Results of U-Pb dating of zircon and baddeleyite from the Noril'sk-1 ultramafic-mafic intrusion (Russia)

被引：18
作者：
Malitch, K. N. [1 ,2 ]
Badanina, I. Yu. [1 ]
Belousova, E. A. [2 ]
Tuganova, E. V. [3 ]
机构：
[1] Russian Acad Sci, AN Zavaritsky Inst Geol & Geochem, Uralian Branch, Ekaterinburg 620075, Russia
[2] Macquarie Univ, ARC Natl Key Ctr Geochem Evolut & Metallogeny Con, Sydney, NSW 2109, Australia
[3] AP Karpinsky Geol Res Inst VSEGEI, St Petersburg 199106, Russia
来源：
RUSSIAN GEOLOGY AND GEOPHYSICS | 2012年 / 53卷 / 02期
关键词：
zircon; baddeleyite; U-Pb age; the Noril'sk-1 ultramafic-mafic intrusion; protracted evolution; FLOOD BASALTS; ISOTOPE EVIDENCE; TRACE-ELEMENT; MANTLE; ORIGIN; PLUME;
D O I：
10.1016/j.rgg.2011.12.010
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
We present for the first time the mineralogical and isotope-geochemical particularities of zircon and baddeleyite from various rocks of the economic ore-bearing Noril'sk-1 intrusion located in the northwestern part of the Siberian platform. The ultramafic-mafic Noril'sk-1 intrusion hosts one of the world's major economic platinum-group-element (PGE)-Cu-Ni sulphide deposits. A detailed study of crystal morphology and internal structure identify four zircon populations, characterized by different U-Pb (SHRIMP-II) ages. The U-Pb ages of baddeleyite and the defined zircon populations cover a significant time span (from 290 +/- 2.8 to 226.7 +/- 0.9 Ma). The established U-Pb ages imply that crystallization of baddeleyite and zircon populations corresponds to several stages of protracted evolution of the ore-forming magmatic system (290 +/- 2.8, 261.3 +/- 1.6, 245.7 +/- 1.1, 236.5 +/- 1.8, and 226.7 +/- 0.9 Ma, respectively) that served as the favorable factor for accumulation of magmas and ores of unique scales and concentrations. (C) 2012, V.S. Sobolev IGM, Siberian Branch of the RAS. Published by Elsevier B. V. All rights reserved.
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收藏
页码：123 / 130
页数：8
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