{"refrec":{"BRefID":67482,"RR":"<b>Nijs, R.</b> (1975). Mineralogical composition and origin of marine clays in the Poitou coastal plain (France). <i>Pedologie 25(2)</i>: 126-133","BEntID":63831,"PublicFlag":1,"CheckedFlag":0,"wosflag":null,"vabbflag":null,"RefStringPartII":". <i>Pedologie 25(2)</i>: 126-133","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Nijs, R.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Nijs, R.","Englishabstract":"The mineralogical composition of a well-chosen set of Holocene marine clay samples from the Marais Poitevin, tbe most important coastal marsh of France, consists of well-crystallized illite and kaolinite, and an important amount of beidellite. Chlorite, vermiculite and other interstratified clay minerals only occur in small amount.There is a clear qualitative parenthood between this composition and that of the recent alluvium of the local rivers, which makes a far origin of the marine clay superfluous. Quantitatively however, the alluvium shows a lower illite content and a dominance of (mostly interstratified) illite weathering products. As a matter of fact, the mineralogical composition of the alluvium has been inherited from the soils of the region (developed in Jurassic marls), characterized by pedogenetical degradation of illite into open illite, vermiculite, beidellite ánd a large range of interstratified minerals. In marine environment agradation into illite of the alluvial minerals, in which the illite framework was still rather well preserved, probably took place; hence the marine clay shows a lower content of interstratified minerals and a better crystallinity . Finally, an important part of the enormous “bri”-masses must consist of remobilized sediments stored close to the shore on he continental shelf and accumulated there as a detritical product of Jurassic marls during the pleistocene periods with a low sea-level and characterized by strong erosion on the land.Consequently, the origin of the bulk of the marine clay or “bri” in the Poitou coastal plain may be considered as (merely undirectly) continental and local.","AbstractOtherLang":"Met behulp van de X-straal-diffraktietechniek werd de mineralogische samenstelling onderzocht van een welgekozen reeks Holocene zeekleimonsters, afkomstig uit het Marais Poitevin, de grootste van de vier kustvlakten tussen de monding van de Loire en de Garonne. Deze zeeklei of. “bri” bleek hoofdzakelijk te bestaan uit goed gekristalliseerd illiet en kaoliniet, en een belangrijke hoeveelheid beidelliet. Verder kwamen nog wat chloriet, vermiculiet en geïnterstratifieerde mineralen voor.Vergelijkt men deze samenstelling met die van het recent alluvium van de plaatselijke rivieren, dan stelt men een kwalitatieve verwantschap vast, die een verre oorsprong van de zeeklei onwaarschijnlijk maakt. Kwantitatief verschilt het alluvium echter door een geringer illietgehalte en een overwicht van (meestal geïnterstratifieerde) illietafbraakprodukten. De kleimineralen-associatie van het alluvium werd immers overgeërfd van de bodems van de streek (Juramergelverweringsbodems), waarin illiet pedogenetisch wordt omgezet tot open illiet, vermiculiet, beidelliet en een hele gamma interstratifikaties. Vermoedelijk werden de kleimineralen van het alluviaal materiaal, waarin het illietrooster nog tamelijk gaaf bewaard was gebleven, door agradatie in marien milieu weer tot illiet omgezet; vandaar het geringer aantal interstratifikaties en de betere kristallisatiegraad bij de zeeklei.Tenslotte moet een belangrijk deel van de enorme “bri” -hoeveelheden afkomstig zijn van de voor de kust gestockeerde sedimenten, die daar werden afgezet tijdens de afbraak van de Juramergel op het land gedurende de pleistocene erosiefasen met lage zeespiegelstand. De zeeklei of. “bri” zou dus een (hoofdzakelijk onrechtstreekse) kontinentale en lokale oorsprong hebben.","BibLvlCode":"AS","StandardTitle":"Mineralogical composition and origin of marine clays in the Poitou coastal plain (France)","OrigTitleLangCode":"fr","OrigTitleLangCodeExtended":"fre","OrigTitleLangID":22,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":1975,"MonPub":null,"DateUpdate":"2014-11-21","DateCreate":"2004-10-25","SecASFANote":null,"ConfID":null,"PeerRev":0,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":1},"refs":null,"anarec":{"AnaID":67482,"PubliDate":1975,"Pagination":"126-133","XtraPublOfAnaID":null,"ISBN":null,"Volume":"25","Issue":"2","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":67478,"SerRR":"Pedologie: Bulletin van de Belgische Bodemkundige Vereniging = Pédologie: Bulletin de la Société belge de pédologie. 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