Magnetic polarity stratigraphy of the Siwalik sequence in Nurpur area, NW Himalaya, India

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• 作者：M Venkateshwarlu
• 关键词：Magnetic polarity stratigraphy ; GPTS ; Siwaliks ; Nurpur ; Himachal Pradesh.
• 刊名：Journal of Earth System Science
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：124
• 期：6
• 页码：1177-1185
• 全文大小：1,497 KB
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• 作者单位：M Venkateshwarlu (1)
  
  1. Geochronology (TIMS) and Palaeomagnetism Studies, CSIR–National Geophysical Research Institute, Uppal Road, Hyderabad, 500 007, 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

Magnetic polarity stratigraphy studies were carried out on Jabbar Khad section of Nurpur area, Kangra District, Himachal Pradesh, India. Oriented block samples were collected at 202 sites with 3- samples per site from a 2350-m thick continuous sedimentary sequence consisting of sandstone–mudstone alternating beds. Specimens were subjected to thermal demagnetization (100-00?/sup>C) after measuring their natural remanent magnetization (NRM). Palaeolatitudes of virtual geomagnetic pole (VGP) from each site were calculated from the acquired characteristic remanent magnetization (ChRM) directions. The observed remanence carrier could be haematite. Magnetic polarity scale (MPS) was erected. This MPS is correlated with the standard geomagnetic polarity time scale (GPTS) of Lourens et al. (2004). The MPS readily matched from chron C2An.1n to chron C4n.2n, therefore assigning an age 8.20-.60 Ma to the middle and upper Siwalik sections at Nurpur. The rate of sedimentation in middle Siwalik is 29 mm/yr and upper Siwalik is 59 mm/yr. Keywords Magnetic polarity stratigraphy GPTS Siwaliks Nurpur Himachal Pradesh.