Crustal structure and rift tectonics across the Cauvery–Palar basin, Eastern Continental Margin of India based on seismic and potential field modelling

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• 作者：D TWINKLE ; G SRINIVASA RAO ; M RADHAKRISHNA ; K S R MURTHY
• 关键词：Crustal structure ; gravity and magnetic ; seismic ; Cauvery–Palar basin ; Eastern Continental Margin of India (ECMI).
• 刊名：Journal of Earth System Science
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：125
• 期：2
• 页码：329-342
• 全文大小：7,591 KB
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• 作者单位：D TWINKLE (1)
  G SRINIVASA RAO (1)
  M RADHAKRISHNA (1)
  K S R MURTHY (2)
  
  1. Department of Earth Sciences, Indian Institute of Technology Bombay, Powai, Mumbai, 400 076, India.
  2. CSIR - National Institute of Oceanography, Regional Centre, Lawson’s Bay Colony, Visakhapatnam, 530 003, India.
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geosciences
  Extraterrestrial Physics and Space Sciences
  
• 出版者：Springer India
• ISSN：0973-774X

文摘

The Cauvery–Palar basin is a major peri-cratonic rift basin located along the Eastern Continental Margin of India (ECMI) that had formed during the rift-drift events associated with the breakup of eastern Gondwanaland (mainly India–Sri Lanka–East Antarctica). In the present study, we carry out an integrated analysis of the potential field data across the basin to understand the crustal structure and the associated rift tectonics. The composite-magnetic anomaly map of the basin clearly shows the onshore-to-offshore structural continuity, and presence of several high-low trends related to either intrusive rocks or the faults. The Curie depth estimated from the spectral analysis of offshore magnetic anomaly data gave rise to 23 km in the offshore Cauvery–Palar basin. The 2D gravity and magnetic crustal models indicate several crustal blocks separated by major structures or faults, and the rift-related volcanic intrusive rocks that characterize the basin. The crustal models further reveal that the crust below southeast Indian shield margin is ∼36 km thick and thins down to as much as 13–16 km in the Ocean Continent Transition (OCT) region and increases to around 19–21 km towards deep oceanic areas of the basin. The faulted Moho geometry with maximum stretching in the Cauvery basin indicates shearing or low angle rifting at the time of breakup between India–Sri Lanka and the East Antarctica. However, the additional stretching observed in the Cauvery basin region could be ascribed to the subsequent rifting of Sri Lanka from India. The abnormal thinning of crust at the OCT is interpreted as the probable zone of emplaced Proto-Oceanic Crust (POC) rocks during the breakup. The derived crustal structure along with other geophysical data further reiterates sheared nature of the southern part of the ECMI.