Mineral magnetic characterization of the Godavari river sediments: Implications to Deccan basalt weathering

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• 作者：Y. R. Kulkarni (1)
  S. J. Sangode (1)
  D. C. Meshram (1)
  S. K. Patil (2)
  Yatindra Dutt (1)
  
• 关键词：Godavari river ; Mineral magnetism ; Deccan basalt weathering
• 刊名：Journal of the Geological Society of India
• 出版年：2014
• 出版时间：April 2014
• 年：2014
• 卷：83
• 期：4
• 页码：376-384
• 全文大小：
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• 作者单位：Y. R. Kulkarni (1)
  S. J. Sangode (1)
  D. C. Meshram (1)
  S. K. Patil (2)
  Yatindra Dutt (1)
  
  1. Department of geology, University of Pune, Pune, 411 007, India
  2. Dr. K.S. Krishnan Geomagnetic Research Laboratory (IIG), Allahabad, 221 505, India
  
• ISSN：0974-6889

文摘

Mineral magnetic analysis including thermo-magnetic studies and clay mineralogy on bed load and floodplain sediments from the Godavari river indicate distinct mineral assemblages. The floodplain sediments up to the delta region are characterised by unimodal ferrimagnetic mineralogy marked by the presence of maghemite and single domain magnetites derived from Deccan basalts. On the other hand the bed loads show varied magnetic mineral assemblages depicting greater local mixing from the non-basaltic bedrock province. The temperature dependent magnetic susceptibility and clay mineralogy of the floodplain samples show titanomagnetites (Fe3O4-Fe2TiO4), maghemite (χ LF-Fe2O3) and smectite that are characteristic of the Deccan Volcanic Province (DVP). Presence of this ferrimagnetically dominant unimodal assemblage up to the delta region and probably into the Bay of Bengal off the Godavari river is attributed to extensive chemical weathering of the basalt. The quantitative approach of mineral magnetism, therefore, can be used to study the paleomonsoon variability and its relation to Deccan basalt weathering from the Godavari-Bengal fan system.