Blar i forfatter "Sepp, Holar"

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    • Constraining the conditions of phosphogenesis: Stable isotope and trace element systematics of Recent Namibian phosphatic sediments 

      Lumiste, Kaarel; Mänd, Kaarel; Bailey, Jake; Stüeken, Eva E.; Paiste, Kärt; Lang, Liisa; Sepp, Holar; Lepland, Aivo; Kirsimäe, Kalle (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-03-31)
      Modern phosphogenesis occurs on continental margins influenced by upwelling and high primary productivity. The formation of phosphatic sediments is coupled to global climate fluctuations, biological cycling of phosphorus and local redox conditions. Although the processes involved in phosphogenesis are well described, high-resolution data on the redox and stable isotope systematics in Recent in-situ ...

    • Hydrothermal dedolomitisation of carbonate rocks of the Paleoproterozoic Zaonega Formation, NW Russia — Implications for the preservation of primary C isotope signals 

      Kreitsmann, Timmu; Külaviir, Marian; Lepland, Aivo; Paiste, Kärt; Paiste, Päärn; Prave, Anthony R.; Sepp, Holar; Romashkin, Alexander E; Rychanchik, Dmitry V.; Kirsimäe, Kalle (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-03-03)
      The Paleoproterozoic Zaonega Formation in Karelia, NW Russia, has played a key role in understanding the environmental conditions postdating the Great Oxidation and Lomagundi-Jatuli Events. Its carbonate- and organic-rich rocks (shungite) define the postulated Shunga Event representing an accumulation of very organic-rich sediments at c. 2 Ga and are central in ideas about changing ocean-atmosphere ...