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By correlating sphene compositions to metamorphic or hydrothermal reactions, age determinations on sphene can be used to directly date metamorphism, deformation, and hydrothermal alteration.

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These rocks have the high Ca/Al ratios wherein sphene is stabilized relative to ilmenite quartz or ilmenite anorthite.

In metamorphic rocks, sphene is stable to the highest temperatures in mafic and calc-silicate rocks.

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Because sphene reacts readily during metamorphism, U–Pb sphene ages are likely to yield the age of metamorphic crystallization, rather than resetting by simple diffusion.

For this reason, metamorphic sphene may yield complex U–Pb systematics that contain information on the whole metamorphic history of the rock.

These low-U sphenes are most commonly found in weakly metamorphosed metabasites.

Strategies to extract age information from sphene with moderate initial U/common Pb ratios include estimation of common Pb isotopic composition of sphene from coexisting low-U phases, use of U–Pb and Pb–Pb isochron plots, and step-wise leaching methods to improve Pb spread.

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