Open AccessMagnetostratigraphy of the Miocene‐Pleistocene Surai Khola Siwaliks in West Nepal
Author(s) -
Appel E.,
Rösler W.,
Corvinus G.
Publication year - 1991
Publication title -
geophysical journal international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0956-540X
DOI - 10.1111/j.1365-246x.1991.tb03455.x
Subject(s) - magnetostratigraphy , geology , paleontology , clockwise , natural remanent magnetization , remanence , polarity (international relations) , sequence (biology) , pleistocene , paleomagnetism , fold (higher order function) , magnetization , mechanical engineering , physics , genetics , quantum mechanics , biology , magnetic field , engineering , cell
SUMMARY Magnetostratigraphic age dating has been carried out on sandstones of a well exposed continuous 5500 m thick Miocene‐Pleistocene section in the Surai Khola area (West Nepal). The section is situated in the Siwalik Range which consists of molasse sediments from the Himalaya. Progressive demagnetization and isothermal remanence experiments prove that haematite is the carrier of the characteristic remanent magnetization (ChRM) throughout the entire section. The final polarity sequence is based on 436 samples, of which 233 have normal and 203 reverse polarity. Antiparallel mean directions of the normally and reversely polarized samples indicate that the ChRM is of primary origin. Comparison of the polarity sequence with a standard polarity time‐scale yields a time period for the section between chron 1r or chron 2r (Matuyama) and probably chron 5AB (between 1–2 Myr and about 13 Myr).