Deformation temperatures, vorticity of flow and strain symmetry in the Loch Eriboll mylonites, NW Scotland: implications for the kinematic and structural evolution of the northernmost Moine Thrust zone

Thigpen, J. Ryan; Law, Richard D.; Lloyd, Geoffrey E.; Brown, Summer J.; Cook, Brian

doi:10.1144/sp335.26

Cited by 35 publications

(41 citation statements)

References 98 publications

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“…It is now known that these zones form boundaries between the major sub-divisions of the Moine (see Fig. 1 and Thigpen et al 2010).…”

Section: Differentiating Mylonites From Schists or Where Do The Moinementioning

confidence: 99%

“…Murchison went on to refute Nicol's interpretation strongly in a footnote in his 1858 paper (Murchison 1858b) and continued this refutation in three papers published both before (Murchison 1859) and after (Murchison & Geikie 1861a, b) the publication of Nicol's 1860 paper. (Supplied by Ryan Thigpen, based on Krabbendam et al 2008, also see Thigpen et al 2010. ) Nicol (1860) concluded that 'the line of junction, where this conformable succession is said to occur, is clearly a line of fault, everywhere indicated by proofs of fracture, contortion of the strata, and powerful igneous action'.…”

Section: Geological Observations Leading To the Highland Controversymentioning

confidence: 99%

“…Geological map of NW Scotland showing the Moine Thrust Zone, the Ben Hope Slide or Thrust, the Sgurr Beag-Naver Slide or Thrust and the Great Glen Fault (GGF). (Supplied by Ryan Thigpen, modified from Krabbendam et al 2008; also see Thigpen et al 2010. ) et al 1888) led to the structural unravelling of the Eriboll area and the subsequent closure of the Highland Controversy.…”

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confidence: 99%

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Mylonites: lessons from Eriboll

White

2010

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Eriboll has been an important area in understanding the geology and structure of the NW Highlands of Scotland. It came to prominence during the Highland Controversy between Nicol and Murchison in the 1850s. Nicol recognized a major regional, or grand, dislocation (the Moine Thrust Zone) at Eriboll whereas Murchison denied its existence. An important element in the resolution of the controversy was the repeated observation of a distinctive schistose rock that often marked Nicol's dislocation. Lapworth named it a ‘mylonite’ and related its development to mechanical metamorphism resulting from tectonic (milling) movements along the dislocation. Peach, Horne and co-workers, whose contributions to early mylonite studies are often overlooked, described the effects of increasing strain on mylonite development, recorded the prominent lineation within mylonites and identified its kinematic significance via thrust geometries and a first use of shear sense indicators. In this contribution those elements of the Highland Controversy that led to the identification of mylonites will be reviewed, concentrating on the contributions of Lapworth and of Peach, Horne and co-workers. It will include an examination and discussion of the mylonites from Lapworth's locality and of the mylonitized Moine schists at Eriboll. It will conclude with comments on mylonite classification and nomenclature.

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“…It is now known that these zones form boundaries between the major sub-divisions of the Moine (see Fig. 1 and Thigpen et al 2010).…”

Section: Differentiating Mylonites From Schists or Where Do The Moinementioning

confidence: 99%

Section: Geological Observations Leading To the Highland Controversymentioning

confidence: 99%

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confidence: 99%

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Mylonites: lessons from Eriboll

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2010

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“…Work has previously focussed on aluminium in quartz [Dennen et al, 1970;Götze et al, 2001], 'fractal' geometry [Kruhl and Nega, 1996;Mamtani and Greiling, 2010;Wu et al, 2006], thermoluminescence [Sawakuchi et al, 2011], caxis opening angles [e.g. Thigpen et al, 2010] and importantly for this study, titanium in quartz [Wark and Watson, 2006] to give quartz crystallisation temperatures, with variable success.…”

Section: ) Introductionmentioning

confidence: 99%

Using titanium-in-quartz geothermometry and geospeedometry to recover temperatures in the aureole of the Ballachulish Igneous Complex, NW Scotland

Morgan

Jollands

Lloyd

et al. 2013

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Titanium--in--Quartz geothermometry, originally pioneered by Wark and Watson [2006] then later modified by Kawasaki and Osanai [2008] and Thomas et al. [2010] promises accurate quartz crystallisation temperature determinations from straightforward measurements of Ti within the quartz lattice. These geothermometers are tested by applying them to a suite of contact metamorphosed quartzites from around the Ballachulish Igneous Complex in West Scotland. Results show that the original Ti--in--Quartz geothermometer gives results broadly in agreement with thermal modelling and pre--existing geothermometry data from Ballachulish and the latter geothermometers give temperatures which are consistently too low. However, despite a broad agreement between published temperature values and those derived from the original thermometer of Wark and Watson [2006], there is a lack of correlation between distance from the igneous contact and determined temperature, as well as unacceptably large errors in some cases. Furthermore, a rigorous test of the methodology employed in this and other studies suggests that the system is more complex than assumed, and a greater understanding of the substitution of other elements in quartz (such as aluminium) is necessary. In addition, various issues have been raised by other workers regarding the validity of Ti--in--Quartz as a geothermometry tool at all, inasmuch as the original equations were constructed with a disregard for a range of complicating factors. This study adds further weight to a growing mass of critiques of this technique of geothermometry and suggests a much greater understanding of the processes is necessary before Ti--in--Quartz can be convincingly upheld as a viable tool.

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“…1) date around 600 Ma and have been linked to late Neoproterozoic rifting of Rodinia (Kinny et al 2003b;Oliver et al 2008). Metamorphic grade in the Morar Group reached middle amphibolite-facies grade (Fettes et al 1985;Thigpen et al 2010): kyanite has overgrown andalusite in the thermal aureole of the Carn Chuinneag granite (Tilley 1935, Wilson & Shepherd 1979, attesting to at least medium-high pressures during Caledonian orogenesis.…”

Section: Geological Settingmentioning

confidence: 99%