Berriasian Ammonite and Calpionellid Associations from the North-South Range of Central Tunisia: Updated Biozonation, Regional Geodynamic Context and Paleobiogeography

Nsir, Sana Ben; Boughdiri, Mabrouk; Cherif, Ichrak; Bahrouni, Nejib; Ferchichi, Rafika; Zrelli, Asma

doi:10.1007/978-3-030-01452-0_20

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“…The Sidi Khalif Formation at Jebel Meloussi locality (central Tunisia) is one of the most suitable section for this purpose. Indeed, extensive stratigraphic studies (mainly biostratigraphic investigations) have been widely carried out on this Formation during the last few decades (Burollet, 1956;Memmi, 1967;Busnardo et al, 1976Busnardo et al, , 1981Maalaoui and Zargouni, 2016a,b;Ben Nsir et al, 2019) but some of them are controversial (e.g., M'Rabet, 1987;Maalaoui and Zargouni, 2016a;Ben Nsir and Boughdiri, 2017). In this context, several studies (Allen, 1981(Allen, , 1998Hallam, 1984Hallam, , 1985Hallam, , 1986Deconinck and Strasser, 1987;Hallam et al, 1991;Deconinck, 1993;Ruffell and Rawson, 1994;Price, 1999) have evidenced the existence of widespread dry and cold climate period during the upper Jurassic.…”

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confidence: 99%

Linking the Variation of Sediment Accumulation Rate to Short Term Sea-Level Change Using Cyclostratigraphy: Case Study of the Lower Berriasian Hemipelagic Sediments in Central Tunisia (Southern Tethys)

2021

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High-resolution magnetic susceptibility and % CaCO3 records (5 to 10 cm sampling interval) are used to track astronomical cycles from a Lower Berriasian record from central Tunisia. Six hundred and twenty two samples were measured for magnetic susceptibility and carbonate content as paleoclimate proxies for the detection of potential Milankovitch cycles. Elemental data using X-Ray fluorescence analyses was acquired from 19 samples to prove the reliability of the MS signal on recording the past paleoclimatic changes. We performed multiple spectral analyses and statistical techniques on the magnetic susceptibility signal, such as Multi-taper Method, Evolutive Harmonic Analysis, Correlation Coefficient, Time-optimization, and Average Spectral Misfit to obtain an optimal astronomical model. The application of these spectral analysis techniques revealed a pervasive dominance of E405-kyr and e100-kyr cycles showing that the climate turnover across the early Berriasian—middle Berriasian seems to had been governed by the long and short orbital eccentricity cycles. The identification of Milankovitch cycles in the record also allowed to propose a floating astronomical timescale of the studied section, with ~4 long eccentricity cycles (E405) extracted, which points to a duration estimate of ~1.6 Myr with an average sediment accumulation rate (SAR, after compaction) of 2.77 cm/kyr. The inferred floating ATS was tuned to the La2004 astronomical solution. In addition, we applied the DYNOT and ρ1 methods for seal-level change modeling to reconstruct a local eustatic profile which matches the previously published local and global eustatic charts.

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