New U-Pb titanite age data on the rocks from the Karelian craton and the Belomorian mobile belt, Fennoscandian Shield

被引：0
作者：
N. S. Nesterova
T. I. Kirnozova
M. M. Fugzan
机构：
[1] Russian Academy of Sciences,Institute of Geology, Karelian Scientific Center
[2] Russian Academy of Sciences,Vernadsky Institute of Geochemistry and Analytical Chemistry
来源：
Geochemistry International | 2011年 / 49卷
关键词：
titanite; geochronology; U-Pb isotope age; Fennoscandian shield;
D O I：
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中图分类号：
学科分类号：
摘要：
We test the possibility of applying titanite as indicator of the boundaries between the Belomorian mobile belt and the Karelian craton of the Fennoscandian Shield. U-Pb isotope dating established wide variations of titanite ages in the Belomorian mobile belt and the Karelian craton. The titanites from the Karelian craton are mainly Archean in age (2.52–2.86 Ga), whereas the Belomorian mobile belt contains, with few exceptions, Paleoproterozoic titanites (1.74–1.95 Ga). In the Karelian craton, the age of titanite, in general, records the cratonization of the Earth’s crust (2.8 Ga and 2.6–2.7 Ga, respectively). In the Belomorian mobile belt, it presumably reflects the timing of the exhumation of tectonic nappes from the mid-crustal depths during the collisional stage of the evolution of the Lapland-Kola orogen.
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页码：1161 / 1167
页数：6
相关论文
共 39 条
[1]  
Bibikova E. V.(1999)Early Precambrian Tectono-Thermal Evolution of the Earth Crust in the Karelian and Belomorian Provinces of the Baltic Shield: U-Pb Isotopic Evidence from Sphene and Rutile Geochem. Int. 37 750-764
[2]  
Slabunov A. I.(2001)Titanite-Rutile Thermochronometry across the Boundary Between the Archaean Craton in Karelia and the Belomorian Mobile Belt, Eastern Baltic Shield Precambrian Res. 105 315-330
[3]  
Bogdanova S. V.(2006)The Archean of the Baltic Shield: Geology, Geochronology, and Geodynamic Settings Geotectonics 40 409-433
[4]  
Skiold T.(2000)Sphene (Titanite): Phase Relations and Role As a Geochronometer Chem. Geol. 172 131-148
[5]  
Bibikova E.(1993)Lead Diffusion in Titanite and Preliminary Results on the Effects of Radiation Damage on Pb Transport Chem. Geol. 110 177-194
[6]  
Skiöld T.(1997)A Crystal-Chemical Basis for Pb Retention and Fission-Track Annealing Systematics in U-Bearing Minerals, with Implications for Geochronology Earth Planetary Sci. Lett. 150 277-290
[7]  
Bogdanova S.(1987)Uranium-Lead Zircon and Titanite Ages from the Northern Portion of the Western Gneiss Region, South-Central Norway Earth Planet. Sci. Lett. 81 203-211
[8]  
Slabunov A. I.(1973)A Low-Contamination Method for Hydrothermal Decomposition of Zircon and Extraction of U and Pb for Isotopic Age Determinations Geochim. Cosmochim. Acta 37 485-500
[9]  
Lobach-Zhuchenko S. B.(1975)Approximations of Terrestrial Lead Isotope Evolution by a Two-Stage Model Earth Planet. Sci. Lett. 26 207-221
[10]  
Bibikova E. V.(1993)Archaean Rocks from Southeastern Karelia (Karelian Granite-Greenstone Terrain) Precambrian Res. 62 375-388
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