Aar: Composition of glaciar sediments from the Aar massif...
In compositions: Compositional Data Analysis

Aar	R Documentation

Composition of glaciar sediments from the Aar massif (Switzerland)

Description

Geochemical composition of glaciar sediments from the Aar massif region (Switzerland), major oxides and trace elements.

Usage

data(Aar)

Details

Composition of recent sediments of several morraines and streams from glaciers around the Aar massif, including both major oxides and trace elements. The major oxides are expressed in weight percent (total sum reported in column SumOxides), from Silica (SiO2, column 3) to total Iron 3 Oxide (Fe2O3t, column12, incorporating FeO recasted to Fe2O3). The trace elements are reported in parts per million (ppm, mg/Kg) between columns 14 (Ba) and 29 (Nd). Partial sum of the trace elements (in ppm) and of all traces and major oxides (in %) are also reported.

Apart of the compositional information, two covariables are included: Sample and GS. The variable Sample reports the ID of the sample material. This material was sieved in 11 grain size fractions, and each fraction was analysed separately after drying. The grain size fraction of each subsample is reported in variable GS, representing the upper limit of the size fraction reported in \phi scale, e.g. the binary log transformation of the average diameter \bar{d}

\phi = -\log_2 (\bar{d})

The Aar is a granitic-granodioritic-gneissic massif of the Alps, in Switzerland, comprised of several intrusions with different compositions within the range of granitoid lithologies. Details of the region, mineralogy, procedures and study questions behind the data can be found in von Eynatten at al (2012) and references thereon.

Note

Courtesy of H. von Eynatten

Source

von Eynatten H.; Tolosana-Delgado, R.; Karius, V (2012) Sediment generation in modern glacial settings: Grain-size and source-rock control on sediment composition. Sedimentary Geology 280 (1): 80-92 \Sexpr[results=rd]{tools:::Rd_expr_doi("10.1016/j.sedgeo.2012.03.008")}