Editing Moine geology of the Ross of Mull - an excursion

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{{MoineEx}}
 
{{MoineEx}}
 
== By Tony Harris ==
 
== By Tony Harris ==
[[File:EGS_MOI_Fig_01_01.jpg|thumbnail|Fig. 1.1 Simplified geology map of the Ross of Mull, showing the localities described in the text.]]
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[[File:EGS_MOI_Fig_01_02.jpg|thumbnail|Fig. 1.2 NW-SE cross-section across the Moine rocks of the Ross of Mull (modified from Holdsworth et al., 1987).]]
 
  
 
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==== Excursion 1 Ross of Mull is composed of the following articles: ====
 
* [[Moine geology of the Ross of Mull - an excursion|Excursion 1 Ross of Mull - introduction]]
 
* [[Moine geology of the Ross of Mull. Itinerary A. Eastern limb of the Assapol Synform (1) - an excursion|Itinerary A. Eastern limb of the Assapol Synform (1). Localities 1.1 to 1.7.]]
 
* [[Moine geology of the Ross of Mull. Itinerary B. Eastern limb of the Assapol Synform (2) - an excursion|Itinerary B. Eastern limb of the Assapol Synform (2). Localities 1.8 - 1.14.]]
 
* [[Moine geology of the Ross of Mull. Itinerary C. Structure and lithologies within the Ardalanish Striped and Banded Formation, western linb of the Assapol Synform - an excursion|Itinerary C. Structure and lithologies within the Ardalanish Striped and Banded Formation, western linb of the Assapol Synform. Localities 1.15 - 1.20.]]
 
* [[Moine geology of the Ross of Mull. Itinerary D. Western limb and core of the Assapol Synform - an excursion|Itinerary D. Western limb and core of the Assapol Synform. Localities 1-21 - 1.25.]]
 
 
 
The Moine rocks of the Ross of Mull ([[Media:EGS_MOI_Fig_01_01.jpg|(Fig. 1.1)]], [[Media:EGS_MOI_Fig_01_02.jpg|(Fig. 1.2)]]) constitute the south-westernmost occurrence of the Supergroup. The inlier contains evidence that is critical in assessing the stratigraphic relationships between the Morar and Glenfinnan groups which are, respectively, thought to be laterally equivalent to the Shiaba and Assapol groups of Mull (Holdsworth ''et al''., 1987). The Moine outcrop is terminated to the west by the Ross of Mull Granite which was intruded towards the end of the Caledonian orogeny at 421 ± 5 Ma (Oliver ''et al''., 2008). Lewisian basement and Iona Group cover rocks of the Caledonian foreland occur on the island of Iona directly west of the Ross of Mull. The mid-amphibolite facies metamorphic grade of the Moine rocks is anomalously high for rocks adjacent to the Moine Thrust and the Caledonide foreland (Holdsworth ''et al''., 1987). The former had been inferred to lie in the Sound of Iona, and Potts ''et al''. (1996) concluded that it had been displaced by a major normal fault. This structure had brought Moine rocks of the Knoydart Nappe into contact with the rocks of the foreland before emplacement of the Ross of Mull Granite.
 
The Moine rocks of the Ross of Mull ([[Media:EGS_MOI_Fig_01_01.jpg|(Fig. 1.1)]], [[Media:EGS_MOI_Fig_01_02.jpg|(Fig. 1.2)]]) constitute the south-westernmost occurrence of the Supergroup. The inlier contains evidence that is critical in assessing the stratigraphic relationships between the Morar and Glenfinnan groups which are, respectively, thought to be laterally equivalent to the Shiaba and Assapol groups of Mull (Holdsworth ''et al''., 1987). The Moine outcrop is terminated to the west by the Ross of Mull Granite which was intruded towards the end of the Caledonian orogeny at 421 ± 5 Ma (Oliver ''et al''., 2008). Lewisian basement and Iona Group cover rocks of the Caledonian foreland occur on the island of Iona directly west of the Ross of Mull. The mid-amphibolite facies metamorphic grade of the Moine rocks is anomalously high for rocks adjacent to the Moine Thrust and the Caledonide foreland (Holdsworth ''et al''., 1987). The former had been inferred to lie in the Sound of Iona, and Potts ''et al''. (1996) concluded that it had been displaced by a major normal fault. This structure had brought Moine rocks of the Knoydart Nappe into contact with the rocks of the foreland before emplacement of the Ross of Mull Granite.
  

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