Abstract
Red beds are not entirely red sometimes, in which grey-green spheroids or irregular spots can be found. However, the formation mechanism of grey-green spheroids or irregular spots in red beds is not clear so far. Samples taken from well JK1 in Jiaozhou area of Jiaolai Basin displayed that the reduction spheroids have more Vanadium (V) element, less TFe3O4 and Lead (Pb) element, almost the same content of other elements such as FeO and so on, comparing the red parts of the samples. The existence of organisms can explain the existence of green reductive spheres in the red beds formed under the oxidation environment.
Highlights
Color is one of the most important physical indicators of sedimentary rocks, which can be used for dividing rock types, stratigraphic division, analyzing palaeogeographic climate and sedimentary redox state and so on
Samples taken from well JK1 in Jiaozhou area of Jiaolai Basin displayed that the reduction spheroids have more Vanadium (V) element, less TFe3O4 and Lead (Pb) element, almost the same content of other elements such as FeO and so on, comparing the red parts of the samples
Formation mechanism of reduction spheroids in red beds from the Baikouquan Formation of Mahu depression is that iron oxide is reduced by osmotic water, leaving a faded light green-gray spot after reduction [2]
Summary
Color is one of the most important physical indicators of sedimentary rocks, which can be used for dividing rock types, stratigraphic division, analyzing palaeogeographic climate and sedimentary redox state and so on. Red beds are not entirely red sometimes, in which grey-green spheroids or irregular spots can be found. Green reduction spheroids with dark cores containing enrichments of tellurium (Te) and selemium are found in red beds sediments from Mesoproterozoic successions [1]. Samples from red beds in Jiaolai Basin were studied in order to ascertain formation mechanism of reduction spheroids in red beds
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