371 |
The geochemistry and crystallisation history of pyroxenes from hypabyssal basic igneous rocksJoyner, Louise January 1993 (has links)
No description available.
|
372 |
Quantifying the dissolution/precipitation geochemistry of fluid/rock interactions in reservoir systemsBunney, John Reuben January 1998 (has links)
No description available.
|
373 |
The geochemistry of the methylamines in recent marine and lacustrine sedimentsFitzsimons, Mark Francis January 1993 (has links)
No description available.
|
374 |
The distribution of uranium and thorium in the Cornubian batholithLucas, Frank W. A. A. January 1993 (has links)
No description available.
|
375 |
The separation and determination of rare earths in phosphate deposits from the north of the Kingdom of Saudi ArabiaMoufti, Asaad M. B. January 1987 (has links)
The use of an ion and cation exchange for the separation of rare earth elements from phosphate rocks were investigated. The cation exchange method was found to be most suitable. Rare earth elements separated in this way were analysed by atomic emission using an inductively coupled plasma. Compromise optimum conditions were found and the combined procedure used for thirty nine phosphate rock samples from Saudi Arabia. The results obtained were confirmed by internal checks on some samples using standard addition. In general, the recovery of individual rare earth elements is high but these vary from sample to sample depending on the sample composition.
|
376 |
A comparative organic geochemical and stable isotope study of the Cenomanian-Turonian organic-rich sediments from Tunisia, Germany and the UKBarrett, Paul January 1998 (has links)
A comparative multidisciplinary study has been undertaken of organic-rich Cenomanian-Turonian (C-T) sediments from Tunisia, Germany and the UK. Three hundred samples were taken from a total of 7 field localities and have been analysed using bulk and stable carbon isotope geochemistry (all samples), palynofacies (most samples) and molecular biomarker and pyrolysis geochemistry (selected samples). Most of the sections are thermally immature. All but one of the sections could be correlated using the organic carbon S13C curve, which shows a strong (<3%o) excursion at the C-T boundary, followed by a gradual return to background values (ca. -25.5%o). Relative to this excursion, there is a slight apparent difference in the stratigraphic development of the organic-rich sediments at different locations. Of the sediments studied, the Balhoul Formation of Tunisia shows the highest concentration and best preservation of organic matter (0.2-8.0% TOC, 50-850 hydrogen index); together with darker colours and more frequent lamination, this suggests a more poorly oxygenated regime than in NW Europe (0.2-4.0% TOC, 6-140 HI), probably related to an upwelling intensified oxygen minimum zone (OMZ) on the south Tethyan margin. Data from the two northernmost (offshore) Tunisian sections indicate poorer preservation, which by modem analogy is attributed to deeperwater deposition below the suboxic core of the OMZ. Methylhopanes and bisnorhopane are abundant in the richest (OMZ core) facies. Principal Component Analysis of kerogen pyrolysates from Py-GC and Py-MS analyses are dominated by the relative variations of aliphatic and aromatic compounds between the sections which largely reflect differences in the preservation of the predominantly marine organic matter (30-98% AOM).
|
377 |
Geochemical and isotopic constraints on the petrogenesis of the Cretaceous dykes of Rio de Janeiro, BrazilValente, Sergio de Castro January 1997 (has links)
No description available.
|
378 |
Geochemical and sedimentological controls on the origin of sandstone-hosted radioelement-rich bitumensVeale, Christopher J. January 1997 (has links)
No description available.
|
379 |
Biogeochemical prospecting applied to deposits of orthomagmatic copper-nickel-PGE, lode gold and lead in IrelandSmyth, D. January 2001 (has links)
No description available.
|
380 |
Characterisation of basaltic weathering products by modern analytical techniquesMcAlister, John J. January 1986 (has links)
No description available.
|
Page generated in 0.0167 seconds