Strontium-isotope stratigraphy: applications in basin modelling and reservoir correlation

Smalley, P. C.; Råheim, A.; Rundberg, Yngve; Johansen, H.

doi:10.1007/978-94-009-1149-9_3

Cited by 3 publications

(3 citation statements)

References 27 publications

(25 reference statements)

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“…Successive suites of palynomorphs may therefore be used to correlate sedimentary sequences within an individual basin, but in order to apply a date to individual suites, these must be dated independently in each basin by reference to marine fossils, or today perhaps through strontium isotope dating of calcareous benthonics (Rundberg and Smalley et al 1989), before accurate ages to the assemblages can be applied. Miospores are subsequently used more to correlate, rather than directly to date sediments.…”

Section: Hopping Andmentioning

confidence: 99%

Tertiary stratigraphic palynology in Southeast Asia: current status and new directions

Morley¹

1991

BGSM

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Palynology is the only biostratigraphic technique which permits crossfacies correlation, and the only micropalaeontological method for correlation of non-marine sediments. Despite its wide use in Southeast Asia, there is currently very little published information which allows the geologist to assess independently the value of palynology for correlation and dating in this area. It is hoped that this contribution will help to fill this gap, as well as indicate the groundwork which is necessary in order to build up correlation schemes which will be of value in individual basins.Following a brief review of the history of palynological research in Southeast Asia, differences in approaches to correlation and dating of Tertiary sediments using palynology and other micropalaeontological disciplines are outlined. It is emphasised that in the Tertiary, the application of palynology is principally in correlation rather than dating; ages can often be applied to palynological zones only through independent dating using planktonic microfossils associated within transgressive sequences and distal marine facies.The resolution of palunological zonation schemes currently applicable to the Southeast Asian region and which are based on age restricted palynomorphs is then discussed. Many of the most important age index palynomorphs actually exhibit varying stratigraphic ranges across the region and these variations can often be explained in terms of tectonic, climatic and other controls. There is some scope for the determination of additional stratigraphic markers, especially in the Palaeogene, but high resolution schemes based on stratigraphically restricted form, if they can be established, will require a great deal of work.In order to provide palynological schemes of sufficient resolution to solve typical questions raised during petroleum exploration in Southeast Asia, an approach is required which gives greater resolution than is possible through reliance on age restricted palynomorphs alone. The methods and philosophy behind quantitative palynological zonation schemes are outlined and the stratigraphic resolution of quantitative and qualitative methods compared. Quantitative schemes can provide stratigraphic resolution comparable to that of planktonic marine microfossils, and greatly assist in the resolution of stratigraphic problems and search for hydrocarbons in non-marine, marginal marine and some marine depositional sequences.

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Section: Hopping Andmentioning

confidence: 99%

Tertiary stratigraphic palynology in Southeast Asia: current status and new directions

Morley¹

1991

BGSM

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“…• stratigraphy and reservoir/basin analysis (e.g. Rundberg and Smalley, 1989;Smalley et al, 1989Smalley et al, , 1992McArthur et al, 2012),…”

Section: Introductionmentioning

confidence: 99%

A strontium isoscape of northern Australia

Caritat

Dosseto

Dux

2023

Preprint

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Abstract. Strontium isotopes (87Sr / 86Sr) are useful in the Earth sciences as well as in forensic, archaeological, palaeontological, and ecological sciences. As very few large-scale Sr isoscapes exist in Australia, we have identified an opportunity to determine 87Sr / 86Sr ratios on archive fluvial sediment samples from the low-density National Geochemical Survey of Australia (www.ga.gov.au/ngsa; last access: 15 December 2022). The present study targeted the northern parts of Western Australia, the Northern Territory and Queensland, north of 21.5° S. The samples were taken mostly from a depth of ~60–80 cm in floodplain deposits at or near the outlet of large catchments (drainage basins). A coarse (< 2 mm) grain-size fraction was air-dried, sieved, milled then digested (hydrofluoric acid + nitric acid followed by aqua regia) to release total Sr. The Sr was then separated by chromatography and the 87Sr / 86Sr ratio determined by multicollector-inductively coupled plasma mass spectrometry. Preliminary results demonstrate a wide range of Sr isotopic values (0.7048 to 1.0330) over the survey area, reflecting a large diversity of source rock lithologies, geological processes and bedrock ages. Spatial distribution of 87Sr / 86Sr shows coherent (multi-point anomalies and smooth gradients), large-scale (> 100 km) patterns that appear to be broadly consistent with surface geology, regolith/soil type, and/or nearby outcropping bedrock. For instance, the extensive black clay soils of the Barkly Tableland define a > 500 km-long northwest-southeast-trending unradiogenic anomaly (87Sr / 86Sr < 0.7182). Where carbonate or mafic igneous rocks dominate, a low to moderate Sr isotope signature is observed. In proximity to the outcropping Proterozoic metamorphic basement of the Tennant, McArthur, Murphy and Mount Isa geological regions, conversely, radiogenic 87Sr / 86Sr values (> 0.7655) are observed. A potential correlation between mineralisation and elevated 87Sr / 86Sr values in these regions needs to be investigated in greater detail. Our results to-date indicate that incorporating soil/regolith Sr isotopes in regional, exploratory geoscience investigations can help identify basement rock types under (shallow) cover, constrain surface processes (e.g. weathering, dispersion), and, potentially, recognise components of mineral systems. Furthermore, the resulting Sr isoscape and future models derived therefrom can also be utilised in forensic, archaeological, paleontological and ecological studies that aim to investigate, e.g., past and modern animal (including humans) dietary habits and migrations. The new spatial Sr isotope dataset for the northern Australia region is publicly available (de Caritat et al., 2022a; https://dx.doi.org/10.26186/147473; last access: 15 December 2022).

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“…stratigraphy and reservoir/basin analysis (e.g. Rundberg and Smalley, 1989;Smalley et al, 1989Smalley et al, , 1992McArthur et al, 2012);…”

Section: Introductionmentioning

confidence: 99%

A strontium isoscape of northern Australia

Caritat

Dosseto

Dux

2023

Earth Syst. Sci. Data

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Abstract. Strontium isotopes (87Sr/86Sr) are useful to trace processes in the Earth sciences as well as in forensic, archaeological, palaeontological, and ecological sciences. As very few large-scale Sr isoscapes exist in Australia, we have identified an opportunity to determine 87Sr/86Sr ratios on archived fluvial sediment samples from the low-density National Geochemical Survey of Australia. The present study targeted the northern parts of Western Australia, the Northern Territory, and Queensland, north of 21.5∘ S. The samples were taken mostly from a depth of ∼60–80 cm in floodplain deposits at or near the outlet of large catchments (drainage basins). A coarse (<2 mm) grain-size fraction was air-dried, sieved, milled, and digested (hydrofluoric acid + nitric acid followed by aqua regia) to release total Sr. The Sr was then separated by chromatography, and the 87Sr/86Sr ratio was determined by multicollector inductively coupled plasma mass spectrometry. The results demonstrate a wide range of Sr isotopic values (0.7048 to 1.0330) over the survey area, reflecting a large diversity of source rock lithologies, geological processes, and bedrock ages. The spatial distribution of 87Sr/86Sr shows coherent (multi-point anomalies and smooth gradients), large-scale (>100 km) patterns that appear to be broadly consistent with surface geology, regolith/soil type, and/or nearby outcropping bedrock. For instance, the extensive black clay soils of the Barkly Tableland define a >500 km long northwest–southeast-trending unradiogenic anomaly (87Sr/86Sr <0.7182). Where sedimentary carbonate or mafic/ultramafic igneous rocks dominate, low to moderate 87Sr/86Sr values are generally recorded (medians of 0.7387 and 0.7422, respectively). Conversely, In proximity to the outcropping Proterozoic metamorphic basement of the Tennant, McArthur, Murphy, and Mount Isa geological regions, radiogenic 87Sr/86Sr values (>0.7655) are observed. A potential correlation between mineralization and elevated 87Sr/86Sr values in these regions needs to be investigated in greater detail. Our results to date indicate that incorporating soil/regolith Sr isotopes in regional, exploratory geoscience investigations can help identify basement rock types under (shallow) cover, constrain surface processes (e.g. weathering and dispersion), and, potentially, recognize components of mineral systems. Furthermore, the resulting Sr isoscape and future models derived therefrom can also be utilized in forensic, archaeological, palaeontological, and ecological studies that aim to investigate, for example, past and modern animal (including humans) dietary habits and migrations. The new spatial Sr isotope dataset for the northern Australia region is publicly available (de Caritat et al., 2022a; https://doi.org/10.26186/147473).

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Strontium-isotope stratigraphy: applications in basin modelling and reservoir correlation

Cited by 3 publications

References 27 publications

Tertiary stratigraphic palynology in Southeast Asia: current status and new directions

Tertiary stratigraphic palynology in Southeast Asia: current status and new directions

A strontium isoscape of northern Australia

A strontium isoscape of northern Australia

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