Pierwiastki śladowe w utworach żelazistych serii poznańskiej
Abstract
TRACE ELEMENTS IN FERRUGINOUS DEPOSITS OF POZNAŃ SERIES
Summary
Two types of ferruginous deposits are represented in clay sediments of Poznań series. First of them - siderite concretions if fairly common in the middle horizon of the Poznań series and subordinate in the lower horizon. The second type – represented by concretions primarily built of iron oxides - is found throughout the series. The former concretions are monogenic and presumably represent one of the products of diagenesis of clay sediments. In turn, the latter appear to be polygenic and their geological setting suggest that some of them originated as a product of weathering of the siderite concretions, whereas others - from weathering of marly concretions with original concentration of iron ranging from a few to over a dozen percents; the concretions primarily occurring in the mottled clays of the upper horizon of the series appear to be syngenetic or early diagenetic. The paper presents the results of studies on trace elements occurring in the ferruginous and clay deposits and with their behaviour in the course of weathering processes.
Summary
Two types of ferruginous deposits are represented in clay sediments of Poznań series. First of them - siderite concretions if fairly common in the middle horizon of the Poznań series and subordinate in the lower horizon. The second type – represented by concretions primarily built of iron oxides - is found throughout the series. The former concretions are monogenic and presumably represent one of the products of diagenesis of clay sediments. In turn, the latter appear to be polygenic and their geological setting suggest that some of them originated as a product of weathering of the siderite concretions, whereas others - from weathering of marly concretions with original concentration of iron ranging from a few to over a dozen percents; the concretions primarily occurring in the mottled clays of the upper horizon of the series appear to be syngenetic or early diagenetic. The paper presents the results of studies on trace elements occurring in the ferruginous and clay deposits and with their behaviour in the course of weathering processes.