Houtz, R. E. (1975): South Tasman Basin and borderlands; a geophysical summary. Texas A & M University, Ocean Drilling Program, College Station, TX, United States, Initial Reports of the Deep Sea Drilling Project, 29 (Lyttleton, N. Z. to Wellington, N. Z.; March-April 1973), 1135-1146, georefid:1976-016995

New profiler and sonobuoy data are presented to supplement the existing geophysical data in the Tasman area. The tectonically disturbed western edge of the Campbell Plateau extends outward as a deep-sea fracture zone that separates 80 m.y. old sea floor to the east from the 30 m.y. old Emerald Basin (Site 278). A 600-m regional depth change occurs at the boundary. The effeciveness of bottom currents on sedimentation is shown on the profiler section from the Campbell Plateau and the western Tasman Sea. A possible marginal rift, now buried, can be inferred from profiler data taken from near sites 275 and 276. A widespread reflector on the plateau has been identified as being in the region of the Cenozoic/Mesozoic boundary. A normally faulted erosion surface on the South Tasman Rise corresponds with the Oligocene-Late Eocene unconformity. A large east-west graben between the South Tasman Rise and Tasmania may represent an earlier rift that predates the rifted east-west margin drilled south of the rise (Site 280). Sonobuoy refraction data reveal a somewhat atypical structure section in the Central Tasman, where a 7.1- to 7.4-km/sec layer at a depth of 7.5 km supplants the typical 6.8-km/sec oceanic layer.
West: 143.0000 East: 177.0000 North: -40.0000 South: -60.0000
West: NaN East: NaN North: NaN South: NaN
Expedition: 29
Data access:
Provider: SEDIS Publication Catalogue
Data set link: http://sedis.iodp.org/pub-catalogue/index.php?id=10.2973/dsdp.proc.29.142.1975 (c.f. for more detailed metadata)
Data download: application/pdf
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