Correlation of Indian Ocean tephra to individual Oligocene silicic eruptions from Afro-Arabian flood volcanism

Ukstins, Ingrid; Baker, Joel A.; Kent, Adam J.R.; Al-Kadasi, Mohamed; Al-Subbary, Abdulkarim; Ayalew, Dereje; Menzies, Martin

doi:10.1016/s0012-821x(03)00192-4

Cited by 57 publications

(32 citation statements)

References 46 publications

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“…A similar approach was adopted by Bryant et al (1999) who distinguished the products of the geographically close Izu-Bonin and Mariana arcs using differences in the trace element ratios of glass shards from tephra deposits. Ukstins-Peate et al (2003) produced trace element and Pb-isotopic data from individual glass shards from tephras from the Indian Ocean, using both a quadrupole and a high-resolution multi-collector ICP-MS and a 266 nm laser, correlating a series of tephra deposits from ODP core 711A (in the Indian Ocean) to large eruptions from the Afro-Arabian flood volcanic province. Harangi et al (2005) have, most recently, determined the trace elements in glass shards using an Excimer laser from a series of eastern and central European tephras to enable correlations and place constraints on the petrogenesis of the volcanics.…”

Section: Single Grain Analysis-instrumental and Methods Modificationsmentioning

confidence: 99%

“…Furthermore, analysis of glass compositional data of this type, when combined with mineral major and trace element compositions from tephra deposits, can be used to place constraints on the petrogenesis of a particular tephra or group of tephras and to enable distinctions of sources, with geochemically coherent suites likely to be sourced from one vent/ magmatic system. This distinction between sources is clear in the glass data from Yiali, Kos and Santorini (Hart, 2005) and this petrogenetic approach has been applied elsewhere to constrain sources and magmatic evolution (Bryant et al, 1999;Ukstins-Peate et al, 2003;Harangi et al, 2005). Alloway et al (2004) recently described a series of tephra deposits recovered from peat cores and coastal and inland section in the Auckland region, New Zealand.…”

Section: Applicationsmentioning

confidence: 99%

“…High-resolution instruments, particularly multi-collector instruments, may also be useful in some isotopic studies on single glass shards when coupled to a laser (e.g. Ukstins-Peate et al, 2003). While these applications are firmly rooted in petrogenetic studies, a better understanding of the origins of particular tephra deposits can provide a more secure identity for a deposit and be of great value in defining source regions, thus assisting greatly in correlation studies.…”

Section: Advances In Icp-ms Instrumentationmentioning

confidence: 99%

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Correlation and characterisation of individual glass shards from tephra deposits using trace element laser ablation ICP‐MS analyses: current status and future potential

Pearce

Denton

Perkins

et al. 2007

J Quaternary Science

100

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Pearce, Nicholas, Denton, J.S., Perkins, W.T., Westgate, J.A., (2007) 'Correlation and characterisation of individual glass shards from tephra deposits using trace element laser ablation ICP-MS analyses: current status and future potential', Journal of Quaternary Science 22(7) pp.721-736 RAE2008Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) is a high spatial resolution analytical method which has been applied to the analysis of silicic tephras. With current instrumentation, around 30 trace elements can be determined from single glass shards as small as 40 ?m, separated from tephra deposits. As a result of element fractionation during the ablation process using a 266 nm laser, a relatively complex calibration strategy is required. Nonetheless, such a strategy gives analyses which are accurate (typically within ?5%) and have an analytical precision which varies from ?2% at 100 ppm, to ?15% at 1 ppm. Detection limits for elements used in correlation and discrimination studies are well below 1 ppm. Examples of the application of trace element analysis by LA-ICP-MS in tephra studies are presented from the USA, New Zealand and the Mediterranean. Improvements in instrumental sensitivity in recent years have the potential to lower detection limits and improve analytical precision, thus allowing the analysis of smaller glass shards from more distal tephras. Laser systems operating at shorter wavelengths (e.g. 193 nm) are now more widely available, and produce a much more controllable ablation in glasses than 266 nm lasers. Crater sizes ofPeer reviewe

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Section: Single Grain Analysis-instrumental and Methods Modificationsmentioning

confidence: 99%

Section: Applicationsmentioning

confidence: 99%

Section: Advances In Icp-ms Instrumentationmentioning

confidence: 99%

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Correlation and characterisation of individual glass shards from tephra deposits using trace element laser ablation ICP‐MS analyses: current status and future potential

Pearce

Denton

Perkins

et al. 2007

J Quaternary Science

100

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“…Current work in the field of large igneous provinces and climate change is beginning to suggest that while silicic pyroclastic eruptions are large-volume and highly explosive, they do not necessarily have a significant, long-term climate impact (e.g., Ukstins Peate et al, 2003b). However, highly explosive mafic volcaniclastic eruptions, with associated high volatile contents (CO 2 , Cl, F, sulphur species), may provide the answer to the apparent mis-match observed between climate change events and silicic eruptions in large igneous provinces, as observed in the Yemen-Ethiopian flood basalt province, where silicic volcanism post-dates any observable climate fluctuations, but the initiation of mafic flood volcanism may provide a closer link (Ukstins Peate et al, 2003, in press).…”

Section: -Summary and Conclusionmentioning

confidence: 99%

Mafic volcaniclastic deposits in flood basalt provinces: A review

Ross

Ukstins

McClintock

et al. 2005

Journal of Volcanology and Geothermal Research

137

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Flood volcanic provinces are assumed generally to consist exclusively of thick lavas and shallow intrusive rocks (mostly sills), with any pyroclastic rocks limited to silicic compositions. However mafic volcaniclastic deposits (MVDs) exist in many provinces, and the eruptions that formed such deposits are potentially meaningful in terms of potential atmospheric impacts and links with mass extinctions. The province where MVDs are the most voluminousthe Siberian Traps -is also the one temporally associated with the greatest Phanerozoic mass extinction. A lot remains to be learned about these deposits and eruptions before a convincing genetic link can be established, but as a first step, this contribution reviews in some detail the current knowledge on MVDs for the provinces in which they are better known, i.e. the North Atlantic Igneous Province (including Greenland, the Faeroe Islands, the British Isles, and tephra layers in the North Sea basin and vicinity), the Ontong Java plateau, the Ferrar, and the Karoo. We also provide a brief overview of what is known about MVDs in other provinces such as the Columbia River Basalts, the Afro-Arabian province, the Deccan Traps, the Siberian Traps, the Emeishan, and an Archean example from Australia. The thickest accumulations of MVDs occur in flood basalt provinces where they underlie the lava pile (Faeroes: >1 km, Ferrar province: ≥400 m, Siberian Traps: 700 m). In the Faeroes case, the great thickness of MVDs can be attributed to accumulation in a local sedimentary basin, but in the Ferrar and Siberian provinces the deposits are widespread (>3 x 10 5 km 2 for the latter). On the Ontong Java plateau over 300 m of MVDs occur in one drill hole without any overlying lavas. Where the volcaniclastic deposits are sandwiched between lavas, their thickness is much less. In most of the cases reviewed, primary MVDs are predominantly of phreatomagmatic origin, as indicated by the clast assemblage generally consisting of basaltic clasts of variable vesicularity (dominantly non-to poorly-vesicular) mixed with abundant country rock debris. The accidental lithic components often include loose quartz particles derived from poorly consolidated sandstones in underlying sedimentary basins (East Greenland, Ferrar, Karoo). These underlying sediments or sedimentary rocks were not only a source for debris but also aquifers that supplied water to fuel phreatomagmatic activity. In the Paraná-Etendeka, by contrast, the climate was apparently very dry when the lavas were emplaced (aeolian sand dunes) and no MVDs are reported. Volcanic vents filled with mafic volcaniclastic material, a few tens of metres to about 5 km across, are documented in several provinces (Deccan, North Atlantic, Ferrar, Karoo); they are though to have been excavated in relatively soft country rocks (rarely in flood lavas) by phreatomagmatic activity in a manner analogous to diatreme formation.

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“…Mathez and Waight (2003) analyzed plagioclase-sulfide pairs from the Bushveld Complex by LA-MC-ICPMS, and successfully demonstrated that in situ Pb analyses may be used to gain insights into the complex magmatic and subsolidus history of a large layered intrusion. Ukstins-Peate et al (2003) used LA-MC-ICPMS analyses of K-feldspar and glass shards to correlate individual ignimbrites in the Red Sea region to ash falls in the Indian Ocean.…”

Section: Introductionmentioning

confidence: 99%

Pb isotopic zoning of K-feldspar megacrysts determined by Laser Ablation Multi-Collector ICP-MS: Insights into granite petrogenesis

Gagnevin

Daly

Waight³

et al. 2005

Geochimica et Cosmochimica Acta

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Correlation of Indian Ocean tephra to individual Oligocene silicic eruptions from Afro-Arabian flood volcanism

Cited by 57 publications

References 46 publications

Correlation and characterisation of individual glass shards from tephra deposits using trace element laser ablation ICP‐MS analyses: current status and future potential

Correlation and characterisation of individual glass shards from tephra deposits using trace element laser ablation ICP‐MS analyses: current status and future potential

Mafic volcaniclastic deposits in flood basalt provinces: A review

Pb isotopic zoning of K-feldspar megacrysts determined by Laser Ablation Multi-Collector ICP-MS: Insights into granite petrogenesis

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