Geochemical and mineralogical records of late Albian oceanic anoxic event 1d (OAE-1d) in the La Grita Member (southwestern Venezuela): Implications for weathering and provenance

Major and trace element characterization of Oceanic Anoxic Event 1d (OAE 1d): Insight from the Umbria-Marche Basin, central Italy

“…In fact, the OAE 1d carbon isotope anomaly has been identified worldwide in variable depositional settings, thus suggesting a potential global extent of this event. In particular, it has been widely recognized in the western Tethys Ocean (Erbacher and Thurow, 1997;Gale et al, 1996;Stoll and Schrag, 2000;Strasser et al, 2001;Bornemann et al, 2005;Reichelt, 2005;Sprovieri et al, 2013;Gambacorta et al, 2015;Giorgioni et al, 2015;Bąk et al, 2016;Gyawali et al, 2017), in the eastern Tethys Ocean (Vahrenkamp, 2013;Zhang et al, 2016;Wohlwend et al, 2016;Hennhoefer et al, 2018;Yao et al, 2018;Navidtalab et al, 2019), in the northern Tethys (Melinte-Dobrinescu et al, 2015), in the Atlantic Ocean (Wilson and Norris, 2001;Nederbragt et al, 2001;Petrizzo et al, 2008;Ando et al, 2010), in the Pacific Ocean (Takashima et al, 2004;Robinson et al, 2008;Navarro-Ramirez et al, 2015;Rodriguez-Cuicas et al, 2019, 2020, in the Western Interior Seaway (North America) (Gröcke et al, 2006;Gröcke and Joeckel, 2008;Scott et al, 2013;Richey et al, 2018), in the Boreal Realm (Mitchell et al, 1996;Bornemann et al, 2017), and in the Indian Ocean (Madhavaraju et al, 2015).…”

First Record of Oceanic Anoxic Event 1d at Southern High Latitudes: Sedimentary and Geochemical Evidence From International Ocean Discovery Program Expedition 369

“…During OAE 1d and other Cretaceous OAEs, greenhouse climate initiated by volcanic eruptions might have accelerated the hydrological cycle on land and resulted in higher terrigenous supply to the ocean (Jenkyns, 2010; Richey et al., 2018; Rodríguez‐Cuicas et al., 2020). This model explains well the stratigraphic trends in terrigenous detritus input proxies (i.e., MAR siliciclastic , Ti/Ca biologic ratio, and median grain size) at Site U1513 during OAE 1d (Figure 2), indicating a considerable enhancement in continental runoff and terrigenous supply from a southwestern Australia provenance.…”

“…Previous studies have shown that OAE 1d is characterized by a positive carbon isotope excursion (∼0.5–1.5‰) in carbonate and organic carbon, elevated contents of total organic carbon content (TOC, ∼1%–2%), and increased turnover rates in planktic foraminifera and radiolaria (Erbacher & Thurow, 1997; Richey et al., 2018; Wilson & Norris, 2001; Yao et al., 2018). This event was also accompanied by an accelerated hydrological cycle, intensified continental chemical weathering and terrigenous supply, increased nutrient discharge to the ocean, and enhanced upwelling and primary productivity in the sea (Charbonnier et al., 2018; Jenkyns, 2010; Rodríguez‐Cuicas et al., 2020). Regarding the forcing mechanisms of OAE 1d, the eruption of the Central Kerguelen large igneous province may have driven the onset of this anoxic event (Yao et al., 2021).…”

“…Unfortunately, there is no consensus on specific events and/or processes that forced OAE 1d. Spatially, OAE 1d has been well documented in the Tethys (Bornemann et al, 2005;Erbacher & Thurow, 1997;Pavlishina, 2017;Yao et al, 2018), in the Boreal realm (Bornemann et al, 2017) and in the Atlantic Ocean (Giorgioni et al, 2015;Rodríguez-Cuicas et al, 2020;Wilson & Norris, 2001). It has also been identified in North America (Gröcke et al, 2006;Richey et al, 2018;Scott et al, 2013) and the subequatorial Pacific (Navarro-Ramirez et al, 2015).…”