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Recognition of abnormal thermal histories of Jurassic source rocks from integrated analyses of vitrinite reflectance and organic matter colour / fluorescence
McCaughan, Gerard A.
THESIS 7071 By investigating three sedimentary horizons through the aureole of a Tertiary dyke intruding a Middle Jurassic sedimentary section in NE Skye, the thermal response rates of the various organic maturity indicators to short-term high temperature heating events were evaluated. A detailed assessment was conducted, of the reaction of vitrinite reflectance (VR), kerogen colour and fluorescence, to the short-lived high temperatures associated with the dyke. Image analysis (lA) techniques were applied to develop a new system for vitrinite reflectance measurement at Trinity College Dublin. Vitrinite reflectance shows a marked reaction to the high temperatures close to the dyke. Within a zone equivalent to ca. 50% dyke thickness (d.t.), rank changes from the high-volatile bituminous (0.72-0.79% Rr) through medium volatile bituminous, low volatile bituminous, semi-anthracite to anthracite (3.1-3.6% Rr) are observed. Reflectance reversals, previously reported adjacent to igneous intrusions, were not observed in any of the sample horizons. Peak palaeotemperatures in excess of 300°C, computed from the measured VR data, are indicated in the host rocks adjacent to the dyke contact.
Keyword(s): Geology, Ph.D.; Ph.D. Trinity College Dublin
Publication Date:
2002
Type: Doctoral thesis
Peer-Reviewed: Unknown
Language(s): English
Institution: Trinity College Dublin
Citation(s): Gerard A. McCaughan, 'Recognition of abnormal thermal histories of Jurassic source rocks from integrated analyses of vitrinite reflectance and organic matter colour / fluorescence', [thesis], Trinity College (Dublin, Ireland). Department of Geology, 2002, pp 330
Publisher(s): Trinity College (Dublin, Ireland). Department of Geology
Supervisor(s): Allen, Philip
First Indexed: 2016-12-02 08:19:23 Last Updated: 2016-12-02 08:19:23