A structural study of the granitic gneiss and associated Moinian rocks between Loch Shiel and Loch Eil, Argyll and Inverness-shire

Synopsis The paper provides the first detailed geological description of a portion of the Grampian Highlands between Glen Roy in the west and the Monadhliath Mountains in the east. Moinian metasediments comprising thick granulites (Eilde Flags = Central Highland Psammitic Group) followed by a variable series of pelites and impersistent quartzites (Monadhliath Schists = Transition Group) are succeeded by Dalradian Limestone (Kinlochlaggan or Ballachulish Limestone = Basal Calcareous Group). The Monadhliath Schists are shown to be stratigraphically equivalent to those of Lochaber below the Ballachulish Limestone. Structurally the area consists of north-easterly anticlines and synclines which are generally isoclinal and often overturned. Many formational junctions are clearly stratigraphical, but the point is discussed whether tectonic contacts (slides) may also be present. Most of the metasediments are of garnet grade, but in the east there is a poorly-developed kyanite zone, and a well-developed sillimanite zone. The high-grade zones are related to a major migmatite and pegmatite belt (the Strathspey Complex); another pegmatite belt occurs farther west around Loch Laggan. Post-tectonic granite, quartz-diorite, diorite and appinite intrusions are also present. The district is traversed by several important north-easterly faults which are later than both the metasediments and the intrusions.

Dalradian

Pegmatite

Diorite

Anticline

Syncline

Sillimanite

Greisen

Geosyncline

Conglomerate

10.1017/s0080456800002994

Cite

Citations (50)

The geology of the Moine rocks of the Loch Eil area, west Inverness-shire

Robin A. Strachan

Shire

West coast

Source

Cite

Citations (1)

On the Chemical Composition of the Mineral Bruiachite, found by Mr. Thomas D. Wallace, of Inverness, at Loch Bhruithaich, Inverness-shire

Mineralogical Magazine and Journal of the Mineralogical Society (1886)

W. Ivison Macadam

In a paper read before this Society on June 16th, 1885, Mr. Wallace drew attention to this mineral as being found at Loch Bhruithaich, and stated that it was obtained incrusting Barytes. The mineral is clear, beautifully crystalline, with a tendency to a bluish tinge of colour, and very friable.

Shire

10.1180/minmag.1886.007.32.09

Cite

Citations (1)

The structural geology of a double fold system at Loch Monar, Inverness-shire and Ross-shire

Gollings John

Shire

Source

Cite

Citations (1)