data: Analytical lab data and accompanying data dictionary sample-summary: Summary data spreadsheet and accompanying data dictionary
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We thank Nathan Graham for his assistance at the University of Alaska Fairbanks Advanced Instrumentation Laboratory. The DGGS Chena and Steese projects are funded by the State of Alaska and the U.S. Geological Survey's (USGS) Earth Mapping Resources Initiative (Earth MRI) program under Cooperative Agreement numbers G24AC00323 and G23AC00372. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the opinions or policies of the USGS. Mention of trade names or commercial products does not constitute their endorsement by the USGS.
To advance geological research in interior Alaska, we conducted electron probe microanalyzer (EPMA) analyses to obtain detailed geochemical data from individual mineral phases within selected rock samples. These data supported five principal objectives: (1) characterizing ultramafic rocks from the Seventymile Terrane and comparing them with lithologies of uncertain origin in adjacent Earth MRI areas; (2) clarifying the metamorphic identity of eclogitic and amphibolite-like rocks within the Chatanika assemblage; (3) analyzing mineral compositions to distinguish among diverse amphibolite units; (4) estimating pressure-temperature conditions to evaluate contrasts between assemblages; and (5) resolving ambiguities surrounding mafic phases associated with the Roy Creek intrusion. Collectively, this work contributes to a broader understanding of lithologic variability, metamorphic evolution, and geochemical diversity across the Yukon-Tanana Uplands.
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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/10.14509/31537 |