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Controls of tor formation, Cairngorm Mountains, Scotland
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology. Stanford University, USA.
Stockholm University, Faculty of Science, Department of Geological Sciences.
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
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2014 (English)In: Journal Of Geophysical Research: Earth Surface, ISSN 2169-9003, Vol. 119, no 2, 225-246 p.Article in journal (Refereed) Published
Abstract [en]

Tors occur in many granitic landscapes and provide opportunities to better understand differential weathering. We assess tor formation in the Cairngorm Mountains, Scotland, by examining correlation of tor location and size with grain size and the spacing of steeply dipping joints. We infer a control on these relationships and explore its potential broader significance for differential weathering and tor formation. We also assess the relationship between the formation of subhorizontal joints in many tors and local topographic shape by evaluating principle surface curvatures from a digital elevation model of the Cairngorms. We then explore the implications of these joints for tor formation. We conclude that the Cairngorm tors have formed in kernels of relatively coarse grained granite. Tor volumes increase with grain size and the spacing of steeply dipping joints. We infer that the steeply dipping joints largely formed during pluton cooling and are more widely spaced in tor kernels because of slower cooling rates. Preferential tor formation in coarser granite with a wider joint spacing that is more easily grusified indicates that joint spacing is a dominant control on differential weathering. Sheet jointing is well developed in tors located on relatively high convex surfaces. This jointing formed after the gross topography of the Cairngorms was established and before tor emergence. The presence of closely spaced (tens of centimeters), subhorizontal sheeting joints in tors indicates that these tors, and similarly sheeted tors elsewhere, formed either after subaerial exposure of bedrock or have progressively emerged from a regolith only a few meters thick. Key Points <list list-type=bulleted id=jgrf20195-list-0001> <list-item id=jgrf20195-li-0001>Tors form in kernels of coarse-grained granite among finer-grained granite <list-item id=jgrf20195-li-0002>Wide joint spacing in tors attributable to a slow cooling rate of the granite <list-item id=jgrf20195-li-0003>Sheet jointing discounts tor formation within a thick regolith

Place, publisher, year, edition, pages
2014. Vol. 119, no 2, 225-246 p.
Keyword [en]
Cairngorm Mountains, granite, joint, cooling rate, tor, weathering
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-104577DOI: 10.1002/2013JF002862ISI: 000333032300009OAI: oai:DiVA.org:su-104577DiVA: diva2:723861
Note

AuthorCount:6;

Available from: 2014-06-11 Created: 2014-06-11 Last updated: 2014-06-18Bibliographically approved

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Goodfellow, Bradley W.Skelton, AlasdairStroeven, Arjen P.Jansson, Krister N.Hättestrand, Clas
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Department of Physical Geography and Quaternary GeologyDepartment of Geological Sciences
Earth and Related Environmental Sciences

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