Sediment chemistry and magnetic properties in an anomalously reducing core from the eastern Mediterranean Sea

Passier, Hilde F.; Dekkers, Mark J.; Lange, Gert J. de

doi:10.1016/s0009-2541(98)00121-1

Cited by 40 publications

(26 citation statements)

References 58 publications

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“…The (ghost) sapropels formed at 20-kyr insolation maxima, but generally not during low eccentricity periods (e.g. Langereis et al, 1997;Kroon et al, 1998;Passier et al, 1998). The oxygen isotope stages corresponding to these low 100-kyr eccentricity maxima (OIS 19 and 11) are clearly recognisable, and neither suppressed nor less well developed in the available 18 O records from these cores Kroon et al, 1998).…”

Section: Lignite-dominated Lacustrine Basinsmentioning

confidence: 98%

Orbital forcing in Pliocene–Pleistocene Mediterranean lacustrine deposits: dominant expression of eccentricity versus precession

Vugt

Langereis

Hilgen

2001

Palaeogeography, Palaeoclimatology, Palaeoecology

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Milankovitch forcing of climate is expressed in the sedimentary record as lithological cycles that can have one or more of four typical periods related to precession (21 kyr), obliquity (41 kyr) and eccentricity (100 and 400 kyr). In several Mediterranean continental successions, striking differences in the expression of particularly precession and eccentricity appear. We present the results of an additional lower Pliocene lacustrine succession from Lupoaia (southern Romania), and compare the cyclic expression in this lignite±siliciclastic basin in detail with the time-equivalent lignite±carbonate basin of Ptolemais (northern Greece), the middle Pleistocene lignite±siliciclastic basin of Megalopolis (southern Greece) and the Miocene carbonate±clay basin of Orera (north eastern Spain). It appears that carbonate basins dominantly express precession, while siliciclastic basins dominantly express eccentricity in their lithological cycles. This can be explained by a more linear response to insolation forcing in carbonate basins than in siliciclastic basins. Alternatively, it can be explained by the low amplitude of 100-kyr eccentricity at the times the carbonate sections were deposited. This reduced 100-kyr amplitude was caused by minima in the 2.35 Myr eccentricity cycle, that co-occurred with the deposition in both carbonate basins. Finally, the expression of 100-kyr eccentricity appears to be independent of glacial cyclicity. q

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Section: Lignite-dominated Lacustrine Basinsmentioning

confidence: 98%

Orbital forcing in Pliocene–Pleistocene Mediterranean lacustrine deposits: dominant expression of eccentricity versus precession

Vugt

Langereis

Hilgen

2001

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…Nguyen and Harvey, 1998;Hsu and Hatcher, 2006). However, it is logical to assume that a significant amount of the organic nitrogen arrives from the reaction of ammonia and OM considering the relatively high concentrations and reactivity of ammonia in anaerobic marine sediments (Bregant et al, 1990;Schulz et al, 1994;Passier et al, 1998;Cotner et al, 2004;Knicker, 2004). Moreover, the ability of ammonia to form cross-linked bonds with OM, as demonstrated in the present study, could indicate another important route for the accumulation and preservation of organic nitrogen.…”

Section: Enhancement In the Polymerization Rate In Depositional Envirmentioning

confidence: 53%

“…doi:10. /j.gca.2007 coexist in the environment (Aizenshtat et al, 1983;Bregant et al, 1990;Schulz et al, 1994;Passier et al, 1998;Cotner et al, 2004) and compete for the same electrophiles during the formation of geo-macromolecules. Polysulfide anions are the most active reduced sulfur species and are suggested to be the most important species in diagenetic sulfur incorporation into organic matter (Aizenshtat et al, 1983;Francois, 1987;Lalonde et al, 1987;Mossmann et al, 1991;Vairavamurthy et al, 1992;Krein, 1993;Loch et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Formation of sulfur and nitrogen cross-linked macromolecules under aqueous conditions

Amrani

Turner

et al. 2007

Geochimica et Cosmochimica Acta

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“…Destabilization of gas hydrates during earth's colder intervals (normally coincident with sea level falls) is an important mechanism at the carbon cycle (Kennedy et al 2001). Recent studies have indicated that oxidation of sapropel materials promote enrichment of Ba in overlying sediments (van Santvoort et al 1996(van Santvoort et al , 1997Passier et al 1998;Dickens 2001a). Kennedy et al (2001) and Dickens (2001b, c) suggested that destabilization of gas hydrates and release of methane gas into the atmosphere might have been a widespread phenomenon during earth's history and could be traced by negative excursions of d 13 C in sedimentary records.…”

Section: Discussionmentioning

confidence: 99%

Barium anomaly preceding K/T boundary: possible causes and implications on end Cretaceous events of K/T sections in Cauvery basin (India), Israel, NE-Mexico and Guatemala

Ramkumar

Harting

Stüben

2005

Int J Earth Sci (Geol Rundsch)

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Maastrichtian-Danian strata of the Cauvery basin as well as selected sections of NE-Mexico, Guatemala and Israel record Ba anomalies, away from the Cretaceous/Tertiary boundary (KTB) in addition to common occurrences of geochemical and stable isotopic anomalies across the KTB. Ba anomalies were recorded in monotonous shallow marine sandstones of the Cauvery basin (south India) which contain minor amounts of Ba-orthoclase. Barium anomalies were observed also in shallow marine carbonates in sections of Israel, NEMexico and Guatemala. Calculation of excess Ba with reference to PAAS (Post-Archaen Average Australian Shale), comparison of coeval geochemical anomalies, depositional pattern and associated petrographic and mineralogical features of the Cauvery basin revealed that while a first Ba peak was related to detrital influx, the second Ba peak was coincident with sea level fall which in turn may have been influenced by emission of volatile hydrocarbons and resultant climatic changes. In view of intrinsic involvement of Ba in various geochemical processes and occurrence of Ba anomalies in K/T sites distributed around the world (NE-Mexico, Guatemala and Israel), it is suggested that probable causes of such widespread Ba-anomalies should be taken into consideration while analyzing end Cretaceous events. These observations support the views espoused by many workers who have stated that the K/T boundary was also accompanied by many non-catastrophic events that might have contributed to environmental stress on marine fauna, as a result of which selective multi-stage extinctions occurred.

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Sediment chemistry and magnetic properties in an anomalously reducing core from the eastern Mediterranean Sea

Cited by 40 publications

References 58 publications

Orbital forcing in Pliocene–Pleistocene Mediterranean lacustrine deposits: dominant expression of eccentricity versus precession

Orbital forcing in Pliocene–Pleistocene Mediterranean lacustrine deposits: dominant expression of eccentricity versus precession

Formation of sulfur and nitrogen cross-linked macromolecules under aqueous conditions

Barium anomaly preceding K/T boundary: possible causes and implications on end Cretaceous events of K/T sections in Cauvery basin (India), Israel, NE-Mexico and Guatemala

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