988 resultados para 530


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CHN analyses of sediments and rocks sampled during DSDP Leg 75 in the South Atlantic have provided concentrations of organic carbon and atomic C/N ratios of organic matter from two sites. High values of organic carbon were measured in sediments deposited during Neogene and Cretaceous times at Site 530 in the Angola Basin; sediments deposited at other times contain less than 0.5% organic carbon. Development of the Benguela Current and associated upwelling-supported biological productivity is recorded in late Miocene to Holocene sediments which contain 1 to 7% organic carbon. These sediments include debris flows and turbidites composed of predominantly biogenic materials originally deposited on the Walvis Ridge and on the African continental margin. Organic-carbon-rich black shales containing up to 17% organic carbon occur in late Albian to Coniacian turbidite sequences. These Cretaceous black shale layers are commonly several centimeters thick and are separated by bioturbated fine-grained organic-carbon-poor turbidites which are usually much thicker. At Site 532 on the Walvis Ridge, biogenic sediments deposited between late Miocene and Holocene times contain 1 to 9% organic carbon. Fluctuations in the intensity of high biological productivity associated with the Benguela Current are preserved in alternating light and dark layers of sediments. C/N ratios of organic matter in sediments from both sites are typical of marine sources

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Description based on: 99-002; title from cover.

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Description based on: 84-005; title from cover.

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80 Briefe zwischen Julian und Lotte Gumperz und Max Horkheimer, 1934 - 1942; 1 Brief von Max Horkheimer an Jerome D. Green, 05.09.1935; 1 Brief an die Rockefeller Foundation (Paris) von Julian Gumperz, 01.09.1935; 1 Brief von Julian Gumperz an Arthur Surveyer, 24.05.1935; 3 Briefe von der William M. Mortimer Company (New York) and Max Horkheimer, 1934; 4 Briefe von Julian Gumperz an die William M. Mortimer Company (New York), 1934; 2 Briefe zwischen Robert S. Lynd und Julian Gumperz, Juli 1934; 2 Briefe zwischen Julian Gumperz und Frederick Pollock, 1934; 1 Brief an Birchman & Molloy von Julian Gumperz, 16.05.1934; 1 Brief von Julian Gumperz an A. Flexner, 14.05.1934; 1 Brief an die United States Lines (New York) von Julian Gumperz, 10.05.1934; 24 Briefe zwischen Julian Gumperz und Taylor Mitchell (Capron & Marsh, New York), 1934 - 1935; 1 Brief von The Brookings Institution (Washington D.C.) an Julian Gumperz, 11.07.1934;