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Deep-sea volcaniclastic sedimentary systems: an example from La Fournaise volcano, Réunion Island, Indian Ocean by Ollier; Cochonat; Lénat; Labazuy is a Earth and Planetary Sciences article available to read on EtoBox.

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A volcaniclastic sedimentary fan extending to water depths of 4000 m is characterized using gravity cores, camera surveys, high‐resolution sonar images, seismic records and bathymetry from the submarine portion of La Fournaise volcano, Réunion Island, a basaltic shield volcano in the SW Indian Ocean. Three main areas are identified from the study: (1) the proximal fan extending from 500 m water depth down to 2000 m water depth; (2) the outer fan extending from 2000 m water depth down to 3600 m water depth; (3) the basin extending beyond 3600 m water depth. Within these three main areas, seven distinct submarine environments are defined: the proximal fan is characterized by volcanic basement outcrops, sedimentary slides, deep‐water deltas, debris‐avalanche deposits, and eroded floor in the valley outlets; the outer fan is characterized by a discontinuous fine‐grained sedimentary cover overlying coarse‐grained turbidites or undifferentiated volcanic basement; the basin is characterized by hemipelagic muds and fine‐grained turbidites interbedded with sandy and gravelly turbidite lobes. The evolution of the deep‐sea volcaniclastic fan is strongly influenced by sector collapses, such as

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Author

Ollier; Cochonat; Lénat; Labazuy

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley (ISSN 1469-3496)

Published

1998

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)