TY - JOUR
AU - Noltimier, H., C.
AB - Summary The 1320 My Spavinaw granite from north-eastern Oklahoma is strongly magnetized, averaging about 10−2 emu cm−3. The NRM directions are randomly oriented: steep and shallow, positive and negative inclinations are equally represented. Although very fine grained titanomagnetite and haematite are primary Fe-Ti oxides, demagnetization generally produces no change from the initial NRM directions whether up to 660 °C or in 1400 Oe peak A.F. This tends to rule out large amounts of secondary magnetization and self-reversal, particularly as there are no apparent compositional variations throughout the granite. We discount lightning because the same magnetic features are shown by samples from all the surface exposures, as well as by subsurface samples from deep wells. Among possible, but unsubstantiated, explanations are: (1) the NRM may be due to stable viscous components which have been acquired throughout the granite over an interval of the order of 109 years, (2) the granite may have recorded multiple reversals of the Precambrian field during cooling, and (3) there was some form of random motion in the crystal mush below 600°C, possibly associated with the injection of multiple granite sills. References 1 Boettcher A. L. Wyllie P. J. , 1968 . Melting of granite with excess water to 30 kilobars pressure , J. Geol. , 76 , 235 – 244 . Google Scholar Crossref Search ADS WorldCat 2 Boone G. M. , 1969 . Origin of clouded red feldspars: petrologic contrasts in a granite porphyry intrusion , Amer. J. Sci. , 267 , 633 – 668 . Google Scholar Crossref Search ADS WorldCat 3 Creer K. M. Ispir Y. , 1970 . An interpretation of the behavior of the geomagnetic field during polarity transitions , Phys. Earth Planet, Int. , 2 , 282 – 293 . 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M. , 1970 . On remagnetization problems in palaeomagnetism: further considerations , Earth Planet, Sci. Letters , 9 , 407 – 415 . Google Scholar Crossref Search ADS WorldCat 26 Watkins N. D. , 1969 . Non-dipole behaviour during an Upper Miocene geomagnetic polarity transition in Oregon , Geophys. J. R. astr. Soc. , 17 , 121 – 149 . Google Scholar Crossref Search ADS WorldCat This content is only available as a PDF.
TI - Some Curious Magnetic Results From a Precambrian Granite
JF - Geophysical Journal International
DO - 10.1111/j.1365-246X.1972.tb06126.x
DA - 1972-06-01
UR - https://www.deepdyve.com/lp/oxford-university-press/some-curious-magnetic-results-from-a-precambrian-granite-wRUOvLnYap
SP - 237
EP - 248
VL - 28
IS - 3
DP - DeepDyve
ER -