Paleointensity study of Early Miocene lavas from Pingzhuang, Inner Mongolia, China

Details Paleointensity study of Early Miocene lavas from Pingzhuang, Inner Mongolia, China Paleointensity study of Early Miocene lavas from Pingzhuang, Inner Mongolia, China

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29u..22s&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 21, pp. 22-1, CiteID 2026, DOI 10.1029/2002GL015990

Mathematics

Logic

2

Geomagnetism And Paleomagnetism: Magnetic Mineralogy And Petrology, Geomagnetism And Paleomagnetism: Paleointensity, Geomagnetism And Paleomagnetism: Paleomagnetic Secular Variation, Geomagnetism And Paleomagnetism: Rock And Mineral Magnetism, Geomagnetism And Paleomagnetism: Time Variations-Secular And Long Term

Scientific paper

A paleomagnetic and geochronologic investigation has been conducted on 17 lava flows from Inner Mongolia, north China. Radiometric K-Ar dating experiments give an age between 23 and 22 Ma for these volcanic units. Rock magnetic measurements of thermomagnetic curves and hysteresis loops show the primary carrier of remanence to be pseudo-single domain titanomagnetite. Stepwise thermal demagnetization isolated a well-defined direction of characteristic remanent magnetization (ChRM) in all studied lava flows with a mean direction of D/I = 359.8°/62.2° (α95 = 3.8°). Fifty samples from 11 lavas were pre-selected on the basis of thermomagnetic analyses to carry out Thellier-Thellier paleointensity experiments with systematic partial thermoremanent magnetization (pTRM) checks. Twenty-three samples from 7 lavas yield reliable paleointensity estimates with a mean virtual dipole moment (VDM) of (3.9 +/- 0.9) × 1022 Am2, about half the strength of the modern-day field.

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