Interdisciplinary lithosphere-to-hydrosphere representation of Endeavour Segment. This image shows the surface bathymetry underlain by multichannel seismic results from Carbotte et al. (2002) and Van Ark et al. (2007). For ease in viewing and graphical representation, the along-axis transect has been moved slightly to the east of the ridge axis; the white dashed line indicates the location of the along-axis survey line within the axial rift. A magma chamber reflector is found beneath all five of the vigorously venting hydrothermal fields (red triangles), as well as beneath the newly discovered Stockwork system to the far south, which is underlain by another strong reflector defined by Van Ark et al. (2007). The magma chamber near the inflated, shallowest section of the ridge shoals to a depth of ~ 2.1 km beneath the seafloor and deepens significantly to the south to a depth of 3.3 km (Van Ark et al., 2007). Differences in seismic reflection indicate that the magma chamber is composed of about four sections. The red circles show the hypocenters for double-difference locations lying within 1 km of the location of the seismic profile (Wilcock et al., 2009) (see Endeavour_quakes.mov). Also shown are inferred patterns of upflow and downflow (arrows) as first described by Delaney et al. (1997). The three panels projected above the spreading center show the objectively mapped potential temperature anomaly sections resulting from repeat hydrography surveys in the summers of 2004–2006 (Kellogg and McDuff, 2010). Historically, the Main Endeavour and High Rise hydrothermal fields have yielded the largest and most intense buoyant plumes, corresponding to the largest and most vigorously venting hydrothermal structures and the most intense seismic activity. Also shown is an image of the 380°C hydrothermal vent Sully, hosting a vibrant tubeworm community.
Media Type: Map
Investigator: Deborah Kelley