| Autor: |
Till CB; School of Earth & Space Exploration, Arizona State University, Tempe, AZ, USA. christy.till@asu.edu., Kent AJR; College of Earth, Ocean, & Atmospheric Sciences, Oregon State University, Corvallis, OR, USA., Abers GA; Department of Earth & Atmospheric Sciences, Cornell University, Ithaca, NY, USA., Janiszewski HA; Lamont Doherty Earth Observatory, Columbia University, New York, NY, USA.; DTM, Carnegie Institution for Science, Washington, DC, 20015, USA., Gaherty JB; Lamont Doherty Earth Observatory, Columbia University, New York, NY, USA., Pitcher BW; College of Earth, Ocean, & Atmospheric Sciences, Oregon State University, Corvallis, OR, USA.; Earth and Environmental Sciences, Vanderbilt University, Nashville, TN, 37240, USA. |
| Abstrakt: |
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 observed lava compositions to estimate the heat budget associated with Quaternary volcanism in the Cascades Arc and compare this to the heat required to produce the observed geophysical properties of the crust. Here we show that along-strike volcanic variability in the Quaternary Cascades Arc is primarily related to variations in the flux of basalt into the crust, rather than variations in their crustal storage history. This approach shows promise for studying other large-scale frontier geologic problems in volcanic arcs. |
