This document lists RJ Sweeney's refereed publications and abstracts. It includes over 30 journal publications dating from 1990-2006 related to experimental petrology and geochemistry. The publications examine topics like carbonation/decarbonation of eclogites, potassium amphibole stability, mantle origins of basalts, trace element partitioning between minerals and melts, and the role of hydrogen in geological processes. It also lists numerous conference abstracts on similar experimental petrology research.
forms and distribution of potassium along a toposequence on basaltic soils of...IJEAB
The study was conducted in Vom, Jos Plateau state in the Southern Guinea Savanna zone of Nigeria to accentuate the forms of potassium distribution associated with topographic positions. The study area lies between longitudes 080 45’ 01” and 80 47’ 56’’ E, latitudes 90 43’ 17’’ and 90 45’ 15’’ N, with an elevation of about 1270m above sea level. A stratified purposive sampling procedure was adapted, where four landscape positions were identified using Global Positioning System (GPS). The crest, upper slope, middle, and lower slope positions were identified, each representing changes in geomorphology. Two pedons were georeferenced at each topographic position, where they were sunk and described. Result show that the forms of K varied with topographic positions. Potassium distribution varied from surface to subsurface in different topographic positions. Water soluble K was higher at crest surface (0.0569 cmolkg-1) and decreased with soil profile depth. Exchangeable K has highest value of 0.1317 and 0.1308 cmol/kg-1 at both lower slope positions in general. Non exchangeable K values where higher at all surfaces than the subsurfaces of topographic positions. HCl soluble K values were higher at lower and upper slopes surface, moderately at middle and least at crest slope positions. Total K values were higher at upper slope subsurface, middle, and lower slope surface with low variations at the crest positions. However, the distribution of the K forms did not shown a well – defined trend with respect to topographic positions.
Student fieldwork opportunities in macrotidal estuaries: Quaternary geoscienc...Prof Simon Haslett
Professor Simon K. Haslett of the Centre for Excellence in Learning and Teaching of the University of Wales, Newport's, presentation to the Atlantic Geoscience Society Colloquium, 6th February 2010, Wolfville, Nova Scotia, Canada
Textural Characteristics and Post Depositional Effects on the Reservoir Rock:...Premier Publishers
Textural parameters in terms of grain size and sorting play a vital role in determining the sandstone reservoir characters such as porosity and permeability. Core samples of two wells were described lithologically in terms of grain size, sorting, colour, structures and bioturbation. A total of 101 samples were plugged for porosity and permeability measurement under steady state flow. Textural properties exhibited by the lithofacies are resultants of energy of deposition which yielded various lithofacies associations which are dominantly tidal channel, tidal flat, deltaic shale, lower shoreface and marine shale. Reservoir genetic unit is an upgrade of lithofacies association whereby the reservoir genetic units are map able over distance and across wells based on peculiar characteristics. Therefore, the core GX1 is mainly tidal channel and tidal flats while core GX2 is mainly lower shoreface to foreshore. Reservoir quality shows that the tidal reservoir genetic units possess moderately high porosity and excellent permeability values compared to lower shoreface reservoir genetic units of higher porosity values and relatively lower permeability values. These differences are as a result of textural properties. Structures and bioturbation which tend to increase or decrease the pore throat size. The effect is visible in the high permeability of the channel deposits. Fine grain size and good sorting are responsible for high porosity in lower shoreface deposits.
forms and distribution of potassium along a toposequence on basaltic soils of...IJEAB
The study was conducted in Vom, Jos Plateau state in the Southern Guinea Savanna zone of Nigeria to accentuate the forms of potassium distribution associated with topographic positions. The study area lies between longitudes 080 45’ 01” and 80 47’ 56’’ E, latitudes 90 43’ 17’’ and 90 45’ 15’’ N, with an elevation of about 1270m above sea level. A stratified purposive sampling procedure was adapted, where four landscape positions were identified using Global Positioning System (GPS). The crest, upper slope, middle, and lower slope positions were identified, each representing changes in geomorphology. Two pedons were georeferenced at each topographic position, where they were sunk and described. Result show that the forms of K varied with topographic positions. Potassium distribution varied from surface to subsurface in different topographic positions. Water soluble K was higher at crest surface (0.0569 cmolkg-1) and decreased with soil profile depth. Exchangeable K has highest value of 0.1317 and 0.1308 cmol/kg-1 at both lower slope positions in general. Non exchangeable K values where higher at all surfaces than the subsurfaces of topographic positions. HCl soluble K values were higher at lower and upper slopes surface, moderately at middle and least at crest slope positions. Total K values were higher at upper slope subsurface, middle, and lower slope surface with low variations at the crest positions. However, the distribution of the K forms did not shown a well – defined trend with respect to topographic positions.
Student fieldwork opportunities in macrotidal estuaries: Quaternary geoscienc...Prof Simon Haslett
Professor Simon K. Haslett of the Centre for Excellence in Learning and Teaching of the University of Wales, Newport's, presentation to the Atlantic Geoscience Society Colloquium, 6th February 2010, Wolfville, Nova Scotia, Canada
Textural Characteristics and Post Depositional Effects on the Reservoir Rock:...Premier Publishers
Textural parameters in terms of grain size and sorting play a vital role in determining the sandstone reservoir characters such as porosity and permeability. Core samples of two wells were described lithologically in terms of grain size, sorting, colour, structures and bioturbation. A total of 101 samples were plugged for porosity and permeability measurement under steady state flow. Textural properties exhibited by the lithofacies are resultants of energy of deposition which yielded various lithofacies associations which are dominantly tidal channel, tidal flat, deltaic shale, lower shoreface and marine shale. Reservoir genetic unit is an upgrade of lithofacies association whereby the reservoir genetic units are map able over distance and across wells based on peculiar characteristics. Therefore, the core GX1 is mainly tidal channel and tidal flats while core GX2 is mainly lower shoreface to foreshore. Reservoir quality shows that the tidal reservoir genetic units possess moderately high porosity and excellent permeability values compared to lower shoreface reservoir genetic units of higher porosity values and relatively lower permeability values. These differences are as a result of textural properties. Structures and bioturbation which tend to increase or decrease the pore throat size. The effect is visible in the high permeability of the channel deposits. Fine grain size and good sorting are responsible for high porosity in lower shoreface deposits.
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1. RJ Sweeney
Refereed Publications
Knoche, R., Sweeney, R.J. and Luth, R.W. (1999). Carbonation and decarbonation of
eclogites: the role of garnet. Contrib. Min. Petrol., v135, 332-339.
Konzett, J., Sweeney, R.J., Thompson, A.B. and Ulmer, P. (1997). Potassium
amphibole stability in the Upper Mantle: an experimental study in a
Peralkaline KNCMASH system to 8.5 GPa. J. Petrol., 38, 537-568.
Konzett, J., Armstrong, R.A., Sweeney, R.J. and Compston, W. (1998). The timing of
MARID metasomatism in the Kaapvaal mantle: an ion probe study of
zircons from MARID xenoliths. Earth Planet. Sci. Lett., 160, 133-145.
Rawlings, D.J., Watkeys, M.K. and Sweeney, R.J. (1999). Peperitic upper margin of
an invasive flow, Karoo flood basalt province, northern Lebombo. S.
Afr. J. Geol., 102(4), 377-383.
Sweeney, R.J. and Watkeys, M.K. (1990). A possible link between Mesozoic
lithospheric architecture and Gondwana flood basalts. J. African Earth
Sciences, v 10, 707–716.
Sweeney, R.J., Falloon, T.J., Green, D.H. and Tatsumi, Y. (1991). The mantle origins
of Karoo Picrites. Earth Planet. Sci. Lett., 107, 256-271.
Sweeney, R.J., Green, D.H. and Sie, S.H. (1992). Trace and minor element
partitioning between garnet and amphibole and carbonatite melt. Earth
Planet, Sci. Lett., 113, 1-14.
Sweeney, R.J., Thompson, A.B. and Ulmer, P. (1993). Phase relations of a natural
MARID composition and implications for MARID genesis,
lithospheric melting and mantle metasomatism. Contrib. Mineral.
Petrol. 115. 225-241.
Sweeney, R.J., Duncan, A.R. and Erlank, A.J. (1994). Geochemistry and petrogenesis
of central Lebombo Karoo basalts. J. Petrol., 35(1), 95-125.
Sweeney, R.J. and Jablonski, W. (1994). A technique for the determination of
selected elements present in trace proportions in silicates and
carbonates by electron microprobe. X-ray Spectrometry, 23(2), 91-95.
Sweeney, R.J. (1994). Carbonatite melt compositions in the Earth’s mantle. Earth
Planet, Sci. Lett., 128, 259-270.
Sweeney, R.J., Falloon, T.J., Green, D.H. (1995). Experimental constraints on the
possible mantle origins of natrocarbonatite, 191-207. K. Bell, J. Keller
(eds.) IAVCEI Proceedings in Volcanology 4, Carbonatite Volcanism:
Oldoinyo Lengai and the Petrogenesis of Natrocarbonatites. Springer
Verlag, Berlin pp210.
2. Sweeney, R.J., Prozesky, V. and Przybylowicz, W. (1995). Trace and minor element
partitioning between silicate minerals and carbonatite- and silicate-
melts at 18kb to 46kb pressure. Geochim. Cos. Acta, 59, 3671-3683.
Sweeney, R.J. (1996). The role of hydrogen in geological processes in the Earth’s
interior. Solid State Ionics, 97, 393-397.
Sweeney, R.J., Prozesky, V. and Springhorn, K. (1997). Use of the elastic recoil
detection analysis (ERDA) microbeam technique for the quantitative
determination of hydrogen in materials and hydrogen partitioning
between olivine and melt at high pressures. Geochim. Cos. Acta., 61,
101-113.
Sweeney, R, J., Prozesky, V.M., Churms, C.L., Padaychee, J. and Springhorn, K.
(1998). Application of a ∆E-E telescope for sensitive ERDA
measurement of hydrogen. Nucl. Ins. Methods in Physics Res. B., 136-
138, 685-688.
Sweeney, R.J., Prozesky, V. and Springhorn, K. (1999). The quantitative
determination of H in geological materials (silicates) by elastic recoil
detection analysis (ERDA). Nucl. Ins. Methods in Physics Res. B.,
130, 623-627.
Sweeney, R.J. and Winter, F. (1999). Kimberlite as high-pressure melts: the
determination of segregation depth from major element chemistry.
Proc. 5th
Int. Kimberlite Conf., eds. Gurney et al., v2, 846-851.
Sweeney, R, J., Prozesky, V.M., Viljoen, K.S. and Connell, S. (1999). The sensitive
determination of H in diamond by infrared (FTIR) spectroscopy and
micro-elastic-recoil (ERDA) techniques. Nucl. Ins. Methods in Physics
Res. B., 158, 582-587.
Ulmer, P. and Sweeney, R.J. (2002). Generation and differentiation of Group II
kimberlites: constraints from a high pressure experimental study to 10
GPa. Geochim. Cos. Acta., 66, 2139-2154.
3. Abstracts
Erlank, A.J., Duncan, A.R., Marsh, J.S., Sweeney, R.J., Hawkesworth, C.J., Milner,
S.C., McG Miller, R. and Rogers, N.W. (1988). A major mantle
heterogeneity in southern Gondwanaland. Abs. E.A.G. Int. Congress
of Geochemistry and Cosmochemistry, Paris. Chemical Geology, 70
(1/2), 202.
Erlank, A.J., Duncan, A.R., Marsh, Sweeney, R.J., Hawkesworth, C.J., Milner, S.C.,
McG Miller, R. and Rogers, N.W. (1988). A laterally extensive
geochemical heterogeneity in the sub-continental Gondwana
lithosphere. Ext. Abs. Evol. Continental Lithosphere, Brazil 1-9.
Erlank, A.J., Duncan, A.R., Sweeney, R.J., Milner, S.C., Marsh, J.S., Hawkesworth,
C.J., Rogers, N.M., and McG Miller, R. (1989). Is there a laterally
extensive geochemical boundary in Mesozoic basalts of southern
Gondwanaland. Abs. 28th
Int. Geol. Congress, Washington, v1, 458.
Konzett, J., Sweeney, R.J., Compston, W. (1995). The correlation of kimberlite
activity with mantle metasomatism. Ext. Abs. Kimberlite Conf.,
Novosibirsk.
Marsh, J.S., Sweeney, R.J. and Armstrong, R.A. (1992). New Pb, Sr and Nd isotope
data from the Karoo Province. Ext. Abs. Geocongress ’92, Geol. Soc.
S. Afr.
Preston, R. and Sweeney, R. J. (2003). A comparison of clinopyroxene
thermobarometric techniques: applied to Jwaneng, Orapa and Markt
kimberlites. 8th
Int. Kim. Conf. Ext. Abs. pp5.
Prozesky, V., Przybylowicz, W. and Sweeney, R.J., (1995). A comparison of PIXE
techniques with other microbeam methods. Abs. EUG Strasbourg,
Terra Nova, 7, 343.
Semytikivska, N., Ulmer, P and Sweeney, R. (2006). Picro-ilmenite: an experimental
study in simple and complex systems to investigate P-T-fO2-
composition relations at high pressure. Abstract, EMPG XI, Bristol.
Sweeney, R.J., Duncan, A.R. and Erlank, A.J. (1988). Three distinct magma types in
the Karoo of the central Lebombo and their petrogenetic significance.
Ext. Abs. Geocongress ’88, Geol. Soc. S. Afr., 621-624.
Sweeney, R.J. and Green, D.H. (1990). The role of crustal contamination in
Tasmanian dolerites. Abs. 7th
Int. Conf. Geochronology,
Cosmochronology and Isotope Geology, Canberra.
4. Sweeney, R.J., Thompson, A.B. and Ulmer, P. (1993). Phase relations of a natural
MARID composition and implications for genesis and lithospheric
melting. Abs. EUG Strasbourg, Terra Nova, 5, 538.
Sweeney, R.J., Prozesky, V. and Przybylowicz, W. (1994). Trace element
partitioning between silicate minerals and carbonatite and silicate melts
at 18kb to 46kb pressure. Abs. Goldschmidt Conf., Edinburgh, Min.
Mag., 58A, 885-886.
Sweeney, R.J. and Thompson, A.B. (1995). Peridotite and basalt solidii to 8GPa
under conditions of excess water. Abs. EUG Strasbourg, Terra Nova,
7, 145.
Sweeney, R.J., Thompson, A. and Prozesky, V. (1995). Peridotite-water relations:
solidii and solubilities at 3-8GPa. Abs. AGU Fall meeting.
Sweeney, R.J. (1996). The role of hydrogen in geological processes in the Earth’s
interior. Abs. Int. Conf. Solid State Protonic Conductors VIII,
Storefjell, Norway. (Invited presentation).
Ulmer, P. and Sweeney, R.J. (1993). Group II kimberlites – a potential source of
MARID’s carbonatites and mantle metasomatism. Abs. EUG
Strasbourg, Terra Nova, 5, 539.
Ulmer, P. and Sweeney, R.J. (1994). The origin of Group II kimberlites: an
experimental study. Abs. Experimental Petrology meeting, London
April 1994
Watkeys, M.K. and Sweeney, R.J. (1988). Tuli-Lebombo volcanism and
Gondwanaland rifting. Ext. Abs. Geocongress ’88, Geol. Soc. S. Afr.,
725-728.
Watkeys, M.K. and Sweeney, R.J.(1992). Crustal Provinces, mantle melts and Karoo
volcanism. Abs. AGU Montreal, 329.
Nov, 2006
Publications.RJS.doc