Distribution of volcanic ash reflectors in the eastern equatorial Pacific Ocean

Author(s): Lin, Thomas Tung-Hung; Ledbetter, Michael T.
Author Affiliation(s): Primary:
Univ. Ga., Dep. Geol., Athens, GA, United States
Volume Title: Marine Geology
Source: Marine Geology, 59(1-4), p.251-269. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0025-3227 CODEN: MAGEA6
Note: In English. 15 refs.; illus. incl. 3 tables, sketch maps
Summary: Twelve discrete reflectors within 40 m of the seafloor may be traced in the region. Shallow (<20 m) seismic reflectors can be correlated to ash layers in piston cores. In addition, deeper seismic reflectors (>20 m) can be correlated with ash layers in two DSDP cores and used to indirectly establish that all seismic reflectors in this study are ash layers. Based on areal distribution patterns, most seismic reflectors indicate the direction of possible volcanic sources. Moreover, using an assumed constant sedimentation rate of 3 CM × 103 yr-1, the average estimated age of each reflector can be calculated. All ash reflectors are Quaternary in age. Reflectors 1 to 3 are correlated to marine ash layers "D", "I", and "L", and the assigned ages correlate well with the previously established ages of 83,000, 133,000 and 230,000 yrs B.P., respectively, for these layers. Modified journal abstract.
Year of Publication: 1984
Research Program: DSDP Deep Sea Drilling Project
Key Words: 07 Marine Geology and Oceanography; Acoustical methods; Cenozoic; Central America; Cores; East Pacific; Equatorial Pacific; Eruptions; Geophysical methods; Geophysical surveys; Marine sediments; Mexico; North American Pacific; North Pacific; Northeast Pacific; Pacific Ocean; Provenance; Quaternary; Sedimentation; Sediments; Seismic methods; South America; Surveys; Volcaniclastics; Volcanism; Volcanology; Wind transport
Coordinates: N020000 N120000 W0800000 W0950000
Record ID: 1984050819
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute.