Diabase variation and genesis

The uniformity of diabase composition has been interpeted as evidence of their having undergone a minimum of modification at low pressures and indicative of derivation from an homogenous source. Comparison of diabase analyses with experimentally investigated basaltic compositions in a data projection scheme suggests, contrary to this veiw, that the diabases have undergone extensive near surface fractionation. This conclusion suggests that the similarity of trace element abundances is due to a pervasive leveling by the fractionating phases in a low pressure regime.

Abstract licence: CC BY-NC

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