Accession Number:

ADA625836

Title:

Study of Deep-Sea Furrows: Physical Characteristics, Mechanisms of Formation and Associated Environmental Processes

Descriptive Note:

Annual rept.

Corporate Author:

TEXAS A AND M UNIV COLLEGE STATION DEPT OF OCEANOGRAPHY

Personal Author(s):

Report Date:

2001-09-30

Pagination or Media Count:

4.0

Abstract:

A field of sedimentary furrows was discovered on the abyssal plain at the base of the Sigsbee Escarpment during a 1999 deep-tow survey of the continental slope in the Bryant Canyon area of the northwestern Gulf of Mexico. The furrows are long, relatively narrow depressions in the seafloor that are generally oriented parallel to the escarpment. Furrows associated with deep-water currents have been found along the Blake Bahama Outer Ridge Hollister et al., 1974 Lonsdale and Spiess, 1977 Tucholke, 1979 Flood and Hollister, 1980 Flood, 1983, the Bermuda Rise Embley et al., 1980, and several other localities see review by Flood, 1983. Though such observations exist, they have by necessity been limited to relatively small areas and only few individual furrows have been studied in detail. The massive areal extent of Sigsbee Escarpment furrow field 10,000 km2 and the detail with which the field has been imaged are unprecedented. Their character indicates the occurrence of previously unrecognized strong bottom water flow in the gulf and it highlights the important influence flow has on slope and rise sedimentary processes. Many questions about the nature of the furrows and their relationships to currents and other environmental processes exit. For example What are the dimensions and morphologic features of the furrows What is their mechanism of formation What is their significance for the lower sloperise sedimentary processes What is the nature and cause of associated water flow As a first step toward answering such questions, we have begun examining existing 3-D seismic data and deep-tow data.

Subject Categories:

  • Physical and Dynamic Oceanography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE