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Ohneiser, Christian; Acton, Gary D; Channell, James E T; Wilson, Gary S; Yamamoto, Yuhji; Yamazaki, Toshitsugu (2013): Paleointensity record of Site 320-U1336 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.810526, Supplement to: Ohneiser, C et al. (2013): A middle Miocene Relative Paleointensity Record from the Equatorial Pacific. Earth and Planetary Science Letters, 374, 227-238, https://doi.org/10.1016/j.epsl.2013.04.038

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Abstract:
We present a high-resolution magnetostratigraphy and relative paleointensity (RPI) record derived from the upper 85 meters of IODP Site U1336, an equatorial Pacific early to middle Miocene succession recovered during Expedition 320/321. The magnetostratigraphy is well resolved with reversals typically located to within a few centimeters resulting in a well-constrained age model. The lowest normal polarity interval, from 85 to 74.87 meters, is interpreted as the upper part of Chron C6n (18.614-19.599 Ma). Another 33 magnetozones occur from 74.87 to 0.85 m, which are interpret to represent the continuous sequence of chrons from Chron C5Er (18.431-18.614 Ma) up to the top of Chron C5An.1n (12.014 Ma). We identify three new possible subchrons within Chron C5Cn.1n, Chron 5Bn.1r, and C5ABn. Sedimentation rates vary from about 7 to 15 m/Myr with a mean of about 10 m/Myr. We observe rapid, apparent changes in the sedimentation rate at geomagnetic reversals between ~16 and 19 Ma that indicate a calibration error in geomagnetic polarity timescale (ATNTS2004). The remanence is carried mainly by non-interacting particles of fine-grained magnetite, which have FORC distributions characteristic of biogenic magnetite. Given the relative homogeneity of the remanence carriers throughout the 85-m-thick succession and the quality with which the remanence is recorded, we have constructed a relative paleointensity (RPI) record that provides new insights into middle Miocene geomagnetic field behavior. The RPI record indicates a gradual decline in field strength between 18.5 Ma and 14.5 Ma, and indicates no discernible link between RPI and either chron duration or polarity state.
Project(s):
Integrated Ocean Drilling Program / International Ocean Discovery Program (IODP)
Coverage:
Latitude: 7.701117 * Longitude: -128.254217
Event(s):
320-U1336 * Latitude: 7.701117 * Longitude: -128.254217 * Elevation: -4286.0 m * Campaign: Exp320 (Pacific Equatorial Age Transect I) * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets

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Datasets listed in this publication series

  1. Ohneiser, C; Acton, GD; Channell, JET et al. (2013): Age model of IODP Site 320-U1336. https://doi.org/10.1594/PANGAEA.810523
  2. Ohneiser, C; Acton, GD; Channell, JET et al. (2013): Magnetic investigations of Site 320-U1336. https://doi.org/10.1594/PANGAEA.810525
  3. Ohneiser, C; Acton, GD; Channell, JET et al. (2013): Virtual geomagnetic pole reconstruction at Site 320-U1336. https://doi.org/10.1594/PANGAEA.810524