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Patterns of thermal maturity as diagnostic criteria for interpretation of melanges

¹ Monterey Bay Aquarium Research Institute, 160 Central Avenue, Pacific Grove, California 93950
² Department of Geological Sciences, University of Missouri, Columbia, Missouri 65211

Melanges are common constituents of ancient subduction complexes. Interpretations of melange genesis fall into five general categories: (1) gravitationally induced lateral spreading of the slope apron; (2) large-scale mass wasting (olistostromes); (3) subduction-driven viscous flow within "channels" at the base of the accretionary wedge; (4) diapiric injection; and (5) tectonic deformation within shear zones. interpretations are more viable when thermal-maturity data are considered along with structural and stratigraphic aspects. To document each distinct type of thermal-maturity signature, paleotemperature data must be extracted from both the matrix lithologies and the blocks of sedimentary rock within a melange, as well as from surrounding formations or structural domains.

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