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Ion-probe U–Pb dating of authigenic and detrital opal from Neogene-Quaternary alluvium

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Leonid Neymark, and James B. Paces, 2013, Ion-probe U–Pb dating of authigenic and detrital opal from Neogene-Quaternary alluvium: Earth and Planetary Science Letters, v. 361.

Summary

Knowing depositional ages of alluvial fans is essential for many tectonic, paleoclimatic, and geomorphic studies in arid environments. The use of U–Pb dating on secondary silica to establish the age of Neogene-Quaternary clastic sediments was tested on samples of authigenic and detrital opal and chalcedony from depths of ∼25 to 53 m in boreholes at Midway Valley, Nevada. Dating of authigenic opal present as rinds on rock clasts and in calcite/silica cements establishes minimum ages of alluvium deposition; dating of detrital opal or chalcedony derived from the source volcanic rocks gives the maximum age of sediment deposition.Materials analyzed included 12 samples of authigenic opal, one sample of fracture-coating opal from bedrock, [...]

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Author :
Leonid Neymark, James B. Paces
Publisher :
Elsevier

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Type Scheme Key
local-index unknown 70187336
local-pk unknown 70187336
doi http://www.loc.gov/standards/mods/mods-outline-3-5.html#identifier doi:10.1016/j.epsl.2012.11.037
series unknown Earth and Planetary Science Letters

Citation Extension

citationTypeArticle
journalEarth and Planetary Science Letters
languageEnglish
parts
typevolume
value361

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