Could be a few difficulties with determining that. Firstly the gravity survey responses are only shown in plan view, with no vertical slice so spod responses with depth can’t be correlated I’d guess.
Secondly IMO the specific density of the LCT pegmatite and the spod minerals within it have a very close correlation, so undetectable.So gravity really is more about detecting the LCT pegmatite from the enclosing amphibolite.
That said I did notice that at Cancet (where the peg are lobes strike easterly and dip the same) that the best spodumene results seemed to be not in the centre of the strongest gravity responses , but on the perimeter. So zonation is important factor.
WR1 Leapfroggers, page-74
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