Geology, age and field relations of Hadean zircon-bearing supracrustal rocks from Quad Creek, eastern Beartooth Mountains (Montana and Wyoming, USA)

Analisa C. Maier, Nicole L. Cates, Dustin Trail, S. Mojzsis

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Quad Creek Paleoarchean (≤3250Ma) quartzites in southern Montana host Hadean (pre-3850Ma) detrital zircons. Although an accessible resource for investigating early Earth processes distinct from other better known ancient zircon localities, the outcrop-scale geological and geochemical context of these rocks has not previously been well documented. New (1:250) mapping reveals a varied suite of isoclinally folded, sheared and variably deformed chromite-bearing banded and massive quartzites, garnetiferous siliceous (migmatitic) paragneisses, amphibolite, quartz-biotite schists and quartz+magnetite rocks (banded iron-formation; BIF). Conventional ion microprobe U-Pb zircon ages of populations from different quartzites and a paragneiss show outgrowth rim ages on older inherited detrital igneous zircon cores that match documented regional metamorphic events evidenced elsewhere in the Wyoming Craton. Weighted mean 207Pb/ 206Pb ages for the youngest concordant zircon cores of igneous derivation indicate the Quad Creek sediments were deposited by about 3250Ma. Coupled with a large zircon 207Pb/ 206Pb age survey (n=1274), and an extended U-Th-Pb depth-profile of the oldest grain in our sample set, these data support the notion that the oldest crust tapped by these sediments was comparable in age to the ca. 4000Ma Acasta Gneiss Complex. This similarity is suggestive of both of a linkage between the Wyoming Craton and the Western Slave Province, and the lingering influence of Hadean crust well into the Archean.

Original languageEnglish
Pages (from-to)47-57
Number of pages11
JournalChemical Geology
Volume312-313
DOIs
Publication statusPublished - Jun 18 2012

Fingerprint

Bearings (structural)
Hadean
supracrustal rock
Geology
zircon
Rocks
geology
mountain
Quartz
craton
Sediments
Ferrosoferric Oxide
crust
quartz
Chromite
early Earth
banded iron formation
slave
ion microprobe
chromite

Keywords

  • Beartooth Mountains
  • Detrital
  • Geochronology
  • Hadean
  • Slave craton
  • Zircon

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geology

Cite this

Geology, age and field relations of Hadean zircon-bearing supracrustal rocks from Quad Creek, eastern Beartooth Mountains (Montana and Wyoming, USA). / Maier, Analisa C.; Cates, Nicole L.; Trail, Dustin; Mojzsis, S.

In: Chemical Geology, Vol. 312-313, 18.06.2012, p. 47-57.

Research output: Contribution to journalArticle

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