Kathryn M Gillis
Université de Montréal
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Chemical Geology | 1992
Kathryn M Gillis; John N Ludden; Alan D. Smith
REE data for secondary minerals from low- and high-temperature alteration environments in the Troodos Ophiolite have been determined using a combined mass spectrometry-neutron activation technique. Smectite- and analcime-REE mimic fresh rock profiles and have concentrations ranging from < 1–5 times chondritic values. Celadonite is depleted in LREE and total REE relative to the rocks. Groundmass-replacing chlorite and epidote are similar to, or enriched in, REE relative to fresh rocks. In contrast, fault-related chlorite and void-filling epidote are LREE-enriched with large positive Eu anomalies and yield comparable REE profiles to those of hydrothermal fluids venting at mid-ocean ridges. The zeolites, clinoptilolite and laumontite, are also LREE-enriched with REE contents significantly lower than rock values. Carbonate is enriched in HREE relative to LREE and concentrations vary from 0.2 to 18 times chondritic values. REE data for these minerals indicate that seawater-REE contents are modified by seawater-rock interaction in volcanic sequences and sheeted dykes in oceanic crust during axial hydrothermal alternation and subsequent crustal aging. The absolute and relative abundances of REE in seawater-derived solutions evolve in response to the precipitation of secondary minerals and the prevailing water/rock ratios. Rocks altered at low temperatures will show no change or a decrease in REE content; the LREE/HREE ratio will reflect the proportion of smectite, celadonite and carbonate in the groundmass assemblage. In contrast, rocks altered at high temperatures will show no change or an increase in REE; the LREE/HREE ratio will reflect the proportion of void-filling and groundmass-replacing chlorite and epidote in the rock.
Chemical Geology | 1990
Alan D. Smith; Kathryn M Gillis; John N Ludden
Abstract PIGS is a pre-irradiation group separation technique for the analysis of REE by neutron activation which is used in conjunction with Nd isotopic studies. Removal of interfering and background-producing matrix elements allows the analysis of up to 12 REE within 12 days of irradiation by use of their shorter-lived radioisotopes. Small samples and samples with high Fe, Th or U, may be analysed with superior precision and detection limits compared to conventional INAA.
Archive | 1990
Kathryn M Gillis; Alan D. Smith; John N Ludden
Archive | 1992
Kathryn M Gillis; John N Ludden; Terry Plank; Lawrence D Hoy
Supplement to: Gillis, Kathryn M; Ludden, John N; Plank, Terry; Hoy, Lawrence D (1992): Low-temperature alteration and subsequent reheating of shallow oceanic crust at Hole 765D, Argo Abyssal Plain. In: Gradstein, FM; Ludden, JN; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 123, 191-199, doi:10.2973/odp.proc.sr.123.157.1992 | 1992
Kathryn M Gillis; John N Ludden; Terry Plank; Lawrence D Hoy
In supplement to: Gillis, KM et al. (1992): Low-temperature alteration and subsequent reheating of shallow oceanic crust at Hole 765D, Argo Abyssal Plain. In: Gradstein, FM; Ludden, JN; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 123, 191-199, https://doi.org/10.2973/odp.proc.sr.123.157.1992 | 1992
Kathryn M Gillis; John N Ludden; Terry Plank; Lawrence D Hoy
In supplement to: Gillis, KM et al. (1992): Low-temperature alteration and subsequent reheating of shallow oceanic crust at Hole 765D, Argo Abyssal Plain. In: Gradstein, FM; Ludden, JN; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 123, 191-199, https://doi.org/10.2973/odp.proc.sr.123.157.1992 | 1992
Kathryn M Gillis; John N Ludden; Terry Plank; Lawrence D Hoy
In supplement to: Gillis, KM et al. (1992): Low-temperature alteration and subsequent reheating of shallow oceanic crust at Hole 765D, Argo Abyssal Plain. In: Gradstein, FM; Ludden, JN; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 123, 191-199, https://doi.org/10.2973/odp.proc.sr.123.157.1992 | 1992
Kathryn M Gillis; John N Ludden; Terry Plank; Lawrence D Hoy
In supplement to: Gillis, KM et al. (1992): Low-temperature alteration and subsequent reheating of shallow oceanic crust at Hole 765D, Argo Abyssal Plain. In: Gradstein, FM; Ludden, JN; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 123, 191-199, https://doi.org/10.2973/odp.proc.sr.123.157.1992 | 1992
Kathryn M Gillis; John N Ludden; Terry Plank; Lawrence D Hoy
Supplement to: Gillis, KM et al. (1990): Trace element and sr-isotopic contents of hydrothermal clays and sulfides from the Snake Pit hydrothermal field: ODP Site 649. In: Detrick, R; Honnorez, J; Bryan, WB; Juteau, T; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 106/109, 315-319, https://doi.org/10.2973/odp.proc.sr.106109.164.1990 | 1990
Kathryn M Gillis; Alan D. Smith; John N Ludden
