Sm-Nd isotope study of early Archean rocks, Qianan, Hebei Province, China

Details Sm-Nd isotope study of early Archean rocks, Qianan, Hebei Province, China Sm-Nd isotope study of early Archean rocks, Qianan, Hebei Province, China

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50..625h&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 50, April 1986, p. 625-631.

Physics

7

Geochronology, Gneiss, Neodymium Isotopes, Petrology, Precambrian Period, Samarium Isotopes, Amphiboles, Chemical Analysis, China, Earth Mantle, Rocks

Scientific paper

The geochronology of amphibolitic and gneiss rocks in the Qianan region in China is examined. Sm-Nd isotopic measurements were performed to determine if the rocks existed in the early Archean age. The average age for the amphibolite samples is 3.50 + or - 0.08 billion years with an initial epsilon(Nd) value of 3.3 + or - 0.3, and for the gneiss samples the average age is also 3.5 billion years. The high initial epsilon(Nd) value indicates that the mantle magma source is depleted of magmaphile elements and the geochemistry of the early Archean mantle is similar to the modern upper mantle.

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