NDLI: Staurolite as an isotopic U

Content Provider	Springer Nature Link
Author	Levskii, L. K. Lobikov, A. F.
Copyright Year	2016
Abstract	A new approach is suggested for measuring the real U–Pb and Pb–Pb ages of rock-forming metamorphic staurolite. Previously, two approaches have been used for this purpose: (1) measurement of the lead isotopic compositions, uranium and lead contents in leach substance as a product of the step-leaching technique; age is calculated by plotting the Pb–Pb leaching isochron; and (2) lead and uranium isotopic compositions are measured in completely dissolved mineral material without leaching. In both cases, it is assumed a priori that inclusions, overgrowths, secondary phases, and the host mineral are cogenetic. This assumption may lead to errors in the measured age. The technique suggested in this paper uses various reagents (acids) to purify staurolite from the above-mentioned secondary phases while obtaining a staurolite “pure culture,” its subsequent disolution, introduction of the mixed spike, separation of lead and uranium compounds, and, finally, estimation of a real staurolite age using several samples to plot the monomineralic Pb–Pb isochron or by plotting measured Pb/U ratios in the diagram with concordia. The data can be used then to reconstruct the P–T–t evolution of metamorphism.
Starting Page	517
Ending Page	524
Page Count	8
File Format	PDF
ISSN	10757015
Journal	Geology of Ore Deposits
Volume Number	58
Issue Number	7
e-ISSN	15556476
Language	English
Publisher	Pleiades Publishing
Publisher Date	2017-02-08
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mineral Resources
Content Type	Text
Resource Type	Article
Subject	Geology Economic Geology Geochemistry and Petrology

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