Research Article| September 01, 1981 Effect of cooling on the water content and mechanical behavior of metamorphosed rocks Bruce W. D. Yardley Bruce W. D. Yardley 1School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, United Kingdom Search for other works by this author on: GSW Google Scholar Author and Article Information Bruce W. D. Yardley 1School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, United Kingdom Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1981) 9 (9): 405–408. https://doi.org/10.1130/0091-7613(1981)9<405:EOCOTW>2.0.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Bruce W. D. Yardley; Effect of cooling on the water content and mechanical behavior of metamorphosed rocks. Geology 1981;; 9 (9): 405–408. doi: https://doi.org/10.1130/0091-7613(1981)9<405:EOCOTW>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Calculations of the decline in fH2O in equilibrium with typical metamorphic assemblages during cooling indicate that there will be a large drop in pore-water pressure within 100° of the metamorphic maximum. The loss of pore fluid and the generation of large effective pressures across grain boundaries will inhibit rock deformation by those mechanisms that depend on the presence of an aqueous fluid phase. In many metamorphic belts, extensive deformation occurs below the metamorphic maximum during heating (that is, while fluid is being generated), whereas rocks do not deform in the same ductile manner on cooling, even while temperature is high. This may reflect changing mechanical properties of the rocks rather than merely changes in regional stresses; mobile belts could be made rigid in this way in about 20 m.y. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Deposition of Dalradian sediments in a stretching ensialic basin peripheral to Iapetus continued into Cambrian times. Late in the history of Dalradian deposition a southern continental landmass was removed by strike-slip motions and a subduction zone then developed beneath the Dalradian sediments. Deformation and moderately high pressure metamorphism of Dalradian rocks occurred and was followed by thermal relaxation and development of a volcanic arc with magmatic centres in Connemara by Tremadoc times and in NE Scotland by the Arenig. The S Mayo Trough was a back-arc basin that opened shortly after the initiation of the arc, the oldest volcanic rocks seen there being the extrusive equivalents of the basic intrusions of Connemara. Dalradian rocks outcropping in Ordovician times over the Highlands and probably extending southwards are a possible source for high pressure metamorphic clasts at Ballantrae, while clasts of arc volcanics may have come from N of the Highland Boundary Fault. Plate models that involve a separate arc in the Midland Valley are rejected because the tectonic elements are impossibly small by comparison with modern convergent plate margins. The arc rooted in Dalradian rocks ceased to be active at the end of the Llanvirn as a result of a further change in plate motions, and there are considerable spatial problems in locating an arc coupled to the Southern Uplands accretionary prism after Llanvirn times.
Perchuk L. L. (ed.) 1991. Progress in Metamorphic and Magmatic Petrology. A Memorial Volume in Honour of D. S. Korzhinskiy. xvi + 503 pp. Cambridge, New York, Port Chester, Melbourne, Sydney: Cambridge University Press. Price £75.00, US $100.00 (hard covers). ISBN 0 521 39077 X. - Volume 130 Issue 1
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