Silantyev, Sergey A; Karpenko, Sergey F; Belyatsky, Boris V (2000): (Table 1) Isotopic composition of Sm and Nd in mantle restites of the Central Atlantic and in associated plutonic and volcanic rocks [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.744795
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Abstract:
Ultrabasic rock samples collected from two areas of the crustal zone of the Mid-Atlantic Ridge (MAR): (1) 13-17°N (near the intersection of the ridge axis with the 15°20'N prime fracture zone), and (2) 33°40'N prime (the western intersection of the MAR crest with the Heis fracture zone) were objects of this study. Samples of peridotite and of plutonic and volcanic rocks associated with it were used to measure their Sm/Nd, 143Nd/144Nd, and 147Sm/144Nd ratios, which allowed to test time and genetic relationships between evolution of mantle material under the ridge crest and products of its magmatic activity. Results of this work proved ubiquitous discrepancy between melting degree values of extremely depleted mantle peridotites in the MAR area between 14°N and 16°N, obtained using petrologic and geochemical methods. This discrepancy suggests large-scale interaction between mantle material and magmatic melts and fluids enriched in incompatible elements or fluids. The results obtained suggest that repeated melting of the mantle under the axial MAR zone is an universal characteristic of magmatism in low-velocity spreading centers. The results of this study also proved the crestal MAR zone in the Central Atlantic region show distinct indications of isotope-geochemical segmentation of the mantle. It is suggested that the geochemically anomalous MAR mantle peridotite in the zone of the MAR intersection with the 15°20'N prime fracture zone can be interpreted as fragments of mantle substrate, foreign for the Atlantic mantle north of the equator.
Related to:
Silantyev, Sergey A; Karpenko, Sergey F; Belyatsky, Boris V (2000): Mantle substrate evolution of the Mid-Atlantic Ridge 14-16°N and 33°40'N: Time and matter limitations of accretion processes of the oceanic lithosphere from data of Sm-Nd isotope system research. Russian Journal of Earth Sciences, 2(3), 227-242
Project(s):
Archive of Ocean Data (ARCOD)
Coverage:
Median Latitude: 18.933347 * Median Longitude: -44.236660 * South-bound Latitude: 14.816700 * West-bound Longitude: -46.666700 * North-bound Latitude: 33.650000 * East-bound Longitude: -38.900000
Event(s):
BP16-25 * Latitude: 33.650000 * Longitude: -38.900000 * Location: Atlantic Ocean * Campaign: BP16 * Basis: Akademik Boris Petrov * Method/Device: Dredge (DRG)
BP16-68 * Latitude: 14.816700 * Longitude: -45.083300 * Location: Central Atlantic * Campaign: BP16 * Basis: Akademik Boris Petrov * Method/Device: Dredge (DRG)
BP16-71 * Latitude: 15.083333 * Longitude: -44.000000 * Location: Central Atlantic * Campaign: BP16 * Basis: Akademik Boris Petrov * Method/Device: Dredge (DRG)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Latitude of event | Latitude | ||||
| 3 | Longitude of event | Longitude | ||||
| 4 | Sample code/label | Sample label | Silantyev, Sergey A | |||
| 5 | Rock type | Rock | Silantyev, Sergey A | |||
| 6 | Sample position | Samp pos | Silantyev, Sergey A | |||
| 7 | Samarium/Neodymium ratio | Sm/Nd | Silantyev, Sergey A | Calculated | ||
| 8 | Neodymium-143/Neodymium-144 ratio | 143Nd/144Nd | Silantyev, Sergey A | Isotope ratio mass spectrometry | ||
| 9 | Neodymium-143/Neodymium-144 ratio, error | 143Nd/144Nd e | ± | Silantyev, Sergey A | Calculated | |
| 10 | Samarium-147/Neodymium-144 ratio | 147Sm/144Nd | Silantyev, Sergey A | Isotope ratio mass spectrometry |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
105 data points
Data
| 1 Event | 2 Latitude | 3 Longitude | 4 Sample label | 5 Rock | 6 Samp pos | 7 Sm/Nd | 8 143Nd/144Nd | 9 143Nd/144Nd e [±] | 10 147Sm/144Nd |
|---|---|---|---|---|---|---|---|---|---|
| BP16-25 | 33.6500 | -38.9000 | BP16-25-1 | basic amphibole schist | western intersection of the MAR and Heis fracture zone at 33°40´N | 0.290 | 0.513281 | 8 | 0.1760 |
| BP16-25 | 33.6500 | -38.9000 | BP16-25-2 | metaperidotite | western intersection of the MAR and Heis fracture zone at 33°40´N | 0.384 | 0.513121 | 14 | 0.2325 |
| BP16-25 | 33.6500 | -38.9000 | BP16-25-29 | metaperidotite | western intersection of the MAR and Heis fracture zone at 33°40´N | 0.584 | 0.513257 | 217 | 0.3532 |
| BP16-25 | 33.6500 | -38.9000 | BP16-25-4 | metaperidotite | western intersection of the MAR and Heis fracture zone at 33°40´N | 0.341 | 0.512579 | 114 | 0.2053 |
| BP16-68 | 14.8167 | -45.0833 | BP16-68-20 | harzburgite | MAR segment to the south of the 15°20´N fracture zone, western flange of the rift valley | 0.219 | 0.512509 | 15 | 0.1327 |
| BP16-71 | 15.0833 | -44.0000 | BP16-71-145 | harzburgite | MAR segment to the south of the 15°20´N fracture zone, southern inner angular uplift | 0.256 | 0.512422 | 26 | 0.1386 |
| BP16-71 | 15.0833 | -44.0000 | BP16-71-187 | harzburgite | MAR segment to the south of the 15°20´N fracture zone, southern inner angular uplift | 0.175 | 0.512387 | 24 | 0.1068 |
| BP16-71 | 15.0833 | -44.0000 | BP16-71-202 | brecciated carbonatized dunite | MAR segment to the south of the 15°20´N fracture zone, southern inner angular uplift | 0.220 | 0.512459 | 13 | 0.1337 |
| BP16-71 | 15.0833 | -44.0000 | BP16-71-23 | dunite | MAR segment to the south of the 15°20´N fracture zone, southern inner angular uplift | 0.177 | 0.512439 | 26 | 0.1034 |
| BP16-71 | 15.0833 | -44.0000 | BP16-71-71 | dunite | MAR segment to the south of the 15°20´N fracture zone, southern inner angular uplift | 0.220 | 0.512334 | 21 | 0.1312 |
| F12 | 15.6167 | -46.5333 | F12-02 | normal gabbro | MAR segment to the south of the 15°20´N fracture zone, eastern flange of the rift valley | 0.409 | 0.513044 | 16 | 0.2478 |
| F12 | 15.6167 | -46.5333 | F12-04 | phlogopite dunite | MAR segment to the south of the 15°20´N fracture zone, eastern flange of the rift valley | 0.217 | 0.512142 | 16 | 0.1315 |
| F12 | 15.6167 | -46.5333 | F12-05 | gneissous gabbro with biotite | MAR segment to the south of the 15°20´N fracture zone, eastern flange of the rift valley | 0.319 | 0.513214 | 18 | 0.1935 |
| F12 | 15.6167 | -46.5333 | F12-11 | aphyric basalt | MAR segment to the south of the 15°20´N fracture zone, eastern flange of the rift valley | 0.304 | 0.513144 | 8 | 0.1845 |
| F16 | 15.5000 | -46.6667 | F16-07 | harzburgite | MAR segment to the south of the 15°20´N fracture zone, eastern flange of the rift valley | 0.154 | 0.512921 | 27 | 0.0936 |