Zhao, Xixi; Galbrun, Bruno; Delius, Heike; Liu, Qingsong (2007): Paleomagnetic and rock magnetic characterization of ODP Leg 210 cores [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.776793, Supplement to: Zhao, X et al. (2007): Paleolatitude inferred from Cretaceous sedimentary and igneous cores recovered from Leg 210, Newfoundland margin. In: Tucholke, BE; Sibuet, J-C; Klaus, A (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 210, 1-37, https://doi.org/10.2973/odp.proc.sr.210.114.2007
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Abstract:
We conducted an integrated paleomagnetic and rock magnetic study on cores recovered from Ocean Drilling Program Sites 1276 and 1277 of the Newfoundland Basin. Stable components of magnetization are determined from Cretaceous-aged sedimentary and basement cores after detailed thermal and alternating-field demagnetization. Results from a series of rock magnetic measurements corroborate the demagnetization behavior and show that titanomagnetites are the main magnetic carrier. In view of the normal polarity of magnetization and radiometric dates for the sills at Site 1276 (~98 and ~105 Ma, both within the Cretaceous Normal Superchron) and for a gabbro intrusion in peridotite at Site 1277 (~126 Ma, Chron M1), our results suggest that the primary magnetization of the Cretaceous rocks is likely retained in these rocks. The overall magnetic inclination of lithologic Unit 2 in Hole 1277A between 143 and 180 meters below seafloor is 38°, implying significant (~35° counterclockwise, viewed to the north) rotation of the basement around a horizontal axis parallel to the rift axis (010°). The paleomagnetic rotational estimates should help refine models for the tectonic evolution of the basement. The mean inclinations for Sites 1276 and 1277 rocks imply paleolatitudes of 30.3° ± 5.1° and 22.9° ± 12.0°, respectively, with the latter presumably influenced by tectonic rotation. These values are consistent with those inferred from the mid-Cretaceous reference poles for North America, suggesting that the inclination determinations are reliable and consistent with a drill site on a location in the North America plate since at least the mid-Cretaceous. The combined paleolatitude results from Leg 210 sites indicate that the Newfoundland Basin was some 1800 km south of its current position in the mid-Cretaceous. Assuming a constant rate of motion, the paleolatitude data would suggest a rate of 12.1 mm/yr for the interval from ~130 Ma (Site 1276 age) to present, and 19.6 mm/yr for the interval from 126 Ma (Site 1277 age) to recent. The paleolatitude and rotational data from this study are consistent with the possibility that Site 1276 may have passed over the Canary and Madeira hotspots that formed the Newfoundland Seamounts in the mid-Cretaceous.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 45.300997 * Median Longitude: -44.581247 * South-bound Latitude: 45.196660 * West-bound Longitude: -44.785833 * North-bound Latitude: 45.405333 * East-bound Longitude: -44.376660
Date/Time Start: 2003-02-09T00:00:00 * Date/Time End: 2003-09-04T13:30:00
Event(s):
210-1276 * Latitude: 45.405333 * Longitude: -44.785833 * Date/Time Start: 2003-07-16T00:00:00 * Date/Time End: 2003-02-09T00:00:00 * Elevation: -4549.1 m * Penetration: 1736.9 m * Recovery: 790.3 m * Location: North Atlantic Ocean * Campaign: Leg210 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 103 cores; 936.9 m cored; 753 m drilled; 84.4 % recovery
210-1276A * Latitude: 45.405330 * Longitude: -44.785830 * Date/Time Start: 2003-07-16T08:44:00 * Date/Time End: 2003-02-09T16:20:00 * Elevation: -4549.1 m * Penetration: 1736.9 m * Recovery: 790.35 m * Location: North Atlantic Ocean * Campaign: Leg210 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 103 cores; 936.9 m cored; 753 m drilled; 84.4 % recovery
210-1277 * Latitude: 45.196667 * Longitude: -44.376667 * Date/Time Start: 2003-09-02T00:00:00 * Date/Time End: 2003-09-04T00:00:00 * Elevation: -4628.2 m * Penetration: 180.3 m * Recovery: 29.2 m * Location: North Atlantic Ocean * Campaign: Leg210 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 8 cores; 76.4 m cored; 0 m drilled; 38.3 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets
Download Data
Datasets listed in this publication series
- Zhao, X; Galbrun, B; Delius, H et al. (2007): (Table T3) Mean inclinations and paleolatitudes of ODP Holes 210-1276A and 210-1277A. https://doi.org/10.1594/PANGAEA.776792
- Zhao, X; Galbrun, B; Delius, H et al. (2007): (Table T1) Paleomagnetic of sedimentary and igneous rocks of ODP Holes 210-1276A and 210-1277A. https://doi.org/10.1594/PANGAEA.776790
- Zhao, X; Galbrun, B; Delius, H et al. (2007): (Table T2) Rock magnetic properties of ODP Holes 210-1276A and 210-1277A. https://doi.org/10.1594/PANGAEA.776791