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  • 1
    Online Resource
    Online Resource
    Chronology, causes and progression of the Messinian salinity crisis
    Springer Science and Business Media LLC ; 1999
    In:  Nature Vol. 400, No. 6745 ( 1999-8), p. 652-655
    Details
    In: Nature, Springer Science and Business Media LLC, Vol. 400, No. 6745 ( 1999-8), p. 652-655
    Type of Medium: Online Resource
    ISSN: 0028-0836 , 1476-4687
    URL: Article
    DOI: 10.1038/23231
    RVK:
    TA 1000
    RVK:
    UA 1000
    RVK:
    WA 15000
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 1999
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  • 2
    Online Resource
    Online Resource
    On the origin of Upper Miocene sapropelites: A case study from the Faneromeni Section, Crete (Greece)
    American Geophysical Union (AGU) ; 1996
    In:  Paleoceanography Vol. 11, No. 5 ( 1996-10), p. 633-645
    Details
    In: Paleoceanography, American Geophysical Union (AGU), Vol. 11, No. 5 ( 1996-10), p. 633-645
    Abstract: For the first time, results of an integrated geochemical and micropalaeontological study of upper Miocene sapropelites in a land‐based section in the Mediterranean are presented. Three sapropelites and adjacent homogeneous intervals in the Cretan Faneromeni section have been investigated in detail. The chemical and foraminiferal characteristics were found to be markedly similar to those of Plio‐Pleistocene sapropelites. As the physiography and climate of the late Miocene Mediterranean were not fundamentally different from those of today, our preferred model for late Miocene sapropelite formation is similar to the one recently developed for Plio‐Pleistocene sapropelites. Increased seasonality and freshwater input during northern hemisphere summer insolation maxima triggered high export production and oxygen consumption rates, which, in combination with a concomitant decrease in deep water formation rate, resulted in the observed high organic matter content of the sapropelites.
    Type of Medium: Online Resource
    ISSN: 0883-8305 , 1944-9186
    URL: Article
    DOI: 10.1029/96PA01963
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1996
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  • 3
    Online Resource
    Online Resource
    Punctuated evolution of global climate cooling during the Late Middle to Early Late Miocene: High‐resolution planktonic foraminiferal and oxygen isotope records from the Mediterranean
    American Geophysical Union (AGU) ; 2001
    In:  Paleoceanography Vol. 16, No. 4 ( 2001-08), p. 405-423
    Details
    In: Paleoceanography, American Geophysical Union (AGU), Vol. 16, No. 4 ( 2001-08), p. 405-423
    Abstract: High‐resolution planktonic foraminiferal and oxygen isotope records are presented from a Mediterranean deep marine succession, dated astronomically between 12.12 and 9.78 Ma. Planktonic and benthic oxygen isotope records are punctuated by two episodes of δ 18 O increase, which have astronomical ages of 11.4 and 10.4 Ma and correspond to the Mi5 and Mi6 events of Miller et al. [1991a]. These ice growth events coincide with low‐amplitude variations in the 1.2 Myr obliquity cycle and are accompanied by significant faunal changes in the Mediterranean, such as the arrival of neogloboquadrinids, the increase in abundance of the G. apertura‐G. obliquus group, and the areal differentiation between N. atlantica and N. acostaensis . Short‐term variations in the planktonic foraminiferal and oxygen isotope records correspond to dominantly precession‐controlled sedimentary cycles. Features of the sapropel/grey marl layers indicate that the short‐term astronomically controlled circum‐Mediterranean climate changes remained basically the same over the last 12 Myr.
    Type of Medium: Online Resource
    ISSN: 0883-8305 , 1944-9186
    URL: Article
    DOI: 10.1029/2000PA000509
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2001
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  • 4
    Online Resource
    Online Resource
    Evaluation of the astronomically calibrated time scale for the Late Pliocene and Earliest Pleistocene
    American Geophysical Union (AGU) ; 1993
    In:  Paleoceanography Vol. 8, No. 5 ( 1993-10), p. 549-565
    Details
    In: Paleoceanography, American Geophysical Union (AGU), Vol. 8, No. 5 ( 1993-10), p. 549-565
    Abstract: An astronomically calibrated time scale was recently established (Hilgen, 1991a, b) for the Pliocene and earliest Pleistocene, based on the correlation of dominantly precession‐controlled sedimentary cycles (sapropels and CaCO 3 cycles) in Mediterranean deep‐sea sections to astronomical solution Ber90 (Berger and Loutre, 1991). This time scale, which differed substantially from the conventional time scales then widely used, is essentially confirmed by a new generation of radiometric dates using the 40 Ar/ 39 Ar laser fusion technique. To evaluate this time scale, we here extract both precession‐ and obliquity‐related components from late Pliocene‐earliest Pleistocene climatic proxy records in the Mediterranean and determine coherencies and phase (time) lags between these components and the respective orbital variations. This work is found to support the new time scale, because significant coherencies are found between the astronomically related components in our proxy records and the orbital variations, not only at the main period of precession but also at the main period of obliquity and, because of the eccentricity modulation of precession, in the low‐frequency eccentricity bands of the spectrum. But the calculated time lag between obliquity and 41‐kyr components in the climatic proxy records shows a significant increase of 5.6 (±1) kyr with respect to the late Pleistocene if the phase relation with precession is kept constant. This increase can be explained by a change in the climate response time to obliquity or to precession, by a small uncertainty in the astronomical solution, or by a combination of these factors.
    Type of Medium: Online Resource
    ISSN: 0883-8305 , 1944-9186
    URL: Article
    DOI: 10.1029/93PA01248
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1993
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  • 5
    Online Resource
    Online Resource
    Present status of the astronomical (polarity) time-scale for the Mediterranean Late Neogene
    The Royal Society ; 1999
    In:  Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences Vol. 357, No. 1757 ( 1999-07-15), p. 1931-1947
    Details
    In: Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences, The Royal Society, Vol. 357, No. 1757 ( 1999-07-15), p. 1931-1947
    Type of Medium: Online Resource
    ISSN: 1364-503X , 1471-2962
    URL: Article
    DOI: 10.1098/rsta.1999.0408
    RVK:
    AX 30011
    Language: English
    Publisher: The Royal Society
    Publication Date: 1999
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    SSG: 5,1
    SSG: 5,21
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  • 6
    Online Resource
    Online Resource
    Late Gauss to Early Matuyama invasions of Neogloboquadrina Atlantica in the Mediterranean and associated record of climatic change
    American Geophysical Union (AGU) ; 1990
    In:  Paleoceanography Vol. 5, No. 2 ( 1990-04), p. 239-252
    Details
    In: Paleoceanography, American Geophysical Union (AGU), Vol. 5, No. 2 ( 1990-04), p. 239-252
    Abstract: A well‐dated, high‐resolution record of climatic change is presented for the late Pliocene Mediterranean. Principal component analysis on abundances of 14 planktonic foraminiferal species reveals a series of late Gauss to early Matuyama surface water cooling events which can be correlated with North Atlantic glacial isotope stages 108 to 94. The abundance record of the benthic foraminifer Trifarina angulosa suggests lowered bottom water temperatures at times of surface water cooling. The record of surface water oxygen and carbon isotopes shows an inverse pattern with δ 18 O maxima and δ 13 C minima at times of cool sea surface temperature conditions. Concomitant decrease in P/B value and increased admixtures of clastic material suggest that late Gauss to early Matuyama surface water cooling events in the Mediterranean are accompanied with glacioeustatic sea level low‐stands. Major surface water cooling events are associated with invasions of Neogloboquadrina atlantica . This North Atlantic mid‐ to high‐latitude species is at 2.55 Ma close to the Gibraltar portal whereafter it could invade the Mediterranean repeatedly during periods of climatic cooling until it disappears from all over the North Atlantic and Mediterranean at the end of glacial stage 96.
    Type of Medium: Online Resource
    ISSN: 0883-8305 , 1944-9186
    URL: Article
    DOI: 10.1029/PA005i002p00239
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1990
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  • 7
    Online Resource
    Online Resource
    Synchronizing Rock Clocks of Earth History
    American Association for the Advancement of Science (AAAS) ; 2008
    In:  Science Vol. 320, No. 5875 ( 2008-04-25), p. 500-504
    Details
    In: Science, American Association for the Advancement of Science (AAAS), Vol. 320, No. 5875 ( 2008-04-25), p. 500-504
    Abstract: Calibration of the geological time scale is achieved by independent radioisotopic and astronomical dating, but these techniques yield discrepancies of ∼1.0% or more, limiting our ability to reconstruct Earth history. To overcome this fundamental setback, we compared astronomical and 40 Ar/ 39 Ar ages of tephras in marine deposits in Morocco to calibrate the age of Fish Canyon sanidine, the most widely used standard in 40 Ar/ 39 Ar geochronology. This calibration results in a more precise older age of 28.201 ± 0.046 million years ago (Ma) and reduces the 40 Ar/ 39 Ar method's absolute uncertainty from ∼2.5 to 0.25%. In addition, this calibration provides tight constraints for the astronomical tuning of pre-Neogene successions, resulting in a mutually consistent age of ∼65.95 Ma for the Cretaceous/Tertiary boundary.
    Type of Medium: Online Resource
    ISSN: 0036-8075 , 1095-9203
    URL: Article
    DOI: 10.1126/science.1154339
    RVK:
    TA 1000
    RVK:
    WA 15000
    Language: English
    Publisher: American Association for the Advancement of Science (AAAS)
    Publication Date: 2008
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    detail.hit.zdb_id: 2066996-3
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  • 8
    Online Resource
    Online Resource
    The formation of Pliocene sapropels and carbonate cycles in the Mediterranean: Diagenesis, dilution, and productivity
    American Geophysical Union (AGU) ; 1994
    In:  Paleoceanography Vol. 9, No. 4 ( 1994-08), p. 601-617
    Details
    In: Paleoceanography, American Geophysical Union (AGU), Vol. 9, No. 4 ( 1994-08), p. 601-617
    Abstract: High‐resolution micropaleontological (planktonic foraminifera and calcareous nannofossils) and geochemical (stable isotopes, organic carbon, Fe, P, S, Ca, Ba, Mn, and Al) records are presented for the first sapropel‐containing carbonate cycle in the Pliocene of Sicily. The carbonate cycle is characterized by a gray to white to beige to white color layering typical of the marls of the Trubi formation. A faintly laminated sapropel is intercalated in the gray‐colored bed of the carbonate cycle. CaCO 3 content varies from 40% in the beige to 45‐50% in the white layers. Lowest CaCO 3 content of 25–30% is found in the gray layer and sapropel. Variations in carbonate and organic matter percentages can best be explained by changes in paleoproductivity rather than by variations in dilution and dissolution. Total productivity was highest during deposition of the gray layer and sapropel, as indicated by high organic carbon and Ba contents and high abundance of Globorotalia puncticulata . Carbonate production reached its highest values, however, during deposition of the white layers, as evidenced by enhanced abundances of planktonic foraminifera and nannofossils. The low carbonate content in the gray layer and sapropel is explained in terms of a collapse in carbonate production caused by extreme changes in the physical and biochemical properties of the water column, which in turn resulted in siliceous plankton and opportunistic foraminifers such as Globorotalia puncticulata outcompeting most calcareous organisms. The beige layer represents a low‐productivity environment similar to the present‐day eastern Mediterranean basin. Several mechanisms have previously been proposed to explain variations in productivity in the eastern Mediterranean. Both sapropels and gray layers were deposited at times when perihelion occurred in northern hemisphere summer. We envisage that the increase in seasonal contrast resulting from this orbital configuration enhanced winter mixing and stabilization of the water column during summer, both leading to favorable conditions for intensification of the spring bloom. In addition, a decrease in excess evaporation, as can be deduced from the δ 18 O record, led to shoaling of the pycnocline and reduced circulation, thus enhancing the availability of nutrients in the photic zone. Finally, enhanced precipitation and associated runoff should have caused an increase in river‐borne nutrients.
    Type of Medium: Online Resource
    ISSN: 0883-8305 , 1944-9186
    URL: Article
    DOI: 10.1029/94PA00597
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1994
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  • 9
    Online Resource
    Online Resource
    Simulation of climate phase lags in response to precession and obliquity forcing and the role of vegetation
    Springer Science and Business Media LLC ; 2005
    In:  Climate Dynamics Vol. 24, No. 2-3 ( 2005-2), p. 279-295
    Details
    In: Climate Dynamics, Springer Science and Business Media LLC, Vol. 24, No. 2-3 ( 2005-2), p. 279-295
    Type of Medium: Online Resource
    ISSN: 0930-7575 , 1432-0894
    URL: Article
    DOI: 10.1007/s00382-004-0490-1
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2005
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    SSG: 16,13
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  • 10
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    An astronomical polarity timescale for the late middle Miocene based on cyclic continental sequences : APTS FOR THE LATE MIDDLE MIOCENE
    American Geophysical Union (AGU) ; 2003
    In:  Journal of Geophysical Research: Solid Earth Vol. 108, No. B3 ( 2003-03)
    Details
    In: Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 108, No. B3 ( 2003-03)
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2002JB001818
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2003
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