Results 51 to 60 of about 3,644 (268)

East Meets West: The Trace of the Mesoproterozoic Kibaran Event in the Mantle Lithosphere Beneath Eastern Tanzania

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 1, January 2026.
Abstract We present elemental geochemistry and multiple isotopic systematics (Re‐Os, Lu‐Hf, Sm‐Nd and Sr) for mantle peridotite xenoliths from Lashaine in northern Tanzania. We use the data to examine how the major Proterozoic tectono‐thermal events that affected the crust of the western Tanzanian craton are imprinted on the lithospheric mantle in the ...
Sheng‐Hua Zhou, Qiao Shu, Sally A. Gibson, Hong‐Fu Zhang, Jing‐Jing Zhu, Hélène Legros, D. Graham Pearson   +6 more
wiley   +1 more source

AMPHIBOLE-PHLOGOPITE XENOLITHS FROM KIMBERLITES AS EVIDENCE OF METASOMATIC PROCESSES IN THE LITHOSPHERIC MANTLE BENEATH KUOIKA FIELD

Геодинамика и тектонофизика
This paper devoted to the mantle xenoliths with evidence of modal metasomatic alteration from the Obnazhennaya kimberlite pipe (Kuoika kimberlite field).
T. V. Kalashnikova, S. I. Kostrovitsky, A. M. Dymshits   +2 more
doaj   +1 more source

Geological structure and material composition of the kimberlite body «Yanvarskoe» (Daldyn-Alakit diamond-bearing district)

Известия высших учебных заведений: Геология и разведка, 2018
The new kimberlite pipe «Yanvarskaya» has been discovered in the Alakit-Markha field by a complex of geological and geophysical methods. For its delineation and the study three profile of wells were covered: one profile is along the long axis and two are
D. V. Ivanov, A. V. Tolstov, V. V. Ivanov   +2 more
doaj   +1 more source

Theoretical petrology [PDF]

, 1979
The central issues in petrology have remained remarkably unchanged in the last 50 years. In igneous petrology, the focus is on understanding the nature and cause of diversity in igneous rocks: on identifying primary magma types and constraints on the ...
Stolper, Edward
core   +1 more source

Electrical Conductivity of Carbonatite Melts to 20 GPa: Constraints on Partial Melting Atop the 410‐km Discontinuity and in the Lower Mantle Transition Zone

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 1, January 2026.
Abstract Deep‐origin carbonatite melts are considered to be the products of partial‐melting of the oceanic crust in the subduction zones. In this study, we conducted electrical conductivity (EC) measurements on two samples, the composition of which resemble the partial‐melting products atop the 410‐km discontinuity and in the lower part of the ...
Bin Zhao, Jintao Zhu, Qi Chen, Takashi Yoshino   +3 more
wiley   +1 more source

Platinum-group element contents of Karelian kimberlites: implications for the PGE budget of the sub-continental lithospheric mantle [PDF]

, 2017
We present high-precision isotope dilution data for Os, Ir, Ru, Pt, Pd and Re in Group I and Group II kimberlites from the Karelian craton, as well as 2 samples of the Premier Group I kimberlite pipe from the Kaapvaal craton. The samples have, on average,
Barnes, Sarah-Jane, Maier, W.D., O'Brien, H., Peltonen, P.   +3 more
core   +2 more sources

Study of Garnets in Hellenistic–Roman Jewellery From the Collections of the Archaeological Museum of Thessaloniki, Greece

Journal of Raman Spectroscopy, Volume 56, Issue 11, Page 1235-1253, November 2025.
This study presents the gemological analysis of 25 garnets from Hellenistic and Roman jewellery in the Archaeological Museum of Thessaloniki using mobile Raman spectroscopy and micro‐EDXRF. The garnets are classified into three geochemical clusters, with notable differences in distribution between Thessaloniki and Pydna, suggesting distinct trading ...
Maria Nikopoulou, Stefanos Karampelas, Evangelia Tsangaraki, Lambrini Papadopoulou, Christos Katsifas, Ioannis Nazlis, Annareta Touloumtzidou, Vasilios Melfos, Nikolaos Kantiranis   +8 more
wiley   +1 more source

Stable isotope evidence for crustal recycling as recorded by superdeep diamonds [PDF]

, 2015
© 2015 Elsevier B.V. Sub-lithospheric diamonds from the Juina-5 and Collier-4 kimberlites and the Machado River alluvial deposit in Brazil have carbon isotopic compositions that co-vary with the oxygen isotopic compositions of their inclusions, which ...
Bulanova, GP, Burnham, AD, Kohn, SC, Smith, CB, Thomson, AR, Walter, MJ   +5 more
core   +5 more sources

Secular Variation in the North American Kimberlite Formation: The Variable Connection to LLSVPs

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 10, October 2025.
Abstract Kimberlites are rare and perplexing igneous rocks that may represent the deepest‐sourced melt type extracted from within the Earth's mantle, and their origin may be associated with Large Low Shear Velocity Provinces (LLSVPs) along the core‐mantle boundary.
C. Adam, P. D. Kempton
wiley   +1 more source

Correlative Tomography for Polymineralic Inclusion Composition in Sublithospheric Diamonds

Geophysical Research Letters, Volume 52, Issue 11, 16 June 2025.
Abstract Sublithospheric diamonds and their inclusions are the deepest known samples from the Earth's mantle. Typically, the inclusions are trapped as minerals which are only stable in the deep mantle, retrogressing into multiple phases during their uplift. Determining the bulk inclusion composition is difficult but crucially important.
B. D. Rayner, S. C. Kohn, R. J. Garwood, A. D. Burnham, G. P. Bulanova, C. B. Smith, A. R. Thomson   +6 more
wiley   +1 more source