georefid:2006-091331SEDIS Publication Catalogue

ana.macario@awi.de

http://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1130/G22937A.12006-01-01publicationgeorefid:2006-091331doi:10.1130/G22937A.1Davies, Richard J.University of Durham, Centre for Research into Earth Energy Systems, Durham, United KingdomauthorHuuse, MadsUniversity of Aberdeen, Aberdeen AB24 3UE, United KingdomauthorHirst, PhilipBP, Middlesex TW16 7LN, United KingdomauthorCartwright, JoeCardiff University, Cardiff CF10 3YE, United KingdomauthorYang, YuesuoCardiff CF10 3YEauthorGeological Society of America (GSA), Boulder, CO, United StatespublisherdocumentHardcopyGeology (Boulder)34 (11)917-920Postdepositional sediment mobilization is a common phenomenon that occurs over large areas of sedimentary basins, usually within mudstone-rich successions; however, defining the exact mechanism that initiates this process has proved elusive. Here we describe a number of large-scale clastic intrusions (injectites), 50 to >300 m in height, hosted within fine-grained biosiliceous upper Eocene to Pliocene strata in four sedimentary basins. Within these basins diagenetic conversion of opal A into opal CT (cristobalite and tridymite) causes a marked reduction in sediment porosity and the liberation of bound water, often at relatively shallow burial (<0.5 km). We propose that this occurs over geologically short time periods over large expanses of sedimentary basins, causing rapid pore fluid expulsion and overpressure buildup within interbedded sands. The liberated fluids primed these sands, rendering them susceptible to remobilization. This mechanism should have broad applicability.completedSedimentary petrologyapplicationsAsiaAtlantic Oceanbasinsburial diagenesiscase studiesCenozoicclastic rocksCommonwealth of Independent StatescristobalitediagenesisEoceneFaeroe-Shetland Basinframework silicatesimpactitesinjectiteLeg 104marine sedimentsmetamorphic rocksNeogeneNorth AtlanticNorth SeaNortheast AtlanticOcean Drilling ProgramODP Site 643opalopal-Aopal-CToverpressurePaleogenePliocenepore pressurepore waterRussian FederationSakhalinSakhalin Russian Federationsedimentary basinssedimentary rockssedimentary structuressedimentssilicasilica mineralssilicatessoft sediment deformationTertiarytridymiteViking Grabenurn:org.iodp:exp:104urnlargerWorkCitationcampaignurn:org.iodp:exp:104:site:643urnlargerWorkCitationstudyurn:org.iodp:exp:104urnlargerWorkCitationcampaignEnglishgeoscientificInformation1.02001.020067.425467.4254