Titanite low-temperature alteration and Ti mobility

David B. Tilley, Richard A. Eggleton*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    23 Citations (Scopus)


    A pseudomorphous aggregate after titanite composed of smectite, anatase and residual titanite of composition (Ca0.98,Mn0.02)(Ti0.65,Al 0.35)[SiO4](O0.65,OH 0.35), from a depth of 450 m in the Broken Hill South Mine, New South Wales, Australia, was investigated by electron microscopy and microanalysis to characterize the alteration products and the mobility of Ti. Examination of the pseudomorph showed randomly oriented anatase crystals dispersed throughout a matrix of beidellite, with 9% porosity. Around the periphery and along the (110) cleavage plane of titanite, alteration was most developed. The range of Ti mobility was found to be limited to ∼500 nm, and the ratio between the average diameter of anatase crystals and the average distance between them is ∼1.3. This ratio is consistent with an alteration process in which Ti is conserved and the anatase crystals grow from the Ti available immediately around them. It is unlikely that Ti migrated beyond the titanite pseudomorph.

    Original languageEnglish
    Pages (from-to)100-107
    Number of pages8
    JournalClays and Clay Minerals
    Issue number1
    Publication statusPublished - Feb 2005


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