Trace, rare-earth element, and oxygen isotopic systematics for the genesis of banded iron-formations: Evidence from Kushtagi schist belt, Archaean Dharwar Craton, India

Details Trace, rare-earth element, and oxygen isotopic systematics for the genesis of banded iron-formations: Evidence from Kushtagi schist belt, Archaean Dharwar Craton, India Trace, rare-earth element, and oxygen isotopic systematics for the genesis of banded iron-formations: Evidence from Kushtagi schist belt, Archaean Dharwar Craton, India

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996gecoa..60.3285k&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 60, Issue 17, pp.3285-3294

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The REE distribution pattern shapes ( FREE = 5.92 and 27.87 ppm in chert and hematite, respectively), positive Eu anomalies (Eu/Eu * = 3.25 and 2.1), and La N /Yb N ratios (0.75 and 0.87) of the chert and hematite layers of the oxide facies BIFs of Kushtagi schist belt indicate that these constituents were derived from hydrothermal solutions generated and emplaced at an Archaean ocean ridge. However, their oxygen isotopic composition have been modified by mixing with the ambient ocean water and diagenetic reactions. 18 O values (13.9-17.4%c and -8.6 to 3.3 in chert and hematite, respectively) yield 150-250°C temperature in the diagenetic and lowest greenschist facies field. The mixing model of hydrothermal solutions with ocean water of 1:1000 ratio will not significantly change the oxygen isotope ratio of the ambient ocean water. Therefore, while the trace element data have retained hydrothermal signatures, oxygen isotopic signatures are imprinted by diagenetic processes.

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