Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . ; Robson & Dingle(1986); Rogers (1977, 1986); Shannon (1985); Summerhayes et al. (1979); Tucholke & Carpenter(1977); Tucholke & Embley (1984); Westall (1984). SOUTHERN AFRICAN DEEP-SEA SEDIMENTARY ENVIRONMENTS 3 et al. (in press). There are strong contrasts in the nature and style of sedimentsbetween the south-east Atlantic and south-west Indian oceans, which resultprimarily from a combination of two phenomena: climate (terrestrial andoceanographic), and ocean basin physiography. Climate dictates the quantity andrelat
Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . ; Robson & Dingle(1986); Rogers (1977, 1986); Shannon (1985); Summerhayes et al. (1979); Tucholke & Carpenter(1977); Tucholke & Embley (1984); Westall (1984). SOUTHERN AFRICAN DEEP-SEA SEDIMENTARY ENVIRONMENTS 3 et al. (in press). There are strong contrasts in the nature and style of sedimentsbetween the south-east Atlantic and south-west Indian oceans, which resultprimarily from a combination of two phenomena: climate (terrestrial andoceanographic), and ocean basin physiography. Climate dictates the quantity andrelative proportions of terrigenous, biogenic, and authigenic material potentiallyavailable for injection into the deep basins, and is controlled by the two quasi-resident high-pressure atmospheric circulation cells (anticyclones) that lie oneither side of southern Africa. One over the south-west Indian Ocean and thesouth-eastern seaboard of Africa supports a high-energy, relatively low-productivity western boundary surface current (Agulhas Current) adjacent to the. upwellingcells 4 kmAABW — —. m NADW — Benguela Current Agulhas Current • —» Angola Current Fig. 2. Oceanographic setting of southern Africa. Water-mass flow paths are schematic, andbased on numerous authors cited in the text. Coastal upwelling sites are after Shannon (1985).Abbreviations: rivers—KR = Kunene, LR = Limpopo, OR = Orange, TR = Tugela, ZR —Zambezi; physiographic features—AB = Agulhas Basin, ABK = Agulhas Bank, AP = AgulhasPlateau, AR = Agulhas Ridge, CB = Cape Basin, MB = Mozambique Basin, MR =Mozambique Ridge, NV = Natal Valley, TB = Transkei Basin, WR = Walvis Ridge. 4 ANNALS OF THE SOUTH AFRICAN MUSEUM humid hinterland of south-east Africa, while the other over the south-eastAtlantic is associated with a low-velocity, high-productivity eastern boundarysurface current (Benguela Current) adjacent to the arid hinterland of south-westAfrica (Fig. 2). The former sustains shelf sedimentary envir
Size: 1681px × 1487px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
