Volcanism, CO ₂ and palaeoclimate: a Late Jurassic–Early Cretaceous carbon and oxygen isotope record

Demise of the northern Tethyan Urgonian carbonate platform and subsequent transition towards pelagic conditions: The sedimentary record of the Col de la Plaine Morte area, central Switzerland

“…13). Unlike Weissert and Erba (2004) and Gradstein et al (2004), who dated the positive shift in the δ 13 C record and OAE 1a as equivalent to the weissi zone, we place OAE 1a within the deshayesi zone, thereby using the ammonite-calibrated evolution of the δ 13 C record in the area of Cassis-La Bédoule cf. also Föllmi et al, 2006) and the age of the "niveau Goguel", which is dated as deshayesi zone (e.g., Bréhéret, 1997).…”

“…Multiple links have been proposed between chemical and environmental change on the continents, the shelf regions and deeper basins during these episodes, such as increased methane release from slope sediments (Wissler et al, 2003), ocean acidification (Weissert and Erba, 2004) and increased nutrient input from continents (Erba, 1994;Föllmi et al, 1994). These interpretations are all dependent on positive correlations between the numerous proxies of environmental change in the different compartments.…”

Composition and timing of carbonate vein precipitation within the igneous basement of the Early Cretaceous Shatsky Rise, NW Pacific

“…Occasionally occurring excursions of the marine  13 C values to higher or lower levels are therefore of great palaeoceanographic interest and can be also used for Weissert Event, which is linked to the first global Oceanic Anoxic Event (e.g., Weissert et al, 1998;Weissert and Erba, 2004). Taken together, the C isotope values of the Shatsky vein calcite cannot unambiguously constrain the age of calcite precipitation but are consistent with an Early Cretaceous formation and with the proposed age relationship of the drill sites.…”

Integrated biostratigraphy and carbon isotope stratigraphy of the Upper Jurassic shallow water carbonates of the High-Tatric Unit (Mały Giewont area, Western Tatra Mountains, Poland)

“…The de creas ing trend of d 13 C within the KimmeridgianTithonian is a well-known phe nom e non (e.g., Cecca et al, 2001;Padden et al, 2002;Weissert and Erba, 2004;Jach et al, 2014;Arabas, 2016;Price et al, 2016). The over all sim i larity of the d 13 C de creas ing val ues re corded in the Kimmeridgian-low er most Tithonian in ter val of the Ma³y Giewont area (this study) and the D³uga Val ley sec tions indi cates that the gen er ally shal low-wa ter lime stones of the RTL Fm ac cu mu lated be low the zone in flu enced by changes in the com po si tion of ma rine wa ter caused, for in stance, by in tense rain fall.…”