Incremental heating of Bishop Tuff sanidine reveals preeruptive radiogenic Ar and rapid remobilization from cold storage
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Abstract
Recent improvements in analytical and microsampling techniques for multiple geochronometers have resulted in datasets with unprecedented temporal and spatial resolution. These advances are accompanied by the discovery of crystal- and outcrop-scale complexities previously obscured by low analytical precision. Single-crystal incremental heating resolves subtle, intracrystal isotopic heterogeneity, allowing for more-accurate 40Ar/39Ar eruption ages. The eruption ages of widespread volcanic ash deposits are critical for calibrating the geologic timescale, and thus their accuracy has substantial implications for the geologic, biologic, and global climate records. Complex distribution of 40Ar/39Ar dates in the deposits of supervolcanic eruptions requires rethinking the magmatic processes and their effect on the 40Ar/39Ar system, specifically the extent of cooling and remobilization during the decades to centuries preceding these events.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Incremental heating of Bishop Tuff sanidine reveals preeruptive radiogenic Ar and rapid remobilization from cold storage |
| Series title | Proceedings of the National Academy of Sciences (PNAS) |
| DOI | 10.1073/pnas.1709581114 |
| Volume | 114 |
| Issue | 47 |
| Publication Date | November 07, 2017 |
| Year Published | 2017 |
| Language | English |
| Publisher | National Academy of Sciences (NAS) |
| Contributing office(s) | Volcano Science Center |
| Description | 6 p. |
| First page | 12407 |
| Last page | 12412 |
| Country | United States |
| State | California |
| Other Geospatial | Long Valley |