Characterizing the source of a prominent magnetic anomaly in the southwestern part of the Cuddapah basin
The total magnetic intensity anomaly (TMI) map of the Proterozoic intracratonic Cuddapah basin shows the presence of a prominent high–low–high anomaly of about 600 nT amplitude at its southern end. The source of this anomaly is inferred to be a mafic intrusive body due to a thermal plume that might...
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| Vydáno v: | Journal of Earth System Science Ročník 129; číslo 1; s. 121 |
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New Delhi
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01.12.2020
Springer Nature B.V |
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| Abstract | The total magnetic intensity anomaly (TMI) map of the Proterozoic intracratonic Cuddapah basin shows the presence of a prominent high–low–high anomaly of about 600 nT amplitude at its southern end. The source of this anomaly is inferred to be a mafic intrusive body due to a thermal plume that might have initiated the basin evolution. Though some quantitative studies have been carried out over this anomaly, the magnetic body remains ambiguous as only a part of this anomaly was modelled along the E–W direction. In present study, we model this anomaly by a 2.5D algorithm and analytical signal of the vertical integral (ASVI) of the TMI approach. A near circular outline of the causative body has been delineated by the analysis of ASVI, which also revealed three characteristic zones of the near surface irregularities. The 2.5D modelling along a SW–NE profile across the anomaly yielded the main body of about 10 km wide top at 3.5 km depth and 40 km wide at 25 km depth. The Curie temperature depth in this region is 30–40 km and this allows the source to be magnetic at this depth. It is inferred from both ASVI and modelling that the main body is bifurcated into two in its south-western part between Parnapalle and Muddanuru while it attains a lopolithic shape over the remaining part. Existing regional aeromagnetic data elucidates shape of the mafic intrusive both laterally and vertically. |
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| AbstractList | The total magnetic intensity anomaly (TMI) map of the Proterozoic intracratonic Cuddapah basin shows the presence of a prominent high–low–high anomaly of about 600 nT amplitude at its southern end. The source of this anomaly is inferred to be a mafic intrusive body due to a thermal plume that might have initiated the basin evolution. Though some quantitative studies have been carried out over this anomaly, the magnetic body remains ambiguous as only a part of this anomaly was modelled along the E–W direction. In present study, we model this anomaly by a 2.5D algorithm and analytical signal of the vertical integral (ASVI) of the TMI approach. A near circular outline of the causative body has been delineated by the analysis of ASVI, which also revealed three characteristic zones of the near surface irregularities. The 2.5D modelling along a SW–NE profile across the anomaly yielded the main body of about 10 km wide top at 3.5 km depth and 40 km wide at 25 km depth. The Curie temperature depth in this region is 30–40 km and this allows the source to be magnetic at this depth. It is inferred from both ASVI and modelling that the main body is bifurcated into two in its south-western part between Parnapalle and Muddanuru while it attains a lopolithic shape over the remaining part. Existing regional aeromagnetic data elucidates shape of the mafic intrusive both laterally and vertically. The total magnetic intensity anomaly (TMI) map of the Proterozoic intracratonic Cuddapah basin shows the presence of a prominent high–low–high anomaly of about 600 nT amplitude at its southern end. The source of this anomaly is inferred to be a mafic intrusive body due to a thermal plume that might have initiated the basin evolution. Though some quantitative studies have been carried out over this anomaly, the magnetic body remains ambiguous as only a part of this anomaly was modelled along the E–W direction. In present study, we model this anomaly by a 2.5D algorithm and analytical signal of the vertical integral (ASVI) of the TMI approach. A near circular outline of the causative body has been delineated by the analysis of ASVI, which also revealed three characteristic zones of the near surface irregularities. The 2.5D modelling along a SW–NE profile across the anomaly yielded the main body of about 10 km wide top at 3.5 km depth and 40 km wide at 25 km depth. The Curie temperature depth in this region is 30–40 km and this allows the source to be magnetic at this depth. It is inferred from both ASVI and modelling that the main body is bifurcated into two in its south-western part between Parnapalle and Muddanuru while it attains a lopolithic shape over the remaining part. Existing regional aeromagnetic data elucidates shape of the mafic intrusive both laterally and vertically. |
| ArticleNumber | 121 |
| Author | Manglik, A Seshu, D Lakshmi, M Prasanthi Begum, S Parveen |
| Author_xml | – sequence: 1 givenname: D surname: Seshu fullname: Seshu, D organization: CSIR-National Geophysical Research Institute – sequence: 2 givenname: M Prasanthi surname: Lakshmi fullname: Lakshmi, M Prasanthi email: prasu_mp@rediffmail.com organization: CSIR-National Geophysical Research Institute – sequence: 3 givenname: S Parveen surname: Begum fullname: Begum, S Parveen organization: CSIR-National Geophysical Research Institute – sequence: 4 givenname: A surname: Manglik fullname: Manglik, A organization: CSIR-National Geophysical Research Institute |
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| Cites_doi | 10.1016/0040-1951(82)90050-6 10.1190/1.1442298 10.1190/1.1441045 10.1016/j.epsl.2009.02.013 10.4236/ijg.2011.24063 10.1071/EG993679 10.1190/1.1440356 10.1190/1.1440276 10.1016/j.jseaes.2017.11.026 10.1016/S1342-937X(05)71077-7 10.1007/BF01674063 10.1190/1.1439646 10.1190/1.1440223 10.1190/1.1437537 10.1029/JZ064i001p00049 10.1137/0111030 10.1016/j.jseaes.2010.10.006 10.1190/1.1439658 10.1190/1.1441706 10.1111/j.1365-246X.2007.03623.x 10.1016/0040-1951(93)90148-D 10.1016/j.gsf.2013.03.003 10.3997/2214-4609-pdb.324.830 10.1016/j.gr.2011.03.009 10.1017/CBO9781139167932 10.1007/BF02702905 10.3133/ofr77463 |
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| Keywords | mafic intrusion Total magnetic intensity anomaly Cuddapah basin 2.5D modelling |
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| SubjectTerms | Algorithms Curie temperature Depth Earth and Environmental Science Earth Sciences Geology Heated water Magnetic anomalies Magnetic intensity Modelling Plate tectonics Precambrian Quantitative research Shape Space Exploration and Astronautics Space Sciences (including Extraterrestrial Physics Thermal plumes Trends Velocity |
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| Title | Characterizing the source of a prominent magnetic anomaly in the southwestern part of the Cuddapah basin |
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