Abstract
The lower Eocene Rhum Central complex has a core of ultra-basic rocks and gabbros which formed at a late stage in the centre’s evolution. Three major components are recognised: the Eastern Layered Series of alternating layers (up to 80m thick) of feldspathic perioditite and allivalite, totalling c. 600m in thickness; the Western Layered Series of layered gabbros conformably overlain by layered feldspathic peridotites; and a later intrusive Central Series consisting of feldspathic peridotites and subordinate gabbros, dunites and layered allivalites. The Central Series is noteworthy for its abundant development of ultrabasic breccias. Emplacement of the ultrabasic and gabbroic rocks was initially controlled by the Main Ring Fault but the Long Loch Fault zone exercised control during intrusion of the Central Series. The Eastern and Western Layered Series are considered to be parts of a once-continuous steep-sided intrusion with a domed roof that extended only slightly above the level of the Rhum mountains (c.800m altitude).
Published Version
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