Scheidegger, Kenneth F; Kulm, LaVerne D (1975): (Table 2) Analyses of prominent ash layers recovered at DSDP Site 18-178, Gulf of Alaska [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.720969
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Abstract:
A sequence of ash layers recovered from site 178 of the Deep Sea Drilling Project in the Gulf of Alaska was studied to determine the nature of highly explosive volcanic eruptions associated with the Aleutian Arc and Alaskan Peninsula during the last 8 m.y. The major-element chemistry of 25 distinct ash layers was determined. When the analyses are plotted on conventional major-element variation diagrams, the unusual, highly evolved, calc-alkalic characteristics of the ashes are apparent. Perhaps more significantly, there is a good correlation of certain indices of the degree of chemical evolution of each ash (SiO2 content and Larsen index) with sample age. Both parameters vary cyclically, with maximum values of both indices occurring at present, 2.5, and about 5.0 m.y. ago. The cause of the cyclic activity, as well as discontinuous volcanic activity reported for other areas by other investigators, is not precisely known. However, we suggest that variable rates of subduction provide a viable hypothesis for discontinuous volcanic activity associated with convergent plate boundaries.
Related to:
Scheidegger, Kenneth F; Kulm, LaVerne D (1975): Late Cenozoic volcanism in the Aleutian Arc: Information from ash layers in the northeastern Gulf of Alaska. Geological Society of America Bulletin, 86(10), 1407-1412, https://doi.org/10.1130/0016-7606(1975)86%3C1407:LCVITA%3E2.0.CO;2
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Latitude: 56.956300 * Longitude: -147.131000
Date/Time Start: 1971-06-30T00:00:00 * Date/Time End: 1971-06-30T00:00:00
Minimum DEPTH, sediment/rock: 3.895 m * Maximum DEPTH, sediment/rock: 461.250 m
Event(s):
18-178 * Latitude: 56.956300 * Longitude: -147.131000 * Date/Time: 1971-06-30T00:00:00 * Elevation: -4218.0 m * Penetration: 794.5 m * Recovery: 212.5 m * Location: North Pacific/PLAIN * Campaign: Leg18 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 53 cores; 471.5 m cored; 48 m drilled; 45.1 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 2 | Sample code/label | Sample label | Scheidegger, Kenneth F | DSDP/ODP/IODP sample designation | ||
| 3 | Silicon dioxide | SiO2 | % | Scheidegger, Kenneth F | Colorimetry | |
| 4 | Aluminium oxide | Al2O3 | % | Scheidegger, Kenneth F | Atomic absorption spectrometry (AAS) | |
| 5 | Iron oxide, FeO | FeO | % | Scheidegger, Kenneth F | Atomic absorption spectrometry (AAS) | total Fe as FeO |
| 6 | Magnesium oxide | MgO | % | Scheidegger, Kenneth F | Atomic absorption spectrometry (AAS) | |
| 7 | Calcium oxide | CaO | % | Scheidegger, Kenneth F | Atomic absorption spectrometry (AAS) | |
| 8 | Sodium oxide | Na2O | % | Scheidegger, Kenneth F | Atomic absorption spectrometry (AAS) | |
| 9 | Potassium oxide | K2O | % | Scheidegger, Kenneth F | Atomic absorption spectrometry (AAS) | |
| 10 | Titanium dioxide | TiO2 | % | Scheidegger, Kenneth F | Atomic absorption spectrometry (AAS) | |
| 11 | AGE | Age | ka BP | Geocode |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
216 data points