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Machek, Matěj; Roxerová, Zuzana; Závada, Prokop; Silva, P F; Henry, B; Dedecek, P; Petrovský, E; Marques, F O (2014): AMS and EBSD maps of rock salt - lamprophyre dyke contact zone, Loule diapir, Algarve basin, Portugal [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.820353, Supplement to: Machek, M et al. (2014): Intrusion of lamprophyre dyke and related deformation effects in the host rock salt: A case study from the Loulé diapir, Portugal. Tectonophysics, 629, 165-178, https://doi.org/10.1016/j.tecto.2014.04.030

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Abstract:
A rock salt-lamprophyre dyke contact zone (sub-vertical, NE-SW strike) was investigated for its petrographic, mechanic and physical properties by means of anisotropy of magnetic susceptibility (AMS) and rock magnetic properties, coupled with quantitative microstructural analysis and thermal mathematical modelling. The quantitative microstructural analysis of halite texture and solid inclusions revealed good spatial correlation with AMS and halite fabrics. The fabrics of both lamprophyre and rock salt record the magmatic intrusion, "plastic" flow and regional deformation (characterized by a NW-SE trending steep foliation). AMS and microstructural analysis revealed two deformation fabrics in the rock salt: (1) the deformation fabrics in rock salt on the NW side of the dyke are associated with high temperature and high fluid activity attributed to the dyke emplacement; (2) On the opposite side of the dyke, the emplacement-related fabric is reworked by localized tectonic deformation. The paleomagnetic results suggest significant rotation of the whole dyke, probably during the diapir ascent and/or the regional Tertiary to Quaternary deformation.
Further details:
Bachmann, Florian; Hielscher, Ralf; Schaeben, H (2013): A MATLAB Toolbox for quantitative texture analysis [dataset]. Google Project Hosting, https://code.google.com/archive/p/mtex
Coverage:
Latitude: 37.134900 * Longitude: -8.079000
Event(s):
LM4 (Salt mine) * Latitude: 37.134900 * Longitude: -8.079000 * Location: Mina Campina de Cima, Algarve basin, Portugal * Method/Device: Geological sample (GEOS)
Comment:
The low field anisotropy of magnetic susceptibility (AMS) was measured with a MFK1-FA Kappabridge (Jelínek and Pokorný, 1997) in the field of 200 A/m and for a frequency of 976 Hz (Institute Dom Luiz - Univ. Lisbon).
File columns: sample Name, rock type, distance from dyke centre, magnetic field in A/m (Field), operating frequency (Freq.), measured bulk magnetic susceptibility (Km), anisotropy factors L, F, P, Pj, T, U (for explanation please see Jelínek, 1981) , orientation of principal magnetic susceptibilities (orientation of principal axes of magnetic susceptibility tensor K1>K2>K3) dec -declination (0 - 360°), inc - inclination (0 - 90°) in geographic coordinates (North = 0, horizontal = 0), K11- K13 - description of symmetrical AMS tensor.
The Loulé salt diapir in the Mesozoic-Cenozoic Algarve basin was chosen as case study to show the relationship between mafic dyke emplacement and host-rock salt deformation.
The studied lamprophyre dyke is 3m thick, strikes N310 and dips 80º to the NW. In both margins of the dyke, the texture is aphanitic with devitrified volcanic glass and abundant euhedral as well as skeletal xenocrysts of olivine and olivine xenoliths, with serpentinized olivine xenocrysts at the SE margin. The dyke centre shows subophitic texture of plagioclase laths, needle crystals of amphibole and large anhedral crystals of biotite, with high amount of volcanic glass. The olivine xenocrysts are significantly less abundant in the dyke core. Only brittle structures have been observed in the dyke itself. Fractures within the dyke are filled with halite. Within the host-rocks close to the SE dyke margin, angular fragments of lamprophyre of various sizes can be observed.
Samples were collected in rock salt and within and around a lamprophyre dyke in the Loulé Mine. A profile across the host-rock salt and dyke was sampled in detail. The salt rock was sampled on the NW and SE sides of the dyke, between a distance of 5 to 220 cm and 10 to 75cm of dyke margins, respectively. The dyke was also sampled along a complete cross-section.
Crystalographyc prefered orientation maps of salt rock (SaltEBSDmaps.zip) in Channel text files *.ctf obtained using NORDLYS II (HKL Technology) EBSD system mounted on TESCAN Vega scanning electron microscope (Institute of Petrology and Structural Geology of the Faculty of Science at Charles University in Prague) in the mapping mode with 10 µm step size. The .ctf file is a text file containing header with information about mineral phases measured and the data consists of phase orientation in each point measured. The .ctf file can be read by commercial HKL Technology (Oxford Instruments) software or better using the MATLAB® Toolbox for Quantitative Texture Analysis (MTEX) (Bachmann et al., 2010; 2011; https://code.google.com/p/mtex/) under GNU GPL v2 licence.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
Sample code/labelSample labelMachek, Matěj
Rock typeRockMachek, Matěj
DistanceDistancekmMachek, Matějfrom dyke center
Magnetic field strengthMag f strA/mMachek, Matěj
Operation modeOp modeMachek, MatějFrequency
SusceptibilitySusceptsensor valuesMachek, Matěj
Anisotropy-magnetic susceptibility, factor L, lineationAMS factor LMachek, Matěj
Anisotropy-magnetic susceptibility, factor F, foliationAMS factor FMachek, Matěj
Anisotropy-magnetic susceptibility, factor P, anisotropy degreeAMS factor PMachek, Matěj
10 Anisotropy-magnetic susceptibility, factor PjAMS factor PjMachek, Matěj
11 Anisotropy-magnetic susceptibility, factor TAMS factor TMachek, Matěj
12 Anisotropy-magnetic susceptibility, factor UAMS factor UMachek, Matěj
13 Declination of principle axis K1D(Kmax)degMachek, Matěj
14 Inclination of principle axis K1I(Kmax)degMachek, Matěj
15 Declination of principle axis K2D(Kint)degMachek, Matěj
16 Inclination of principle axis K2I(Kint)degMachek, Matěj
17 Declination of principle axis K3D(Kmin)degMachek, Matěj
18 Inclination of principle axis K3I(Kmin)degMachek, Matěj
19 Description of symmetrical anisotropy of magnetic susceptibility tensorDesc AMS tensorMachek, MatějK11
20 Description of symmetrical anisotropy of magnetic susceptibility tensorDesc AMS tensorMachek, MatějK22
21 Description of symmetrical anisotropy of magnetic susceptibility tensorDesc AMS tensorMachek, MatějK33
22 Description of symmetrical anisotropy of magnetic susceptibility tensorDesc AMS tensorMachek, MatějK12
23 Description of symmetrical anisotropy of magnetic susceptibility tensorDesc AMS tensorMachek, MatějK23
24 Description of symmetrical anisotropy of magnetic susceptibility tensorDesc AMS tensorMachek, MatějK13
Size:
1368 data points

Data

Download dataset as tab-delimited text — use the following character encoding:


Sample label

Rock

Distance [km]
(from dyke center)

Mag f str [A/m]

Op mode
(Frequency)

Suscept [sensor values]

AMS factor L

AMS factor F

AMS factor P
10 
AMS factor Pj
11 
AMS factor T
12 
AMS factor U
13 
D(Kmax) [deg]
14 
I(Kmax) [deg]
15 
D(Kint) [deg]
16 
I(Kint) [deg]
17 
D(Kmin) [deg]
18 
I(Kmin) [deg]
19 
Desc AMS tensor
(K11)
20 
Desc AMS tensor
(K22)
21 
Desc AMS tensor
(K33)
22 
Desc AMS tensor
(K12)
23 
Desc AMS tensor
(K23)
24 
Desc AMS tensor
(K13)
LM4-1Asalt2.25200F1-9.361.0061.0161.0221.0230.480-0.476145.920.2271.957.946.623.8-0.99601-1.00153-1.00246-0.008920.00138-0.00575
LM4-1Bsalt2.25200F1-6.931.0131.0101.0231.023-0.1270.132154.345.4303.640.347.615.9-1.00046-1.00453-0.99500-0.00777-0.00036-0.00669
LM4-2Asalt2.07200F16.291.0231.0201.0431.043-0.062-0.07328.248.2247.034.9142.320.00.995980.994791.009230.012500.001470.01484
LM4-2Bsalt2.07200F10.321.2251.1561.4161.418-0.168-0.251137.576.9258.16.7349.411.10.855140.971541.173320.017230.03707-0.05985
LM4-3Asalt1.80200F1530.741.0121.0201.0331.0330.2390.231229.657.543.032.4134.93.00.994080.994571.011350.01178-0.00506-0.00295
LM4-3Bsalt1.80200F1175.951.0691.0821.1571.1570.0840.04830.762.7179.623.9275.212.51.012510.934081.053410.013010.030530.02281
LM4-4Asalt1.60200F1300.061.0311.0381.0701.0700.1020.085220.464.548.725.3317.23.20.985680.987531.026800.02090-0.00633-0.01059
LM4-4Bsalt1.60200F1445.341.0171.0381.0551.0570.3880.377226.281.863.97.8333.62.50.977340.999611.023040.01486-0.00100-0.00305
LM4-5Adyke1.50200F199949.971.0171.1111.1301.1420.7190.70444.99.3292.766.6138.621.30.986870.997891.015230.05294-0.020990.02806
LM4-5Bdyke1.50200F142482.121.0041.0991.1041.1180.9150.91127.466.1249.918.1154.815.10.959161.014001.026850.03361-0.009180.02254
LM4-6Adyke1.40200F130590.111.0141.0081.0221.022-0.306-0.311289.752.759.626.0162.624.70.992681.001841.005480.00011-0.007360.00505
LM4-6Bdyke1.40200F132749.651.0551.0221.0781.080-0.419-0.434290.961.450.315.0147.123.70.978060.994611.027330.00404-0.025520.01469
LM4-6Cdyke1.40200F126012.331.0101.0091.0191.019-0.030-0.035345.064.3245.84.4153.725.30.995560.998461.005980.00247-0.002520.00677
LM4-7Bdyke1.42200F124702.131.0151.0161.0311.0310.0440.036271.437.251.645.4164.521.00.987681.008641.003680.00330-0.008420.00522
LM4-7Cdyke1.42200F145157.771.0051.0131.0191.0200.4260.422357.659.8248.910.6153.228.00.995731.000521.003750.00413-0.002580.00727
LM4-8Adyke1.47200F144993.801.0101.0101.0201.020-0.022-0.02728.673.7250.412.3158.110.50.992340.998701.008960.003590.000670.00404
LM4-8Bdyke1.47200F149901.581.0121.0111.0231.023-0.062-0.068342.972.6113.411.5206.012.90.992410.997661.00993-0.00424-0.000010.00534
LM4-8Cdyke1.47200F138082.101.0151.0151.0311.031-0.008-0.015318.877.467.54.1158.411.90.987970.998241.013800.00451-0.003240.00522
LM4-9Adyke1.48200F144701.481.0071.0241.0311.0330.5240.51818.949.4258.723.3153.631.10.994371.002281.003350.00778-0.003410.01275
LM4-9Bdyke1.48200F133886.021.0141.0801.0951.1020.7020.69156.320.6152.716.6278.763.01.023971.013750.962280.007920.03401-0.00209
LM4-10Adyke1.30200F148534.891.0111.0071.0181.018-0.200-0.205344.873.0249.51.6159.016.90.993980.998011.008010.00194-0.001500.00474
LM4-10Bdyke1.30200F133139.661.0091.0131.0221.0220.1660.161329.381.8226.71.8136.48.00.994740.995271.009990.00618-0.001870.00239
LM4-10Cdyke1.30200F126867.931.0091.0091.0191.0190.0230.018244.780.873.69.1343.41.40.991540.999541.008920.00266-0.00123-0.00083
LM4-11Adyke0.75200F151315.471.0161.0531.0711.0740.5240.511269.744.047.337.4155.922.70.975231.012831.011950.01633-0.015730.01658
LM4-11Bdyke0.75200F139634.621.0071.0101.0181.0180.1740.170264.030.132.647.1156.527.40.994181.005161.000660.00356-0.004860.00356
LM4-11Cdyke0.75200F139288.681.0081.0091.0161.0160.0510.047278.350.858.832.2161.919.90.993521.002561.003920.00178-0.004590.00313
LM4-12Bdyke0.68200F144449.751.0611.0831.1501.1510.1470.113258.240.825.735.1139.029.40.973211.013831.012970.03617-0.051600.01877
LM4-12Cdyke0.68200F138969.931.0051.0161.0211.0220.5010.497285.858.942.815.3140.626.30.996100.999701.004200.00575-0.006140.00540
LM4-12Ddyke0.68200F137955.081.0081.0131.0211.0220.2580.253301.349.240.47.7136.839.80.998531.000581.000890.00241-0.007790.00678
LM4-13Adyke0.33200F157557.471.0041.0121.0161.0160.5030.500266.518.334.861.9169.320.50.992711.005741.001550.00208-0.001870.00370
LM4-13Bdyke0.33200F167806.701.0021.0041.0061.0060.1820.181253.517.5356.635.8142.348.90.999581.001850.998570.00135-0.001750.00119
LM4-14Bdyke-0.10200F172391.541.0091.0161.0251.0260.3060.300330.54.192.182.1240.06.71.005050.992641.00231-0.010580.001310.00147
LM4-14Cdyke-0.10200F151808.841.0071.0101.0171.0170.1620.157339.116.2127.071.1246.39.51.005010.993841.00115-0.005590.000770.00238
LM4-14Ddyke-0.10200F153557.291.0031.0071.0101.0100.4740.472319.39.4151.080.449.61.90.999970.998441.00160-0.00478-0.000450.00016
LM4-15Adyke-0.58200F186651.731.0041.0061.0101.0100.2030.201164.45.169.941.7260.147.91.004400.998280.99732-0.001530.003130.00018
LM4-15Bdyke-0.58200F184779.271.0071.0071.0131.0130.0030.000164.714.252.556.2263.130.01.005710.995550.99874-0.002180.00326-0.00117
LM4-15Cdyke-0.58200F189692.511.0071.0071.0141.014-0.019-0.022155.527.318.754.7256.620.61.004140.995321.00054-0.003390.00332-0.00208
LM4-16Adyke-0.85200F174468.411.0141.0221.0371.0370.2050.1968.474.0221.513.5129.48.40.994930.989781.015290.01051-0.001850.00578
LM4-16Bdyke-0.85200F178255.961.0081.0141.0231.0230.2810.276161.769.924.815.0291.213.11.001150.990451.008410.004260.00374-0.00361
LM4-17Adyke-1.11200F155048.761.0021.0151.0171.0190.7120.710254.464.671.725.4162.21.00.990771.003131.006110.00440-0.001010.00000
LM4-17Bdyke-1.11200F166288.161.0031.0121.0161.0170.5780.57548.37.4302.664.4141.724.40.998171.000881.000950.00655-0.002540.00389
LM4-18Adyke-1.47200F149509.901.0081.0251.0331.0340.4910.485128.586.7222.60.2312.63.30.994270.992261.013470.011930.00139-0.00123
LM4-18Bdyke-1.47200F150917.281.0041.0201.0241.0250.6710.66896.275.4229.310.1321.210.50.993780.998061.008170.009140.00311-0.00280
LM4-19Adyke-1.48200F134213.731.0051.0181.0231.0240.5880.58463.329.3238.260.6332.12.20.991071.003371.005560.008930.002130.00030
LM4-19Bdyke-1.48200F134380.681.0031.0151.0191.0200.6370.634183.172.363.39.0330.815.10.993431.000571.006000.006060.00182-0.00434
LM4-20Adyke-1.48200F140781.181.0081.0111.0181.0180.1670.16287.584.4228.44.4318.73.50.995120.996511.008370.005160.00116-0.00045
LM4-20Bdyke-1.48200F136799.731.0061.0121.0181.0180.3130.30975.775.2225.212.9316.97.30.995770.996861.007370.005800.00247-0.00069
LM4-20Cdyke-1.48200F138356.141.0071.0131.0211.0210.2980.29394.470.2228.814.1322.313.60.994150.998151.007700.006010.00416-0.00258
LM4-21Adyke-1.48200F137996.391.0091.0111.0211.0210.0740.069234.870.362.319.6331.52.40.992450.998721.008830.00506-0.00224-0.00213
LM4-21Bdyke-1.48200F137299.721.0171.0121.0291.029-0.176-0.183202.775.965.910.4334.29.50.989850.996241.013910.00484-0.00073-0.00543
LM4-22salt-1.55200F1-8.741.0161.0051.0211.022-0.5650.569249.023.881.165.7341.04.5-1.01007-0.99450-0.995430.00625-0.00113-0.00180
LM4-23Asalt-1.62200F1-1.901.2351.1001.3591.368-0.3800.44415.670.7237.714.6144.512.4-1.08708-1.02564-0.887280.10375-0.020080.06426
LM4-23Bsalt-1.62200F1-7.731.0271.0041.0301.033-0.7590.76295.639.1240.745.3350.118.2-1.01548-0.99096-0.993550.003820.00309-0.00790
LM4-24salt-1.75200F1-8.201.0091.0191.0291.0290.345-0.33964.69.3177.467.1331.020.7-1.00601-0.99015-1.003840.010540.00420-0.00139
LM4-25salt-2.50200F119.831.0101.0181.0291.0290.2860.280157.164.6250.11.4340.725.30.991091.001301.007600.003920.00383-0.01019
LM4-26Asalt-3.70200F10.341.1491.6791.9302.0000.5770.461126.740.9243.827.6356.636.60.842351.151851.00580-0.027950.07704-0.25959
LM4-26Bsalt-3.70200F13.101.0561.0861.1461.1470.2050.172203.585.8320.71.950.83.70.976410.960271.06332-0.03869-0.00562-0.00701