Accumulation rates of volcaniclastic deposits on Loihi Seamount,Hawaii |
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Authors: | David A Clague |
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Institution: | (1) Monterey Bay Aquarium Research Institute, 7700 Sandholdt Road, Moss Landing, CA 95039, USA |
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Abstract: | AMS radiocarbon age dating of planktonic foraminifera in volcaniclastic deposits on Loihi Seamount yields ages ranging from
590 years before present (y BP) at 10 cm depth to 5,880 y BP at 1,007 cm depth in an 11-m-thick section exposed along inward
facing, caldera-bounding faults on the eastern side of Loihi’s summit. The accumulation rate of the deposit was about 0.37 cm/y
from 5,880 to 3,300 y BP and it consisted of subequal amounts of alkalic and tholeiitic fragments. The rate slowed dramatically
at about 3,300 y BP to an average 0.04 cm/y and the particles that have accumulated since consist mostly of alkalic glass
fragments. The decrease in accumulation rate could indicate a decrease in volcanic activity at Loihi beginning about 3,300
y BP. This lower level of activity appears to be continuing today. |
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Keywords: | Loihi Seamount Hawaiian volcanism Volcaniclastic deposits AMS radiocarbon ages |
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