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31 results on '"Ukstins, Ingrid A."'

3. Complex decompression and fragmentation of mingled andesite magmas driving multi-phase Plinian eruptions at Mt. Taranaki, New Zealand

Author

Torres-Orozco, Rafael, Cronin, Shane J., Pardo, Natalia, Kosik, Szabolcs, Ukstins, Ingrid, Heinrich, Mirja, Lee, Peter D., Torres-Orozco, Rafael, Cronin, Shane J., Pardo, Natalia, Kosik, Szabolcs, Ukstins, Ingrid, Heinrich, Mirja, and Lee, Peter D.

Abstract

Highlights • Plinian eruptions linked to rheologically different mingling andesite magmas. • Magma decompression regimes producing variable degassing/crystallization kinetics. • Least explosive eruptions at slowest decompression, ascent and strain rates. • Plinian phases at rapid/intermittent magma decompression, ascent and strain rates. Abstract Estimating the kinetics of andesite magma vesiculation and crystallization inside volcanic plumbing systems is key for unraveling andesite Plinian eruption dynamics. The conduit kinetics provide the necessary input data for estimating the magma flow rates driving magma ascent and the fragmentation mechanisms controlling shifts in eruption explosivity and style. This information is crucial for increasing knowledge on expected hazards and for developing realistic eruption scenarios. In this work, we estimate conduit magma vesiculation and crystallization kinetics during the 3300 cal BP Upper Inglewood Plinian eruptive episode of Mount Taranaki, New Zealand. This episode comprised (i) low-intensity, conduit-opening phases of dome-collapse PDCs; (ii) pre-climactic, highly explosive phases of diverse PDCs, of up to violent 18-km-runout lateral blasts; (iii) climactic phases of steady 22-km-high Plinian eruption columns; and (iv) waning phases of column-collapse PDCs. By employing synchrotron microtomography, combined with mineral/glass chemistry and electron-microscopy, we quantified 3D vesicle and crystal size and shape distributions in juvenile pyroclasts over time, and corresponding number densities ranging from 1.1 × 105 to 2.5 × 106 mm−3 for vesicles, and from 8.0 × 104 to 5.1 × 106 mm−3 for crystals. Our results indicate that tapping of chemically alike yet rheologically contrasting magmas over a multi-phase andesite eruptive episode is linked to: (a) mafic magma recharge and differentiation in multiple storage reservoirs at distinct crustal levels, (b) stepwise to rapid magma decompression while mingling, producing variab

Published
2023
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4. Ukstins Peate et al 2010 LPSC.pdf

Author

Ukstins, Ingrid

Abstract

A novel application of (U-Th)/He geochronology to constrain the age of small, young meteorite impact craters: A case study of the Monturaqui Crater, Chile.

Published
2023
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5. Rathbun et al 2016 LPSC 2583.pdf

Author

Ukstins, Ingrid

Abstract

A new geologic map of Monturaqui meteorite impact crater, Chile: Implications for satellite-based geologic mapping of small craters.

Published
2023
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6. Byram et al 2009 LPSC.pdf

Author

Ukstins, Ingrid

Abstract

U-Th geochronological constraints on paleolake levels and climate change recorded in carbonate sedimentation at Laguna Lejia, Northern Chile.

Published
2023
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8. Piatek et al 2010 LPSC.pdf

Author

Ukstins, Ingrid

Abstract

Monturaqui Crater (Atacama Desert, Chile) as a Mars analog: Exploring the impact spherule hypothesis for Meridiani.

Published
2023
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9. Cabrol et al 2009 LPSC.pdf

Author

Ukstins, Ingrid

Abstract

High Lakes Project – Impact of climate variability and high UV flux on lake habitat: Implications for early Mars and present-day Earth

Published
2023
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18. The geological history and hazards of a long-lived stratovolcano, Mt. Taranaki, New Zealand

Author

Cronin, Shane J., Zernack, Anke V., Ukstins, Ingrid A., Turner, Michael B., Torres-Orozco, Rafael, Stewart, Robert B., Smith, Ian E. M., Procter, Jonathan N., Price, Richard, Platz, Thomas, Petterson, Michael, Neall, Vince E., McDonald, Garry S., Lerner, Geoffrey A., Damaschke, Magret, Bebbington, Mark S., Cronin, Shane J., Zernack, Anke V., Ukstins, Ingrid A., Turner, Michael B., Torres-Orozco, Rafael, Stewart, Robert B., Smith, Ian E. M., Procter, Jonathan N., Price, Richard, Platz, Thomas, Petterson, Michael, Neall, Vince E., McDonald, Garry S., Lerner, Geoffrey A., Damaschke, Magret, and Bebbington, Mark S.

Abstract

Mt. Taranaki is an andesitic stratovolcano in the western North Island of New Zealand. Its magmas show slab-dehydration signatures and over the last 200 kyr they show gradually increasing incompatible element concentrations. Source basaltic melts from the upper mantle lithosphere pond at the base of the crust (∼25 km), interacting with other stalled melts rich in amphibole. Evolved hydrous magmas rise and pause in the mid crust (14–6 km), before taking separate pathways to eruption. Over 228 tephras erupted over the last 30 kyr display a 1000–1500 yr-periodic cycle with a five-fold variation in eruption frequency. Magmatic supply and/or tectonic regime could control this rate-variability. The volcano has collapsed and re-grown 16 times, producing large (2 to >7.5 km3) debris avalanches. Magma intrusion along N-S striking faults below the edifice are the most likely trigger for its failure. The largest Mt. Taranaki Plinian eruption columns reach ∼27 km high, dispersing 0.1 to 0.6 km3 falls throughout the North Island. Smaller explosive eruptions, or dome-growth and collapse episodes were more frequent. Block-and-ash flows reached up to 13 km from the vent, while the largest pumice pyroclastic density currents travelled >23 km. Mt. Taranaki last erupted in AD1790 and the present annual probability of eruption is 1–1.3%.

Published
2021

20. The Importance of Field Studies for Closing Key Knowledge Gaps in Planetary Science

Author

Whelley, Patrick, primary, Achilles, Cherie N., additional, Baldridge, Alice M., additional, Banks, Maria E., additional, Bell, Ernest, additional, Bernhardt, Hannes, additional, Bishop, Janice, additional, Blank, Jennifer G., additional, Bower, Dina M., additional, Byrne, Shane, additional, Clark, Jaclyn, additional, Crown, David A., additional, Crumpler, Larry S., additional, Czarnecki, Sean, additional, Davies, Ashly, additional, Wet, Andrew de, additional, Dean, Jake W., additional, Dibb, Steven, additional, Dong, Chuanfei, additional, Edgar, Lauren A., additional, Fagents, Sarah, additional, Glotch, Timothy D., additional, Goudge, Timothy A., additional, Graettinger, Alison H., additional, Graff, Trevor G., additional, Gullikson, Amber L., additional, Hamilton, Christopher W., additional, Honniball, Casey I., additional, Hubbard, Kevin, additional, Kerber, Laura, additional, Kestay, Laszlo, additional, Kobs-Nawotniak, Shannon, additional, Lane, Melissa D., additional, Lau, Graham, additional, Law, Emily, additional, Lev, Einat, additional, Matiella-Novak, Alexandra, additional, McAdam, Amy, additional, Moersch, Jeffrey E., additional, Neish, Catherine, additional, Osinski, Gordon, additional, Parekh, Rutu, additional, Paris, Kristen, additional, Patrick, Edward L., additional, Rampe, Elizabeth, additional, Richardson, Jacob, additional, Romo, Rodrigo, additional, Rumpf, M. Elise, additional, Runyon, Kirby, additional, Rutledge, Alicia M., additional, Scheidt, Stephen P., additional, Schmerr, Nicholas, additional, Semken, Steven, additional, Shiro, Brian, additional, Shock, Everett L., additional, Skok, John Roma, additional, Sutton, Sarah S., additional, Swann, Jessica, additional, Thorpe, Michael T., additional, Ukstins, Ingrid A., additional, Susante, Paul J. van, additional, Whelley, Nicole, additional, Williams, David A., additional, Yingst, R. Aileen, additional, Young, Kelsey, additional, Zaloumis, Jon, additional, and Zimbelman, James R., additional

Published
2021
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21. The geological history and hazards of a long-lived stratovolcano, Mt. Taranaki, New Zealand

Author

Cronin, Shane J., primary, Zernack, Anke V., additional, Ukstins, Ingrid A., additional, Turner, Michael B., additional, Torres-Orozco, Rafael, additional, Stewart, Robert B., additional, Smith, Ian E. M., additional, Procter, Jonathan N., additional, Price, Richard, additional, Platz, Thomas, additional, Petterson, Michael, additional, Neall, Vince E., additional, McDonald, Garry S., additional, Lerner, Geoffrey A., additional, Damaschcke, Magret, additional, and Bebbington, Mark S., additional

Published
2021
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31. What triggered the early-stage eruption of the Emeishan large igneous province?

Author

Bei Zhu, Zhaojie Guo, Shaonan Zhang, Ukstins, Ingrid, Wei Du, and Runchao Liu

Subjects
*IGNEOUS provinces, *MANTLE plumes, *PLATE tectonics, *VOLCANIC ash, tuff, etc., *GEOCHEMISTRY, *SUBDUCTION
Abstract

The formation of the Emeishan large igneous province is widely regarded as being related to a mantle plume, but plate tectonics may also have played an important role. We analyzed the regional facies architecture of the early-stage subaqueous volcanic rocks of the central Emeishan large igneous province. The results suggest that these rocks were emplaced in a N-S-striking subaqueous rift, which existed immediately before the onset of volcanism and was persistently maintained during the early eruption stage. By linking this conclusion with the background information indicating that (1) the basaltic geochemistry in this section is indicative of a subcontinental lithospheric mantle source rather than a mantle plume source, and (2) the western Yangtze plate, where the Emeishan large igneous province was developed, was located in the back-arc region of the Permian Paleo-Tethys subduction system, we propose a new view that the early-stage eruptions of the Emeishan large igneous province were triggered by back-arc extension. The dominant functioning of the mantle plume occurred shortly after this process and inherited it, as evidenced by the following: (1) The subaqueous volcanic architecture showing back-arc geochemical affinity is laterally restricted in the presumed rift, but the overlying subaerial lavas showing plumerelated geochemical features overwhelmingly flooded the whole province; (2) vertically, the source of the basaltic component in these intrarift sequences underwent a gradual transition from lithospheric origin to mantle plume origin along the stratigraphic order, as evidenced by an intercalated basaltic succession showing mixed geochemical features from the two contextual origins. [ABSTRACT FROM AUTHOR]

Published
2019
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