Gehrmann, Romina A S; North, Laurence J; Lehrmann, Berit; Murton, Bramley J (2019): Rock physic samples from TAG, Mid-Atlantic Ridge, and various onshore samples [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.899411, Supplement to: Gehrmann, Romina A S; North, Laurence J; Graber, Sebastian; Szitkar, Florent; Petersen, S; Minshull, Tim A; Murton, Bramley J (2019): Marine Mineral Exploration With Controlled Source Electromagnetics at the TAG Hydrothermal Field, 26°N Mid‐Atlantic Ridge. Geophysical Research Letters, 46(11), 5808-5816, https://doi.org/10.1029/2019GL082928
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Abstract:
The list attached contains physical properties (density, porosity, magnetic susceptibility, p-wave velocity and electrical resistivity) of seafloor massive sulphide, jasper and basalt samples. The seafloor samples have been obtained during cruise JC138, Mid-Atlantic Ridge, 26N (cruise report https://www.bodc.ac.uk/resources/inventories/cruise_inventory/report/16052/ ) in July 2016 and from onshore analogues. The data has been measured at the National Oceanography Centre under the lead of Dr Laurence North.
Coverage:
Median Latitude: 35.090665 * Median Longitude: -19.263519 * South-bound Latitude: 26.136577 * West-bound Longitude: -106.170000 * North-bound Latitude: 67.130000 * East-bound Longitude: 33.350000
Date/Time Start: 2008-05-25T00:00:00 * Date/Time End: 2017-06-07T00:00:00
Event(s):
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Gehrmann, Romina A S | |||
| 2 | Date/Time of event | Date/Time | Gehrmann, Romina A S | |||
| 3 | Latitude of event | Latitude | Gehrmann, Romina A S | |||
| 4 | Longitude of event | Longitude | Gehrmann, Romina A S | |||
| 5 | Sample ID | Sample ID | Gehrmann, Romina A S | |||
| 6 | Diameter | Ø | mm | Gehrmann, Romina A S | ||
| 7 | Length | l | mm | Gehrmann, Romina A S | ||
| 8 | Mass | Mass | g | Gehrmann, Romina A S | ||
| 9 | Density, mass density | Density | kg/m3 | Gehrmann, Romina A S | ||
| 10 | Porosity | Poros | % vol | Gehrmann, Romina A S | ||
| 11 | Magnetic susceptibility | MAGS | 10-6 SI | Gehrmann, Romina A S | ||
| 12 | Velocity, compressional wave | Vp | m/s | Gehrmann, Romina A S | ||
| 13 | Resistivity, electrical | Resist electr | Ohm m | Gehrmann, Romina A S | ||
| 14 | Logarithm | log | Gehrmann, Romina A S | of Resistivity | ||
| 15 | Description | Description | Gehrmann, Romina A S | |||
| 16 | Description 2 (continued) | Description 2 | Gehrmann, Romina A S |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
202 data points
Data
| 1 Event | 2 Date/Time | 3 Latitude | 4 Longitude | 5 Sample ID | 6 Ø [mm] | 7 l [mm] | 8 Mass [g] | 9 Density [kg/m3] | 10 Poros [% vol] | 11 MAGS [10-6 SI] | 12 Vp [m/s] | 13 Resist electr [Ohm m] | 14 log | 15 Description | 16 Description 2 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Theotokos_Monastery | 2017-06-07T00:00:00 | 35.0000 | 33.2500 | A | 25.04 | 18.47 | 21.52 | 2366 | 23.6 | 160000000 | 3520 | 7.10000 | 0.8510 | Altered vesicular basalt (Theotokos Monastery W of Kampia, Cyprus). The greenish coloured vesicle-rich basalt comprises pre-dominantly of plagioclase, chlorite and pyroxene relicts. While the majority of vesicles are empty, some are filled with calcite | |
| N-of-Kane | 2008-05-25T00:00:00 | 45.4800 | -27.8600 | B | 25.30 | 19.37 | 27.45 | 2819 | 6.5 | 30000000 | 5420 | 18.78000 | 1.2700 | Basalt (Mid-Atlantic N of Kane transform fault) Aphyric pillow basalt with plagioclase and olivine as pre-dominant phases. Traces of clinopyroxene, magnetite, ulvospinel and ilmenite are present. Overall copper concentration 67 ppm (Bryan et al 1981) | |
| Mathiatis_Mine | 2017-06-07T00:00:00 | 34.9800 | 33.3500 | C | 24.60 | 18.16 | 20.57 | 2383 | 20.3 | 170000000 | 3470 | 3.47000 | 0.5400 | Altered Basalt (Mathiatis Mine, Cyprus) Brownish-green coloured aphyric basalt with <5% amygdales that are field with quartz or zeolites in some places. The main mineralogy comprises of plagioclase and partially altered pyroxenes. | Minor amounts of pyrite can be observed in hand specimen. |
| Sulitjelma | 2017-03-21T00:00:00 | 67.1300 | 16.0800 | D | 25.33 | 19.26 | 40.66 | 4189 | 1.0 | 6000000 | 5240 | 0.00310 | -2.5200 | Massive pyritic Cu-(Zn) sulphide (Sulitjelma, Norway). The stratabound volcanic-exhalative sulphide mineralisation comprises pre-dominantly of porphyroblastic pyrite grains that are hosted in a chalcopyrite-(sphalerite) matrix. | Traces of chlorite, biotite and quartz might be present. The average copper concentration for sulphides from Sulitjelma is 1.25 % (Page 1963). |
| Chromite_Mine | 2017-06-07T00:00:00 | 34.9300 | 32.8700 | E | 25.04 | 19.64 | 27.21 | 2813 | 1.5 | 5600000 | 6100 | 1.26000 | 0.0991 | Gabbro (Chromite Mine Cyprus) Coarse grained rock comprising of plagioclase and pyroxene. Traces magnetite, ilmenite and ulvospinel are present. In addition magmatic sulphides such as chalcopyrite, pyrrhotite and pentlandite might be present. | Based on its vicinity to the chromite mine, chromite might also be an accessory mineral in the sample. |
| JC138-HyBIS21-2 | 2016-07-21T22:06:00 | 26.1557 | -44.8170 | F | 25.22 | 19.34 | 43.27 | 4479 | 9.1 | 500000 | 6100 | 0.00032 | -3.5000 | Massive pyrite (JC138-HyBIS21-2). The sampled sulphide comprises of pyrite and chalcopyrite with minor chalcocite being present. In some place micro-sized inclusions of sphalerite and/or chalcopyrite occur within the pyrite. | |
| JC138-HyBIS21-2 | 2016-07-21T22:06:00 | 26.1557 | -44.8170 | G | 25.22 | 18.83 | 41.79 | 4443 | 9.8 | 550000 | 6250 | 0.00038 | -3.4100 | Massive pyrite (JC138-HyBIS21-2). The sampled sulphide comprises of pyrite and chalcopyrite with minor chalcocite being present. In some place micro-sized inclusions of sphalerite and/or chalcopyrite occur within the pyrite. | |
| JC138-HyBIS41-1 | 2016-07-28T23:28:00 | 26.1569 | -44.8170 | H | 25.26 | 19.54 | 43.61 | 4454 | 9.8 | 690000 | 6450 | 0.00076 | -3.1200 | Massive pyrite (JC138 HyBIS41-1) This sample comprises of different shaped pyrite that is lined in some places by amorphous silica & surrounded by a mix of jarosite and alunite. Micro-inclusions of sphalerite & chalcopyrite can occur within the pyrite. | |
| JC138-HyBIS55-6 | 2016-08-03T08:45:00 | 26.1366 | -44.8263 | I | 25.18 | 19.53 | 22.96 | 2361 | 23.9 | 39000 | 3500 | 0.33000 | -0.4820 | Massive silica-coated pyrite (JC138-HyBIS55-6) The sampled massive sulphide comprises of brecciated pyrite clasts that are either hosted in a chalcopyrite matrix or are overgrown by marcasite and coated by a micrometre thin layer of amorphous silica. | |
| Kampia_Mine | 2017-06-07T00:00:00 | 35.0000 | 33.2500 | J | 25.00 | 18.98 | 26.78 | 2874 | 8.1 | 950000 | 2830 | 123.80000 | 2.0900 | Jasper (Kampia Mine, Cyprus) The red-brown jasperoidal sample comprises of hematite stained quartz. Traces of pyrite and chalcopyrite occur in this sample. | |
| Kampia_Mine | 2017-06-07T00:00:00 | 35.0000 | 33.2500 | K | 25.32 | 19.14 | 40.00 | 4151 | 8.4 | 2600000000 | 6280 | 0.39000 | -0.4100 | Massive pyrite (Kampia Mine, Cyprus) Massive VMS-type sulphide comprising of coarse grained pyrite cubes, traces of arsenopyrite, chalcopyrite and gypsum. | |
| Folldal_Mine | 2017-03-21T00:00:00 | 62.1400 | 9.9900 | L | 25.02 | 18.75 | 41.16 | 4465 | 0.6 | 90000000 | 6850 | 0.02900 | -1.5400 | Massive pyrite (Folldal Mine, Norway). Pyrite is the pre-dominant mineral in the stratabound massive sulphide deposit. Trace of chalcopyrite and sphalerite can be found interstitial to the pyrite. | Other minerals such as quartz, feldspar and chlorite might be present in the sample, however, their abundance varies. |
| JC138-050RD_11 | 2016-08-02T00:01:00 | 26.1556 | -44.8162 | M | 25.20 | 19.58 | 23.96 | 2453 | 13.0 | 290000 | 4800 | 33.90000 | 1.5300 | Jasper-silica-pyrite breccia (JC138-050RD_11) Vuggy jasper-silica breccia comprising of quartz (85 %), hematite (3 %), amorphous Fe-oxyhydroxide material and traces of pyrite. | |
| JC138-050RD_8 | 2016-08-02T00:01:00 | 26.1556 | -44.8162 | N | 25.24 | 19.59 | 19.12 | 1951 | 30.5 | 2300000 | 6000 | 20.30000 | 1.3100 | Mingled jasper (JC138-050RD_8) Orange coloured jasper comprising of goethite, quartz and amorphous Fe-oxyhydroxide material. | |
| JC138-065RD_16 | 2016-08-08T20:02:00 | 26.1562 | -44.8134 | O | 25.30 | 19.01 | 41.72 | 4365 | 8.8 | 1600000 | 6380 | 0.01500 | -1.8400 | Massive pyrite with chalcopyrite (JC138-065RD_16) The sample comprises of massive re-crystallised pyrite. Traces of chalcopyrite are present in layers at the top and bottom of the core piece. The copper concentration is 6120 ppm. | |
| JC138-073RD_7 | 2016-08-13T16:55:00 | 26.1434 | -44.8067 | P | 25.32 | 19.94 | 22.90 | 2281 | 15.2 | 2200000 | 4160 | 69.04000 | 1.8400 | Jasper (JC138-073RD_7) This sample comprises pre-dominantly of quartz that is coated by red-coloured hematite. Vug space is estimated to be 15 %. No sulphides are present in this sample. | |
| Mathiatis_Mine | 2017-06-07T00:00:00 | 34.9800 | 33.3500 | Q | 25.15 | 19.24 | 24.49 | 2562 | 0.9 | 280000 | 5200 | 6.81000 | 0.8330 | Silicified ocher/umber (Mathiatis Mine, Cyprus) This orange-brown coloured sample comprises of amorphous Fe-oxides, goethite, jarosite & quartz. Traces of hematite & pyrite can be observed in this sample that originated from marine weathering processes | |
| Chihuahua_state | 2017-03-21T00:00:00 | 28.6400 | -106.1700 | R | 25.37 | 18.73 | 35.77 | 3778 | 0.7 | 1100000 | 5110 | 23.09000 | 1.3600 | Massive sphalerite with chalcopyrite (Chihuahua state, Mexico) Massive sulphides form the carbonate hosted replacement deposit comprise of sphalerite and pyrite with traces of chalcopyrite and silicates being present |