Climatic influences on the growth rates of Mn crusts during the Late Quaternary

Details Climatic influences on the growth rates of Mn crusts during the Late Quaternary Climatic influences on the growth rates of Mn crusts during the Late Quaternary

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992e%26psl.109...25e&link_type=abstract

Earth and Planetary Science Letters, Volume 109, Issue 1-2, p. 25-36.

Computer Science

14

Scientific paper

The concentration of 230Th in Mn crust VA13-2 (146°W, 9°25'S, 4830 m) from the Pacific Ocean was measured with high depth resolution (0.02 mm) to a depth of 1.4 mm corresponding to an age of ~226 ka B.P. The mean growth rate estimated from these results is 6.2 +/- 0.4 mm/Ma. However, the exponential curve obtained shows two drastic events in the 230Th concentration record with durations of 41 +/- 4 ka and 37 +/- 6 ka which are interpreted as growth standstills. The decay-corrected 230Th concentration is inversely correlated with those of Mn, Fe and Co indicating that the 230Th flux into the crust has been constant throughout time and that the observed fluctuations in 230Th are due to dilution by the main components. By applying a constant 230Th flux model, high-resolution growth rates were derived from every sample investigated. A detailed comparison of the growth pattern with the SPECMAP time table reveals that the VA13-2 growth rates tend to be higher during interglacial than during glacial periods. In particular, the observed growth standstills are associated with glacial stages 6 and 8. Further investigation of Mn crust 72 DK 9 taken from shallower water (170°35'W, 20°13'N, 1550 m) tend to confirm that there is a link between the growth rates of hydrogenetic crusts and the climate of the Late Quaternary.

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