Major element distribution in Archean banded iron formation (BIF): influence of metamorphic differentiation
作者： N. KATSUTA , I. SHIMIZU , H. HELMSTAEDT , M. TAKANO , S. KAWAKAMI
DOI: 10.1111/J.1525-1314.2012.00975.X
关键词: Archean 、 Hornblende 、 Metamorphism 、 Geochemistry 、 Grunerite 、 Metamorphic facies 、 Geology 、 Metamorphic rock 、 Amphibole 、 Banded iron formation
摘要: The Archean (2.8 Ga) Banded Iron Formation (BIF) of the Bell Lake region Yellowknife greenstone belt, Canada is recrystallized to metamorphic assemblages amphibolite facies. This BIF characterized by centimetre-scale Fe-rich and Si-rich mesobands. In mesobands, thin layers magnetite microbands are developed in a quartz matrix. mesobands composed mainly Ca-amphibole (hornblende), Fe–Mg amphibole (grunerite), magnetite. foliation locally cuts across mesoband boundaries, indicating mesobanding was formed prior peak metamorphism. Variations mineral modal proportions between diagnostic depositional compositional differences beds. Micro-X-ray fluorescence imaging reveals differentiation within with segregation amphibole, incompatible element Mn concentrated at margins during amphibole-forming reactions. Ti relatively immobile its distribution provides record original structures
harvard.edu
sci-hub.se 参考文章(62)
James C. G. Walker, Kevin J. Zahnle, Lunar nodal tide and distance to the Moon during the Precambrian Nature. ,vol. 320, pp. 600- 602 ,(1986) , 10.1038/320600A0
Pierre-Yves F. Robin, Theory of metamorphic segregation and related processes Geochimica et Cosmochimica Acta. ,vol. 43, pp. 1587- 1600 ,(1979) , 10.1016/0016-7037(79)90179-0
Ann E. Isley, Dallas H. Abbott, Plume‐related mafic volcanism and the deposition of banded iron formation Journal of Geophysical Research. ,vol. 104, pp. 15461- 15477 ,(1999) , 10.1029/1999JB900066
Brian W. Alexander, Michael Bau, Per Andersson, Peter Dulski, Continentally-derived solutes in shallow Archean seawater: Rare earth element and Nd isotope evidence in iron formation from the 2.9 Ga Pongola Supergroup, South Africa Geochimica et Cosmochimica Acta. ,vol. 72, pp. 378- 394 ,(2008) , 10.1016/J.GCA.2007.10.028
J. Hippertt, C. Lana, T. Takeshita, Deformation partitioning during folding of banded iron formation Journal of Structural Geology. ,vol. 23, pp. 819- 834 ,(2001) , 10.1016/S0191-8141(00)00128-0
Yoshinori Hosokawa, Sumito Ozawa, Hiromoto Nakazawa, Yasuyuki Nakayama, An X-ray guide tube and a desk-top scanning X-ray analytical microscope X-Ray Spectrometry. ,vol. 26, pp. 380- 387 ,(1997) , 10.1002/(SICI)1097-4539(199711/12)26:6<380::AID-XRS237>3.0.CO;2-#
David Page, Banded iron formations and palaeoenvironment: a problem in petrogenesis Geology Today. ,vol. 17, pp. 140- 143 ,(2001) , 10.1046/J.0266-6979.2001.00298.X
George E. Williams, Geological constraints on the Precambrian history of Earth's rotation and the Moon's orbit Reviews of Geophysics. ,vol. 38, pp. 37- 59 ,(2000) , 10.1029/1999RG900016
Kazuhiro Miyazaki, A numerical simulation of textural evolution due to Ostwald ripening in metamorphic rocks: A case for small amount of volume of dispersed crystals Geochimica et Cosmochimica Acta. ,vol. 60, pp. 277- 290 ,(1996) , 10.1016/0016-7037(95)00397-5
V. I. FONAREV, S. M. PILUGIN, K. A. SAVKO, M. A. NOVIKOVA, Exsolution textures of orthopyroxene and clinopyroxene in high‐grade BIF of the Voronezh Crystalline Massif: evidence of ultrahigh‐temperature metamorphism Journal of Metamorphic Geology. ,vol. 24, pp. 135- 151 ,(2006) , 10.1111/J.1525-1314.2006.00630.X