Paleoenvironmental reconstruction of a Neoarchean oxygen oasis

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dc.contributor.advisor Schönberg, Ronny (Prof. Dr.) Eroğlu, Sümeyya 2018-01-16T09:08:39Z 2018-01-16T09:08:39Z 2018-01-16
dc.identifier.other 497197987 de_DE
dc.identifier.uri de_DE
dc.description.abstract The Neoarchean-Paleoproterozoic Transvaal Supergroup in South Africa contains the Campbellrand-Malmani carbonate platform (CMCP), which was deposited in shallow seawater between ~2.58 to 2.50 billion years ago, about 200 million years before the rise of atmospheric oxygen (Great Oxidation Event - GOE). The platform is a prominent candidate for (isotope-) geochemical mapping to investigate the appearance of very small amounts of free oxygen that accumulated in shallow seawater preceding the GOE. Thus, the CMCP might represent an Archean ‘oxygen oasis’ in an otherwise anoxic environment. Carbon, molybdenum, and iron isotope compositions of CMCP sediments support the presence of molecular oxygen in the shallow-marine system and emphasize the utility of Ca-Mg carbonates as proxies for trace metal systematics in the aqueous environment. However, this study also shows that special environmental and depositional conditions were necessary to induce this development, in particular the formation of the rimmed margin and the restriction of the platform interior from the open ocean. In this restricted environment, oxygen production by aerobe photosynthesis could have increased relative to oxygen consumption by reducing species and induced an increasing oxidation of the shallow-marine environment over time. en
dc.language.iso en de_DE
dc.publisher Universität Tübingen de_DE
dc.rights ubt-podno de_DE
dc.rights.uri de_DE
dc.rights.uri en
dc.subject.classification Isotopengeochemie , Carbonate , Carbonatplattform de_DE
dc.subject.ddc 550 de_DE
dc.title Paleoenvironmental reconstruction of a Neoarchean oxygen oasis en
dc.type Dissertation de_DE
dcterms.dateAccepted 2016-10-27
utue.publikation.fachbereich Geographie, Geoökologie, Geowissenschaft de_DE
utue.publikation.fakultaet 7 Mathematisch-Naturwissenschaftliche Fakultät de_DE


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