Shau, Yen-Hong; Torii, Masayuki; Horng, Chorng-Shern; Liang, Wen-Tzong (2004): (Table T1) Magnetic properties of MORB from ODP Leg 187 sites [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.780754, Supplement to: Shau, Y-H et al. (2004): Magnetic properties of mid-ocean-ridge basalts from Ocean Drilling Program Leg 187. In: Pedersen, RB; Christie, DM; Miller, DJ (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 187, 1-25, https://doi.org/10.2973/odp.proc.sr.187.204.2004
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Abstract:
The core samples of mid-ocean-ridge basalts (including Indian and Pacific type) recovered from the Southeast Indian Ridge (SEIR) area near the Australian Antarctic Discordance during Ocean Drilling Program Leg 187 were studied using rock magnetism, mineralogy, and petrography methods. On the basis of thermomagnetic analyses and low-temperature magnetometry, the dominant magnetic carrier in most of the basalt samples (pillow basalts) is characterized as titanomaghemite, which presumably formed by low-temperature oxidation of primary titanomagnetite. Some samples from unaltered massive basalts contain nearly unoxidized titanomagnetite as the main magnetic mineral. A metadiabase sample showing greenschist facies metamorphism contains magnetic minerals dominated by magnetite. The pillow basalts contain titanomaghemite ranging from stable single-domain to pseudosingle-domain (PSD) grains, and the majority are characterized by a single stable component of remanence. The massive basalts show hysteresis features of larger PSD grains and contain a very low coercivity remanence. The values of natural remanent magnetization (NRM) of the samples in this SEIR area are on the same order as those of other oceanic ridge basalts. They show a general decreasing trend of NRM with increasing crust age. However, the values of NRM show no correlation either with the tectonic zonations (Zone A vs. Zone B) or with the mantle provinces (Pacific vs. Indian types).
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -43.392231 * Median Longitude: 129.132310 * South-bound Latitude: -45.956700 * West-bound Longitude: 126.908300 * North-bound Latitude: -41.271510 * East-bound Longitude: 134.998350
Date/Time Start: 1999-08-12T23:30:00 * Date/Time End: 2000-01-06T09:00:00
Minimum Elevation: -5736.4 m * Maximum Elevation: -4354.0 m
Event(s):
187-1152A * Latitude: -41.897930 * Longitude: 127.006710 * Date/Time Start: 1999-08-12T23:30:00 * Date/Time End: 1999-11-27T11:15:00 * Elevation: -5055.4 m * Penetration: 11.2 m * Recovery: 0.59 m * Location: Indian Ocean * Campaign: Leg187 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 1 core; 11.2 m cored; 0 m drilled; 5.3 % recovery
187-1152B * Latitude: -41.897210 * Longitude: 127.007580 * Date/Time Start: 1999-11-27T11:15:00 * Date/Time End: 1999-11-29T00:00:00 * Elevation: -5055.4 m * Penetration: 46.3 m * Recovery: 3.59 m * Location: Indian Ocean * Campaign: Leg187 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 5 cores; 23.7 m cored; 0 m drilled; 15.1 % recovery
187-1153A * Latitude: -41.271510 * Longitude: 129.815130 * Date/Time Start: 1999-11-29T00:00:00 * Date/Time End: 1999-12-01T19:00:00 * Elevation: -5581.4 m * Penetration: 274.9 m * Recovery: 1.77 m * Location: Indian Ocean * Campaign: Leg187 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 1 core; 7.3 m cored; 0 m drilled; 24.2 % recovery
Comment:
Mantle province and sample depth data are from Shipboard Scientific Party (2001, doi:10.2973/odp.proc.ir.187.101.2001).
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Sample code/label | Sample label | Shau, Yen-Hong | DSDP/ODP/IODP sample designation | ||
| 3 | Sample ID | Sample ID | Shau, Yen-Hong | |||
| 4 | Sample comment | Sample comment | Shau, Yen-Hong | mantle province | ||
| 5 | Depth, relative | Depth rel | m | Shau, Yen-Hong | m in basement | |
| 6 | NRM, Intensity | Inten (NRM) | mA/m | Shau, Yen-Hong | Magnetometer, spinner (SMD-88) | |
| 7 | Magnetic susceptibility, volume | kappa | 10-6 SI | Shau, Yen-Hong | Bartington MS2 magnetic susceptibility meter | |
| 8 | Hysteresis, saturation remanence, per unit volume | Msr | mA/m | Shau, Yen-Hong | Magnetometer (MAG) | |
| 9 | Hysteresis, saturation magnetization, per unit volume | Ms | mA/m | Shau, Yen-Hong | Magnetometer (MAG) | |
| 10 | Hysteresis, saturation magnetization/ saturation remanence | Mrs/Ms | Shau, Yen-Hong | Magnetometer (MAG) | ||
| 11 | Coercive force | Bc | mT | Shau, Yen-Hong | Magnetometer (MAG) | |
| 12 | Coercivity of remanence | Bcr | mT | Shau, Yen-Hong | Magnetometer (MAG) | |
| 13 | Coercivity of remanence/coercive force | Bcr/Bc | Shau, Yen-Hong | Magnetometer (MAG) | ||
| 14 | Curie temperature | Curie temp | °C | Shau, Yen-Hong | # = or 580°C |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
1411 data points