Sm-Nd and Rb-Sr Chronology of Continental Crust Formation

  title={Sm-Nd and Rb-Sr Chronology of Continental Crust Formation},
  author={Malcolm T. McCulloch and G. J. Wasserburg},
  pages={1003 - 1011}
Samarium-neodymium and rubidium-strontium isotopic systematics together with plausible assumptions regarding the geochemical evlution of continental crust material, have been used to ascertain the times at which segments of continental crust were formed. Analyses of composites from the Canadian Shield representing portions of the Superior, Slave, and Churchill structural provinces indicate that these provinces were all formed within the period 2.5 to 2.7 aeons. It has been possible to determine… 

Origin of the Sudbury Complex by Meteoritic Impact: Neodymium Isotopic Evidence

Samarium-neodymium isotopic data suggest that the Sudbury Complex formed from melts generated in the upper crust and are consistent with a meteoritic impact.

Nd—Sr isotopic composition of granulites and constraints on the evolution of the lower continental crust

In a statistical study of granulite facies rocks, we have analysed 32 samples with ages ranging from 2,900 to 200 Myr for Sm, Nd, Rb and Sr and 143Nd/144Nd and 87Sr/86Sr ratios. The Sm/Nd ratio is

Nd and Sr isotopes as clastic provenance indicators in the Upper Carboniferous of Britain

Nd-Sr data indicate that two isotopically distinct terrains supplied sediment to the Upper Carboniferous basins of Britain. One terrain was relatively depleted in radiogenic Nd, and included large

Sources of Continental Crust: Neodymium Isotope Evidence from the Sierra Nevada and Peninsular Ranges

The data suggest that the batholiths represent mixtures of materials derived from chemically depleted mantle identical to the source of island arcs and old continental crust, probably sediments or metasediments with a provenance age of ∼1.6 x 109 years, consistent with a model for continental growth.



Rb-Sr whole-rock dating of late diagenetic to anchimetamorphic, palaeozoic sediments in southern France (Montagne Noire)

AbstractRb-Sr whole-rock and mineral analyses are reported from Early Paleozoic sediments of the southern rim of the French Central Massif (Montagne Noire).The sediments—mainly pelites, silt- and

Rb/Sr Isochrons for some Precambrian Rocks in the Hanson Lake Area, Saskatchewan: Reply

Rb–Sr whole rock analyses of rocks from the Hanson Lake area; Saskatchewan, combined with geological evidence suggest that there were three thermal events in that region during Precambrian time.

Age Studies of Zircon and Feldspar Concentrates from the Franconia Sandstone

We were unable to use unequivocally the convergence idea of Pettijohn and Barth for a determination of the time of onset of significant continent formation. Analyses of detrital zircon mixtures

The geochemistry and evolution of early precambrian mantle

Seven high-purity cumulate clinopyroxenes from 2.7 b.y. maficultramafic rock associations from the Abitibi belt, Superior Province, Canada, have been analyzed for major elements and K, Rb, Cs, Ba, Sr

Rubidium-Strontium Isochron Study of the Grenville Front near Lake Timagami, Ontario

Rubidium-strontium isotopic analyses of whole-rock samples and of constituent minerals from a suite of rocks taken across the Grenville Front demonstrate that granitic rocks of the Superior province and older metasedimentary rocks were reconstituted during Grenville metamorphism.

Rubidium/Strontium and Strontium-87/Strontium-86 Ratios in Deep Crustal Material

RECENT work on the strontium isotopes, stimulated by a paper of Gast1, has shown variations in the initial 87Sr/86Sr ratio of rocks. The interpretation of this observation has not been clear but it