Nizou, Jean; Demory, François (2015): Low-field magnetic susceptibility and magnetic parameters of the navigation channel dried grab samples [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.830269, In supplement to: Nizou, Jean; Demory, François; Dubrulle-Brunaud, Carole (2016): Monitoring of dredged-dumped sediment dispersal off the Bay of the Seine (northern France) using environmental magnetism. Comptes Rendus Geoscience, 348(6), 451-461, https://doi.org/10.1016/j.crte.2015.02.005
Always quote citation above when using data! You can download the citation in several formats below.
Coverage:
Median Latitude: 49.435493 * Median Longitude: 0.184483 * South-bound Latitude: 49.431538 * West-bound Longitude: 0.073266 * North-bound Latitude: 49.439447 * East-bound Longitude: 0.295701
Event(s):
Comment:
Low-field magnetic susceptibility of every sample was measured with an MFK1 susceptibilimeter (AGICO; K_LF ). The obtained value was normalized by the weight of the sample to determine the specific low-field magnetic susceptibility, X_LF . Determination of Anhysteretic Remanent Magnetization (ARM), Saturation Isothermal Remanent Magnetization (SIRM) and Isothermal Remanent Magnetization (IRM) was performed with a superconducting rock magnetometer SRM760R (2G enterprises). The ARM is an artificial magnetization gained in an alternating magnetic field of 100 mT superimposed on a steady field of 50 µT, which is comparable to the strength of the geomagnetic field. The ARM is afterward subject to demagnetization at 30 mT (ARM_30 ). The SIRM was acquired at 3 T and the IRM at 0.3 T in the opposite direction using a pulse magnetizer MMPM9 (Magnetic Measurements ltd). The S-ratio was calculated after the formula 0.5(1-IRM/SIRM) and allows for an estimation of the relative abundance of high coercivity minerals. TheS-ratio comesclose to 1when low-coercive mineralssuch a as magnetite dominate the signal, and decreaseswith increasing amount of high-coercive mineralssuch as hematite (Bloemendal et al., 1992).The Hard Isothermal Remanent Magnetization (HIRM) was calculated after the formula (SIRM-IRM)/2 and allows for an estimation of the absolute concentration of high coercivity minerals (e.g. hematite).ARM/SIRM is used as an estimator of the relative magnetic grain size. ARM_30 /ARM is also used as a magnetic grain-size estimator since samples display a constant mineralogy.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Sample code/label | Sample label | Nizou, Jean | |||
| 3 | Dry mass | Dry m | g | Nizou, Jean | ||
| 4 | Magnetic susceptibility, volume | kappa | 10-6 SI | Nizou, Jean | Susceptibilimeter, MFK1 (AGICO; K_LF) | Low-field |
| 5 | Susceptibility, specific, low-field mass-normalized | chi_lf | 10-9 m3/kg | Nizou, Jean | Susceptibilimeter, MFK1 (AGICO; K_LF) | |
| 6 | Anhysteretic Remanent Magnetization | ARM | 10-3 Am2 | Nizou, Jean | Superconducting rock magnetometer SRM760R (2G enterprises) | |
| 7 | Anhysteretic Remanent Magnetization | ARM | 10-3 Am2 | Nizou, Jean | Superconducting rock magnetometer SRM760R (2G enterprises) | ARM30 |
| 8 | Saturation isothermal remanent magnetization | SIRM | 10-3 A m2 | Nizou, Jean | Magnetometer SRM760R (2G enterprises); pulse magnetizer MMPM9 | 3T |
| 9 | Isothermal Remanent Magnetization | IRM | 10-3 Am2 | Nizou, Jean | Magnetometer SRM760R (2G enterprises); pulse magnetizer MMPM9 | -0.3T |
| 10 | Anhysteretic remanent magnetization, Intensity, per unit mass | Inten ARM | 10-6 A*m2/kg | Nizou, Jean | ||
| 11 | Anhysteretic remanent magnetization, Intensity, per unit mass | Inten ARM | 10-6 A*m2/kg | Nizou, Jean | ARM30 | |
| 12 | Saturation isothermal remanent magnetization | SIRM | 10-6 A m2/kg | Nizou, Jean | SIRM 3T | |
| 13 | Isothermal remanent magnetization, Intensity, per unit mass | Inten IRM | 10-6 A*m2/kg | Nizou, Jean | IRM-0.3T | |
| 14 | S-ratio (hematite/magnetite) | S-r | Nizou, Jean | |||
| 15 | Hard isothermal remanent magnetization, Intensity, per unit mass | Inten HIRM | 10-6 A*m2/kg | Nizou, Jean | ||
| 16 | ARM/ARM | ARM/ARM | Nizou, Jean | ARM30/ARM | ||
| 17 | Anhysteretic remanent magnetization/saturation isothermal remanent magnetization ratio | ARM/SIRM | Nizou, Jean |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
160 data points