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Husing, Silja
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Husing, Silja
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- PublicationRestrictedAstronomical tuning of the La Vedova section between 16.3 and 15.0 Ma. Implications for the origin of megabeds and the Langhian GSSP(2017-01)
; ; ; ; ; ; ; ; ;; ; ; ; The early–middle Miocene, marked by the Middle Miocene Climatic Optimum (MMCO) followed by the Middle Miocene Climate Transition (MMCT) towards cooler temperatures, represents a crucial period in Earth’s climate evolution. To understand this episode and reconstruct its origin and the regional impact of the observed global changes, it is critical that high-resolution astronomical age models are developed for climate sensitive regions around the world. One of these areas undoubtedly is the Mediterranean, but so far no such an age model has been established for the interval of the MMCO. Nevertheless, this interval is well exposed in the coastal cliffs along the Adriatic Sea near Ancona (Italy), where it is characterized by the occurrence of 7 conspicuous limestone beds, termed megabeds, alternating with marl intervals. Here, we use the Lower La Vedova Beach section to construct an astronomical time scale for the younger part of the MMCO in the Mediterranean. The tuning to ~ 100-kyr eccentricity seems robust, but is less certain for precession in some intervals, as a consequence of the less clearly developed internal structure of the basic precession related cycles and uncertainties in the phase relation with climatic precession and insolation and in the astronomical solution in terms of tidal dissipation and dynamical ellipticity values. The tuning nevertheless provides astronomical ages for calcareous plankton events and magnetic reversals for the interval between 16.3 and 15.0 Ma. Individual megabeds are related to the ~ 100-kyr eccentricity cycle corresponding to eccentricity minima and the megabed interval itself is partly controlled by the 405-kyr cycle, as it marks two successive minima and the maximum in between. However, no relation with very long period eccentricity cycles (2.4 and 1 myr) is evident, and a link to regional tectonic processes (a major orogenic phase at the base of the Langhian and the likely associated Langhian transgression) seems more plausible. The higher sedimentation rate in the megabeds can be explained by the additional preservation of biogenic silica, which may also account for the diluted planktonic foraminiferal assemblages. With the integrated magnetobiostratigraphy and the tuning to eccentricity and to precession/insolation, the Lower La Vedova Beach section meets key requirements for defining the Langhian GSSP.355 12 - PublicationRestrictedAstronomical tuning of the La Vedova High Cliff section (Ancona, Italy)—Implications of the Middle Miocene Climate Transition for Mediterranean sapropel formation(2010-08-15)
; ; ; ; ; ; ; ;Mourik, A. A.; Stratigraphy/Paleontology, Department of Earth Sciences, Utrecht University, Budapestlaan 4, 3584 CD Utrecht, The Netherlands ;Bijkerk, J. F.; Stratigraphy/Paleontology, Department of Earth Sciences, Utrecht University, Budapestlaan 4, 3584 CD Utrecht, The Netherlands ;Cascella, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Hüsing, S. K.; Paleomagnetic Laboratory “Fort Hoofddijk”, Department of Earth Sciences, Budapestlaan 17, 3584 CD Utrecht, The Netherlands ;Hilgen, F. J.; Stratigraphy/Paleontology, Department of Earth Sciences, Utrecht University, Budapestlaan 4, 3584 CD Utrecht, The Netherlands ;Lourens, L. J.; Stratigraphy/Paleontology, Department of Earth Sciences, Utrecht University, Budapestlaan 4, 3584 CD Utrecht, The Netherlands ;Turco, E.; Dip. di Scienze della Terra, Universita di Parma, Parco Area della Scienze 157/A, 16 43100 Parma, Italy; ; ; ;; ; Continuous marine successions covering the Middle Miocene Climate Transition (MMCT; ∼15–13.7 Ma) are scarce and the lack of a high-resolution magnetobiostratigraphic framework hampers the construction of astronomically tuned age models for this time interval. The La Vedova High Cliff section, exposed along the coast of the Cònero Riviera near Ancona (Italy), is one of the few Mediterranean sections covering the critical time interval of the MMCT. Starting from an initial magnetobiostratigraphic age model, a robust astronomical tuning was constructed for the interval between 14.2 and 13.5 Ma, using geochemical element data and time series analysis. A shift in δ18O of bulk sediment towards heavier values occurs between ∼13.92 and 13.78 Ma and could be related to the Mi3b oxygen isotope event, which reflects the rapid expansion of the East Antarctic Ice Sheet in the middle Miocene. The onset of the CM6 carbon excursion is reflected in the bulk record by a rapid increase in δ13C at 13.86 Ma. Our results confirm the proposition that these events coincide with a 405-kyr minimum in eccentricity and a node in obliquity related to the ∼1.2 Myr cycle. From 13.8 Ma onwards, distinct quadruplet cycles containing sapropelitic sediments were deposited. This may suggest a causal connection between the main middle Miocene cooling step and the onset of sapropel formation in the Mediterranean.211 31 - PublicationRestrictedAstronomical tuning of the La Vedova High Cliff Section (Ancona, Italy) - Implications of the Middle Miocene Climate Transition for Mediterranean sapropel formation(2010-05)
; ; ; ; ; ; ; ;Mourik, A. A.; Stratigraphy/Paleontology, Department of Earth Sciences, Utrecht University, Budapestlaan 4, 3584 CD Utrecht, The Netherlands ;Bijkerk, J. F.; Stratigraphy/Paleontology, Department of Earth Sciences, Utrecht University, Budapestlaan 4, 3584 CD Utrecht, The Netherlands ;Cascella, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Hüsing, S. K.; Paleomagnetic Laboratory “Fort Hoofddijk”, Department of Earth Sciences, Budapestlaan 17, 3584 CD Utrecht, The Netherlands ;Hilgen, F. J.; Stratigraphy/Paleontology, Department of Earth Sciences, Utrecht University, Budapestlaan 4, 3584 CD Utrecht, The Netherlands ;Lourens, L. J.; Stratigraphy/Paleontology, Department of Earth Sciences, Utrecht University, Budapestlaan 4, 3584 CD Utrecht, The Netherlands ;Turco, E.; Dip. di Scienze della Terra, Universita di Parma, Parco Area della Scienze 157/A, 16 43100 Parma, Italy; ; ; ;; ; Continuous marine successions covering the Middle Miocene Climate Transition (MMCT; -15-13.7 Ma) are scarce and the lack of a high-resolution magnetobiostratigraphic framework hampers the construction of astronomically tuned age models for this time interval. The La Vedova High Cliff section, exposed aiong the coast of the Cònero Riviera near Ancona (Italy), is one of the few Mediterranean sections covering the critica1 time interval of the MMCT. Starting from an initial magnetobiostratigraphic age model, a robust astronomica1 tuning was constructed for the intewal between 14.2 and 13.5 Ma, using geochemical element data and time series analysis. A shift in 6180 of bulk sediment occurs between -13.92 and 13.78 Ma and can be related to the Mi3b oxygen isotope event, reflecting the rapid expansion of the East Antarctic Ice Sheet in the Middle Miocene. The onset of the 6°C CM6 carbon excursion is dated at -13.86 Ma. OUr results confirm the proposition that these events coincide with a 405-kyr minimum in eccentricity and a node in obliquity related t0 the -1.2 Myr cycle. From 13.8 Ma onwards, distinct quadruplet cycles containing sapropelitic sediments are observed, suggesting a causa1 connection between the main Middle Miocene cooling step and sedimentation and circulation in the Mediterranean.185 27 - PublicationRestrictedAstrochronology of the Mediterranean Langhian between 15.29 and 14.17 Ma(2010-02)
; ; ; ; ; ; ; ;Hüsing, S. K.; Paleomagnetic Laboratory “Fort Hoofddijk”, Department of Earth Sciences, Budapestlaan 17, 3584 CD Utrecht, The Netherlands ;Cascella, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Hilgen, F. J.; Stratigraphy/Paleontology, Department of Earth Sciences, Utrecht University, Budapestlaan 4, 3584 CD Utrecht, The Netherlands ;Krijgsman, W.; Paleomagnetic Laboratory “Fort Hoofddijk”, Department of Earth Sciences, Budapestlaan 17, 3584 CD Utrecht, The Netherlands ;Kuiper, K. F.; Department of Isotope Geochemistry, Vrije Universiteit Amsterdam, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands ;Turco, E.; Dip. di Scienze della Terra, Universita di Parma, Parco Area della Scienze 157/A, 43100 Parma, Italy ;Wilson, D.; Department of Geological Sciences, University of California, Santa Barbara, CA 93106, USA ;; ; ; ; ; An integrated high-resolution magnetobiocyclostratigraphy including radioisotopic dating and astronomical tuning is presented for the interval between 15.29 and 14.17 Ma in the marine La Vedova section in northern Italy. The natural remanent magnetization is carried by the iron sulphide greigite and the resultant magnetostratigraphy can be correlated straightforwardly to the interval ranging from C5Bn.2n to C5ADn in the Astronomically Tuned Neogene Time Scale (ATNTS2004). Spectral analysis on high-resolution magnetic susceptibility and geochemical proxy records in the depth domain and, using our magnetobiostratigraphic age model, in the time domain demonstrate that the various scales of cyclicity in the section are related to astronomical climate forcing. Starting from our initial age model, larger-scale cycles were first tuned to eccentricity. This first-order tuning was followed by tuning the basic cycle to precession and boreal summer insolation using inferred phase relations between maxima in Ca/Al, redox-sensitive elements and Ba, and minima in magnetic susceptibility, and maxima in precession and minima in obliquity and boreal summer insolation. Our astronomical ages for reversal boundaries are supported by analysis of sea floor spreading rates and should replace the existing ages in the ATNTS2004 lacking direct astronomical control. Two major steps in the geochemical proxy records, astronomically dated at 15.074 and 14.489 Ma, coincide with abrupt changes in sedimentation rate, and are the result of the combined effect of the ∼400-kyr eccentricity cycle superimposed upon a longer-term climatic or tectonic induced trend.285 24