Reconstruction of a Late Proterozoic to Devonian Continental Margin Sequence, Northern Alaska, Its Paleogeographic Significance, and Contained Base-Metal Sulfide Deposits

Age, chemistry, and correlations of Neoproterozoic–Devonian igneous rocks of the Arctic Alaska–Chukotka terrane: An overview with new U-Pb ages
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Published:July 01, 2014
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Jeffrey M. Amato, John N. Aleinikoff, Vyacheslav V. Akinin, William C. McClelland, Jaime Toro, 2014. "Age, chemistry, and correlations of Neoproterozoic–Devonian igneous rocks of the Arctic Alaska–Chukotka terrane: An overview with new U-Pb ages", Reconstruction of a Late Proterozoic to Devonian Continental Margin Sequence, Northern Alaska, Its Paleogeographic Significance, and Contained Base-Metal Sulfide Deposits, Julie A. Dumoulin, Alison B. Till
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The Arctic Alaska–Chukotka terrane is a microcontinent with an origin exotic to Laurentia. We used a sensitive high-resolution ion microprobe (SHRIMP) to date nine samples of Neoproterozoic rock and five samples of Devonian rock from the Brooks Range and Seward Peninsula of Alaska and from the Chukotka Peninsula of northeastern Russia. Felsic magmatism occurred at 968 Ma and 742 Ma in the Brooks Range and at 865 Ma and 670–666 Ma on Seward Peninsula. Felsic igneous rocks in Chukotka were dated at 656 Ma and 574 Ma. Devonian igneous rocks are found throughout the Arctic Alaska–Chukotka terrane, and we dated...
- absolute age
- Alaska
- alkaline earth metals
- Asia
- Brooks Range
- Chukchi Peninsula
- Commonwealth of Independent States
- dates
- Devonian
- geochemistry
- igneous rocks
- isotope ratios
- isotopes
- magmatism
- metaigneous rocks
- metals
- metamorphic rocks
- microplates
- Nd-144/Nd-143
- neodymium
- Neoproterozoic
- nesosilicates
- orthosilicates
- Paleozoic
- Precambrian
- Proterozoic
- rare earths
- Russian Federation
- Seward Peninsula
- silicates
- Sr-87
- Sr-87/Sr-86
- stable isotopes
- strontium
- terranes
- U/Pb
- United States
- upper Precambrian
- zircon
- zircon group