| Code |
Method Type |
IAGA7 |
URL |
Description |
|
| LT-AF-D |
Lab Treatment |
|
|
Alternating field: Double demagnetization with AF along X,Y,Z measurement followed by AF along -X,-Y,-Z measurement. Constable & Tauxe 1987. |
| LT-AF-G |
Lab Treatment |
|
|
Alternating field: Triple demagnetization with AF along Y,Z,X measurement followed by AF along Y and AF along Z measurement. Stephenson 1993. |
| LT-AF-I |
Lab Treatment |
A |
LINK |
Alternating field: In laboratory field. AF demagnetization in a small DC field offset to produce an ARM. |
| LT-AF-Z |
Lab Treatment |
A |
LINK |
Alternating field: In zero field. A specimen is subject to a decaying and alternating magnetic field such that the magnetic moments with coercivities below the peak field are aligned in opposed directions, and thus cancel. Specimens are typically reoriented in three or more orthogonal axes. As & Zijderveld 1958, Collinson 1983. |
| LT-CHEM |
Lab Treatment |
H |
|
Cleaning of porous rocks by chemical leaching with HCl. Roy & Park 1972. |
| LT-FC |
Lab Treatment |
|
|
Specimen cooled with laboratory field on. |
| LT-HT-I |
Lab Treatment |
|
|
High temperature treatment: In laboratory field. |
| LT-HT-Z |
Lab Treatment |
|
|
High temperature treatment: In zero field. Gallet & Le Goff 2006. |
| LT-IRM |
Lab Treatment |
|
|
IRM imparted to specimen prior to measurement. |
| LT-LT-I |
Lab Treatment |
|
|
Low temperature treatment: In laboratory field. |
| LT-LT-Z |
Lab Treatment |
|
|
Low temperature treatment: In zero field. In zero field the specimen is cooled to low temperature and warmed prior to measurement. Low temperature cycling of specimens can detect presence of particles whose magnetic properties depend on magnetocrystalline anisotropy, including multidomain grains. Ozema 1964, Dunlop & Ozdemir 1997. |
| LT-M-I |
Lab Treatment |
|
|
Using microwave radiation: In laboratory field. Walton et al. 1993. |
| LT-M-Z |
Lab Treatment |
|
|
Using microwave radiation: In zero field. Walton et al. 1992. |
| LT-MV-I |
Lab Treatment |
|
|
Using microwave radiation: In laboratory field. Walton et al. 1993. |
| LT-MV-Z |
Lab Treatment |
|
|
Using microwave radiation: In zero field. Walton et al. 1992. |
| LT-NO |
Lab Treatment |
N |
|
No treatments applied before measurement. |
| LT-NRM-APAR |
Lab Treatment |
|
|
Specimen heating and cooling: Laboratory field anti-parallel to the NRM vector. |
| LT-NRM-PAR |
Lab Treatment |
|
|
Specimen heating and cooling: Laboratory field parallel to the NRM vector. |
| LT-NRM-PERP |
Lab Treatment |
|
|
Specimen heating and cooling: Laboratory field perpendicular to the NRM vector. |
| LT-PMRM-I |
Lab Treatment |
|
|
pMRM check: After zero field step, perform an in field cooling after heating to lower T with microwave radiation. After treatment at a particular temperature step, the specimen is then reheated to a lower temperature and cooled with the laboratory field on thus reapplying a pTRM. |
| LT-PMRM-MD |
Lab Treatment |
|
|
pMRM tail check: After in laboratory field step, perform a zero field cooling after heating with same microwave power and time . A check carried out during Thellier procedures to detect multidomain grains. Additional zero field heating steps are used to remove a previously placed pTRM. The ability to remove a prior pTRM step at the same temperature imparted is used as an indicator of reversal. |
| LT-PMRM-Z |
Lab Treatment |
|
|
pMRM tail check: After in laboratory field step, perform a zero field cooling after microwave heating at a lower power/time. After heating to a particular temperature step and cooling in field. The specimen is heated to a lower temperature step and cooled in zero field. This checks for low temperature pTRM tails. |
| LT-PTRM-I |
Lab Treatment |
|
LINK |
pTRM check: After zero field step, perform an in field cooling. After treatment at a particular temperature step, the specimen is then reheated to a lower temperature and cooled with the laboratory field on thus reapplying a pTRM. Coe 1967. |
| LT-PTRM-MD |
Lab Treatment |
|
|
pTRM tail check: After in laboratory field step, perform a zero field cooling at same temperature. A check carried out during Thellier procedures to detect multidomain grains. Additional zero field heating steps are used to remove a previously placed pTRM. The ability to remove a prior pTRM step at the same temperature imparted is used as an indicator of reversal. Riisager & Riisager 2001, Scherbakov et al. 1993. |
| LT-PTRM-Z |
Lab Treatment |
|
LINK |
pTRM tail check After in laboratory field step, perform a zero field cooling at a lower temperature. After heating to a particular temperature step and cooling in field. The specimen is heated to a lower temperature step and cooled in zero field. This checks for low temperature pTRM tails. Harcombe-Smee et al. 1996. |
| LT-T-I |
Lab Treatment |
|
LINK |
Specimen cooling: In laboratory field. Heating to a specific temperature to remove NRM and then cooling in a known magnetic field to induce TRM. Koenigsberger 1938a, Koenigsberger 1938b, Thellier & Thellier 1959. |
| LT-T-Z |
Lab Treatment |
T |
LINK |
Specimen cooling: In zero field. Heating the specimen to the desired temperature step and then cooling in zero ambient magnetic field. Wilson 1961, Collinson 1983. |
| LT-VD |
Lab Treatment |
V |
|
Viscous demagnetization by applying MU-metal screening. Placing a specimen in a zero field environment (often a MU-metal shield) allows for the relaxation of the softest components of magnetization. This randomizing effect can then be measured over time. MU-metal is Ni-Fe alloy of high permeability. Dunlop & Ozdemir 1997. |
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