Translating Milankovitch climate forcing into eustatic fluctuations via thermal deep water expansion: a conceptual link

Schulz, Michael; Schäfer-Neth, Christian

doi:10.1111/j.1365-3121.1997.tb00018.x

Cited by 60 publications

(30 citation statements)

References 10 publications

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“…In greenhouse periods such as during the Oxfordian and Kimmerdigian, cyclical climate changes translated into low-amplitude sea-level changes through waxing and waning of mountain glaciers and possibly also some small polar ice caps (Fairbridge 1976), through thermal expansion and retraction of the ocean surface water (Gornitz et al 1982), through modifications in thermohaline oceanic circulations (Schulz & Schäfer-Neth 1998) and/or through changes in water storage in lakes and aquifers (Jacobs & Sahagian 1993). On the shallow Jura platform, these sea-level fluctuations were recorded quite faithfully because relatively high subsidence rate (Wildi et al 1989) created enough accommodation space.…”

Section: Discussionmentioning

confidence: 99%

Astronomical time scale for the Middle Oxfordian to Late Kimmeridgian in the Swiss and French Jura Mountains

Strasser

2007

Swiss j geosci

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Detailed investigation of facies and sedimentary structures reveals that, during the Middle Oxfordian to Late Kimmeridgian, the shallow carbonate platform of the Swiss and French Jura Mountains recorded high-frequency sea-level fluctuations quite faithfully. The cyclostratigraphic analysis within the established biostratigraphic and sequence-chronostratigraphic framework implies that the resulting hierarchically stacked depositional sequences formed in tune with the orbital cycles of precession (20 kyr) and eccentricity (100 and 400 kyr). The astronomical time scale presented here is based on the correlation of 19 platform sections and 4 hemipelagic sections from south-eastern France where good biostratigraphic control is available. The cyclostratigraphic interpretation suggests that the interval between sequence boundaries Ox4 and Kim1 (early Middle Oxfordian to earliest Kimmeridgian) lasted 3.2 myr and that the Kimmeridgian sensu gallico has a duration of 3.2 to 3.3 myr. The astronomical time scale proposed here is compared to time scales established by other authors in other regions and the discrepancies are discussed. Despite these discrepancies, there is a potential to estimate the durations of ammonite zones and depositional sequences more precisely and to better evaluate the rates of sedimentary, ecological and diagenetic processes.

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Section: Discussionmentioning

confidence: 99%

Astronomical time scale for the Middle Oxfordian to Late Kimmeridgian in the Swiss and French Jura Mountains

Strasser

2007

Swiss j geosci

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“…However, orbitally driven changes in insolation translate into sea-level changes through several feedback mechanisms (Gornitz et al, 1982;Schulz and Schäfer-Neth, 1998;Jacobs and Sahagian, 1993). It can be assumed that irregularities caused by complex climate-ocean coupling occurred, even if their amplitudes were certainly less than in glacioeustatically dominated times such as the Pleistocene and Holocene (e.g., Kindler and Hearty, 1996;Peltier, 1988).…”

Section: Reconstruction Of Eustatic Sea-level Changesmentioning

confidence: 99%

“…Orbitally controlled climatic changes would have resulted in only minor glacio-eustatic sea-level fluctuations. However, insolation changes could also contribute to low-amplitude sea-level fluctuations through thermal expansion and contraction of the uppermost layer of ocean water (Gornitz et al, 1982), thermally induced volume changes in deep-water circulation (Schulz and Schäfer-Neth, 1998), and/or water retention and release in lakes and aquifers (Jacobs and Sahagian, 1993).…”

Section: Reconstruction Of High-frequency Eustatic Sea-level Fluctuatmentioning

confidence: 99%

Cyclostratigraphic Timing of Sedimentary Processes: An Example From the Berriasian of the Swiss and French Jura Mountains

Strasser

Hillgärtner

Pasquier

2004

Cyclostratigraphy: Approaches and Case Histories

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ABSTRACT:The Berriasian Pierre-Châtel Formation in the Swiss and French Jura Mountains is dominated by shallow-marine carbonates that overlie lacustrine and marginal-marine sediments with a major transgressive surface. Detailed facies analysis of five sections allows the definition of elementary and small-scale depositional sequences, which commonly exhibit deepening-shallowing trends. Benthic foraminifera and rare ammonites on the platform, as well as a sequence-stratigraphic correlation with a well-dated deeper-water section, furnish the biostratigraphic framework. Thus, the large-scale sequence boundaries below and at the top of the Pierre-Châtel Formation can be correlated with dated boundaries in other European basins. This time constraint and the hierarchical stacking pattern on the platform as well as in the basin suggest that the sea-level fluctuations influencing the formation of the depositional sequences were controlled, at least partly, by Milankovitch cycles. The elementary sequences correspond to the 20 ky precession cycle, and the small-scale sequences to the 100 ky eccentricity cycle.Uncertainties in the definition of sequences exist if facies contrasts are too low to develop clearly marked sequence boundaries or maximum-flooding intervals. Nevertheless, a best-fit solution for the correlation of the small-scale sequences between the studied sections can be proposed. The lowermost three small-scale sequences of the Pierre-Châtel Formation are analyzed in detail. They are decompacted and correlated on the level of the elementary sequences. Within this relatively precise time frame, the flooding of the Jura platform (following the early Berriasian sea-level lowstand) can be monitored. It is seen that the transgression occurred stepwise: every 20 ky, a transgressive pulse established marine facies farther towards the platform interior.This study demonstrates that the cyclostratigraphical approach makes it possible to construct a narrow time frame, within which the rates of sedimentary, ecological, and diagenetic processes can be evaluated, phases of differential subsidence identified, and the durations of stratigraphic gaps estimated. The complex and dynamic evolution of an ancient carbonate platform can thus be studied with a time resolution of 20 to 100 ky.

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“…This asymmetry is well known from the oxygen-isotope proxy record of the Late Pleistocene (Hays et al 1976). In greenhouse periods, the fluctuating volume of small mountain glaciers (Frakes et al 1992), thermal expansion and retraction of the uppermost layer of ocean water (Gornitz et al 1982), thermally-induced volume changes in deep-water circulation (Schulz & Schäfer-Neth 1998), and/or water retention and release in lakes and aquifers (Jacobs & Sahagian 1993) may contribute to low-amplitude sea-level changes. Eustatic sea level, together with subsidence, controls accommodation.…”

Section: From Astronomical Cycles To the Sedimentary Recordmentioning

confidence: 99%

Cyclostratigraphy concepts, definitions, and applications

Strasser¹,

Heckel²

2007

nos

153

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Abstract. Cyclostratigraphy is the subdiscipline of stratigraphy that deals with the identification, characterization, correlation, and interpretation of cyclic variations in the stratigraphic record and, in particular, with their application in geochronology by improving the accuracy and resolution of time-stratigraphic frameworks. As such it uses astronomical cycles of known periodicities to date and interpret the sedimentary record. The most important of these cycles are the Earth's orbital cycles of precession, obliquity, and eccentricity (Milankovitch cycles), which result from perturbations of the Earth's orbit and its rotational axis. They have periods ranging from 20 to 400 kyr, and even up to millions of years. These cycles translate (via orbital-induced changes in insolation) into climatic, oceanographic, sedimentary, and biological changes that are potentially recorded in the sedimentary archives through geologic time. Many case studies have demonstrated that detailed analysis of the sedimentary record (stacking patterns of beds, disconformities, facies changes, fluctuations in biological composition, and/or changes in geochemical composition) enables identification of these cycles with high confidence. Once the relationship between the sedimentary record and the orbital forcing is established, an unprecedented high time resolution becomes available, providing a precise and accurate framework for the timing of Earth system processes. For the younger part of the geologic past, astronomical time scales have been constructed by tuning cyclic palaeoclimatic records to orbital and insolation target curves; these time scales are directly tied to the Present. In addition, the astronomical tuning has been used to calibrate the 40 Ar/ 39 Ar dating method. In the older geologic past, "floating" astronomical time scales provide a high time resolution for stratigraphic intervals, even if their radiometric age is subject to the error margins of the dating techniques.Because the term "sedimentary cycle" is used in many different ways by the geologic community and does not always imply time significance, we propose using "astrocycle" once the cycle periodicity has been demonstrated by a thorough cyclostratigraphic analysis.

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Translating Milankovitch climate forcing into eustatic fluctuations via thermal deep water expansion: a conceptual link

Cited by 60 publications

References 10 publications

Astronomical time scale for the Middle Oxfordian to Late Kimmeridgian in the Swiss and French Jura Mountains

Astronomical time scale for the Middle Oxfordian to Late Kimmeridgian in the Swiss and French Jura Mountains

Cyclostratigraphic Timing of Sedimentary Processes: An Example From the Berriasian of the Swiss and French Jura Mountains

Cyclostratigraphy concepts, definitions, and applications

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