Revised Chronology of Neogene DSDP Holes from the World Ocean

Cosmogenic nuclide evidence for minimal erosion across two subglacial sliding boundaries of the late glacial Fennoscandian ice sheet

“…At minimum this surface has survived the last two glacial cycles. Using the DSDP 607 marine benthic foraminifer oxygen isotope record Ruddiman et al, 1989;Lazarus et al, 1995) as a proxy for the approximate duration of periods of ice sheet cover (cf. Kleman and Stroeven, 1997), the penultimate ice-free period [100 to 93 ka, Marine Isotope Stage 5c;] combined with continuous exposure since last deglaciation, yields a total exposure length of~16 kyr.…”

Age and weathering status of granite tors in Arctic Finland (~68° N)

“…c Minimum burial time was calculated from 26 Al/ 10 Be ratio assuming that the sample originally experienced a long period of exposure and then was buried rapidly by ice. d Total history is based on the DSDP 607 marine oxygen isotope proxy record (Lazarus et al, 1995) using an iterative process to determine when the sample was first exposed to arrive at the present-day 10 Be and 26 Al concentrations (Finnish samples). The histories for the northern Sweden samples were derived using a cutoff value of 3.7‰ to deter mine ice-free and covered periods Stroeven et al, 2002a,b).…”

Opal sedimentation shifts in the World Ocean over the last 15 Myr

“…The references to their original opal data are as follows: DSDP Leg 8, Sites 70 and 73 [16]; Leg 38, Site 346 [17]; Leg 85, Site 574 [18]. Opal MAR was calculated by Dittert based on ages assigned to these sites [19]. The resulting opal MAR data are publicly available on the Pangaea databank (data series label: DittertN_2001.13, database ID#: 2157943).…”

“…Note the drop in opal accumulation in the North Atlantic (15 My); the repeated shifts between east -central and eastern Pacific (15 -10 My); the repeated coastal-to-offshore fractionations in California (15 -7 My); the recovery in most records around the biogenic bloom (4.5 -7 My); the fractionation to the Galapagos Basin, easternmost Pacific (4.5 My); the opal drop in the North Atlantic during the oceanic reorganizations connected to NHG (2.7 My); the establishment of opal deposition in the Southern Ocean (2 My). Opal data sources are as follows: DSDP Sites 66, 572, 586 [82]; DSDP Sites 70, 73, 346, 572, 574, ODP Site 643, compiled by Nicholas Dittert, JOIDES SCREEN core data base (http:// www.ngdc.noaa.gov/mgg/geology/dsdp/dsdpcdv2.htm), stratigraphy from [19], made publicly available at http://www.pangaea.de; ODP Sites 642, 643, 644 [83]; ODP Sites 846, 850 [8]; ODP Sites 1010, 1021 [84] ODP Site 1092 [45]. Fig.…”