authigenic mineral

[¦ȯ·thə¦jen·ik ′min·rəl]

(mineralogy)

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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.

Internal stratification of two thick ordovician bentonites of estonia: deciphering primary magmatic, sedimentary, environmental and diagenetic signatures/Kahe paksu Ordoviitsiumi bentoniidi sisemine stratifikatsioon: magmaliste, setteliste, keskkonna ja diageneetiliste tunnuste desifreerimine

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.

Glauconitic laminated crusts from hydrothermal alteration of Jurassic pillow-lavas (Betic Cordillera, S Spain): a microbial influence case

3e), although truncation and mechanical reworking can also separate stages of authigenic mineral formation.

Micromorphology of sepiolite occurrences in recent lacustrine deposits affected by soil development

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.

Lechatelierite-bearing microspherules from semicoke hill (Kivioli, Estonia): contribution to the contamination problem of natural microtektites

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.

Unusual features of the middle Devonian Narva formation covering the oil shale bearing rocks in Estonia

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.

THE MINERALOGICAL AND PETROGRAPHICAL STUDIES OF THE LITHOFACIES OF THE HANGU FORMATION IN THE SALT RANGE, PUNJAB

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).

Zeolitisation of Neogene sedimentary and pyroclastic rocks exposed in Paipa (Boyaca), in the Colombian Andes: simulating their natural formation conditions

3+]-oxyhydroxides dominate among the authigenic minerals.

Phyllosilicates in the sediment-forming processes: weathering, erosion, transportation, and deposition

In Authigenic Minerals of Baltic Terrigenous Sediments (Pin-us, E.

Diagenetic influences on iron-bearing minerals in Devonian carbonate and siliciclastic rocks of Estonia / Diageneetiliste muutuste moju rauamineraalidele Eesti Devoni karbonaatsetes ja terrigeensetes kivimites

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.

Multiply remagnetized Silurian carbonate sequence in Estonia/Sekundaarsed magnetiseeritused Eesti Siluri karbonaatsetes kivimites

2005) described the paragenetic sequence of mineralization and characterized the thermal conditions of the formation of different authigenic minerals in the crater interior.

Impact-induced and diagenetic changes in minerals in the sandy ejecta of the Kardla crater, NW Estonia/Meteoriidiplahvatuse mojul ja diageneesi valtel tekkinud mineraalterade muutused Kardla kraatrit umbritsevas liivakas valjapaiskelasundis

2%) and the content of light authigenic minerals (calcite, rare grains of glauconite) increases to 16% of the light minerals.

The stratotype of the Orasoja Member (Tremadocian, Northeast Estonia): lithology, mineralogy, and biostratigraphy/Orasoja kihistiku (Tremadocian, Kirde-Eesti) stratotuup: litoloogia, mineraloogia ja biostratigraafia