Sedimentgeology Laboratory

Acid laboratory

In the acid laboratory u.a. Rock samples are dissolved by means of caustic chemicals to separate certain components of a sample from each other. For example, the framework of palynology is resolved by the refuge of hydrofluoric acid to dissolve the organics, especially spores and pollen, from the silicate constituents. Subsequently, the samples can be prepared by other acids and oxidation processes, which is free of mineral constituents and superfluous organic matter.

Heavy mineral separation in SPT

Heavy mineral separation

Schwerminerale sind Minerale hoher Dichte (> 2,9 g/cm³). Häufig vorkommende Schwerminerale sind u.a. Zirkon, Rutil, Granat und Epidot. Diese werden an Strandbereichen des Meeres, aber auch z.B. an Flußläufen abgelagert.

In our heavy mineral separation lab we use Na-polytungstate (SPT) to extract heavy minerals at a density of 2.85 g/cm³. Usually we use separating funnels, but centrifuging is possible as well. Over time, the heavier elements settle to the bottom, while the lighter fractions remain at the surface due to the difference in density. Extracted heavy minerals are prepared as strewn slides using MeltmountTM 1.622.

Olympus BX50 polarization microscope with PELCON stepping stage and point counter

Microscopy, microphotography & point counting

Our microscopy workstation is equipped with an Olympus BX50 polarization microscope (objectives: 10, 40, 60 and 60/oil immersion) with an Olympus SC50 camera and related software; a PELCON automatic stepping stage with point counter and software; and an Olympus SZH stereo microscope (7.5-64x magnification) with a Canon camera and software. The use of a microscope is often indispensable and is often used in the field of sedimentology in the areas of heavy mineral separation, palynology and micropalaeontology and used for thin-section analysis and polarization microscopy.