U-Pb detrital zircon data for: lower Paleozoic sedimentary rocks near Silverton, CO USA
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, the upper plate of a Proterozoic thrust system (ca. 1.7 Ga Twilight Gneiss) was eroded prior to exposure of the lower plate (ca. 1.4 Ga Uncompahgre Formation). These results are a significant alternative interpretation of the geologic history of the southern Rocky Mountains.
Resources
| Name |
Format |
Description |
Link |
|
55 |
The metadata original format |
https://data.usgs.gov/datacatalog/metadata/USGS.5d44aa89e4b01d82ce8dbe15.xml |
|
55 |
Landing page for access to the data |
https://doi.org/10.5066/P9SYHGUV |
Tags
- ggg
- east-lime-creek-conglomerate
- colorado
- geology-geophysics-and-geochemistry-science-center
- geochronology
- microbeam-laboratory
- laser-ablation-inductively-coupled-mass-spectrometry
- san-juan-mountains
- stratigraphy
- th
- u-s-geological-survey
- thorium
- usgs-5d44aa89e4b01d82ce8dbe15
- ignacio-formation
- la-icpms
- sem-cathodoluminescence
- u-pb
- radiometric-dating
- silverton
- usgs
- sultan-creek
- detrital-zircon
- uranium-lead