Results 51 to 60 of about 946 (178)

Assessing Pb Isotopic Equilibrium Between Apatite and K‐Feldspar

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 2, February 2026.
Abstract Quantifying common Pb, the non‐radiogenic Pb present in a mineral independent of in situ U decay, is essential for obtaining accurate U–Pb ages in common Pb‐bearing minerals such as apatite. However, constraining the amount and composition of common Pb, as well as the timing of its entrapment, remains a persistent challenge.
Priyanjan Datta, Christopher L. Kirkland, Janne Liebmann, Hugo K. H. Olierook   +3 more
wiley   +1 more source

Changes in chemical composition of peridotite olivine crystals as a result of xenolith–host rock interaction (Jeziorna, Lower Silesia, SW Poland)

Mineralogia
Petrological observations and major elements analyses in olivine crystals in small xenoliths (>1.5 cm in diameter) from the Jeziorna locality, SW Poland, are presented.
Nowak Monika
doaj   +1 more source

Lamprophyres of the Peshchernoe gold deposit, their geological position, material composition, and metasomatic alterations (Northern Urals)

Записки Горного института
The article presents the first data on biotite-hornblende lamprophyres discovered at the Peshchernoe gold deposit. We consider the geological position of lamprophyre dikes in the deposit structure and the relationship of these rocks with tectonically ...
Dmitrii V. Kuznetsov, Sergei Yu. Stepanov, Andrei V. Butnyakov, Viktoriya S. Igosheva   +3 more
doaj  

Water and Oxygen Fugacity in the Lithospheric Mantle Wedge beneath the Northern Canadian Cordillera (Alligator Lake)

Geochemistry, Geophysics, Geosystems, 2018
Assessing water contents of subduction zone mantle peridotites can gain insight into the compositions of slab‐derived fluids/melts and the active margin water cycle.
McKensie L. Kilgore, Anne H. Peslier, Alan D. Brandon, William M. Lamb   +3 more
doaj   +1 more source

The Lages diatremes: mineral composition and petrological implications

Anais da Academia Brasileira de Ciências, 2007
Chemical data of heavy minerals from Lages diatremes in southern Brazil have been studied with the aim of characterizing the sample source(s). Three groups of minerals are recognized: I) aluminian-chromian pyroxene, pyrope garnet and chromian spinel ...
Giancarlo Barabino, Celso B. Gomes, Gianbosco Traversa   +2 more
doaj   +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

The age position of gold-sulfide mineralization in the metahyperbasites of the Sysert’ metamorphic complex in the Middle Urals

Литосфера, 2015
The massive and disseminated gold-copper-cobalt sulfide ores (Karasya Gora deposit) are restricted to the body of metahyperbasites of anthophyllite and tremolite-anthophyllite composition.
V. V. Murzin, V. V. Hiller, D. A. Varlamov   +2 more
doaj   +2 more sources

Diamond preservation in the lithospheric mantle recorded by olivine in kimberlites. [PDF]

Nat Commun, 2023
Giuliani A, Phillips D, Pearson DG, Sarkar S, Müller AA, Weiss Y, Preston R, Seller M, Spetsius Z.   +8 more
europepmc   +1 more source

Metacarbonate rocks of the Paleoproterozoic Khapchan series (southeastern part of the Anabar Shield): mineral and chemical composition, metamorphic conditions

Записки Горного института
The mineral composition of metacarbonate rocks (silicate marbles and carbonate-silicate rocks) of the Khapchan series (southeastern part of the Anabar Shield) was studied, and the PT (pressure and temperature)-parameters of their formation were ...
Ekaterina Yu. Akimova, Nikolai I. Gusev, Aleksandr D. Savelev, Daniil R. Donchenko   +3 more
doaj  

Wehrlite xenoliths and petrogenetic implications, Hosséré Do Guessa volcano, Adamawa plateau, Cameroon

Open Geosciences, 2022
Nkouandou Oumarou Faarouk, Bardintzeff Jacques-Marie, Ndassa Zénab Nouraan Njankouo, Mefire Aminatou Fagny, Haman Adama   +4 more
doaj   +1 more source