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lower Aptian
STRATIGRAPHIC DRILLING IN THE NORTHEASTERN LAPTEV SEA: MAIN RESULTS AND FURTHER DEVELOPMENT
Pulsed volcanism and rapid oceanic deoxygenation during Oceanic Anoxic Event 1a
Magnetostratigraphy of U-Pb–dated boreholes in Svalbard, Norway, implies that magnetochron M0r (a proposed Barremian-Aptian boundary marker) begins at 121.2 ± 0.4 Ma
A Model of the Geological Structure and the Oil and Gas Prospects of Neocomian (Berriasian–Lower Aptian) Sediments of the West Siberia Arctic Regions and the Kara Sea Shelf
Synrift evaporite deposition and structural characterization of the onshore Alagoas subbasin
Historical and Geological Modeling of the Processes of Hydrocarbon Generation in the Hettangian–Aalenian Deposits of the Ust’-Tym Megadepression
Problems of selection and correlation of stratotype sections of the Neocomian in West Siberia in the context of clinoform structure
Barremian platform carbonates from the eastern Vercors Massif, France: Organization of depositional geometries
Mercury enrichments in lower Aptian sediments support the link between Ontong Java large igneous province activity and oceanic anoxic episode 1a
The palynostratigraphy of the Upper Maiolica, Selli Level and the Lower Marne a Fucoidi units in the proposed Barremian/Aptian (Lower Cretaceous) GSSP stratotype at Gorgo a Cerbara, Umbria–Marche Basin, Italy
Intersite discrepancy in the amplitude of marine negative δ 13 C excursion at the onset of early Aptian oceanic anoxic event 1a: Reconciliation through Sr isotopic screening of peculiar diagenetic overprint on the Pacific reference section (Deep Sea Drilling Project Site 463)
Among various paleoenvironmental proxy records across the lower Aptian Selli Level (Umbria-Marche basin, Italy) and its equivalents (i.e., sedimentary expressions of oceanic anoxic event [OAE] 1a), one very intriguing feature is a prominent negative δ 13 C excursion at the base of this sedimentary unit, generally by as much as a few per mil in marine carbonates. This early Aptian δ 13 C event has received special attention as an important clue to the genesis of OAE 1a, but the exact amplitude of this relatively short lived δ 13 C variation is not precisely constrained, and this fact has been an obstacle in paleoenvironmental modeling. Particularly enigmatic is the large amplitude, by −7‰, in pelagic limestones at the central Pacific Deep Sea Drilling Project (DSDP) Site 463; it may be a primary δ 13 C signal, considering its deposition in a fully open-ocean setting and a conservative burial diagenetic environment. Nevertheless, new Sr isotope data help identify a peculiar diagenetic overprint on the lower Aptian interval of this site. While the majority of examined samples represent slightly shifted, but acceptable, 87 Sr/ 86 Sr ratios for marine carbonates of this age, markedly unradiogenic 87 Sr/ 86 Sr ratios are recorded within and just below the Selli Level–equivalent interval. In particular, extremely unradiogenic 87 Sr/ 86 Sr ratios (0.70623–0.70642) are detected at exactly the same interval as the most negative δ 13 C values and a smectite-rich lithology. It is therefore proposed that hitherto unknown diagenetic process, or processes, under peculiar interstitial-water geochemistry, resulting from volcanic ash alteration, played a role for the paired δ 13 C- 87 Sr/ 86 Sr anomaly at DSDP Site 463. By removing the δ 13 C data from samples that possess the highly unradiogenic 87 Sr/ 86 Sr ratios, the amplitude of early Aptian negative δ 13 C excursion is reevaluated to be −2.7‰ or −3.3‰, facilitating comparison with published δ 13 C records from other sections. The refined Site 463 δ 13 C profile further implies that the early Aptian negative δ 13 C event is better described as a twin excursion.