A palaeomagnetic study of Upper Pliocene volcanic rocks in the area of the Levant Fault near Homs, western Syria
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| Format: | Artículo científico |
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Universidad Nacional Autónoma de México
2005
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| _version_ | 1876444741398167552 |
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| author | J. M. Abou-Deeb |
| author_facet | J. M. Abou-Deeb |
| contents | A palaeomagnetic study of Upper Pliocene volcanic rocks in the area of the Levant Fault near Homs, western Syria J. M. Abou-Deeb D. H. Tarling Ciencias de la Tierra Syria Lebanon Levant Fault Upper Pliocene Palaeomagnetism Thermal demagnetisation of samples from 75 sites in basaltic rocks, mostly within 5 km of the Levant Fault, identifiesconsistent directions of remanence in most sites. Normal, Reversed and Intermediate polarities are identified, with Reversedpolarities dominating. The Normal and Reversed sites are similarly magnetised, 5.6±5.3 A/m, while those of sites of Intermediateor undefined direction are somewhat more strongly magnetised, 11.9±9.5 A/m. The low field susceptibilities are consistent, 30.9±15.2mSI, implying the geomagnetic field may have been somewhat stronger than during Normal or Reversed polarity. When the meandirections of the Normal sites are reversed, all sites have similar mean inclination values, 48.2° (δInc. = 2.7°), but the site meandeclinations show a regional pattern. Sites from the 3 regions west of the Levant Fault zone (Marmarita, Qalat El-Hossen, TelKalakh) have similar declinations, 186° (δDec. = 5.4°). These are consistent with those from the Sufer and E. Ain Kut regions,197° (δDec. = 3.9°), furthest east of the Levant Fault zone. All these localities have directions that are consistent with thoseexpected for this part of Arabia for this time. However, all sites east and close to the Levant Fault zone (Bahur, W. Ain-Kut,Mzeineh and Buqeia) have more eastern declinations, averaging 154.0±12.0°. The declination difference, 37.3°, indicates thepresence of rotated blocks adjacent to the eastern side of the Levant Fault. Such a rotation is consistent with the 25 km displacementpredicted for this location and appears consistent with the subsequent volcanological and tectonic evolution of the LevantFault, suggesting significant rotation and seismic activity during the last 5 Ma. 2005 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56844301 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.3 Vol.44 |
| format | Artículo científico |
| id | redalyc_56844301 |
| institution | Redalyc |
| language | en |
| publishDate | 2005 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | A palaeomagnetic study of Upper Pliocene volcanic rocks in the area of the Levant Fault near Homs, western Syria J. M. Abou-Deeb Ciencias de la Tierra Syria Lebanon Levant Fault Upper Pliocene Palaeomagnetism A palaeomagnetic study of Upper Pliocene volcanic rocks in the area of the Levant Fault near Homs, western Syria J. M. Abou-Deeb D. H. Tarling Ciencias de la Tierra Syria Lebanon Levant Fault Upper Pliocene Palaeomagnetism Thermal demagnetisation of samples from 75 sites in basaltic rocks, mostly within 5 km of the Levant Fault, identifiesconsistent directions of remanence in most sites. Normal, Reversed and Intermediate polarities are identified, with Reversedpolarities dominating. The Normal and Reversed sites are similarly magnetised, 5.6±5.3 A/m, while those of sites of Intermediateor undefined direction are somewhat more strongly magnetised, 11.9±9.5 A/m. The low field susceptibilities are consistent, 30.9±15.2mSI, implying the geomagnetic field may have been somewhat stronger than during Normal or Reversed polarity. When the meandirections of the Normal sites are reversed, all sites have similar mean inclination values, 48.2° (δInc. = 2.7°), but the site meandeclinations show a regional pattern. Sites from the 3 regions west of the Levant Fault zone (Marmarita, Qalat El-Hossen, TelKalakh) have similar declinations, 186° (δDec. = 5.4°). These are consistent with those from the Sufer and E. Ain Kut regions,197° (δDec. = 3.9°), furthest east of the Levant Fault zone. All these localities have directions that are consistent with thoseexpected for this part of Arabia for this time. However, all sites east and close to the Levant Fault zone (Bahur, W. Ain-Kut,Mzeineh and Buqeia) have more eastern declinations, averaging 154.0±12.0°. The declination difference, 37.3°, indicates thepresence of rotated blocks adjacent to the eastern side of the Levant Fault. Such a rotation is consistent with the 25 km displacementpredicted for this location and appears consistent with the subsequent volcanological and tectonic evolution of the LevantFault, suggesting significant rotation and seismic activity during the last 5 Ma. 2005 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56844301 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.3 Vol.44 |
| title | A palaeomagnetic study of Upper Pliocene volcanic rocks in the area of the Levant Fault near Homs, western Syria |
| topic | Ciencias de la Tierra Syria Lebanon Levant Fault Upper Pliocene Palaeomagnetism |
| url | https://www.redalyc.org/articulo.oa?id=56844301 |