skip to content

Acton, Gary D.

Overview
Works: 24 works in 28 publications in 1 language and 24 library holdings
Classifications: QE39,
Publication Timeline
Key
Publications about Gary D Acton
Publications by Gary D Acton
Most widely held works by Gary D Acton
Antarctic glacial history and sea-level change : sites 1095-1103, 5 February-9 April 1998 by Ocean Drilling Program( Book )
2 editions published between 1999 and 2002 in English and held by 2 libraries worldwide
Proceedings of the Ocean Drilling Program. B : Scientific results ( Book )
in English and held by 2 libraries worldwide
Magnetostratigraphy of ODP Leg 178 holes, supplementary data to: Acton, Gary D; Guyodo, Yohan; Brachfeld, Stefanie A (2002): Magnetostratigraphy of sediment drifts on the continental rise of West Antarctica (ODP Leg 178, Sites 1095, 1096, and 1101). In: Barker, P.F., Camerlenghi, A., Acton, G.D., and Ramsay, A.T.S. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 178, 1-61 by Gary D Acton( Computer File )
in English and held by 1 library worldwide
We present revised magnetostratigraphic interpretations for Ocean Drilling Program Sites 1095, 1096, and 1101, cored in sediment drifts located off the Pacific margin of the Antarctic Peninsula. The revised interpretations incorporate a variety of observations and results obtained since the end of Leg 178, of which the most significant are new paleomagnetic measurements from U-channel samples, composite depth scales that allow stratigraphic correlation between multiple holes cored at a site, and revised biostratigraphic interpretations. The U-channel data, which include more than 102,000 paleomagnetic observations from more than 13,400 intervals along U-channel samples, are included as electronic files. The magnetostratigraphic records at all three sites are consistent with sedimentation being continuous over the intervals cored, although the data resolution does not preclude short hiatuses less than a few hundred thousand years in duration. The magnetostratigraphic records start at the termination of Subchron C4Ar.2n (9.580 Ma) at 515 meters composite depth (mcd) for Site 1095, at the onset of Subchron C3n.2n (4.620 Ma) at 489.68 mcd for Site 1096, and at the onset of Subchron C2An.1n (3.040 Ma) at 209.38 meters below seafloor for Site 1101. All three sites provide paleomagnetic records that extend upward through the Brunhes Chron
Magnetic hysteresis parameters of ODP Site 178-1096 (Table T1), supplementary data to: Brachfeld, Stefanie A; Guyodo, Yohan; Acton, Gary D (2001): Data report: The magnetic mineral assemblage of hemipelagic drifts, ODP Site 1096. In: Barker, P.F., Camerlenghi, A., Acton, G.D., and Ramsay, A.T.S. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 178, 1-12 by Stefanie A Brachfeld( Computer File )
in English and held by 1 library worldwide
During Ocean Drilling Program (ODP) Leg 178, we drilled three sites on sediment drifts deposited on the continental rise on the western margin of the Antarctic Peninsula. These hemipelagic drifts were targeted for their potential to preserve a continuous record of the behavior of the West Antarctic Ice Sheet over the last 10 m.y. It has been proposed that drift development is linked to advances and retreats of the Antarctic continental ice sheet (Pudsey and Camerlenghi, 1998, doi:10.1017/S0954102098000376, and references therein; Barker, Camerlenghi, Acton, et al., 1999, doi:10.2973/odp.proc.ir.178.1999). However, the sediment is characterized by a very low carbonate content, with foraminifers restricted to very narrow intervals. This lack of carbonate precludes the construction of a delta18O or CaCO3 stratigraphy, depriving these sites of an important chronologic tool and global ice volume proxy
U-channel paleomagnetic record of ODP Site 178-1098 (Table 2), supplementary data to: Brachfeld, Stefanie A; Acton, Gary D; Guyodo, Yohan; Banerjee, Subir K (2000): High-resolution paleomagnetic records from Holocene sediments from the Palmer Deep, Western Antartic Peninsula. Earth and Planetary Science Letters, 181(3), 429-441 by Stefanie A Brachfeld( Computer File )
in English and held by 1 library worldwide
Thick Holocene sedimentary sections (>45 m) cored in the Palmer Deep by the United States Antarctic Program (USAP) and during Ocean Drilling Program (ODP) Leg 178 provide the first opportunity to examine past geomagnetic field behavior at high southern latitudes. After removal of a low-coercivity drilling overprint the sediments display a stable, single-component remanent magnetization. Two short cores that recovered the uppermost 2.6 m of sediment have inclinations that fluctuate about the present day inclination (-57?) measured at Faraday Station, and several features with wavelengths of 10 to 20 cm appear to be correlative. However, shipboard measurements of inclination fluctuations on split-core samples from three holes drilled at ODP Site 1098 do not correlate well with each other, even though the intensity and susceptibility data correlate very well and the overall mean inclination for cores from each hole is consistent with the expected geocentric axial dipole (GAD) inclination. The correlation is improved dramatically by using inclinations measured on u-channels taken from the pristine center of a split core. Consequently, the anomalous directions and the resulting poor between-hole correlation of inclinations obtained from shipboard data can be attributed to coring-induced deformation, which is common on the outer edge of ODP piston cores, and/or measurement artifacts in the split-core data. Our preferred inclination record is thus derived from u-channel results. The upper 25 m represents continuous sedimentation over the past 9000 yr, with an average sedimentation rate exceeding 250 cm/kyr (0.25 cm/yr). Given that remanence measurements on u-channels average over an interval <7 cm long, we obtained independent measurements of the paleo-geomagnetic field that average over only 30 yr. This high-resolution record is characterized by an inclination that fluctuates within +/-15? of the current GAD inclination
Proceedings of the Ocean Drilling Program by Ocean Drilling Program( Book )
1 edition published in 2000 in English and held by 0 libraries worldwide
 
moreShow More Titles
fewerShow Fewer Titles
Languages
English (24)
Close Window

Please sign in to WorldCat 

Don't have an account? You can easily create a free account.