Short Scientific Communication

Bulletin of Volcanology

, Volume 71, Issue 6, pp 705-710

First online:

Accumulation rates of volcaniclastic deposits on Loihi Seamount, Hawaii

  • David A. ClagueAffiliated withMonterey Bay Aquarium Research Institute Email author 

Rent the article at a discount

Rent now

* Final gross prices may vary according to local VAT.

Get Access


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.


Loihi Seamount Hawaiian volcanism Volcaniclastic deposits AMS radiocarbon ages