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Sedimentary fluxes and different dispersion mechanisms of the clay sediments in the Adriatic Basin

Content Provider	Springer Nature Link
Author	Tomadin, Lucia
Copyright Year	2000
Abstract	Investigating the composition and the distribution of the muds deposited in the Adriatic, a typical shelf basin, numerous evidences of the variable provenance and dispersal of the clay sediments have been observed. The clay minerals behave, in fact, as excellent natural tracers. The distribution maps of illite and smectite (the most abundant components of the Adriatic clays) and of their crystallinity indices, show a prevailing longitudinal dispersion of the clay sediments, which is connected with the general cyclonic circulation of the marine currents. Two main fluxes toward SE have been recognised in the bottom sediments along the Italian peninsula: one «Apennine flux» close to the western coasts and one parallel «Padane flux» in the open sea. On the contrary, one subordinate «Albanian flux» conveys clay sediments toward NW along the eastern coasts of the basin. Also other transport mechanisms play an important role in the different areas of the Adriatic. In the shallow northern Adriatic, the clay sedimentation is controlled by a superficial dispersion of the fine suspended load carried by the large plume of the Po River. By increasing depth of the waters, gradient currents of variable provenance favour the longitudinal flows of the clay sediments. In the deepest Southern Adriatic, besides the NS-oriented fluxes, turbidity currents flow transversely to the basin and carry clay sediments from the Apulian shelf and from the Albanian-Montenegrin shelf into the bathyal basin.La composizione e la distribuzione dei fanghi di un tipico bacino di piattaforma come l’Adriatico hanno fornito molteplici indicazioni sulla provenienza e la dispersione dei sedimenti argillosi. I minerali argillosi che li compongono, si comportano infatti da eccellenti traccianti naturali. Mappe di distribuzione di illite e smectite (i più abbondanti minerali presenti nei sedimenti argillosi adriatici) e dei loro indici di cristallinità, mettono in evidenza la prevalente dispersione longitudinale dei materiali fini nel bacino. Essa dipende dalla circolazione ciclonica delle correnti marine nell’Adriatico, che favorisce lo sviluppo di importanti flussi sedimentari. Lungo le coste italiane, due flussi principali caratterizzano il trasporto di materiali argillosi verso SE: un «flusso Appenninico» costiero ed un «flusso Padano» di mare aperto parallelo al primo. Un «flusso Albanese» subordinato si muove invece verso NO e convoglia sedimenti fini lungo le coste orientali del bacino. Anche altri meccanismi di trasporto giocano un ruolo importante nella dispersione dei sedimenti argillosi nell’ambiente marino. Essi si affiancano, in genere, all’azione dominante di trasporto legata alla circolazione generale delle acque. Nell’Adriatico settentrionale, la diffusione del grande pennacchio torbido del Po influisce notevolmente sulla distribuzione dei sedimenti. Al crescere della profondità delle acque, correnti di gradiente di varia origine agiscono frequentemente in varie parti del bacino, contribuendo al movimento dei materiali in sospensione e favorendo flussi longitudinali di sedimenti argillosi. Nell’Adriatico meridionale, oltre all’azione dei flussi principali, correnti torbide trasversali al bacino trasportano materiali argillosi dalla piattaforma pugliese e da quella albanese-montenegrina verso il bacino batiale.
Starting Page	161
Ending Page	174
Page Count	14
File Format	PDF
ISSN	11206349
Journal	Rendiconti Lincei
Volume Number	11
Issue Number	3
e-ISSN	17200776
Language	Lithuanian
Publisher	Springer-Verlag
Publisher Date	2000-01-01
Publisher Place	Milan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Adriatic Sea Clay sediments Clay minerals Tracers Sedimentary fluxes Environment Geosciences Life Sciences Biomedicine general History of Science
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Environmental Science Agricultural and Biological Sciences

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