Very-low-grade Metamorphism

Willner, Arne P.

doi:10.1016/b978-0-08-102908-4.00002-3

Cited by 2 publications

(1 citation statement)

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“…However, the available data about their metamorphism are scarce and mainly derived from T estimates of the metamorphic peak from illite and chlorite crystallinity [30][31][32][33][34][35][36][37] and from analyses of the carbonaceous material [31,38,39], whereas the P conditions remain largely undetermined. This is due to the very low kinetics during low-T condition reactions that makes chemical equilibria rarely achieved at the whole rock scale [40], thus hampering the unambiguous constraint of the P-T conditions of metamorphism [41][42][43]. In addition, it is specifically difficult to assess metamorphic peaks in metasedimentary rocks, since the high content of detrital minerals in relict phases makes effective rock composition largely questionable and unreliable in terms of building isochemical phase diagrams, i.e., pseudosections [44,45].…”

Section: Introductionmentioning

confidence: 99%

Insights into the Subduction of the Ligure-Piemontese Oceanic Basin: New Constraints from the Metamorphism in the Internal Ligurian Units (Northern Apennines, Italy)

Sanità,

Di Rosa,

Marroni

et al. 2024

Minerals

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In the Northern Apennines, the Internal Ligurian Units are considered deformed and metamorphosed fragments of the Ligure-Piemontese oceanic basin. In this paper, we report on the temperature and pressure conditions of the metamorphic peak for four Internal Ligurian Units, estimated using different geothermometers and geobarometers based on the white mica and chlorite compositions. These minerals were formed during the D1 deformation phase in the pre-Oligocene. The results indicate that the Portello and Gottero units are both characterized by metamorphic conditions pertaining to low blueschists facies, while the Colli-Tavarone and Bracco-Val Graveglia Units show a lower metamorphic imprint that produces assemblages of prehnite-pumpellyite facies. The estimated geothermal gradient for the metamorphic peak achieved by the analyzed Internal Ligurian Units during the D1 phase is 7–15 °C/Km, which is indicative of deformation in a subduction setting. Under these conditions, the D1 phase developed in these units as a result of underplating at the base of the accretionary wedge during the closure of the Ligure-Piemontese basin. These data indicate a close geodynamic correlation among the Internal Ligurian Units and the ophiolite-bearing units of the Alps.

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