Developments in sedimentary provenance studies by A. C. Morton, Seldon P., Jr. Todd, P. D. W. Haughton

By A. C. Morton, Seldon P., Jr. Todd, P. D. W. Haughton

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The potential value of tourmaline compositional data in provenance studies is high, not least because of its great stability; it is considered to be one of the so-called 'ultrastable' heavy minerals. Tourmaline geochemistry could be particularly powerful when used in combination with optically-based varietal studies. MORTON elements in detrital zircons from Oligocene sediments from the Lough Neagh Group of Northern Ireland has greatly aided the understanding of the provenance of these sediments (Shukla 1988).

11, and so identification of source type is possible, although mixing from different sources, either because of source area complexity or because of recycling and diagenesis, may intro- duce considerable complications. For example, the assemblage in Fig. 10a is likely to have been sourced by amphibolite-facies rocks (Fig. 11), but the assemblage in Fig. 10e probably represents a mixture of source types. 5 km are generally garnet-free due to dissolution by high-temperature porefluids. Because of the chemical variations shown by the group, different garnets have different stabilities, with low-Ca garnets being more stable than high-Ca garnets (Morton 1987b).

Provenance of Oligocene Lough Neagh Group, Northern Ireland, United K i n g dom (abstract). In: JAMES, D. P. 8s LECKIE, D. A. (eds) Sequences, stratigraphy, sedimentology: surface and subsurface. Memoir of the Canadian Society of Petroleum Geologists, 15, 583-584. SMALE, D. 8s MORTON, A. C. 1988. Heavy mineral suites of core samples from the McKee Formation (Eocene-Lower Oligocene), Taranaki: implications for provenance and diagenesis. New Zealand Journal of Geology and Geophysics, 30, 299-306.

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