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Photosgranites and the nature of proof

12th Oct 2019 01:52 UTCTony Peterson Expert

EDIT: Photo link added

I'd avoid saying any observation in geology can be offered as "proof"......the cumbersome, but to me best phrase is, "is consistent with..........." or "does not contradict.....". Proofs were things I saw in linear algebra.

This slab, and the outcrop it came from, may "be consistent with" both models you suggest! There is no reason why granites, surely the messiest systems an igneous petrologist gets to deal with, cannot be sourced both from a deeper locale and the inclusions they partially melt and digest along the way.  At least, you're not proposing in situ granitization

12th Oct 2019 02:04 UTCPaul Brandes Manager

What slab, and what is this in reference to? :/

12th Oct 2019 05:05 UTCFrank K. Mazdab Manager

the comment appears to refer to the POTD, 12 October 2019.

12th Oct 2019 12:15 UTCRalph Bottrill Manager

Tony has a point about proof in geology often being very subjective, though the title of the picture reads “...used as proof...”, which suggests  it’s open to question to the uploader.

12th Oct 2019 18:44 UTCGareth Evans


Proof in Geology! It is all too confusing for me, probably the reason I majored in Chemistry and Physics. :)


12th Oct 2019 18:55 UTCJolyon Ralph Founder


12th Oct 2019 14:26 UTCPaul Brandes Manager

Ok, I see now. But, it would have been nice to start this discussion from the photo itself rather than a stand alone thread.

12th Oct 2019 17:10 UTCUwe Kolitsch Manager

Photo link added to original message.

12th Oct 2019 19:07 UTCPaul Brandes Manager

Thanks Uwe.
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