Tab. 1: Mineralogical composition and chemical analyses of major and trace elements of Ameghino Formation rocks ...

As a result of a petrographical, mineralogical and geochemical characterization of the Ameghino Formation mudstones (Upper Jurassic- Lower Cretaceous, Antarctic Peninsula), "epiclastic" radiolaria-rich and mixed (radiolaria-rich + tuff) mudstone types were recognized. Contents of clastic m...

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Bibliographic Details
Main Authors: Scasso, R A, Grunenberg, Thomas, Bausch, W M
Format: Dataset
Language:English
Published: PANGAEA 2011
Subjects:
Sample code/label
Sample ID
Quartz
Plagioclase
Feldspar
Pyrite
Calcite
Smectite
Illite
Chlorite
Minerals
Lithology/composition/facies
Silicon dioxide
Aluminium oxide
Iron oxide, Fe2O3
Manganese oxide
Magnesium oxide
Calcium oxide
Sodium oxide
Potassium oxide
Titanium dioxide
Phosphorus pentoxide
Sulfur, total
Rubidium
Strontium
Zinc
Zirconium
Geological sample
Antarc*
Antarctic
Antarctic Peninsula
Online Access:https://dx.doi.org/10.1594/pangaea.763364
https://doi.pangaea.de/10.1594/PANGAEA.763364
Description
Summary:As a result of a petrographical, mineralogical and geochemical characterization of the Ameghino Formation mudstones (Upper Jurassic- Lower Cretaceous, Antarctic Peninsula), "epiclastic" radiolaria-rich and mixed (radiolaria-rich + tuff) mudstone types were recognized. Contents of clastic material in the mudstones generally increase with younger paleontological age, but local exceptions to this trend have been found. The anoxic environment of the lower part of the sequence changes to more oxidizing conditions towards the top, in transition to the Hauterivian - Barrêmian conglomerates. Element to element correlations show good agreement with the normal differentiation trends of volcanic (andesite-rhyolite) rocks, suggesting that the overall sequence is mainly volcanic in origin with various grade of reworking. For example, the radiolaria-rich mudstone matrix could have been originated from very fine touffaceous suspensions deposited very slowly after the main fall of the tuffs. However, in the upper part of ... : Supplement to: Scasso, R A; Grunenberg, Thomas; Bausch, W M (1991): Mineralogical and geochemical characterization of the Ameghino Formation Mudstones (Upper Jurassie, Antarctic Peninsula) and its stratigraphieal, diagenetical and paleoenvironmental Meaning. Polarforschung, 59(3), 179-198 ...

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