Item talk:Q304355

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   "@type": "Article",
   "additionalType": "Journal Article",
   "name": "Ediacaran-Ordovician magmatism and REE mineralization in the Wet Mountains, Colorado, USA: Implications for failed continental rifting",
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       "url": "https://pubs.usgs.gov/publication/70242847"
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       "value": 70242847
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       "propertyID": "DOI",
       "value": "10.1029/2022TC007674",
       "url": "https://doi.org/10.1029/2022TC007674"
     }
   ],
   "journal": {
     "@type": "Periodical",
     "name": "Tectonics",
     "volumeNumber": "42",
     "issueNumber": "4"
   },
   "inLanguage": "en",
   "isPartOf": [
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       "name": "Tectonics"
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   "datePublished": "2023",
   "dateModified": "2023-04-20",
   "abstract": "Structures associated with Ediacaran-Ordovician alkaline magmatism and the timing of rare earth element (REE) mineralization in the Wet Mountains, CO, were analyzed using field, geophysical, and U-Th-Pb isotope methods to interpret their tectonic setting in the context of previously proposed rift models. The Wet Mountains are known for thorium and REE mineralization associated with failed rift-related, Ediacaran-Ordovician alkaline intrusions and veins. Structural field data indicate that alkaline dikes and mineralized veins are controlled by a system of northwest-striking, high-angle faults and tension fractures formed in a 040\u00b0-directed extensional regime. Magnetic and surface expressions of Democrat Creek and McClure Mountain complexes show tectonic elongation toward \u223c045\u00b0, consistent with NE-directed extension. Magnetic data also suggest the existence of a fourth, previously unrecognized mafic-ultramafic complex of inferred Cambrian age with a similar elongated orientation. Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS)\u00a0208Pb/232Th analysis of low-uranium zircon from carbonatite dikes and in situ\u00a0206Pb/238U LA-ICP-MS analysis of monazite in mineralized dikes yielded 465\u00a0\u00b1\u00a018\u00a0Ma and 489\u00a0\u00b1\u00a033\u00a0Ma ages, respectively. These ages are consistent with the expected age based on slightly older, cross-cut syenite dikes and the hypothesized Ordovician end to failed rift-related magmatism. The Ediacaran-Ordovician age of alkaline magmatic rocks and the associated northeast-directed extension direction are similar to those of the along-strike, Ediacaran-Cambrian Southern Oklahoma Aulacogen. Therefore, the failed rift system in the Wet Mountains is interpreted to be a northwestern continuation of the Southern Oklahoma Aulacogen with carbonatite magmatism and thorium/REE mineralization representing late intrusive phases.",
   "description": "e2022TC007674, 28 p.",
   "publisher": {
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     "name": "American Geophysical Union"
   },
   "author": [
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       "name": "Magnin, Benjamin Patrick",
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       "name": "Kuiper, Yvette",
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           "name": "Colorado School of Mines"
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       "name": "Anderson, Eric D.",
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