Tectonic history of the ophiolitic rocks of the Highland Border fracture zone, Scotland; stable isotope evidence from rock-fluid interactions during obduction

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doi: 10.1016/0040-1951(84)90220-8
Authors:Ikin, Nicholas P.; Harmon, Russell S.
Author Affiliations:Primary:
Univ. Coll., Dep. Geol., Cardiff, United Kingdom
South. Method. Univ., United States
Volume Title:Tectonophysics
Source:Tectonophysics, 106(1-2), p.31-48. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0040-1951
Publication Date:1984
Note:In English. 31 refs.; illus. incl. geol. sketch map
Summary:During the early stages of obduction, young hot peridotite slabs were thrust over the cold upper surfaces of lower thrust sheets, producing a dynamothermal metamorphic sole. Serpentinization of these peridotites, while they were still cooling, occurred in a near-surface position through the interaction of meteoric waters. Subsequently, the ophiolitic thrust-sheets, which comprise lizardite serpentinites, spilitic pillow lavas, and aureole rocks, were thrust over the uppermost Dalradian nappes which were themselves being expelled southwards, thereby accommodating basement shortening. Grampian regional metamorphism of the nappe pile and overlying Highland Border Suite ophiolitic thrust sheets, produced greenschist metaspilites from the spilitic pillow lavas, induced minor retrogression in the aureole rocks, and caused the lizardite in the serpentinites to be recrystallized and replaced by antigorite.—Modified journal abstract. [A.W.H.]
Subjects:Basins; Cambrian; D/H; Dalradian; Deuterium; Facies; Faults; Fluid phase; Fracture zones; Geochemistry; Grampian Orogeny; Gravity sliding; Greenschist facies; Hydrogen; Isotopes; Marginal basins; Metaigneous rocks; Metamorphic rocks; Metamorphism; Metasomatism; O-18/O-16; Obduction; Ophiolite; Ordovician; Orogeny; Oxygen; Paleozoic; Plate tectonics; Precambrian; Proterozoic; Regional metamorphism; Serpentinization; Solid phase; Stable isotopes; Structural geology; Tectonics; Tectonophysics; Thrust faults; Upper Precambrian; Caledonides; Europe; Great Britain; Midland Valley; Scotland; United Kingdom; Western Europe; Evolution; Highland Border fracture zone
Coordinates:N560000 N570000 W0020000 W0050000
Abstract Numbers:87M/6817
Record ID:1984051675
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute.
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