During authigenic mineral
formation, ash assimilated some elements from the surrounding environment, whereas the set of assimilated elements has been considerably different in the Kinnekulle and BII bentonites.
In such contexts, glauconite is an authigenic mineral
developed as pelletal facies (mud coprolites, foraminiferal tests and mineral debris), and less frequently as films growing in holes, cracks and borings on hardgrounds and omission surfaces that may be associated with phosphates (e.
3e), although truncation and mechanical reworking can also separate stages of authigenic mineral
The clastic matrix is composed mainly of silt-size quartz and illite, the minor clastic minerals are feldspars and chlorite, pyrite is a rather common authigenic mineral
However, the complicated geological conditions and resultant authigenic mineral
structures described in these publications resemble, but do not equal those determined and described in the present study.
The presence of authigenic minerals
like kaolinite, gibbsite, boehmite and dickite may owe to the decomposition and prolonged moderate to intense insitu leaching of alumino-silicates present in Mesozoic rocks andpart of Permian rocks.
Zeolites may occur naturally as authigenic minerals
formed from volcanic glass and various rock-forming minerals by interaction with aqueous solution or fluid in many geochemical environments (Breck, 1974; Mumpton, 1977; Gottardi and Galli, 1985; Hay, 1986; Boles, 1988).
3+]-oxyhydroxides dominate among the authigenic minerals
In Authigenic Minerals
of Baltic Terrigenous Sediments (Pin-us, E.
According to the present study, the carriers of the remanent magnetization are (i) allogenic and synsedimentary and/or early diagenetic authigenic ironbearing minerals of the primary sedimentary siliciclastic and carbonate rocks and (u) alteration products of primary minerals or new authigenic minerals
formed during latediagenetic, hydrothermal, or weathering processes.
2005) described the paragenetic sequence of mineralization and characterized the thermal conditions of the formation of different authigenic minerals
in the crater interior.
2%) and the content of light authigenic minerals
(calcite, rare grains of glauconite) increases to 16% of the light minerals.