Makushin-Stations: Stratigraphic section and sample station ID numbers, coordinates, and location descriptions. Makushin-Samples: Sample ID numbers with station ID, source volcano, sample type, and description. Makushin-Layers: Stratigraphic section layer data from each project year. Makushin-EPMA: Single-point EPMA analyses including sample ID, session date, MethodID, analytical group, point number, and glass populations. Makushin-Analytical-Conditions: Analytical conditions, MethodID, calibration standards, detector, crystal, and count times. Makushin-Standards: Working standard data in single analytical point format.
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Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Matt Loewen provided ample assistance with the stratigraphic section data sheets. Michelle Coombs assisted with correlating Nateekin electron microprobe data with the Akutan source eruption. We thank the U.S. Fish and Wildlife Service and the Ounalashka Corporation for permission to conduct this fieldwork on their lands and for their generous assistance with many aspects of our fieldwork and engagement with the Unalaska community. Maritime Helicopters and Pathfinder Aviation supported this work, and we thank their pilots for safe and successful field seasons.
This dataset contains LA-ICP-MS U-Pb zircon ages and trace and rare-earth element data from 14 igneous and metaigneous samples collected for the USGS Earth MRI Steese and Chena mapping projects. These data support efforts to modernize geologic mapping in regions with critical mineral potential across the Yukon-Tanana Upland. The purpose of the dataset is to constrain the timing of igneous activity to inform geologic mapping, tectonic interpretations, and mineralization studies in east-central Alaska.
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Are there legal restrictions on access or use of the data?Access_Constraints:
This report, map, and/or dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).Use_Constraints:Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.
The State of Alaska makes no expressed or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.
| Data format: | table in format spreadsheet |
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https://doi.org/10.14509/32059 |