«IZVESTIYA IRKUTSKOGO GOSUDARSTVENNOGO UNIVERSITETA». SERIYA «NAUKI O ZEMLE»
«THE BULLETIN OF IRKUTSK STATE UNIVERSITY». SERIES «EARTH SCIENCES»
ISSN 2073-3402 (Print)

List of issues > Series «Earth Sciences». 2009 . Vol. 1

Ore leads from the Gargan block and southern margin of the Siberian craton: conjugated Holmes–Houtermans – Concordia–Discordia models

Author(s)
Rasskazov S. V., Brandt S. B.
Abstract

The conjugated Holmes–Houtermans – Concordia–Discordia model has been substantiated with determination of μ (238U/204Pb), moments of U–Pb-system closure T and separation t. The model has been applied for interpretation of separated leads from ore deposits in Archean terranes of Central Asia: the Gargan block and southern margin of the Siberian craton. Leads of B-type from the former are interpreted as separated from a protolith of 4,31 Ga in a time interval of 2,35–1,40 Ga and J-type leads from the latter as separated from another protolith of  3,82 Ga in a time interval of 1,80–0,25 Ga. The former protolith (m = 11,0) is referred to the end of the initial planetary accretion and the latter one (m = 20,1) to the end of the late meteoritic bombardment of the early Earth about 3,9 Ga.

Keywords
gold deposits, Asia, early Earth, Pb isotopes
UDC
553/41+553. 42553. 3/9(571.53/. 55)

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