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Rock magnetic and palaeomagnetic studies on the alkaline complexes of western Rajasthan, India

  • C Lakshmi NarasimhanEmail author
  • B R Arora
  • S K Patil
Article
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Abstract

Forty-five oriented block samples were collected from 12 sites of Mundwara and Sarnu-Dandali alkaline complexes of western Rajasthan for palaeomagnetic and rock magnetic investigations to constrain the timing of the emplacement of alkaline suites in relation to the time-frame of main Deccan volcanism. The rock magnetic studies indicated (titano) magnetite as the main magnetic carrier of stable remanence. The Lowrie–Fuller (L–F) test revealed SD and PSD type magnetic carrier in samples. AF and thermal demagnetizations were piloted on the samples to isolate Characteristic Remanent Magnetisation (ChRM) directions. The samples exhibited stable remanence between 5 and 35 mT during AFD. Thermal demagnetizations unblocked remanence between 350° and 500°C. The mean ChRM directions with Declm = 342, Inclm = –35 (α95 = 4.39, K = 121, N = 9) corresponds to paleopole position at 42°N and 274°E with a palaeo-latitude of 24.5°S is coincident with the Deccan Super pole position. The comparison of ChRM in alkaline complexes with those documented in DVP implies coeval emplacement of alkaline suites with Deccan eruption. Further, the ChRM marked largely by normal polarity suggests that alkaline intrusions were accomplished within the magnetic Chron C30N, during the onset of Deccan volcanism. The results also indicate that Deccan volcanism extended far beyond the present day boundaries of the traps, especially in the north.

Keywords

Alkaline complexes Indian plate reunion hotspot deccan super pole, paleomagnetism 

Notes

Acknowledgements

Authors are thankful to the Director, Indian Institute of Geomagnetism, Panvel, Navi Mumbai for the facilities and support provided during the work. Help provided by Prof. M K Pandit, University of Rajasthan, during field work is gratefully acknowledged. Mr K V V Satyanarayana and Mr Kishore Bhivande are thanked for their support during sample preparation and measurements. Authors acknowledge with gratitude the constructive comments from two reviewers that greatly helped presentation and interpretation of the results. Editor is thanked for his patience in extending the time for revisions.

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Copyright information

© Indian Academy of Sciences 2019

Authors and Affiliations

  1. 1.Department of GeologyAnna UniversityChennaiIndia
  2. 2.DehradunIndia
  3. 3.Dr. K S Krishnan Geomagnetic Research LaboratoryJhunsi, AllahabadIndia

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