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The Neandertal type site revisited: Interdisciplinary investigations of skeletal remains from the Neander Valley, Germany (2002)

Schmitz, R. W. ; Serre, D. ; Bonani, G. ; [weitere]

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences of the United States of America. 2002; 99(20): 13342-13347. Published 2002 Sep 13. doi: 10.1073/pnas.192464099.

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Publikationsdatum: 2002-09-13

Print ISSN: 0027-8424

Digitale ISSN: 1091-6490

Thema: Biologie , Medizin , Allgemeine Naturwissenschaft

Publiziert von National Academy of Sciences

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High Resolution 10Be and 230Th Profiles in DSDP Site 580 (1987)

Eisenhauer, Anton ; Mangini, A. ; Segl, M. ; [weitere]

North-Holland

In: Nuclear Instruments & Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 29 . pp. 326-331.

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Publikationsdatum: 2017-02-13

Beschreibung: 10Be and 230Th profiles were measured at Site 580 at a depth of 20 m (230Th and 10Be) and 80 m (10Be), corresponding to 360 ka and 1.5 Ma, respectively, with a resolution of approx. 5000 a. The radiometric sediment accumulation rates of 6.2 cmka ( ± 25%) agree well with the average for the last 730 ka (via paleomagnetic stratigraphy). Age corrected concentrations of 10Be range from 2 to 7 × 109atomsg (average 3.5 ± 1). The variations of the 10Be concentrations can be explained by changes in the sediment supply during different climatic conditions. The maxima and the minima of 10Be follow the fluctuations of excess 230Th in the core section during the last 360 ka. Fluxes of both 10Be and 230Th exceed production and vary remarkably throughout time suggesting enhanced scavenging by bioproductivity. At the Brunhess-Matuyama boundary we observe a maximum of 10Be (6.0 ± 0.3.109atomsg, corresponding to 2.5 σ deviation from the average value). However, the observed large fluctuations of Be-10 throughout the core profile make it difficult to interprete this particular maximum.

Materialart: Article , PeerReviewed

Format: text

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Anomalous AMS radiocarbon ages for foraminifera from high-deposition-rate ocean sediments (1989)

Broecker, W. S. ; Trumbore, S. E. ; Bonani, G. ; [weitere]

Department of Geosciences, University of Arizona

In: Radiocarbon, 31 (2). pp. 157-162.

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Publikationsdatum: 2020-06-04

Beschreibung: Radiocarbon ages on handpicked foraminifera from deep-sea cores are revealing that areas of rapid sediment accumulation are in some cases subject to hiatuses, reworking and perhaps secondary calcite deposition. We present here an extreme example of the impacts of such disturbances. The message is that if precise chronologies or meaningful benthic planktic age differences are to be obtained, then it is essential to document the reliability of radiocarbon ages by making both comparisons between coexisting species of planktomc foraminifera and detailed down-core sequences of measurements.

Materialart: Article , PeerReviewed

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2.11 Preliminary Report on Radiocarbon Dating of Cryptoendolithic Microorganisms (1988)

Bonani, G. ; Friedmann, E. I. ; Ocampo-Friedmann, R. ; [weitere]

Alfred Wegener Institute for Polar and Marine Research & German Society of Polar Research

In: EPIC3Polarforschung, Bremerhaven, Alfred Wegener Institute for Polar and Marine Research & German Society of Polar Research, 58(2/3), pp. 199-200, ISSN: 0032-2490

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Publikationsdatum: 2019-07-17

Repository-Name: EPIC Alfred Wegener Institut

Materialart: "Polarforschung" , peerRev

Format: application/pdf

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