U-Pb zircon data for Cenozoic clastic and volcaniclastic units deformed along the Gales Creek Fault zone, northwestern Oregon
This data release includes laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) U-Pb zircon geochronology data from four samples collected from fault-bounded bedrock units in northwestern Oregon. Samples were collected from a paleoseismic trench excavated across the Scoggins Valley strand of the Gales Creek Fault and nearby quarry. The trench is located on a ridge top saddle on the Scoggins Creek-Tualatin River divide, where it crosses a lidar scarp trending 300°, up to the east, with suggestion of dextral slip. Trench trends 060° across scarp, is 35 m long in bedrock. Loess, paleosols, and colluvium overlie bedrock. The trench exposes tuffaceous sediments of the Keasey Formation, which records initial deposition of Cascade-derived sediment into the forearc basins from the newly formed Cascade arc. Three samples were collected in the trench from the tuffaceous mudstone of the Keasey Formation; the basaltic sandstone in the Stimson Mill member of the Keasey Formation, and a lithic sandstone bed in the Keasey Formation, respectively. One sample was collected from a quarry near the paleoseismic trench, in a 13m-thick, indurated silicic tuff bed of the Keasey Formation, which may correlate with one of the large, dated ash flow tuffs recognized in the Cascade arc and backarc between ~41 and 25 Ma. The sequence is capped with modern gray loess-derived soil of variable thickness. Ages of samples WN17-1, -2, and -7 overlap, and all have a large tuffaceous component from the initiation of Cascade arc volcanism. Sample WN17-6 has a slightly older detrital age spectra and is a dark brown weathered lithic (basaltic) sandstone, distinct from the three other light colored tuffaceous rocks. The tuff bed (sample WN17-7) is a local marker bed in the basaltic sandstone. The older age for the basaltic sandstone may reflect a separate Coast Range source. The data supports the geologic map of Scoggins Dam, Henry Hagg Lake, and the Scoggins Valley area, Washington County, Oregon.
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Complete Metadata
| @type | dcat:Dataset |
|---|---|
| accessLevel | public |
| bureauCode |
[ "010:12" ] |
| contactPoint |
{ "fn": "Laura S. Pianowski", "@type": "vcard:Contact", "hasEmail": "mailto:lpianowski@usgs.gov" } |
| description | This data release includes laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) U-Pb zircon geochronology data from four samples collected from fault-bounded bedrock units in northwestern Oregon. Samples were collected from a paleoseismic trench excavated across the Scoggins Valley strand of the Gales Creek Fault and nearby quarry. The trench is located on a ridge top saddle on the Scoggins Creek-Tualatin River divide, where it crosses a lidar scarp trending 300°, up to the east, with suggestion of dextral slip. Trench trends 060° across scarp, is 35 m long in bedrock. Loess, paleosols, and colluvium overlie bedrock. The trench exposes tuffaceous sediments of the Keasey Formation, which records initial deposition of Cascade-derived sediment into the forearc basins from the newly formed Cascade arc. Three samples were collected in the trench from the tuffaceous mudstone of the Keasey Formation; the basaltic sandstone in the Stimson Mill member of the Keasey Formation, and a lithic sandstone bed in the Keasey Formation, respectively. One sample was collected from a quarry near the paleoseismic trench, in a 13m-thick, indurated silicic tuff bed of the Keasey Formation, which may correlate with one of the large, dated ash flow tuffs recognized in the Cascade arc and backarc between ~41 and 25 Ma. The sequence is capped with modern gray loess-derived soil of variable thickness. Ages of samples WN17-1, -2, and -7 overlap, and all have a large tuffaceous component from the initiation of Cascade arc volcanism. Sample WN17-6 has a slightly older detrital age spectra and is a dark brown weathered lithic (basaltic) sandstone, distinct from the three other light colored tuffaceous rocks. The tuff bed (sample WN17-7) is a local marker bed in the basaltic sandstone. The older age for the basaltic sandstone may reflect a separate Coast Range source. The data supports the geologic map of Scoggins Dam, Henry Hagg Lake, and the Scoggins Valley area, Washington County, Oregon. |
| distribution |
[ { "@type": "dcat:Distribution", "title": "Digital Data", "format": "XML", "accessURL": "https://doi.org/10.5066/P91ZSKV3", "mediaType": "application/http", "description": "Landing page for access to the data" }, { "@type": "dcat:Distribution", "title": "Original Metadata", "format": "XML", "mediaType": "text/xml", "description": "The metadata original format", "downloadURL": "https://data.usgs.gov/datacatalog/metadata/USGS.622b9481d34ec9f19eea431b.xml" } ] |
| identifier | http://datainventory.doi.gov/id/dataset/USGS_622b9481d34ec9f19eea431b |
| keyword |
[ "Detrital Zircon", "GGGSC", "Gales Creek", "Geochronology", "Geology, Geophysics, and Geochemistry Science Center", "LA-ICPMS", "Laser-Ablation Inductively-Coupled Plasma Mass Spectrometry", "MRP", "Microbeam Laboratory", "Mineral Resources Program", "Oregon", "Radiometric Dating", "SEM-cathodoluminescence", "Scoggins Creek", "Scoggins Valley", "Sedimentary Rocks", "Thorium", "Tualatin River", "U-Pb", "U.S. Geological Survey", "USGS", "USGS:622b9481d34ec9f19eea431b", "Uranium", "Uranium-Lead analysis" ] |
| modified | 2023-04-04T00:00:00Z |
| publisher |
{ "name": "U.S. Geological Survey", "@type": "org:Organization" } |
| spatial | -123.1797, 45.4539, -123.1651, 45.4728 |
| theme |
[ "geospatial" ] |
| title | U-Pb zircon data for Cenozoic clastic and volcaniclastic units deformed along the Gales Creek Fault zone, northwestern Oregon |
