Sediment focusing creates 100-ka cycles in interplanetary dust accumulation on the Ontong Java Plateau

Publication Type  Journal Article
Year of Publication  2002
Authors  Higgins, S. M.; Anderson, R. F.; Marcantonio, F.; Schlosser, P.; Stute, M.
Journal Title  Earth and Planetary Science Letters
Volume  203
Issue  1
Pages  383-397
Journal Date  Oct 15
ISBN Number  0012-821X
Accession Number  ISI:000179078800029
Key Words  cosmic dust; th-230; sediment supply; ontong java plateau; he-3; western equatorial pacific; extraterrestrial he-3; orbital inclination; accretion rate; sea-floor; ice ages; ocean; th-230; productivity; periodicity
Abstract  

The accumulation of extraterrestrial He-3, a tracer for interplanetary dust particles (IDPs), in sediments from the Ontong Java Plateau (OJP; western equatorial Pacific Ocean) has been shown previously to exhibit a regular cyclicity during the late Pleistocene, with a period of similar to100 ka. Those results have been interpreted to reflect periodic variability in the global accretion of IDPs that, in turn, has been linked to changes in the inclination of Earth's orbit with respect to the invariable plane of the solar system. Here we show that the accumulation in OR sediments of authigenic Th-230, produced by radioactive decay of U-234 in seawater, exhibits a 100-ka cyclicity similar in phase and amplitude to that evident in the He-3 record. We interpret the similar patterns of Th-230 and He-3 accumulation to reflect a common origin within the ocean-climate system. Comparing spatial and temporal patterns of sediment accumulation against regional patterns of biological productivity and against the well-established pattern of CaCO3 dissolution in the deep Pacific Ocean leads to the further conclusion that a common 100-ka cycle in accumulation of biogenic, authigenic and extraterrestrial constituents in OR sediments reflects the influence of climate-related changes in sediment focusing, rather than changes in the rate of production or supply of sedimentary constituents. (C) 2002 Elsevier Science B.V. All rights reserved.

Notes  

612MATimes Cited:12Cited References Count:41

URL  <Go to ISI>://000179078800029
DOI  Pii S0012-821x(02)00864-6