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banded, striped, banding, bandy [Terms applied to rocks having thin and nearly parallel bands of varying colo(u)rs, minerals or textures]●gebändert About this entry Cite this entry (2014).banded. In: Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik. Springer, Berlin, Heidelberg. http...
At the Gouap area, the occurrence of minerals such as epidote, chlorite and specially dissemi- nated pyrite in the amphibole-pyrite iron formations suggests secondary hydrothermal alteration. The chondrite-like signature (24 < Y/Ho < 34) of this rock also indicate the resetting of HREE ...
5. v) The distribution of organic carbon in rock facies and minerals. 6. vi) The difference between Proterozoic and present day atmospheres and surface waters. 7. vii) The fossil record of the early Proterozoic, and coupled to this the role that chelation, complex formation, stable colloids ...
BIFs are composed primarily of iron oxides and silica, with minor amounts of other minerals such as manganese, magnesium, and aluminum. The iron oxides in BIFs are typically hematite (Fe₂O₃) and magnetite (Fe3O4.). The silica in BIFs is typically chert, which is a microcrystalline ...
Rare earth elements in Hamersley BIF minerals Minerals from the Hamersley banded iron formation Alibert,Chantal - 《Geochimica Et Cosmochimica Acta Journal of the Geochemical Society & the Meteoritical Society》 被引量: 0发表: 2016年 Distinguishing primary versus secondary geochemical and silicon isotop...
R. 238U/235U systematics in terrestrial uranium-bearing minerals. Science 335, 1610–1614 (2012). Article Google Scholar McLean, N. M., Bowring, J. F. & Bowring, S. A. An algorithm for U–Pb isotope dilution data reduction and uncertainty propagation. Geochem. Geophys. Geosyst. 12, Q...
1992), while length-fast (“normal”) chalcedony is common in non-sulfate environments at neutral to acid pH (Folk and Pittman 1971), although the exact controls of their formation are still poorly understood (Keene 1983). These silica phases are also typically associated with other minerals ...
presence of ferruginous waters in a basin. Some fractionation of REE among various mineral phases may result from diagenesis and metamorphism, but critically, the REE patterns of Fe minerals (e.g., magnetite and hematite) tend to correspond well to bulk-rock patterns50. Furthermore, bulk ...
Hansen, H., and Poulsen, I.F. (1999) Interaction of synthetic sulphate “green rust” with phosphate and the crystallization of vivianite. Clays and Clay Minerals, 47, 312–318.10.1346/CCMN.1999.0470307Search in Google Scholar Heider, F., Dunlop, D.J., and Sugiura, N. (1987) Magnetic ...