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Titanian clinohumite and chondrodite in antigorite serpentinites from Central Chile: evidence for deep and cold subduction
Departamento de Mineralogía y Petrología (Universidad de Granada), Facultad de Ciencias, Spain.
Instituto de Ciencias de la Tierra, Universidad Austral de Chile, Valdivia, Chile.
Department of Geology and Andean Geothermal Center of Excellence (CEGA), Universidad de Chile, Santiago, Chile.
Géosciences Montpellier, CNRS and Univ. Montpellier (UMR5243), Montpellier, France.
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2017 (English)In: European journal of mineralogy, ISSN 0935-1221, E-ISSN 1617-4011, Vol. 29, no 6, p. 959-970Article in journal (Refereed) Published
Abstract [en]

Humite minerals, including Ti-rich, hydroxyl-dominant chondrodite and clinohumite, occur in Paleozoic antigorite serpentinite in the La Cabaña area, in the Chilean Coastal Cordillera (~38° 30 ′ S–73° 15 ′ W). This may be the first report from South America. Humite minerals are intergrown with Mn-rich olivine hosting antigorite blades in textural equilibrium, indicating a metamorphic origin. A comparison with previous results from piston-cylinder experiments and petrological studies of other high-P serpentinites constrains the formation conditions of the humite + olivine + antigorite assemblage to ca. 2.0–2.5 GPa and <600°C. Thus, the assemblage is interpreted as having formed during cold subduction of a segment of oceanic lithosphere to a depth >60 km, suggesting that the Paleozoic serpentinites were entrained into the mantle at higher P T conditions than those experienced by the spatially associated olivine–lizardite metadunites and enclosing metasedimentary rocks (subducted to < 30 km). During exhumation along the subduction channel, high- P serpentinites together with metadunites underwent tectonic mingling with metasediments of the accretionary prism, preserving their signature of distinct metamorphic trajectories. This could be similar to the tectonic evolution of blueschists and high-P amphibolites found as isolated blocks in the metasediments of the Chilean Coastal Cordillera.

Place, publisher, year, edition, pages
E. Schweizerbart'sche Verlagsbuchhandlung, 2017. Vol. 29, no 6, p. 959-970
Keywords [en]
hydroxylchondrodite, hydroxylclinohumite, Ti-clinohumite, Ti-chondrodite, humite group, metamorphic olivine, antigorite serpentinite, high pressure, subduction, La Cabaña, Chilean Coastal Cordillera
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Geology
Identifiers
URN: urn:nbn:se:ltu:diva-70992DOI: 10.1127/ejm/2017/0029-2668Scopus ID: 2-s2.0-85041858425OAI: oai:DiVA.org:ltu-70992DiVA, id: diva2:1251164
Available from: 2018-09-26 Created: 2018-09-26 Last updated: 2018-10-03Bibliographically approved

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