Sir, I think I am not the guy you wanted to mail to. I am by the way,
a student of metamorphic petrology and work under guidance of Dr S
Karmakar in Jadavpur University, Kolkata, India. So, please
rectification of your sent mail address needed. Thanking you.

                           Yours Faithfully,

                            Tamoghna Saha

On Mon, Jul 11, 2011 at 10:46 AM, Bottrill, Ralph (DIER)
<[log in to unmask]> wrote:
> We have been working on the metamorphic rocks hosting the Savage River
> magnetite deposits, and have found some disagreement about the interpretation
> of some albite-rich cataclastic rocks in the footwall. The metamorphics are
> mostly metamafics, quartzites, dolostones/magnesitestones, amphibolites and
> various muscovite and chlorite schists and skarns.
>
> The albitites have a variety of textures. Some are very fine grained
> and grains are mostly simply twinned or untwinned, typical of metamorphic albite
> (e.g.  photo 1). Some have coarse grains in a fine matrix (eg. fig 2), which
> some have interpreted as porphyritic felsic volcanics, and others as sheared
> porphyroblasts or disaggregated veins. The immobile elements Ti/Zr etc suggest
> an origin from sodic alteration of associated pelites and other metasediments.
>
> But there are also some small (<1m wide) cross-cutting coarse zones,
> interpreted by some as granitoids, which are more Zr-rich - these
> typically contain some quartz and show myrmekitic textures (fig. 3).
> Some of the coarse plagioclase in these bodies shows microcline-like
> Twinning (Fig. 4), suggested by some to be plagioclase replacing microcline(?)
> I have wondered if these coarse zones could be be zones of recrystallised
> cataclasites or zones of partial melting? With remobilised Zr? The rocks
> locally contain calcic to sodic amphiboles and diopside, with maximum
> temperatures to about 600-700oC (magnetite-ilmenite).
>
>
> Has anyone seen similar textures in cataclasites, or have any other thoughts on the origins
> of these rocks?
>
>
> regards
> Ralph Bottrill
> Senior Geologist, Mineralogist and Petrologist
> Metallic Minerals & Geochemistry
> Mineral Resources Tasmania
> PO Box 56, Rosny Park TAS 7018
> Phone: 61 3 6233 8359, Fax:  61 3 6233 8338
> Email: [log in to unmask]  or: [log in to unmask]
>
>
>
>
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