What are the prospects of analysing oxygen isotope ratios of quartz from Precambrian granitoids? Is it useful despite that a granitoid suite is the product of magmatic differentiation? Moreover there are also chances of resetting by metamorphism. So, what are the odds of tracing original magma type (I, or Stype) from oxygen isotope of quartz in Precambrian granitoids?
The question you raised has also recently come to my attention. A core is why the oxygen isotopic composition of quartz is tested instead of zircon. Ideally, you will get similar results to those of zircon, but in the worst case, quartz may be subjected to alteration. This post-crystallization effect may get some information through laser fluorination, and SIMS O may be powerless to do anything about it. As for the discrimination of rock types, I think quartz is not a good test object.
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