RE: RNS here...... have a squizz31 Mar 2021 13:19
Iceberg posted previously about historic AA findings and kpsar phenoctysts being present showing the 2nd porphyry. I thougt a recent RNS also alluded to this type of rock being found but have scanned the previous RNSs and can't find it so it may have been mentioned in an interview. Not a geologist but came across the following on the internet
'Because larger grains generally indicate longer cooling rates, the phenocrysts indicate that the magma experienced an initial phase of slow cooling deep underground. In rocks with coarse-grained groundmasses, the phase of slow cooling was followed by a phase of faster underground cooling. This could happen if the magma migrates to shallower, cooler rocks or if a volcanic eruption taps off some magma from the chamber.'
Is this why they are looking for a mechanism that allows for a deep survey.