Zircon U-Pb Geochronology for West Susitna Bedrock Samples, Alaska

Ten bedrock samples collected during the 2024 field season provide zircon uranium-lead age data for a 500-square-mile region in southcentral Alaska. The Alaska Division of Geological & Geophysical Surveys produced this data using laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) to support a 1:50,000-scale geologic mapping project. These analyses aim to constrain bedrock unit ages and tectonic interpretations in an area of interest for resource development and recreation.

Use Cases

• Constraining the depositional ages of bedrock units based on zircon U-Pb dates.
• Supporting tectonic interpretations and geologic history models for the West Susitna region.
• Providing foundational geochronologic data for geologic hazard assessments mentioned in the project description.
• Informing resource development and land-use planning in the area of the proposed West Susitna Access Corridor.

Strengths

• Data covers a specific 500-square-mile study area across four USGS quadrangles.
• Analytical results are from a defined set of ten samples collected during a single 2024 field season.
• Data is tied to a specific 1:50,000-scale geologic mapping initiative with clear objectives.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• The dataset's raw, unprocessed nature may require expert interpretation for use.

Provenance

Source

Alaska Division of Geological & Geophysical Surveys (DGGS)

Collection Method

Samples collected in the field and analyzed using laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS).

Time Range

2024 field season

Freshness

Last updated 2026-03-08 03:04:19.126101; freshness should be verified.

Geography

West Susitna region, southcentral Alaska, spanning Tyonek C-3, C-4, D-4, and D-5 quadrangles.