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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: 2017-07-05 05:33:25