Sr-isotopic calibration of Cenozoic bivalvia and Early Miocene migrations: Eurasian Carnivores to Africa (the Hazeva Formation, Israel) and African gazelles and proboscidia to Ipolytarnoc, Hungary

Goldsmith, Naomi F.; Martinell, Jordi; Demarcq, Gérard; Bohn-Havas, Margit; Dockery, David T.

doi:10.1127/nos/31/1994/167

Cited by 6 publications

(2 citation statements)

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“…Az elmúlt 25 év irodalmából (GOLDSMITH et al 1994;VENNEMANN & HEGNER 1998;HUDÁCKOVÁ et al 2003;JANZ & VENNEMAN 2005;PIPPÈRR et al 2007;KOCSIS et al 2007KOCSIS et al , 2009KOCSIS et al , 2012FORDINÁL et al 2014;BRZOBOHATÝ et al 2016;KOCSIS 2016;TESCHNER & REICHENBACHER 2017) a felsőoligocénben induló egri emelettől a felső-miocén pannóniai emeletének alsó részéig terjedő intervallumból 148 publikált 87 Sr/ 86 Sr adatot gyűjtöttünk össze az elektronikus mellék let E1. táblázatában.…”

Section: A Paratethys Miocén Sztratigráfiájaunclassified

Stronciumizotóp-sztratigráfia és alkalmazásai

Kovács¹,

Kovács

Pálfy

2018

Földtani Közlöny

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The late 20 th century revival of stratigraphic methods resulted in a burst of chemostratigraphic techniques and their applications, including the rise of strontium isotope stratigraphy. This method utilizes the measured ratio of radiogenic 87 Sr and non-radiogenic 86 Sr isotopes in samples from sedimentary stratigraphic sections. The residence time of marine Sr, in excess of one million years, is three orders of magnitude longer than the mixing time of the world ocean, resulting in homogenous Sr isotopic composition of seawater that is recorded by marine carbonate phases precipitated in isotopic equilibrium, biogenic low-Mg calcite being the most faithful among them. The marine Sr isotopic ratio has been changing continuously in both directions throughout the Earth history, controlled by the ratio of fluxes of 87 Sr, derived mainly from weathering of continental crustal rocks and delivered to the ocean by riverine influx, and 86 Sr, from juvenile mantle-derived material primarily from volcanic and hydrothermal activity along mid-oceanic ridges. An increasingly reliable, high-resolution reference curve has been constructed form the Neoproterozoic and the entire Phanerozoic, using independently (mostly biostratigraphically) dated samples. Dating of new samples of only broadly constrained age yields the best results, with better than 1 m.y. precision, in steep intervals of the reference curve, i.e. for times of high rate of change in 87 Sr/ 86 Sr. Here we briefly review the theoretical and historical background of the method, the practical issues of sample selection and analytical techniques, and provide case studies from some areas of successful use of Sr isotope stratigraphy. Examples include the Toarcian Jenkyns event, the end-Cretaceous event, and glacial periods in Earth history, when beside their significance for stratigraphic correlation, Sr isotopes provide clues to the causation of major events in Earth history. Sr isotope stratigraphy has been effectively used to solve correlation problems of shallow marine carbonate platforms, where available biostratigraphies are commonly of low-resolution and fraught with problems of global correlation with pelagic zonation schemes. The method is capable to tackle local and regional correlation problems, including issues of global correlation of sedimentary sequences of the Paratethys. Although this inland sea was characterised by partly endemic faunas, the increasing body of available 87 Sr/ 86 Sr data, as compiled here, provides fresh insight into its stratigraphic and palaeoceanographic evolution. This review intends to pave the way of incorporating Sr isotope results into regional stratigraphic syntheses and to promote further use of this method in Hungary.

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Section: A Paratethys Miocén Sztratigráfiájaunclassified

Stronciumizotóp-sztratigráfia és alkalmazásai

Kovács¹,

Kovács

Pálfy

2018

Földtani Közlöny

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“…Savage [ 7 ] discussed the age of the Negev fauna and found that it can hardly be differentiated from Gebel Zelten, which he correlated with uppermost MN3. Goldsmith et al [ 8 ] radiometrically-dated oysters from a level a few meters above the vertebrates at 17.9 Ma. Wood and Goldsmith [ 9 ] re-examined the micromammal fauna and suggested the presence of a “new species of primitive pedetid, provisionally referred to Megapedetes ”, Metasayimys cf.…”

Section: Introductionmentioning

confidence: 99%

A Transitional Gundi (Rodentia: Ctenodactylidae) from the Miocene of Israel

et al. 2016

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We describe a new species of gundi (Rodentia: Ctenodactylidae: Ctenodactylinae), Sayimys negevensis, on the basis of cheek teeth from the Early Miocene of the Rotem Basin, southern Israel. The Rotem ctenodactylid differs from all known ctenodactylid species, including Sayimys intermedius, which was first described from the Middle Miocene of Saudi Arabia. Instead, it most resembles Sayimys baskini from the Early Miocene of Pakistan in characters of the m1-2 (e.g., the mesoflexid shorter than the metaflexid, the obliquely orientated hypolophid, and the presence of a strong posterolabial ledge) and the upper molars (e.g., the paraflexus that is longer than the metaflexus). However, morphological (e.g., presence of a well-developed paraflexus on unworn upper molars) and dimensional (regarding, in particular, the DP4 and M1 or M2) differences between the Rotem gundi and Sayimys baskini distinguish them and testify to the novelty and endemicity of the former. In its dental morphology, Sayimys negevensis sp. nov. shows a combination of both the ultimate apparition of key-characters and incipient features that would be maintained and strengthened in latter ctenodactylines. Thus, it is a pivotal species that bridges the gap between an array of primitive ctenodactylines and the most derived, Early Miocene and later, gundis.

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