Physics
Scientific paper
Apr 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005geoji.161...57t&link_type=abstract
Geophysical Journal International, Volume 161, Issue 12, pp. 57-64.
Physics
Scientific paper
High coercivity but low unblocking (LB) temperature components (~80-100 °C) demonstrate that goethite is the principal carrier of the natural remanent magnetization (NRM) in Jurassic and Cretaceous limestone from the Jaisalmer basin (Rajasthan, NW India). Goethite-bearing components (declination = 359.9°, inclination = 46.0°, α95= 4.0°, N = 10 sites) plot close to the present day field direction. High unblocking (HB) components (declination = 172.0°, inclination =-45.6°, α95= 9.1°, N = 7 sites) are carried by haematite, mostly with reverse polarity directions, but undoubtedly not primary. This remagnetization event, mostly within a period of reverse magnetic polarity, occurred after 35 Ma and before 780 000 yr (the last known reversal). Only palaeomagnetic data from a single Cretaceous site (declination = 302.0°, inclination =-47.2°, α95= 14.0°, N = 10 samples) has potentially preserved a primary magnetization (carried by normal polarity magnetite); if correct, this site substantiates a mid-southerly palaeolatitude for India during mid-Aptian times (~117 Ma).
Ashwal Lewis D.
Pandit Manoj K.
Redfield T. F.
Torsvik Trond Helge
Webb Susan J.
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