By Alexander P. Lisitzin
Translation of: Protsessy okeanskoi sedimentatsii. Russian variation released by means of Nauka, Moscow, 1978.
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Additional resources for Oceanic Sedimentation: Lithology and Geochemistry
Iron). Currentsdecrease sharplywhenriver watersenterthe ocean,andsuspended materialsettlesrapidly. 2 mg/l), a reductionof 2500-5000 times;(2) comparison of sedimentation ratesat river mouths(estuariesanddeltas) CHAPTER2: THE FORMATIONOF SEDIMENTARYMATERIAL ON LAND 37 Table 3F. We accept the last value. 3% is retained adjacentto the river mouthsand the adjoiningareasof shelf. This shows how incorrect the first calculations were of the resi- dencetime for the elementsof terrigenousdischarge,as well as conceptsof the dominationof river material in oceanic thoseof pelagicsediments (in gramspersquarecentimeterper sedimentation.
Diagram of oceanic surface currents (northern hemisphere winter):1, warm;2, cold;3, extratropical monsoon regions; 4, tropical monsoon regions. C. :.. (• •,,,:.... :. • ... : & •r ".. '½. :••• M: -•••. •• • I ",,,,• • . , • ....... ,.... • N / • • ...... '•:•; •' .... • • ttlltltltttttt t __ •.. " ....... _. • . ::': :. •::. • ß. •. : •.... :•• lines, surface waters; broken lines, interstitial waters; dotted lines, benthic waters [Venkatarathnam et aL, 1972]. D. , 1963]. The chromium 31 content is in standard units: in surface layer: 1, <25; 2, 25-50; 3, 50-100; 4, > 100; figures, actual values.
The data citedin Tables5 and6 indicatenot only thatthe quantityand sizeof the sedimentary materialdeliveredto the oceanfrom differentclimaticzonesare subjectto changebut also that mineralcomposition andmineralcomplexes (paragenesis) of clasticanddispersed mineralsare subjectto CHAPTER 2' THE FORMATION OF SEDIMENTARY MATERIAL ON LAND 45 Table 5. 1 Total Only the mobile portion is taken into account; hence, the material carried from desert regions is composed of 40% silt and 60% clay; larger fractions remain in the desert regions (without regard for losses of river sediments discharged at the river-ocean boundary).