PUBLICATIONS: GRT Jenkin (ordering)


Gawen Jenkin May 1, 1998   Return to publications   Go to homepage

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[1]. Jenkin, G.R.T., Mohr, P., Mitchell, J.G. & Fallick, A.E. (1998). Carboniferous dykes as monitors of post-Caledonian fluid events in West Connacht, Ireland. Trans. R. Soc. Edinb., 89, 225-243.

The bottom line: Data can be interpreted to indicate a major fluid event affected the region in the Upper Triassic (~210 Ma), backing up the conclusions made by O'Reilly et al. (1997).

[2]. Jenkin, G.R.T. (1997). Mode effects on cooling rate estimates from Rb-Sr data Geology, 25, 907-910.

The bottom line: Mica Rb-Sr ages may give erroneous cooling paths if rock mode is not taken into consideration.

[3]. O'Reilly, C., Jenkin, G.R.T., Feely, M., Alderton, D.H.M. & Fallick, A.E., (1997). A fluid inclusion and stable isotope study of 200 Ma of fluid evolution in the Galway Granite, Connemara, Ireland. Contrib. Mineral. Petrol. 129, 120-142.

The bottom line: Some mineralisation which is spatially related to a granite may be much later than the age of intrusion, and unrelated to magmatic heat.

[4]. O'Hara, K.D., Sharp, Z.D., Moecher, D.P. & Jenkin, G.R.T., (1997). The effect of deformation on oxygen isotope exchange in quartz and feldspar and the significance of isotopic temperatures in mylonites. J. Geol. 105, 193-204.

The bottom line:

[5]. Wilkinson, J.J., Jenkin, G.R.T., Fallick, A.E. & Foster, R.P. (1995). Oxygen and hydrogen isotopic evolution of Variscan crustal fluids, south Cornwall, U.K. Chem. Geol. (Isot. Geosci.) 123, 239-254.

The bottom line: Analysis of carefully characterised samples documents the evolution of fluid compositions in a metamorphic belt.

[6]. Jenkin, G.R.T., Rogers, G., Fallick, A.E. & Farrow, C.M. (1995). Rb-Sr closure temperatures in bi- mineralic rocks; a mode effect and test for different diffusion models. Chem. Geol. (Isot. Geosci.) 122, 227-240.

The bottom line: The Rb-Sr age given by a mica grain is predicted to be dependent on the mode of the rock.

[7]. Jenkin, G.R.T., Craw, D. & Fallick, A.E. (1994). Stable isotopic and fluid inclusion evidence for meteoric fluid penetration into an active mountain belt; Alpine Schist, New Zealand J. metamorphic Geol. 12, 429-444.

The bottom line: 18O-shifted meteoric waters can lie in Sheppard's magmatic and metamorphic water box and be lithostatically pressured, hence appearing to be of deep origin.

[8]. Dempster, T.J., Jenkin, G.R.T. & Rogers, G. (1994). The origin of rapakivi texture. J. Petrol. 35, 963-981.

The bottom line: Isotopic measurements demonstrate that development of rapakivi texture continues over a prolonged period, perhaps up to 200 Ma.

[9]. Jenkin, G.R.T., Farrow, C.M., Fallick, A.E. & Higgins, D. (1994). Oxygen isotope exchange and closure temperatures in cooling rocks. J. metamorphic Geol. 12, 221-235.

The bottom line: Closure temperatures in oxygen isotope systems depend on the mode of the rock.

[10]. Sharp, Z.D. & Jenkin, G.R.T. (1994). An empirical estimate of the diffusion rate of oxygen in diopside. J. metamorphic Geol. 12, 89-97.

The bottom line: A field test confirms that the diffusion of oxygen is extremely slow under anhydrous conditions.

[11]. Curtis, S.F., Pattrick, R.A.D., Jenkin, G.R.T., Fallick, A.E., Boyce, A.J. & Treagus, J.E. (1993). Stable isotopes and fluid inclusions of fault related mineralisation at Tyndrum, Scotland. Trans. Inst. Mining Metall. 102, B39-47.

The bottom line: The fluid depositing the gold veins has stable isotope ratios consistent with a magmatic origin. However, see Jenkin, Craw and Fallick (1994 - above).

[12]. Gallagher, V., Feely, M., Högelsberger, H., Jenkin, G.R.T. & Fallick, A.E. (1992). Geological, Fluid inclusion and stable isotope studies of Mo mineralisation, Galway Granite, Ireland. Mineral. Dep. 27, 314-325.

The bottom line: Mo-mineralisation is undoubtedly of magmatic origin, but what about the late overprint?

[13]. Jenkin, G.R.T., Fallick, A.E. & Leake, B.E. (1992) A stable isotope study of retrograde alteration in S.W. Connemara, Ireland. Contrib. Mineral. Petrol. 110, 269-288.

The bottom line: Widespread infiltration of meteoric fluid, but when??

[14]. Miller, W.M., Fallick, A.E., Leake, B.E., Macintyre, R.M. & Jenkin, G.R.T. (1991). Fluid disturbed hornblende K-Ar ages from the Dalradian rocks of Connemara, Western Ireland. J. Geol. Soc. Lond. 148, 985-992.

The bottom line: Closure temperature affected by fluid, the origin of the fluid and precise mechanism still in doubt.

[15]. Jenkin, G.R.T., Linklater, C. & Fallick, A.E. (1991). Modeling of mineral d18O values in an igneous aureole: Closed-system model predicts apparent open-system d18O values. Geology 19, 1185-1188.

The bottom line: Uses COOL to demonstrate you do not always need fluid infiltration to produce reversed (negative) quartz-K-feldspar oxygen isotope fractionations.

[16]. Jenkin, G.R.T., Fallick, A.E., Farrow, C.M. & Bowes, G.E. (1991). COOL: A FORTRAN-77 computer program for modeling stable isotopes in cooling closed systems. Computers & Geosciences 17 (3), 391- 412.

The bottom line: The original and best O-isotope modelling program implements Giletti's (1986) model.

[17]. Dempster, T.J., Hutton, D.H.W., Harrison, T.N., Brown, P.E. & Jenkin, G.R.T. (1991). Textural evolution of the Rapakivi granites of S. Greenland: Sr, O and H isotopic investigations. Contrib. Mineral. Petrol. 107, 459-471.

The bottom line: First paper to show importance of prolonged low temperature elemental redistribution in rapakivi texture.

[28]. Jenkin, G.R.T., Fallick, A.E. & Farrow, C.M. (1989). COOL: Computer program for modelling stable isotopes in cooling closed systems. User manual and documentation. S.U.R.R.C. report. 113p.

Note: a software version of this can be obtained online.

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