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

Evaluation of osmium isotopes and iridium as paleoflux tracers in pelagic carbonates

“…Extensive studies on the OJP have provided information on high resolution climate record in the Quaternary (Berger et al, , 1994, sources of dust to the OJP (Krissek and Janecek, 1993;Patterson et al, 1999), variations in 3 He fluxes (Patterson and Farley, 1998) and sediment focusing (Higgins et al, 2002). Our sample depths were chosen to match those analyzed by Higgins et al (2002). However, each sample in this study represents an average of 2 cm interval in the sediment sequence compared to 4 cm in Higgins et al (2002).…”

“…Site 806 was selected because detailed studies of 3 He (Patterson and Farley, 1998) and unsupported initial 230 Th excess (xs 230 Th initial ) (Higgins et al, 2002) are available for the same site. This combination of data provides an opportunity to compare Ir concentrations with commonly used constant flux tracers ( 3 He and xs 230 Th initial ) and to test whether Ir concentrations can be used effectively to determine sediment accumulation rates.…”

Chemical Tracers of Particle Transport

“…In other regions focusing factors are generally less than the extreme cases that occur in the Southern Ocean. However, sediment focusing factors may change systematically with climate (e.g., Higgins et al, 2002;Marcantonio et al, 2001Marcantonio et al, , 1996, and this must be taken into account when interpreting accumulation rates of sedimentary material (as illustrated below with barite accumulation).…”

Flux and size fractionation of 3He in interplanetary dust from Antarctic ice core samples

“…The suggestion that late Quaternary 100,000 year climate cycles might be driven by variations in extraterrestrial dust accretion (Muller and MacDonald, 1995; 1997) stimulated a number of studies of past variations in the interplanetary dust particle (IDP) flux, using 3 He, Ir and/or Pt in marine sediments or ice as tracers of IDP input (Gabrielli et al, 2006; Winckler and Fischer, 2006;Gabrielli et al, 2004;Winckler et al, 2004;Karner et al, 2003;Higgins et al 2002;Marcantonio et al, 1999;Patterson and Farley, 1998;Farley and Paterson, 1995). Initial reports of 100 ka cyclicity in 3 He flux ( Farley and Patterson, 1995;Paterson and Farley, 1998) were later questioned based on evidence that "sediment focusing" in the ocean can create apparent variations unrelated to the primary IDP flux (Marcantonio et al, 1999;Higgins et al, 2002) and lack of evidence for such cyclicity in some records (Winckler and Fischer, 2006;Gabrielli et al, 2004;Winckler et al, 2004).…”

“…Initial reports of 100 ka cyclicity in 3 He flux ( Farley and Patterson, 1995;Paterson and Farley, 1998) were later questioned based on evidence that "sediment focusing" in the ocean can create apparent variations unrelated to the primary IDP flux (Marcantonio et al, 1999;Higgins et al, 2002) and lack of evidence for such cyclicity in some records (Winckler and Fischer, 2006;Gabrielli et al, 2004;Winckler et al, 2004). The history of accretion of extraterrestrial material is also of more general interest as a possible record of solar system events, and as a "constant-flux proxy" that may be useful for constraining sediment accumulation rates.…”