsTHIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE.
Gibson, S (via Mendeley Data)
core   +1 more source

Cold deep subduction recorded by remnants of a Paleoproterozoic carbonated slab

Nature Communications, 2018
The onset of modern-style plate tectonics remains under debate. Here, Xu et al. report a cold thermal-gradient recorded in an eclogite xenolith in Paleoproterozoic carbonatite from orogen, and propose that modern-style subduction has operated since at ...
Cheng Xu, Jindřich Kynický, Wenlei Song, Renbiao Tao, Zeng Lü, Yunxiu Li, Yueheng Yang, Miroslav Pohanka, Michaela V. Galiova, Lifei Zhang, Yingwei Fei   +10 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

Marie Byrd Land lithospheric mantle: A review of the xenolith record [PDF]

, 2021
The Marie Byrd Land (MBL) lithospheric mantle xenolith record comprises over 100 samples from a range of localities spanning both major crustal terranes that comprise MBL: Ross and Amundsen provinces.
Wysoczanski, Richard J., Handler, Monica R., Gamble, John A.   +2 more
core   +1 more source

XENOLITH GARNETS FROM MIR KIMBERLITE PIPE: CHEMICAL COMPOSITION AND EVIDENCE OF METASOMATIC PROCESSES IN THE LITHOSPHERE MANTLE

Геодинамика и тектонофизика, 2022
This paper reports the results on the composition of lithosphere mantle under the Mirny kimberlite field. The authors investigated 57 samples of the mantle xenoliths collected from the Mir pipe.
T. V. Kalashnikova, S. I. Kostrovitsky, K. A. Sinitsyn, E. E. Yudintseva   +3 more
doaj   +1 more source

Sheared lherzolite xenoliths revisited [PDF]

Journal of Geophysical Research: Solid Earth, 2008
The microstructures of sheared lherzolite xenoliths from South African kimberlites are investigated using new microstructural analysis techniques and new rheological data. By applying electron backscatter diffraction (EBSD) methods and the M‐index technique for quantifying the strength of lattice preferred orientation (LPO), it is demonstrated that ...
Philip Skemer, Shun‐ichiro Karato
openaire   +1 more source

Calc–silicate xenolith – magma interactions in the Rustenburg Layered Suite, Bushveld Complex

, 2022
A thesis submitted in fulfilment of the requirements for the degree of Doctor of Philosophy to the Faculty of Science, School of Geosciences, University of the Witwatersrand, Johannesburg, 2022The mafic-ultramafic Rustenburg Layered Suite (RLS) of the 2 ...
Koovarjee, Bavisha
core  

Indications for ultra-high pressure metamorphism of amphibolite xenolith in the Arnea granite [PDF]

, 2001
Στην περιοχή της Μαραθουσας μελετήθηκε αμφιβολιτικός ξενόλιθος μέσα στον γρανίτη της Αρναίας, στα όρια του με την Σερβο-Μακεδονική μάζα. Εντός του αμφιβολίτη, αλλά και εντός της ζώνης επαφής με τον γρανίτη, ανευρέθησαν τετραεδρικές και οκταεδρικές μορφές
ΙΩΑΝΝΙΔΗΣ, Ν., ΣΚΛΑΒΟΥΝΟΣ, Σ.   +1 more
core  

A Volcanological Paradox in a Thin-Section: Large Explosive Eruptions of High-Mg Magmas Explained Through a Vein of Silicate Glass in a Serpentinized Peridotite Xenolith (Hyblean Area, Sicily)

Geosciences, 2019
Ultramafic magmas (MgO ≥ 18 wt%) are generally thought to be primary mantle melts formed at temperatures in excess of 1600 °C. Volatile contents are expected to be low, and accordingly, high-Mg magmas generally do not yield large explosive ...
Alessandra Correale, Vittorio Scribano, Antonio Paonita   +2 more
doaj   +1 more source