Titanian clinohumite and chondrodite in antigorite serpentinites from Central Chile: evidence for deep and cold subduction

  title={Titanian clinohumite and chondrodite in antigorite serpentinites from Central Chile: evidence for deep and cold subduction},
  author={Jos{\'e} Mar{\'i}a Gonz{\'a}lez-Jim{\'e}nez and Ga{\"e}lle Plissart and Leonardo N.F. Garrido and Jos{\'e} Alberto Padr{\'o}n-navarta and Thomas Aiglsperger and Rurik Romero and Claudio Marchesi and Antonio Jesus Moreno-Abril and Martin Reich and Fernando Barra and Diego Morata},
  journal={European Journal of Mineralogy},
Humite minerals, including Ti-rich, hydroxyl-dominant chondrodite and clinohumite, occur in Paleozoic antigorite serpentinite in the La Cabana 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… 
Tectono-Metamorphic Evolution of Serpentinites from Lanzo Valleys Subduction Complex (Piemonte—Sesia-Lanzo Zone Boundary, Western Italian Alps)
In the upper Tesso Valley the folded contact between Piemonte Zone ophiolites and Sesia-Lanzo Zone continental crust is exposed. Here serpentinites, metabasites, calcschists and fine-grained gneisses
Tectono-metamorphic evolution of UHP Zermatt-Saas serpentinites: a tool for vertical palaeogeographic restoration
ABSTRACT Within the Zermatt-Saas Zone (ZSZ, northwestern Alps), Ti-chondrodite- and Ti-clinohumite-bearing assemblages in serpentinites indicate UHP conditions. Multiscale structural analysis (1:20
Timing the tectonic mingling of ultramafic rocks and metasediments in the southern section of the coastal accretionary complex of central Chile
ABSTRACT Uranium-lead ages are reported for zircons from ultramafic bodies and metamorphic host rocks of the Western Series that outcrop at La Cabaña, in the southern section of the coastal
UHP Ti-chondrodite in the Zermatt-Saas serpentinite: Constraints on a new tectonic scenario
Abstract We focus on the key role of different Ti-humite minerals in subducted serpentinites as possible indicators of extreme pressure conditions. The occurrence of Ti-chondrodite and/or
The rise and demise of deep accretionary wedges: A long-term field and numerical modeling perspective
Several decades of field, geophysical, analogue, and numerical modeling investigations have enabled documentation of the wide range of tectonic transport processes in accretionary wedges, which


UHP Metamorphism Documented in Ti-chondrodite- and Ti-clinohumite-bearing Serpentinized Ultramafic Rocks from Chinese Southwestern Tianshan
The southwestern Tianshan (China) metamorphic belt records high-pressure (HP) to ultrahigh-pressure (UHP) conditions corresponding to a cold oceanic subduction-zone setting. Serpentinites enclosing
Petrology of titanian clinohumite and olivine at the high-pressure breakdown of antigorite serpentinite to chlorite harzburgite (Almirez Massif, S. Spain)
Rocks of the Cerro del Almirez ultramafic massif (Sierra Nevada, Betic Cordillera, S. Spain) record the high-pressure dehydration of antigorite–olivine serpentinite to form chlorite harzburgite (ol +
Interaction of deformation and metamorphism during subduction and exhumation of hydrated oceanic mantle: Insights from the Western Alps
Petrological investigations supported by multi‐scale structural analysis of eclogitized serpentinite in the Zermatt–Saas Zone of the Western Alps allows for the determination of mineral assemblages
Mg-metasomatism of oceanic gabbros and its control on Ti-clinohumite formation during eclogitization
Abstract In the high-pressure meta-ophiolites of Western Liguria (Italy), serpentinized ultramafites host bodies of eclogite, metarodingite and Ti-clinohumite ± Ti-chondrodite-bearing rocks. The
Pressure–Temperature Evolution of a Late Palaeozoic Paired Metamorphic Belt in North–Central Chile (34°–35°30′S)
In the Chilean Coastal Cordillera, two units, the Western and Eastern Series, constitute coeval parts of a Late Palaeozoic paired metamorphic belt dominated by siliciclastic metasediments. The
Geodynamic implications of ophiolitic chromitites in the La Cabaña ultramafic bodies, Central Chile
Chromitites (>80% volume chromite) hosted in two ultramafic bodies (Lavanderos and Centinela Bajo) from the Palaeozoic metamorphic basement of the Chilean Coastal Cordillera were studied in terms of
Titanian hydroxyl-clinohumite: Formation and breakdown in antigorite rocks (Malenco, Italy)
Petrographic evidence is presented for the breakdown of titanian hydroxyl-clinohumite to olivine+magnesian ilmenite (or geikielite)±magnetite in the outermost zone of the Bergell aureole in the