Inorganic geochemistry and mineralogy of unit B, Duaringa oil shale deposit
✍ Scribed by John H. Patterson; Arthur W. Lindner
- Publisher
- Elsevier Science
- Year
- 1990
- Tongue
- English
- Weight
- 607 KB
- Volume
- 69
- Category
- Article
- ISSN
- 0016-2361
No coin nor oath required. For personal study only.
✦ Synopsis
Chemical and mineraIa~~1 analyses are presented for a continuous sequence of samples over the full stratigraphic section of Unit B, Duaringa oi1 shale deposit. Correlation techniques and electron microprobe analysis have been used to determine element and mineral associations and the composition of manganoan siderites. The work presented provides a detailed chemical and mineralogical description of the unit.The geochemistry and mineraiogy of Duaringa oil shales is similar to that of other Tertiary oil shales excepting that the composition of manganoan siderite crystals is unusually variable. A number of minerals show systematic trends with stratigraphic depth and oil shale grade in Unit B. In particular, pyrite correlates positively and manganoan siderite correlates negatively with oil shale grade. Manganoan siderites were inversely variable in manganese and iron content within individual grains. Manganese contents increased progressively from 1 wt% MnO at the extremities to as much as 15 wt% MnO in the central regions of some grains. This may reflect decreasing availabilitv of manganese in the pore liquors as crystallization proceeded during earl; diagenesis.