| Zircon
is contained in igneous rocks, metamorphic rock and sedimentary
rock, as a sub-component mineral or as one of the main heavy minerals.(Fig.9) |
 |
| Fig.9 |
| It
is difficult to classify geological formation when source rock structure
in core & cuttings is lost due to strong alteration. |
| Zircon
is not affected by acid or alkaline hot water, thus it remains a
stable mineral even in geothermal environments. |
| Also,
it is known that the form of crystal and its content do change from
one geological formation to other. |
| Therefore,
through the analysis of the amount and form of zircon crystals it
possible to estimate the source rock and to do classifications of
strong altered core & cuttings. |
 |
 |
| Fig.10 |
|
| In
this method the program developed by Hayashi(1990) is used to analyze
the form of zircon crystals. |
