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Actvity Summary: This core came from a site located at the base of the trench slope of the Chile Trench where the Chile Ridge is being subjected.

To borrow core replica, contact Nicole Kurtz at nkurtz@LDEO.columbia.edu


Faulted claystone, silty claystone, sandy silty claystone from late Pleistocene subunit IIC recovered from hole B at Site 863.  This site is located at the base of the trench slope of the Chile Trench where the Chile Ridge is being subducted.  One of the objectives of drilling at this site was to identify the structural fabrics and deformation caused by rift subduction.

Site 863 drilling was designed to address the following structural problem:

To analyze the deformation and structural fabrics of the sediments at the toe of the accretionary wedge. This is to investigate the relation of these fabrics to the plate kinematic framework, and the geometrical modifications the accretionary wedge has to undergo in the process of emplacement onto the active Chile spreading ridge. The site is just 2 km east of the trench and situated above where the Taitao Ridge is subducting.