Christy B. Till
Arizona State University
Publications 57
#1Christy B. Till (ASU: Arizona State University)H-Index: 13
#2Adam J. R. Kent (OSU: Oregon State University)H-Index: 36
Last.B. W. Pitcher (OSU: Oregon State University)H-Index: 1
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Decades of study on volcanic arcs have provided insight into the overarching processes that control magmatism, and how these processes manifest at individual volcanoes. However, the causes of ubiquitous and dramatic intra-arc variations in volcanic flux and composition remain largely unresolved. Investigating such arc-scale issues requires greater quantitative comparison of geophysical and geochemical data, linked through sets of common intensive variables. To work towards these goals, we use ob...
2 CitationsSource
#1Timothy L. Grove (MIT: Massachusetts Institute of Technology)H-Index: 71
#2Christy B. Till (ASU: Arizona State University)H-Index: 13
To investigate the first melts of the mantle wedge in subduction zones and their relationship to primitive magmas erupted at arcs, the compositions of low degree melts of hydrous garnet lherzolite have been experimentally determined at 3.2 GPa over the temperature range of 925–1150 °C. Two starting compositions with variable H2O contents were studied; a subduction-enriched peridotite containing 0.61% Na2O, 0.16 K2O% (wt%) with 4.2 wt% H2O added (Mitchell and Grove in Contrib Mineral Petrol 170:1...
#1Christy B. Till (ASU: Arizona State University)H-Index: 13
#2Jorge A. Vazquez (USGS: United States Geological Survey)H-Index: 16
Last.Jamie S. Shaffer (NMSU: New Mexico State University)
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#1Karalee K. Brugman (ASU: Arizona State University)H-Index: 1
#2Christy B. Till (ASU: Arizona State University)H-Index: 13
#1M. A. Edwards (UCSB: University of California, Santa Barbara)
#2Matthew G. Jackson (UCSB: University of California, Santa Barbara)H-Index: 34
Last.Frank J. Spera (UCSB: University of California, Santa Barbara)H-Index: 39
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Abstract We report the major-element, trace-element, and 87Sr/86Sr compositions of six plagioclase crystals from two Samoan lavas with extreme EM2 isotopic compositions (ALIA-115-18 with whole-rock 87Sr/86Sr of 0.718592, and ALIA-115-21 with whole-rock 87Sr/86Sr of 0.720469). We employed laser-ablation split-stream mass spectrometry (LASS) to simultaneously measure 87Sr/86Sr ratios, major-element concentrations, and trace-element concentrations in the same plagioclase crystal volume. We find tha...
#1Hannah I. Shamloo (ASU: Arizona State University)H-Index: 1
#2Christy B. Till (ASU: Arizona State University)H-Index: 13
The magmatic processes responsible for triggering nature’s most destructive eruptions and their associated timescales remain poorly understood. Yellowstone Caldera is a large silicic volcanic system that has had three supereruptions in its 2.1-Ma history, the most recent of which produced the Lava Creek Tuff (LCT) ca. 631 ka. Here we present a petrologic study of the phenocrysts, specifically feldspar and quartz, in LCT ash in order to investigate the timing and potential trigger leading to the ...
6 CitationsSource
#1Adam J. R. KentH-Index: 36
#2Christy B. TillH-Index: 13
Last.Kari M. CooperH-Index: 24
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#1Christy B. Till (ASU: Arizona State University)H-Index: 13
#2Matthew E. Pritchard (Cornell University)H-Index: 29
Last.Juliet Ryan-Davis (USGS: United States Geological Survey)H-Index: 1
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Multi-disciplinary analyses of Earth’s most destructive volcanic systems show that continuous monitoring and an understanding of each volcano’s quirks, rather than a single unified model, are key to generating accurate hazard assessments.
1 CitationsSource
#1Christy B. Till (ASU: Arizona State University)H-Index: 13