Strontium Isotope Stratigraphy

McArthur, J. M.; Howarth, Richard J.; Shields, Graham; Zhou, Ying

doi:10.1016/b978-0-12-824360-2.00007-3

Cited by 150 publications

(261 citation statements)

References 162 publications

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“…SIS is a well‐established tool for high‐resolution dating and correlation of marine carbonates (DePaolo & Ingram, 1985; Hodell, 1991; McArthur, 1994; McArthur et al., 2020; Palmer & Elderfield, 1985). This method is based on the empirical observation that the Sr‐isotope ratio of the oceanic waters has varied through geological time and on the assumption that the 87 Sr/ 86 Sr ratio at any time is homogeneous, given the long residence time of Sr in seawater compared with the ocean mixing time (McArthur et al, 2020).…”

Section: Methodsmentioning

confidence: 99%

“… b The preferred numerical age has been derived from the look‐up table of McArthur et al. (2020, version 6:03/20). The minimum and max age are calculated by combining the statistical uncertainty of the samples (2 SE of the mean) with the uncertainty of the reference curve (see the methods section in Frijia & Parente, 2008, for a detailed explanation of the procedure). …”

Section: Methodsmentioning

confidence: 99%

“…To correct for interlaboratory bias, the Sr isotope ratios were normalized to the value of the NIST–SRM 987 standard used by McArthur et al. (2020) for their compilation. Only the Sr isotope ratios of bivalve shell material (i.e.…”

Section: Methodsmentioning

confidence: 99%

“…Numerical ages were derived from the Sr isotope ratios by means of the look‐up table of McArthur et al. (2020; version 6:03/20). When more than one shell was available for the same stratigraphic level, the SIS age was derived from the mean value calculated from all the shells.…”

Section: Methodsmentioning

confidence: 99%

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Forebulge migration in the foreland basin system of the central‐southern Apennine fold‐thrust belt (Italy): New high‐resolution Sr‐isotope dating constraints

et al. 2021

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The Apennines are a retreating collisional belt where the foreland basin system, across large domains, is floored by a subaerial forebulge unconformity developed due to forebulge uplift and erosion. This unconformity is overlain by a diachronous sequence of three lithostratigraphic units made of (a) shallow‐water carbonates, (b) hemipelagic marls and shales and (c) siliciclastic turbidites. Typically, the latter two have been interpreted regionally as the onset of syn‐orogenic deposition in the foredeep depozone, whereas little attention has been given to the underlying unit. Accordingly, the rate of migration of the central‐southern Apennine fold‐thrust belt‐foreland basin system has been constrained, so far, exclusively considering the age of the hemipelagites and turbidites, which largely post‐date the onset of foredeep depozone. In this work, we provide new high‐resolution ages obtained by strontium isotope stratigraphy applied to calcitic bivalve shells sampled at the base of the first syn‐orogenic deposits overlying the Eocene‐Cretaceous pre‐orogenic substratum. Integration of our results with published data indicates progressive rejuvenation of the strata sealing the forebulge unconformity towards the outer portions of the fold‐thrust belt. In particular, the age of the forebulge unconformity linearly scales with the pre‐orogenic position of the analysed sites, pointing to an overall constant migration velocity of the forebulge wave in the last 25 Myr.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Forebulge migration in the foreland basin system of the central‐southern Apennine fold‐thrust belt (Italy): New high‐resolution Sr‐isotope dating constraints

et al. 2021

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“…To obtain such look-up chart that lists 87 Sr/ 86 Sr ratios throughout geological time, strontium-isotope measures have to be conducted for a large sample base of well-preserved fossils of known age. One such data set is the LOWESS 5 Fit, a collection of strontium isotope measurements dated every 0.05 million years (McArthur et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Introduction to the Principles of δ18O, δ13C, and 87Sr/86Sr in the Palaeosciences.

Wilkin¹

2021

Preprint

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The stable isotopes of oxygen (O), carbon (C), strontium (Sr), hydrogen (H), and nitrogen (N) have all been utilised for great effect in palaeoclimate, palaeoecological and palaeobiological studies. Of these, O and C have been by far the most important and, in many types of study, their use has become routine in universities and research institutions around the world. Stable isotopes provide quantitative data about palaeotemperatures, metabolic rates, food webs, palaeosalinity, palaeoprecipitation and evaporation rates as well as glacial ice volumes, production and burial of organic carbon, and other processes related to palaeoclimatic/biological/ecological change. Except for Sr, all the previously mentioned isotopes (O, C, H, and N) directly record paleoclimatic, biological and palaeoecological processes. Conversely, Sr reflects the composition of rocks at the Earth's surface, and its values reflect on the climate indirectly as it is a proxy for global weathering rates and seafloor spreading. This review will only be focusing on three isotopes commonly deployed by palaeo-researchers: carbon, oxygen, and strontium.

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The history of calcite diagenesis and origin of exceptionally negative oxygen isotope values in chalks of the Niobrara Formation, Denver Basin, USA

Simon

Budd

Snell

2023

The Depositional Record

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The Niobrara Formation of north‐east Colorado, USA, has anomalously negative δ18O values compared to all other Cretaceous chalks. These unique δ18O values have been attributed to elevated heat flow and/or freshening of the Cretaceous Western Interior Seaway. This work utilises clumped isotopes of calcite (Δ47), peak burial temperatures estimated from pyrolysis data, and strontium and neodymium isotopes of carbonate to re‐evaluate the origin of the calcite's 18O‐depletion. Peak temperatures indicate lateral variability in geothermal gradients of ca 20°C/km at the tens of kilometre scale, and corroborate prior studies proposing locally elevated palaeotemperatures. Greater insight is provided by numerical models of calcite recrystallisation and oxygen isotope evolution that are constrained by measured Δ47‐derived temperatures, calcite δ18O values and inferences from the 87Sr/86Sr and εNd values. The models indicate that (1) sea water in the seaway had normal marine δ18O values of −1 (VSMOW) except on the eastern margin of the basin where some freshwater dilution yielded −2 to −3‰ (VSMOW) water, and (2) the main driver of the anonymously negative calcite δ18O values was a semi‐open hydrologic system that provided a few percent by pore volume of meteoric groundwater derived from post‐Laramide recharge into the basin. Minor contributions were a Laramide‐aged heat pulse related to the underlying Colorado Mineral Belt, the thermal insulating effects of now eroded coals, and a small flux of compaction‐driven Cretaceous sea water evolved by smectite dehydration. However, those three factors alone were insufficient drivers of the calcites' 18O depletion. High burial temperatures are interpreted to have caused clumped isotope reordering in at least one well, but those temperatures cannot yield the observed calcite δ18O values. The study illustrates the unique attributes of the Niobrara's diagenetic system that results in its anomalous δ18O values, and reaffirms the value of clumped isotopes in unravelling the diagenetic history of chalk systems.

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Strontium Isotope Stratigraphy

Cited by 150 publications

References 162 publications

Forebulge migration in the foreland basin system of the central‐southern Apennine fold‐thrust belt (Italy): New high‐resolution Sr‐isotope dating constraints

Forebulge migration in the foreland basin system of the central‐southern Apennine fold‐thrust belt (Italy): New high‐resolution Sr‐isotope dating constraints

Introduction to the Principles of δ18O, δ13C, and 87Sr/86Sr in the Palaeosciences.

The history of calcite diagenesis and origin of exceptionally negative oxygen isotope values in chalks of the Niobrara Formation, Denver Basin, USA

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