Farley, Kenneth A; Vokrouhlicky, David; Bottke, William; Nesvorny, David (2006): Helium concentrations of late Miocene sediments [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.769831, Supplement to: Farley, KA et al. (2006): A late Miocene dust shower from the break-up of an asteroid in the main belt. Nature, 439(7074), 295-297, https://doi.org/10.1038/nature04391
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Abstract:
Throughout the history of the Solar System, Earth has been bombarded by interplanetary dust particles (IDPs), which are asteroid and comet fragments of diameter 1-1,000 µm. The IDP flux is believed to be in quasi-steady state: particles created by episodic main belt collisions or cometary fragmentation replace those removed by comminution, dynamical ejection, and planetary or solar impact. Because IDPs are rich in 3He, seafloor sediment 3He concentrations provide a unique means of probing the major events that have affected the IDP flux and its source bodies over geological timescales (Farley et al., 1998, doi:10.1126/science.280.5367.1250; Takayanagi and Ozima, 1987, doi:10.1029/JB092iB12p12531; Farley, 1995, doi:10.1038/376153a0; Kortenkamp and Dermott, 1998, doi:10.1126/science.280.5365.874). Here we report that collisional disruption of the >150-km-diameter asteroid that created the Veritas family 8.3 +/- 0.5 Myr ago (Nesvorny et al., 2003, doi:10.1086/374807) also produced a transient increase in the flux of interplanetary dust-derived 3He. The increase began at 8.2 +/- 0.1 Myr ago, reached a maximum of 4 times pre-event levels, and dissipated over 1.5 Myr. The terrestrial IDP accretion rate was overwhelmingly dominated by Veritas family fragments during the late Miocene. No other event of this magnitude over the past 10**8 yr has been deduced from main belt asteroid orbits. One remarkably similar event is present in the 3He record 35 Myr ago, but its origin by comet shower (Farley et al., 1998, doi:10.1126/science.280.5367.1250) or asteroid collision (Tagle and Claeys, 2004, doi:10.1126/science.1098481) remains uncertain.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -6.652435 * Median Longitude: 22.636600 * South-bound Latitude: -17.024000 * West-bound Longitude: -42.908400 * North-bound Latitude: 3.719130 * East-bound Longitude: 88.181600
Date/Time Start: 1988-06-01T11:00:00 * Date/Time End: 1994-02-25T19:00:00
Event(s):
121-757B * Latitude: -17.024000 * Longitude: 88.181600 * Date/Time Start: 1988-06-01T11:00:00 * Date/Time End: 1988-06-04T06:15:00 * Elevation: -1663.0 m * Penetration: 374.8 m * Recovery: 271.94 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg121 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 43 cores; 374.8 m cored; 0 m drilled; 72.6 % recovery
154-926B * Latitude: 3.719130 * Longitude: -42.908400 * Date/Time Start: 1994-02-21T10:30:00 * Date/Time End: 1994-02-25T19:00:00 * Elevation: -3610.0 m * Penetration: 605.8 m * Recovery: 593.25 m * Location: North Atlantic Ocean * Campaign: Leg154 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 64 cores; 605.8 m cored; 0 m drilled; 97.9 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
Download Data
Datasets listed in this publication series
- Farley, KA; Vokrouhlicky, D; Bottke, W et al. (2006): Helium concentrations of ODP Hole 121-757B. https://doi.org/10.1594/PANGAEA.769829
- Farley, KA; Vokrouhlicky, D; Bottke, W et al. (2006): Helium concentrations of ODP Hole 154-926B. https://doi.org/10.1594/PANGAEA.769830