Interpretation of the gravity and magnetic anomalies of the ajdabiya trough in the sirt basin, libya

Ahmed Salem Saheel, Abdul Rahim Samsudin, Umar Hamzah

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The area involved in this study is north part of Libya, which is located in the northeast part of Sirt basin within the bounds 29°N-31°N and 19°E-21°E. The study involves analysis of gravity and magnetic data to delineate structures and faults and to locate any major structures in the Ajdabiya trough and surrounding area. The produced Bouguer gravity map shows prominent NW-SE and NE-SW trends. Isostatic residual map for gravity data is characterized by a dominant NW-SE trend in the study area. This is clearly evident in the Isostatic residual map. The main trending anomalies are in the northern and southeastern parts of the study area with NW-SE orientation. A strong NWSE trend is truncated by E-W trending in the southeastern and southwestern parts of the area. This is consistent with the change of tectonic zones. The magnetic expression in the northern part of Ajdabiya trough is characterized by NW-SE trending structures which coincide with late Cretaceous structures of the Sirt basin, while the southern part is characterized by NE-SW trending features which coincide with a late Paleozoic trend. The northern part of the Ajdabiya trough is separated from the southern part by a prominent NE-SW lineament that is expressed in both the gravity and magnetic data. It is interpreted as a basement fault, which separates a thicker southern crust from a thinner northern crust. The high gravity anomaly within the northern part of the Ajdabiya trough is interpreted as a result of mantle upwelling which caused thinning of the continental crust beneath the northern part of the Ajdabiya trough. Total horizontal derivative of the gravity and magnetic RTP anomalies generally reflect faults or compositional changes which can be seen to describe structural trends. High gradient values delineate NNE-SSW and NW-SE trends which mark the faulted southwestern and northeastern boundaries of the basin, respectively. Strong N-S lineaments occur over the Central part of study area and are well indicated by the horizontal derivative. From this study, the horizontal derivative provides very useful information of the rift structures.

Original languageEnglish
Pages (from-to)316-330
Number of pages15
JournalEuropean Journal of Scientific Research
Volume43
Issue number3
Publication statusPublished - 2010

Fingerprint

Libya
Gravitation
gravity anomaly
magnetic anomaly
gravity
Anomaly
Gravity
trough
basins
basin
Fault
Horizontal
Derivatives
lineament
Derivative
Hypergravity
crust
Thinning
tectonics
Tectonics

Keywords

  • Ajdabiya trough
  • Gravity data
  • Magnetic data
  • Sirt basin
  • Total horizontal derivative

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Earth and Planetary Sciences(all)
  • Engineering(all)
  • Materials Science(all)
  • Mathematics(all)
  • Computer Science(all)

Cite this

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abstract = "The area involved in this study is north part of Libya, which is located in the northeast part of Sirt basin within the bounds 29°N-31°N and 19°E-21°E. The study involves analysis of gravity and magnetic data to delineate structures and faults and to locate any major structures in the Ajdabiya trough and surrounding area. The produced Bouguer gravity map shows prominent NW-SE and NE-SW trends. Isostatic residual map for gravity data is characterized by a dominant NW-SE trend in the study area. This is clearly evident in the Isostatic residual map. The main trending anomalies are in the northern and southeastern parts of the study area with NW-SE orientation. A strong NWSE trend is truncated by E-W trending in the southeastern and southwestern parts of the area. This is consistent with the change of tectonic zones. The magnetic expression in the northern part of Ajdabiya trough is characterized by NW-SE trending structures which coincide with late Cretaceous structures of the Sirt basin, while the southern part is characterized by NE-SW trending features which coincide with a late Paleozoic trend. The northern part of the Ajdabiya trough is separated from the southern part by a prominent NE-SW lineament that is expressed in both the gravity and magnetic data. It is interpreted as a basement fault, which separates a thicker southern crust from a thinner northern crust. The high gravity anomaly within the northern part of the Ajdabiya trough is interpreted as a result of mantle upwelling which caused thinning of the continental crust beneath the northern part of the Ajdabiya trough. Total horizontal derivative of the gravity and magnetic RTP anomalies generally reflect faults or compositional changes which can be seen to describe structural trends. High gradient values delineate NNE-SSW and NW-SE trends which mark the faulted southwestern and northeastern boundaries of the basin, respectively. Strong N-S lineaments occur over the Central part of study area and are well indicated by the horizontal derivative. From this study, the horizontal derivative provides very useful information of the rift structures.",
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T1 - Interpretation of the gravity and magnetic anomalies of the ajdabiya trough in the sirt basin, libya

AU - Saheel, Ahmed Salem

AU - Samsudin, Abdul Rahim

AU - Hamzah, Umar

PY - 2010

Y1 - 2010

N2 - The area involved in this study is north part of Libya, which is located in the northeast part of Sirt basin within the bounds 29°N-31°N and 19°E-21°E. The study involves analysis of gravity and magnetic data to delineate structures and faults and to locate any major structures in the Ajdabiya trough and surrounding area. The produced Bouguer gravity map shows prominent NW-SE and NE-SW trends. Isostatic residual map for gravity data is characterized by a dominant NW-SE trend in the study area. This is clearly evident in the Isostatic residual map. The main trending anomalies are in the northern and southeastern parts of the study area with NW-SE orientation. A strong NWSE trend is truncated by E-W trending in the southeastern and southwestern parts of the area. This is consistent with the change of tectonic zones. The magnetic expression in the northern part of Ajdabiya trough is characterized by NW-SE trending structures which coincide with late Cretaceous structures of the Sirt basin, while the southern part is characterized by NE-SW trending features which coincide with a late Paleozoic trend. The northern part of the Ajdabiya trough is separated from the southern part by a prominent NE-SW lineament that is expressed in both the gravity and magnetic data. It is interpreted as a basement fault, which separates a thicker southern crust from a thinner northern crust. The high gravity anomaly within the northern part of the Ajdabiya trough is interpreted as a result of mantle upwelling which caused thinning of the continental crust beneath the northern part of the Ajdabiya trough. Total horizontal derivative of the gravity and magnetic RTP anomalies generally reflect faults or compositional changes which can be seen to describe structural trends. High gradient values delineate NNE-SSW and NW-SE trends which mark the faulted southwestern and northeastern boundaries of the basin, respectively. Strong N-S lineaments occur over the Central part of study area and are well indicated by the horizontal derivative. From this study, the horizontal derivative provides very useful information of the rift structures.

AB - The area involved in this study is north part of Libya, which is located in the northeast part of Sirt basin within the bounds 29°N-31°N and 19°E-21°E. The study involves analysis of gravity and magnetic data to delineate structures and faults and to locate any major structures in the Ajdabiya trough and surrounding area. The produced Bouguer gravity map shows prominent NW-SE and NE-SW trends. Isostatic residual map for gravity data is characterized by a dominant NW-SE trend in the study area. This is clearly evident in the Isostatic residual map. The main trending anomalies are in the northern and southeastern parts of the study area with NW-SE orientation. A strong NWSE trend is truncated by E-W trending in the southeastern and southwestern parts of the area. This is consistent with the change of tectonic zones. The magnetic expression in the northern part of Ajdabiya trough is characterized by NW-SE trending structures which coincide with late Cretaceous structures of the Sirt basin, while the southern part is characterized by NE-SW trending features which coincide with a late Paleozoic trend. The northern part of the Ajdabiya trough is separated from the southern part by a prominent NE-SW lineament that is expressed in both the gravity and magnetic data. It is interpreted as a basement fault, which separates a thicker southern crust from a thinner northern crust. The high gravity anomaly within the northern part of the Ajdabiya trough is interpreted as a result of mantle upwelling which caused thinning of the continental crust beneath the northern part of the Ajdabiya trough. Total horizontal derivative of the gravity and magnetic RTP anomalies generally reflect faults or compositional changes which can be seen to describe structural trends. High gradient values delineate NNE-SSW and NW-SE trends which mark the faulted southwestern and northeastern boundaries of the basin, respectively. Strong N-S lineaments occur over the Central part of study area and are well indicated by the horizontal derivative. From this study, the horizontal derivative provides very useful information of the rift structures.

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KW - Magnetic data

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KW - Total horizontal derivative

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