Nd isotopes and the origin of Grenville-age rocks in Texas: implications for Proterozoic evolution of the United States mid- Continent region

P. J. Patchett, Joaquin Ruiz

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92 Citations (Scopus)

Abstract

Nd isotopic data were obtained for Precambrian Grenville-belt rocks in Texas. Almost all Precambrian igneous, metamorphic, and sedimentary rocks from the three regions document addition to North America of mantle-derived crustal materials in the 1.6-1.0 Ga interval. The exception is a quartzite from the westernmost (Franklin Mountains) exposure, which was derived from ~1.8 Ga crust of the southwestern United States. These results can be interpreted in two ways: 1) as documenting 0-20% additions of older crustal material to mantle-derived products 1.4-1.0 Ga ago; or 2) as documenting derivation of the Grenville exposures by recycling of older crustal protoliths separated from the mantle 1.6-1.3 Ga ago. If the ages represent older crustal protoliths, then they would have formed coevally with the 1.5-1.3 Ga Granite-Rhyolite Terranes of the continental interior USA. This would imply that the Granite-Rhyolite Terranes were formed during orogenic/accretionary processes in the adjoining Grenville Belt, and are not anorogenic in association, as conventionally assumed. -from Authors

Original languageEnglish (US)
Pages (from-to)685-695
Number of pages11
JournalJournal of Geology
Volume97
Issue number6
StatePublished - 1989

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Isotopes
Proterozoic
Southwestern United States
isotope
mantle
rhyolite
protolith
terrane
Precambrian
Recycling
granite
North America
rock
continental interior
quartzite
igneous rock
metamorphic rock
sedimentary rock
recycling
crust

ASJC Scopus subject areas

  • Medicine(all)
  • Geology

Cite this

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title = "Nd isotopes and the origin of Grenville-age rocks in Texas: implications for Proterozoic evolution of the United States mid- Continent region",
abstract = "Nd isotopic data were obtained for Precambrian Grenville-belt rocks in Texas. Almost all Precambrian igneous, metamorphic, and sedimentary rocks from the three regions document addition to North America of mantle-derived crustal materials in the 1.6-1.0 Ga interval. The exception is a quartzite from the westernmost (Franklin Mountains) exposure, which was derived from ~1.8 Ga crust of the southwestern United States. These results can be interpreted in two ways: 1) as documenting 0-20{\%} additions of older crustal material to mantle-derived products 1.4-1.0 Ga ago; or 2) as documenting derivation of the Grenville exposures by recycling of older crustal protoliths separated from the mantle 1.6-1.3 Ga ago. If the ages represent older crustal protoliths, then they would have formed coevally with the 1.5-1.3 Ga Granite-Rhyolite Terranes of the continental interior USA. This would imply that the Granite-Rhyolite Terranes were formed during orogenic/accretionary processes in the adjoining Grenville Belt, and are not anorogenic in association, as conventionally assumed. -from Authors",
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N2 - Nd isotopic data were obtained for Precambrian Grenville-belt rocks in Texas. Almost all Precambrian igneous, metamorphic, and sedimentary rocks from the three regions document addition to North America of mantle-derived crustal materials in the 1.6-1.0 Ga interval. The exception is a quartzite from the westernmost (Franklin Mountains) exposure, which was derived from ~1.8 Ga crust of the southwestern United States. These results can be interpreted in two ways: 1) as documenting 0-20% additions of older crustal material to mantle-derived products 1.4-1.0 Ga ago; or 2) as documenting derivation of the Grenville exposures by recycling of older crustal protoliths separated from the mantle 1.6-1.3 Ga ago. If the ages represent older crustal protoliths, then they would have formed coevally with the 1.5-1.3 Ga Granite-Rhyolite Terranes of the continental interior USA. This would imply that the Granite-Rhyolite Terranes were formed during orogenic/accretionary processes in the adjoining Grenville Belt, and are not anorogenic in association, as conventionally assumed. -from Authors

AB - Nd isotopic data were obtained for Precambrian Grenville-belt rocks in Texas. Almost all Precambrian igneous, metamorphic, and sedimentary rocks from the three regions document addition to North America of mantle-derived crustal materials in the 1.6-1.0 Ga interval. The exception is a quartzite from the westernmost (Franklin Mountains) exposure, which was derived from ~1.8 Ga crust of the southwestern United States. These results can be interpreted in two ways: 1) as documenting 0-20% additions of older crustal material to mantle-derived products 1.4-1.0 Ga ago; or 2) as documenting derivation of the Grenville exposures by recycling of older crustal protoliths separated from the mantle 1.6-1.3 Ga ago. If the ages represent older crustal protoliths, then they would have formed coevally with the 1.5-1.3 Ga Granite-Rhyolite Terranes of the continental interior USA. This would imply that the Granite-Rhyolite Terranes were formed during orogenic/accretionary processes in the adjoining Grenville Belt, and are not anorogenic in association, as conventionally assumed. -from Authors

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