Results 191 to 200 of about 3,752 (234)

Inclusion Suites — Macrocrysts, Xenocrysts, Xenoliths, etc

1991
The spectrum between truly cognate and wholly foreign inclusions was explained in die introduction to Chapter 4. Here we deal widi inclusions which are largely foreign (Types B-F). Table 6.1 explains the fairly standard nomenclature used. Inclusions characteristically constitute tens of percent of the volume of individual lamprophyre dykes, and locally
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Hydroxyl in mantle olivine xenocrysts from the Udachnaya kimberlite pipe

Physics and Chemistry of Minerals, 2006
The incorporation of hydrogen in mantle olivine xenocrysts from the Udachnaya kimberlite pipe was investigated by Fourier-transform infrared spectroscopy and secondary ion mass spectrometry (SIMS). IR spectra were collected in the OH stretching region on oriented single crystals using a conventional IR source at ambient conditions and in situ at ...
Koch-Müller, M., Matsyuk, S., Rhede, D., Wirth, R., Khisina, N.   +4 more
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Zoning in olivine xenocryst in hydrous systems

2008
Chemical zoning in xenocrysts may be inherited, the result of magmatic growth, or diffusive ion exchange with the host magma. To quantify magma residence times of xenocrysts based on diffusion zoning patterns thus requires knowledge of the contribution of diffusion to the zoning patterns and knowledge of appropriate diffusion coefficients.
Erdmann, Saskia, Scaillet, Bruno, Dungan, M.   +2 more
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Discovery of a Hadean xenocrystic zircon in the Cathaysia Block

Science Bulletin, 2022
Lu, Youyue, Cao, Jingya, Fu, Jianming, Liu, Lei, Wu, Qianhong, Yang, Xiaoyong, Yang, Shengxiong, Cheng, Shunbo, Qiu, Xiaofei, He, Ding   +9 more
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Chrome-diopside Xenocrysts Entrained in a Neoproterozoic Lamprophyre Dyke from the Mysuru Area: Their Origin and Implications for Lithospheric Thickness Beneath the Western Dharwar Craton, Southern India

Journal of the Geological Society of India, 2022
S. Raghuvanshi, N. V. Chalapathi Rao, D. Talukdar, Abhinay Sharma, R. Pandey   +4 more
semanticscholar   +1 more source

Provenance of zircon xenocrysts in the Neoproterozoic Brauna Kimberlite Field, São Francisco Craton, Brazil: Evidence for a thick Palaeoproterozoic lithosphere beneath the Serrinha block

, 2013
The 642 Ma-old Brauna Kimberlite Field is located on the northeastern sector of the São Francisco Craton (Serrinha block) and is one of the rare Neoproterozoic kimberlitic events in South America.
J. P. Donatti-Filho, E. Oliveira, N. McNaughton   +2 more
semanticscholar   +2 more sources

ASSIMILATION OF XENOCRYSTS IN GRANITIC MAGMAS: PRINCIPLES, PROCESSES, PROXIES, AND PROBLEMS

The Canadian Mineralogist, 2007
Country-rock materials, either as intact xenoliths or as disaggregated xenocrysts, are inevitable contaminants in granitic magmas. Xenocrysts approach chemical equilibrium with the granitic magma in several ways. Two pre-assimilation reactions may change the nature of the material being assimilated: redox , involving ferromagnesian silicates, oxides ...
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ASSIMILATION OF XENOCRYSTIC APATITE IN GRANITE MAGMAS

Geological Society of America Abstracts with Programs, 2020
Daniel Harlov, D.B. Clarke, Anne Jähkel, Sarah Cichy, Franziska Wilke, Xiang Yang   +5 more
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Evaluation of kimberlite diamond potential using FTIR spectroscopy of xenocrystic olivine

Lithos, 2009
Abstract Xenocrysts or phenocrysts of olivine in kimberlite show a diversity of hydroxyl-related infrared absorption bands that reflect compositional variation of their mantle source and conditions of last equilibration. Interpretation of infrared spectra of olivine in terms of equilibration/crystallization conditions may help to isolate spectral ...
Sergei Matveev, Thomas Stachel
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XENOCRYSTIC OLIVINE AND SPINEL IN THE ASUKA 12209 ANGRITE

2016
Of all the early Solar System planetesimal crustal rocks, angrite meteorites stand out from their more common basaltic equivalents. They have low silica contents (lacking low-Ca pyroxene), are rich in refractory elements (e.g. Ca, Al, and Ti, resulting in ‘fassaite’ pyroxene), and depleted in most alkali elements (Na, K, Rb) [e.g. 1]. Their parent body
McKibbin, Seann, Goderis, Steven, Chernonozhkin, Stepan, Van Malderen, Stijn, Mikouchi, Takashi, Yamaguchi, Akira, Pittarello, Lidia, Shirai, Naoki, Hublet, Geneviève, Greenwood, R., Frank, Vanhaecke, Debaille, Vinciane, Claeys, Philippe   +12 more
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