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- adj. Having unstable thermal stratification
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At about -400 metres, a polymictic agglomerate unit also appears, showing singular fragments of margin-chilled rhyolite, fragments of rhyolitic welded tuffs and fragments of devitrified felsic glass, all evidence of hot, and therefore near-source, deposition.
Furthermore, the deepest holes show a significant increase in the intensity and thickness of the black chlorite alteration, as well as a marked thickening of the felsic volcanic units, along with the appearance of a polymictic agglomerate unit; these are well-recognized indicators of an increasingly proximal volcanogenic massive sulphide geological environment.