Calcareous Nannoplankton Response to Surface-Water Acidification Around Oceanic Anoxic Event 1a

Erba, Elisabetta; Bottini, Cinzia; Weissert, Helmut; Keller, Christina E.

doi:10.1126/science.1188886

Cited by 213 publications

(250 citation statements)

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“…The presence of pentaliths in the same interval, considered to proliferate in coastal areas with low surface water salinity content 26 , may also reflect input of fresh water under accelerated runoff. The 'nannoconid decline' of the latest Barremian has been interpreted to be related to the emplacement of the Ontong Java Plateau (OJP), responsible for CO 2 emissions, input of biolimiting metals and increased nutrient supply from continental runoff under reinforced greenhouse conditions 4,6,7,10,11,16 . The North Sea record provides evidence for a palaeoclimatic and palaeoecological change compatible with such reconstruction, thus suggesting that the perturbation generated by OJP volcanism probably had an impact also at high latitudes.…”

Section: Discussionmentioning

confidence: 99%

Early Cretaceous chalks from the North Sea giving evidence for global change

Mutterlose

Bottini

2013

Nat Commun

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Among calcareous nannofossils, important primary producers in Jurassic and Cretaceous oceans, nannoconids were carbonate rock-forming organisms. During the late Barremian and early Aptian (B126 to 122 million years ago), nannoconids went through a crisis culminating during the Oceanic Anoxic Event 1a. Here we present nannofossil and geochemical data from a section of early Barremian-early Aptian age from the North Sea, recording the earliest chalks ever known in the Boreal Realm. These middle-late Barremian chalks were generated by blooming of endemic nannoconids under relative warm and arid conditions. A subsequent decrease of nannoconids in the latest Barremian coincides with increased nutrient and clay input. This nannoconid decline, also detected at low latitudes, was associated with the Ontong Java Plateau emplacement. We conclude that nannoconids were rock forming also at high latitudes, under clear and oligotrophic waters. Their decline was related to increased continental runoff under reinforced greenhouse conditions.

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Section: Discussionmentioning

confidence: 99%

Early Cretaceous chalks from the North Sea giving evidence for global change

Mutterlose

Bottini

2013

Nat Commun

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“…It had a global extent (Arthur et al, 1990;Leckie et al, 2002) and a du ration of 1.0 to 1.3 Myr (U et al, 2008). Sediments recording this event have been recognized in the Tethys domain ("SeW level", Menegatti et aI., 1998;Hochuli et aI., 1999;Luciani et aI., 2001;de Gea et al, 2003;Erba and Tremolada, 2004;Heimhofer et al, 2004;Aguado et aI., 2008;de Gea et aI., 2008b;Najarro and Rosales, 2008b;Rosales et al, 2009;Mehay et al, 2009;MilLin et al, 2009;Najarro et al, 2011 a, b;Stein et al, 2011, among others), in the Boreal domain (Grocke et al, 1999;Follmi et al, 2006), in the Pacific Uenkyns, 1995; Ando et aI., 2002;Price, 2003;Dumitrescu and Brassell, 2005), and Mexico (Bralower et al, 1999). Dramatic environ mental changes occurred in association with OAEl a in settings rang ing from continental to pelagic, and particularly in shallow marine carbonate platforms.…”

Section: Introductionmentioning

confidence: 99%

“…Dramatic environ mental changes occurred in association with OAEl a in settings rang ing from continental to pelagic, and particularly in shallow marine carbonate platforms. Among the most striking time-related phenom ena were the "nannoconid crisis" (Erba, 1994;Aguado et al, 1999;Erba et al, 2010), profound changes in the marine biota (e.g. Bralower et aI., 1994;Erbacher et aL, 2001;Leckie et aI., 2(02), and drastic per turbations in land vegetation and in continental weathering (Follmi et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Among the most striking time-related phenom ena were the "nannoconid crisis" (Erba, 1994;Aguado et al, 1999;Erba et al, 2010), profound changes in the marine biota (e.g. Bralower et aI., 1994;Erbacher et aL, 2001;Leckie et aI., 2(02), and drastic per turbations in land vegetation and in continental weathering (Follmi et al, 2006). Nevertheless, other studies suggest that major pCOz and vegetation changes did not occur during OAEla (Heimhofer et al,2 004).…”

Section: Introductionmentioning

confidence: 99%

“…to changes in ocean productivity (Menegatti et al, 1998;Larson and Erba, 1999;Erba and Tremolada, 2004;Weissert and Erba, 2004). This paper presents the study of four sections recording the OAEl a in Spain, from two different basins (Southern Iberian Palaeomargin and North Cantabrian Basin, Fig.…”

Section: Introductionmentioning

confidence: 99%

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Organic geochemistry, stable isotopes, and facies analysis of the Early Aptian OAE—New records from Spain (Western Tethys)

Quijano

Jiménez

Pancost

et al. 2012

Palaeogeography, Palaeoclimatology, Palaeoecology

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The Early Aptian Oceanic Anoxic Event (OAEla) is a time interval characterized by increased organic carbon accumulation in marine sediments, notable sedimentary and biotic changes, and abrupt carbon-isotope excursions indicative of significant major palaeoenvironmental changes linked to a perturbation in the global carbon cycle. Here we present the study of four sections recording the OAEl a (Early Aptian) in Spain, which are located in two broad basins respectively located in the South and the North of Iberia: the Southern Iberian Palaeomargin (Carbonero, La Frontera and Cau sections) and the Basque-Cantabrian Basin (Puentenansa section), which represent depositional settings ranging from shallow marine (distal ramp -Cau-and drowned platform -Puentenansa-) to pelagic environments (Carbonero, La Frontera). Biomarker compositions, C-isotope profiles, biostratigraphic data and fades analysis from the four sections are correlated and integrat ed. The C-isotope curves all present a clear negative excursion followed by a positive shift. The integration of the C-isotope curves with the biostratigraphic data has been used to correlate the studied sections and to ten tatively identify the eight segments formerly proposed from the Alpine domain, and subsequently identified in sections worldwide. Four main groups of compounds are present in all sections: n-alkanes, isoprenoids, hopanes and steranes. n-Alkanes and acyclic isoprenoids (pristane and phytane) are dominant in most samples.The hopanes are represented by a range ofC27 to C35 components, with the specific isomers varying amongst the sections due to differences in thermal maturity. Steranes ocrur as a range of C27, C28 and C29 isomers, whereas diasteranes only occur in the most thermally mature section (Carbonero). Other compounds of interest include gammacerane and dinosterane. Differences in thennal maturity appear to be the first order control on different biomarker assemblages amongst the studied sections. The Carbonero section is thermally mature, whereas the nearby La Frontera and Cau sections are immature. Puentenansa has intermediate values. Organic matter is de rived from a range of terrestrial, marine and bacterial sources. The dominance of the C29 sterane isomers in all sections suggests a strong contribution from higher plants. The presence of gammacerane indicates water col umn stratification, and high C2g/C30 hopane ratios suggest anoxia at the water/sediment interface, respectively.Sedimentologic analysis also suggests anoxic conditions during sedimentation, but evidence for strong and per sistent water column anoxia is equivocaL The correlation of the sections reveals that sedimentation of organic-rich fades started earlier in pelagic and later in the shallow marine settings, which can be related to an expansion of the favorable conditions for organic matter accumulation and preservation from deep marine waters to shallower platform environments during the development ofOAEla.

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The Osmium Isotope Signature of Phanerozoic Large Igneous Provinces

Dickson

Cohen

Davies

2021

Large Igneous Provinces

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The emplacement of Large Igneous Provinces (LIPs) throughout the Phanerozoic Eon introduced vast quantities of mafic rocks to the Earth's surface, which were subsequently weathered into the oceans. Osmium isotope data can be used to track these LIP-related weathering fluxes, providing a global fingerprint of the timing and magnitude of LIP emplacement, and guiding assessments of the impact of these events on ocean biogeochemistry and the regulation of the global climate system. Sedimentary Os isotope records spanning late Phanerozoic LIP events are reviewed herein and new observations from Eocene hyperthermal event ETM-2 are presented. While Os isotope stratigraphy can pro vide major constraints on LIP activity in the geological record, it cannot always distinguish whether the extrusive activity was subaerial or submarine. The utility of osmium isotopes as a global tracer of past volcanism may be enhanced when used alongside proxies such as mercury concentrations, which may be more diagnostic of the style of individual episodes of LIP emplacement. Hitherto, only a few high-resolution Os-isotope records across Phanerozoic LIPs have effectively exploited the short oceanic residence time of Os. Future high-resolution studies across suitable, well-preserved stratigraphic records will significantly improve our understanding of the nature, progression, and consequences of LIP emplacement.

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Calcareous Nannoplankton Response to Surface-Water Acidification Around Oceanic Anoxic Event 1a

Cited by 213 publications

References 29 publications

Early Cretaceous chalks from the North Sea giving evidence for global change

Early Cretaceous chalks from the North Sea giving evidence for global change

Organic geochemistry, stable isotopes, and facies analysis of the Early Aptian OAE—New records from Spain (Western Tethys)

The Osmium Isotope Signature of Phanerozoic Large Igneous Provinces

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