Alkali lamprophyre dykes of southern Amlash
have been injected into the upper Cretaceous limestones
and pillow lavas without any special trend. Based on this
research the following results obtained:
1- On the basis of Mg, Fe, Ti, Al contents, three different
types of mica has been identified.
A: Mg enriched biotite as the first generation.
B: Ti enriched biotite as the second one.
C: Fe-Ti enriched biotite as the third generation.
2- The pyroxenes are diopside and they crystallized in three
separate stages. The second generation of pyroxenes have
high Ti, Fe, and they formed the fine matrix and the rims of
pyroxenes of the first generation.
The abundance of large crystals of biotite within these dykes
make them economically valuable and can be excavated as
biotite mine. Probable reserve of the mineral deposit, with
respect to surface discoveries is estimated to be 7500 tons.
These dykes haven't been reorted in any other places of
Iran and they studied in this area for the first time.
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