Multiple post-Caledonian exhumation episodes across NW Scotland revealed by apatite fission-track analysis

• Published in: Journal of the Geological Society Vol. 167; no. 4; pp. 675 - 694
• Main Authors: Holford, Simon P, Green, Paul F, Hillis, Richard R, Underhill, John R, Stoker, Martyn S, Duddy, Ian R
• Format: Journal Article
• Language: English
• Published: London, UK Geological Society of London 01.07.2010; The Geological Society of London; Geological Society; Geological Society Publishing House
• Subjects: apatite; Argyllshire Scotland; burial; Cenozoic; cooling; Crystalline rocks; cyclic processes; denudation; Earth sciences; Earth, ocean, space; Europe; Exact sciences and technology; exhumation; fission-track dating; Geology; Great Britain; Hebrides; Highland region Scotland; hydrothermal conditions; Igneous and metamorphic rocks petrology, volcanic processes, magmas; Inner Hebrides; Inverness-shire Scotland; Isle of Skye; Mesozoic; Morvern; Mull Island; northwestern Scotland; paleotemperature; phosphates; Plate tectonics; Scotland; Sea level; Strathclyde region Scotland; Stratigraphy; Structural geology; tectonics; thermal history; Topography; United Kingdom; uplifts; vertical movements; Western Europe; United Kingdom; Scotland; Great Britain; Europe; Western Europe; British Isles, Scotland; thermal history; basement; Mesozoic; Neogene; Permian; denudation; thickness; plumes; upper Tertiary; cycles; outliers; Precambrian; apatite; Triassic; burial; sedimentary cover; heat flow; Cenozoic; onshore; fission tracks; emergence; Tertiary; exhumation; hydrothermal activity; Cretaceous; offshore; Paleozoic; Jurassic; upper Paleozoic; phosphates; cooling; Phanerozoic
• ISSN: 0016-7649; 2041-479X
• DOI: 10.1144/0016-76492009-167

The post-Caledonian exhumation history of NW Scotland is a controversial issue, with some studies advocating largely continual emergence whereas others suggest dominantly early Palaeogene plume-driven exhumation. Apatite fission-track analysis (AFTA) data for samples of Precambrian basement and Permian-Cretaceous sediments from onshore and offshore reveal multiple phases of post-Caledonian cooling: Triassic (beginning 245-225 Ma), Cretaceous (140-130 Ma; 110-90 Ma) and Cenozoic (65-60 Ma; 40-25 Ma; 15-10 Ma), all of which are interpreted at least in part as recording exhumation. Basement and sedimentary cover rocks display similar thermal histories, emphasizing the regional nature of these episodes and implying that sedimentary outliers represent the remnants of previously more extensive sequences. Significant thicknesses of Jurassic rocks may once have covered NW Scotland. Palaeocene palaeothermal effects are most pronounced in the vicinity of igneous centres, probably reflecting combined effects of heating by elevated heat flow, deeper burial and hydrothermal activity. Most of the region underwent kilometre-scale Neogene exhumation. Contrary to the common assumption of monotonic cooling and denudation histories, integration of geological evidence with AFTA data defines an episodic thermal history involving repeated cycles of burial and exhumation. We suggest that onshore passive margins and continental interiors may also best be characterized by similar histories.