Results 231 to 240 of about 22,040 (302)

Petrographic and Geochemical Characteristics Associated with Felsic Xenolith Assimilation in Kimberlite

Canadian Mineralogist, 2022
Assimilation of country rock xenoliths by the host kimberlite can result in the development of concentric reaction zones within the xenoliths and a reaction halo in the surrounding contaminated kimberlite.
Sofya Niyazova, M. Kopylova, M. Gaudet, A. De Stefano   +3 more
semanticscholar   +1 more source

Geochronology and Geochemistry of the Granite Xenolith within the Lamprophyre at the Zhenyuan Gold Deposit (Yunnan Province, SW China)

Acta Geologica Sinica - English Edition, 2022
The xenoliths in host rocks of hydrothermal gold deposits can generally provide much geochemical information of the deep rocks, which may have an implication for the sources of ore‐forming materials.
Huichao Zhang, Hongrui Zhang, Z. Hou, P. Chai, Kai Zhou   +4 more
semanticscholar   +1 more source

Contrasting Group I and Group II Eclogite Xenolith Petrogenesis: Petrological, Trace Element and Isotopic Evidence from Eclogite, Garnet-Websterite and Alkremite Xenoliths in the Kaalvallei Kimberlite, South Africa

Journal of Petrology, 2005
K. Viljoen, D. Schulze, A. Quadling
exaly   +2 more sources

Subduction-related metasomatism in the thinning lithosphere: Evidence from a composite dunite-orthopyroxenite xenolith entrained in Mesozoic Laiwu high-Mg diorite, North China Craton

Geochemistry, Geophysics, Geosystems, 2005
Li-Hui Chen
exaly   +2 more sources

Murchison xenoliths

Geochimica et Cosmochimica Acta, 1988
C3 xenoliths in a C2 host (Murchison) are unique among known meteoritic xenolith-host occurrences. They offer an opportunity to determine possible effects on the xenoliths by the hydrated host. Eleven xenoliths were found ranging from 2 to 13 mm. Four of these Murchison Xenoliths (MX1, MX2, MX3 and MX4) have been studied in detail.
Olsen, Edward J., Davis, Andrew M., Hutcheon, Ian D., Clayton, Robert N., Mayeda, Toshiko K., Grossman, Lawrence   +5 more
openaire   +2 more sources

Fluid inclusions in mantle xenoliths

Lithos, 2001
Abstract Fluid inclusions in olivine and pyroxene in mantle-derived ultramafic xenoliths in volcanic rocks contain abundant CO2-rich fluid inclusions, as well as inclusions of silicate glass, solidified metal sulphide melt and carbonates. Such inclusions represent accidentally trapped samples of fluid- and melt phases present in the upper mantle, and
Tom Andersen, Else-Ragnhild Neumann
openaire   +1 more source

Diamondiferous eclogite xenoliths in kimberlite

Lithos, 1970
Abstract The physical properties of garnet in diamond-kyanite-eclogite and diamond-corundum-eclogite are presented for the first time, and are compared with garnet in six newly available diamond eclogites. Garnets from diamond-bearing eclogites do not constitute a separate subdivision, but plot in the compositional fields appropriate to their ...
P.C Rickwood, Morna Mathias
openaire   +1 more source

Rare gases in Samoan xenoliths

Earth and Planetary Science Letters, 1992
The rare gas isotopic compositions of residual harzburgite xenoliths from Savai'i (SAV locality) and an unnamed seamount south of the Samoan chain (PPT locality) provide important constraints on the rare gas evolution of the mantle and atmosphere. Despite heterogeneous trace element compositions, the rare gas characteristics of the xenoliths from each ...
Poreda, R. J., Farley, K. A.
openaire   +2 more sources

Chromite spinels from ultramafic xenoliths

Geochimica et Cosmochimica Acta, 1975
Abstract The spinels in ultramafic xenoliths from kimberlites and alkali olivine basalts show a wide range of compositional variation, far in excess of the ranges shown by their coexisting silicate phases. The chemical variation of the spinels is a function of the host magma, texture and depth of origin. The spinels occur in five textural types: 1.
Asish R Basu, Ian D MacGregor
openaire   +1 more source

MANTLE XENOLITHS IN THE MATSOKU KIMBERLITE PIPE

Physics and Chemistry of the Earth, 1975
Abstract The chemical compositions of selected xenoliths from the Matsoku pipe and many constituent minerals are discussed. It is concluded that the xenoliths form a closely related suite of rocks of differing mineralogy and chemistry which could have been produced during a single igneous event in the mantle. It is likely that at solidus temperatures
J.J. Gurney, B. Harte, K.G. Cox
openaire   +1 more source