Tertiary sediments from the east Pacific rise
Journal Article
·
· Ann. GSA and Assoc. Soc. Mtg., San Francisco, 14 Nov 1966; (United States)
OSTI ID:5961944
Eight crossings of the East Pacific Rise have been made by the ships of the Lamont Geological Observ. of Columbia University. More than 50 pre-Pleistocene cores, ranging in age from lower Miocene to Pliocene and in length from 4 m to about 12 m, have been recovered from the crest and flanks of this feature. Pliocene cores are most common and generally occur in the crestal regions of the rise. The facts that one Pliocene core contains basalt fragments in its basal portion and that the cutting edges of several other core barrels on the crest were badly damaged suggest that the cores penetrated the entire sediment column in this area. Seismic-profile data also point to a very thin sediment cover over the crestal regions and a thickening on the flanks. Older pre- Pleistocene (Miocene) sediments generally occur on the flanks of the rise. Eocene sediments are not found anywhere near the rise but are present in fracture zones that offset the axis of this feature. Available data indicate that the East Pacific Rise as a whole is a considerably younger feature than the Mid-Atlantic Ridge. The sediment- distribution pattern over the rise indicates that some process is either (1) creating new crust, or (2) burying sediment between successive lava flows.
- Research Organization:
- Lamont Geol. Observ.
- OSTI ID:
- 5961944
- Journal Information:
- Ann. GSA and Assoc. Soc. Mtg., San Francisco, 14 Nov 1966; (United States), Journal Name: Ann. GSA and Assoc. Soc. Mtg., San Francisco, 14 Nov 1966; (United States)
- Country of Publication:
- United States
- Language:
- English
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