Item talk:Q302852
From geokb
{
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"name": "Paleomagnetism of the Harrat Rahat volcanic field, Kingdom of Saudi Arabia\u2014Geologic unit correlations and geomagnetic cryptochron identifications",
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"url": "https://pubs.usgs.gov/publication/pp1862H"
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"value": "10.3133/pp1862H",
"url": "https://doi.org/10.3133/pp1862H"
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"datePublished": "2023",
"dateModified": "2024-01-02",
"abstract": "Paleomagnetic rock samples were collected from 173 drill sites in the Quaternary alkali basaltic volcanic field of northern Harrat Rahat, Kingdom of Saudi Arabia. Laboratory measurements on these samples established that lava flows and vent complexes\u2014identified and mapped from field characteristics, rock types, and compositions as products of single or temporally close eruptions\u2014typically record single, or very similar, directions of remanent magnetization. Correlations defined through geologic mapping, spatial association, geochemistry, geochronology, and identical mean remanent directions indicate at least 16 brief episodes of temporally clustered eruptions. These episodes had durations of a few centuries or less. Anomalous remanent magnetic directions were found for at least 13 mapped lavas of northern Harrat Rahat, which demonstrate that they were acquired during brief geomagnetic cryptochrons during the Brunhes Normal Polarity Chron. These uncharacteristic directions enhance the opportunity to identify common eruptive episodes, and to better understand and evaluate assessments of eruption ages based on 40Ar/39Ar geochronology. Combining paleomagnetic and regional archaeomagnetic results for the youngest eruptions allows us to evaluate their historical age assignments and, in one case, refute a previously assigned provisional age.",
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"name": "U.S. Geological Survey"
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"name": "Champion, Duane E. dchamp@usgs.gov",
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"name": "Volcano Science Center",
"url": "https://www.usgs.gov/centers/volcano-science-center"
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"name": "Shawali, Jamal",
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"name": "Saudi Geological Survey"
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"name": "Sisson, Thomas W. tsisson@usgs.gov",
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"name": "Hassan, Khalid",
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