The Archean Dongwanzi ophiolite complex, North China craton: 2.505-Billion-year-old oceanic crust and mantle

Science

Volumn 292, Issue 5519, 2001, Pages 1142-1145

  Kusky, Timothy M ^a   Li, Jiang Hai ^b   Tucker, Robert D ^c  

^a Saint Louis University   (United States)

^b PEKING UNIVERSITY   (China)

^c WASHINGTON UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

TECTONICS; THERMAL EFFECTS;

OCEANIC CRUSTS;

SUBMARINE GEOLOGY;

URANIUM; ZIRCONIUM DERIVATIVE;

ACCRETION; ARCHEAN; OCEANIC CRUST; OPHIOLITE; PALEOTEMPERATURE; PLATE BOUNDARY; PLATE TECTONICS;

ARTICLE; CHEMICAL COMPOSITION; CHINA; COMPLEX FORMATION; GEOLOGY; PRIORITY JOURNAL; ROCK; SEA;

EID: 0035844086     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.1059426     Document Type: Article

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16. -13 Å was maintained for U. Average total procedural blanks of 2 pg of Pb and 0.2 pg of U were maintained during the period of analysis; total common-Pb concentrations for all analyses are reported in Web table 1 (13). Initial-Pb corrections used the Pb isotopic composition estimated in (20) at the indicated age of the rock. In nearly all cases, the uncertainty in the amount of and composition of common Pb calculated in this manner represents an insignificant contribution to the error of the calculated ages. Error propagation is similar to that developed in (21), and age errors are reported at 95% confidence limits. Analytical reproducibility at 1σ confidence levels of replicate samples confirms that the parameters used in data reduction (laboratory blank, fractionation, and Daly mass discrimination) and their errors have been evaluated correctly.
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22. Funding and support were provided by the Chinese National Natural Science Foundation, Academica Sinica, Peking University, St. Louis University, and Washington University. We thank X. Huang and Z. Zhang for assistance in the field and Z. X. Peng for assistance with the mass spectrometry and geochronology sample preparation.