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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
Authigenesis of Titanium Minerals in Two Proterozoic Sedimentary Rocks from Southern and Central Sweden
Sadoon Morad, Ala Adin Aldahan
ABSTRACT
The occurrence of authigenic titanium minerals--rutile, anatase, brookite, and sphene--is recorded in two sequences of sedimentary rocks of Proterozoic age, namely the Visingso Group and the Dala Sandstone Formation. The rocks are sandstones, shales, and carbonates. Due to diagenesis of the Visingso Group and diagenesis to low-grade metamorphism of the Dala Sandstone Formation, the unstable titanium-bearing minerals, mostly biotite and ilmenite, released their titanium. This titanium was involved in the formation of different titanium minerals either on the altered detrital particles, mostly biotite and ilmenite, or in pore spaces. These titanium minerals are often found to attack silicate minerals such as quartz and feldspars. Due to higher temperature and pressure, euhedral sphene a d rutile are more common in the Dala Sandstone Formation.
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