Search Results - "Kjarsgaard, B. A."

The evolution of calcite-bearing kimberlites by melt-rock reaction: evidence from polymineralic inclusions within clinopyroxene and garnet megacrysts from Lac de Gras kimberlites, Canada by Bussweiler, Y., Stone, R. S., Pearson, D. G., Luth, R. W., Stachel, T., Kjarsgaard, B. A., Menzies, A.

“…Megacrystic (>1 cm) clinopyroxene (Cr-diopside) and garnet (Cr-pyrope) xenocrysts within kimberlites from Lac de Gras (Northwest Territories, Canada) contain…”
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Unbedded diatreme deposits reveal maar-diatreme-forming eruptive processes: Standing Rocks West, Hopi Buttes, Navajo Nation, USA by Lefebvre, N. S., White, J. D. L., Kjarsgaard, B. A.

“…Diatremes provide partial records of how dyke-delivered magma, periodically interacting with water, produces the largest known cylindrical conduit structures…”
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Paragenetic types of carbonatite as indicated by the diversity and relative abundances of associated silicate rocks; evidence from a global database by Woolley, Alan R, Kjarsgaard, Bruce A

“…Data on the diversity and relative abundance of igneous rock types associated with carbonatite have been compiled for 477 occurrences, which represent 90% of…”
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Classification of distinct eruptive phases of the diamondiferous Star kimberlite, Saskatchewan, Canada based on statistical treatment of whole rock geochemical analyses by Grunsky, E.C., Kjarsgaard, B.A.

“…Discrete eruptive events of the Star kimberlite, Saskatchewan, Canada have been classified into five distinctive clusters using statistical methods applied to…”
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A Rb‐Sr Isochron Age For A Kimberlite From the Recently Discovered Lac De Gras Field, Slave Province, Northwest Canada by Davis, W. J., Kjarsgaard, B. A.

“…A Rb‐Sr phlogopite macrocryst‐whole rock isochron age of 47.5 ± 0.5 Ma is reported for a kimberlite from the recently discovered Lac de Gras field in the Slave…”
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Timing of eastern North American kimberlite magmatism: continental extension of the Great Meteor hotspot track? by Heaman, L.M., Kjarsgaard, B.A.

“…Twenty-nine new high precision U–Pb perovskite ages for kimberlite and other CO 2-rich ultrabasic rocks, primarily from five fields or clusters in eastern…”
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From source to crust: Tracing magmatic evolution in a kimberlite and a melilitite using microsample geochemistry by Malarkey, J., Pearson, D.G., Kjarsgaard, B.A., Davidson, J.P., Nowell, G.M., Ottley, C.J., Stammer, J.

“…We present an integrated microsampling trace element and isotopic study of primary minerals within the Jos kimberlite, Canada, in order to observe how…”
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Liquid immiscibility between trachyte and carbonate in ash flow tuffs from Kenya by MACDONALD, R, KJARSGAARD, B. A, SKILLING, I. P, DAVIES, G. R, HAMILTON, D. L, BLACK, S

“…Three thin, syn-caldera ash flow tuffs of the Suswa volcano in Kenya contain pumiceous clasts and globules of trachytic glass and clasts rich in carbonate…”
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The timing of kimberlite magmatism in North America: implications for global kimberlite genesis and diamond exploration by Heaman, L.M, Kjarsgaard, B.A, Creaser, R.A

“…Based on a compilation of more than 100 kimberlite age determinations, four broad kimberlite emplacement patterns can be recognized in North America: (1) a…”
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High U/Th partitioning by clinopyroxene from alkali silicate and carbonatite metasomatism: an origin for Th/U disequilibrium in mantle melts? by Foley, S. F., Petibon, C. M., Jenner, G. A., Kjarsgaard, B. A.

“…Clinopyroxene/melt pairs in strongly potassic silicate and carbonatite melts exhibit unusually high U/Th partitioning ratios of ˜ 3 and ˜ 2, respectively…”
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Na-rich carbonate inclusions in perovskite and calzirtite from the Guli intrusive Ca-carbonatite, polar Siberia by KOGARKO, L. N, PLANT, D. A, HENDERSON, C. M. B, KJARSGAARD, B. A

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Experimental studies of the system Na2Ca(CO3)2-NaCl-KCl at 0.1 GPa; implications for the differentiation and low-temperature crystallization of natrocarbonatite by Mitchell, Roger H, Kjarsgaard, Bruce A

“…The system [Na2Ca(CO3)2 ]100-x-(50 wt.% NaCl+50 wt.% KCl)x (10<x<80 wt.%), a join in the quaternary system Na2CO3 - CaCO3 - NaCl - KCl, has been investigated…”
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Silicate-Carbonate Liquid Immiscibility and Phase Relations in the System SiO2-Na2O-Al2O3-CaO-CO2 at 0·1-2·5 GPa with Applications to Carbonatite Genesis by Brooker, R. A., Kjarsgaard, B. A.

“…We present new experiments, combined with a re-evaluation of published data, to characterize the topology of the silicate-carbonate two-liquid solvus in the…”
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A Re–Os isotope and PGE study of kimberlite-derived peridotite xenoliths from Somerset Island and a comparison to the Slave and Kaapvaal cratons by Irvine, Gordon J, Pearson, D.Graham, Kjarsgaard, B.A, Carlson, R.W, Kopylova, M.G, Dreibus, G

“…The concentrations of platinum-group elements (PGE; Os, Ir, Ru, Pd and Pt) and Re, and the Os isotopic compositions were determined for 33 lithospheric mantle…”
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The aluminum-in-olivine thermometer for mantle peridotites — Experimental versus empirical calibration and potential applications by Bussweiler, Y., Brey, G.P., Pearson, D.G., Stachel, T., Stern, R.A., Hardman, M.F., Kjarsgaard, B.A., Jackson, S.E.

“…This study provides an experimental calibration of the empirical Al-in-olivine thermometer for mantle peridotites proposed by De Hoog et al. (2010). We report…”
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Trace element analysis of high-Mg olivine by LA-ICP-MS – Characterization of natural olivine standards for matrix-matched calibration and application to mantle peridotites by Bussweiler, Y., Giuliani, A., Greig, A., Kjarsgaard, B.A., Petts, D., Jackson, S.E., Barrett, N., Luo, Y., Pearson, D.G.

“…The trace element composition of olivine is becoming increasingly important in petrological studies due to the ubiquity of olivine in the Earth's upper mantle…”
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Geochemistry of hypabyssal kimberlites from Lac de Gras, Canada: Comparisons to a global database and applications to the parent magma problem by Kjarsgaard, B.A., Pearson, D.G., Tappe, S., Nowell, G.M., Dowall, D.P.

“…We present 104 whole-rock geochemical analyses of hypabyssal kimberlite from the Lac de Gras field. Screens using Yb versus Al 2O 3 and ln Si/Al versus ln…”
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Between carbonatite and lamproite—Diamondiferous Torngat ultramafic lamprophyres formed by carbonate-fluxed melting of cratonic MARID-type metasomes by Tappe, Sebastian, Foley, Stephen F., Kjarsgaard, Bruce A., Romer, Rolf L., Heaman, Larry M., Stracke, Andreas, Jenner, George A.

“…New U–Pb perovskite ages reveal that diamondiferous ultramafic lamprophyre magmas erupted through the Archean crust of northern Labrador and Quebec (eastern…”
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Constraints on the depth and thermal history of cratonic lithosphere from peridotite xenoliths, xenocrysts and seismology by Mather, Kathy A., Pearson, D. Graham, McKenzie, Dan, Kjarsgaard, Bruce A., Priestley, Keith

“…Despite the relatively long-standing availability of numerical approaches for estimating palaeogeotherms using peridotite xenolith Pressure–Temperature (P–T)…”
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The geological record of base metal sulfides in the cratonic mantle: A microscale 187Os/188Os study of peridotite xenoliths from Somerset Island, Rae Craton (Canada) by Bragagni, A., Luguet, A., Fonseca, R.O.C., Pearson, D.G., Lorand, J.-P., Nowell, G.M., Kjarsgaard, B.A.

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