U-Pb detrital zircon data for: lower Paleozoic sedimentary rocks near Silverton, CO USA

Creators: Christopher S Holm-Denoma

Year: 2019

Location: Gunnison Basin, Colorado

Bounding box: 37.710°N to 37.710°N, -107.675°W to -107.675°W

Publisher: USGS

Tags: USGS Science Data Catalog (SDC), U.S. Geological Survey, USGS, Geology, Geophysics, and Geochemistry Science Center, GGG, Geochronology, Radiometric Dating, Laser-Ablation Inductively-Coupled Mass Spectrometry, LA-ICPMS, Microbeam Laboratory, SEM-cathodoluminescence, Detrital Zircon, Uranium-Lead, U-Pb, Thorium, Th, Stratigraphy, East Lime Creek Conglomerate, Ignacio Formation, Colorado, San Juan Mountains, Silverton, Sultan Creek, Geology & Tectonics, Geochemistry & Isotopes, Paleontology & Paleoecology, Geospatial Analysis, Gunnison Basin

Description

This Laser ablation ICPMS U-Pb detrital zircon data set supports mapping and stratigraphic interpretations of the Upper Devonian Ignacio Formation in southwestern Colorado (Silverton area). All samples were collected from a measured stratigraphic section called "Sultan Creek South" located at 37.710010 and -107.67530 (Evans and others, 2019). The Ignacio Formation was previously interpreted as Cambrian, but evidence that it is Devonian includes reexamined fossil data and detrital zircon U-Pb geochronology. The Ignacio Formation has a stratigraphic trend of detrital zircon ages shifting from a single ca. 1.7 Ga age peak to bimodal ca. 1.4 Ga and ca. 1.7 Ga age peaks, which represents local source-area unroofing history. Specifically, [...]

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