New PDF release: Oceanic Sedimentation: Lithology and Geochemistry

By Alexander P. Lisitzin

Translation of: Protsessy okeanskoi sedimentatsii. Russian variation released via Nauka, Moscow, 1978.

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Additional resources for Oceanic Sedimentation: Lithology and Geochemistry

Example text

It hasbeennotedthattheprincipalfeatureof connectionwith industrialization,grown from 290 ppmv in 1890 to 315 ppmvat present,that is, by 10% [Flawn, 1970]. By now, the amountof carbondioxideproducedby industry is roughly10 timesgreaterthanthat releasedduringrespiration by all animalsof the Earth. Affectedby the cultivationof land and the construction of roadsand cities,the intensityof naturalerosionincreases, accordingto the estimatesof Judson[1968], by 2-3 Thecontent •f carbondioxidegasin theatmosphere has,in 46 OCEANIC SEDIMENTATION Table6.

The relativecontentof sand-silt o materialin the runoffof temperate zonesis 3 timeshigher thanthatof clay,whereas in therunoffof theequatorial zone, thesituation is quitetheopposite: thereare4 timesmoreclay o than coarser material. However, in examiningthe absolute • massratherthanthe percentage indicators of sandand silt material,it canclearlybe seenthatthe amountdeliveredby theequatorial zoneis several timeshigherthanthatcontribut- 'o o N •- '0 •-00 o o o N E • a X ed by two temperatehumidzones.

In accordance with thetypeof weathering crust. The process of weathering andthe formationof secondaryalsochanges is slow(theUkrainiantype),bases makeup mineralsare accompanied by the leachingof manyelements, Wheretheprocess whichare furtherevacuated in solutionor are redeposited in 57% of evacuatedelements,silicamakesup 35%, andA1 and the sameplace(neogenesis). ,//to S /-1 /2-3/? 40 •to60 i• 100% I I Figure 4. Characteristics of theweathering of basicrocksin various Climatic zones. FromLisitsyna[1975].

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Oceanic Sedimentation: Lithology and Geochemistry by Alexander P. Lisitzin

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