能登半島産安山岩の物理的性質と古地磁気学

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Thermal conductivity, elastic wave velocities, and density of andesites are measured at the room temperature and pressure condition. Samples are colected from the Miocene andesitic rocks at the Noto Peninsula and many of them are identified petrographically as augite-hypersthene andesite. Thermal conductivity is measured by devidedbar or steady state method. Error of our apparatus for individual measurement is assured less than 5%. Average of 26 samples is 4.13±0.76 (s.d.)×10^<-3> cal/cm. sec. deg.. Elastic wave velocites are determined by ultra-sonic-pulse method. 1 Mc TiBaO_3 exciter and reciever are used. Error is estimated less than 3% for langitudinal wave and 5% for transvers wave. Average velocities are 5.47±0.34(s.d.) km/sec and 3.30±0.18(s.d.) km/sec for longitudinal and transverese wave, respectively. Average density and porosity are 2.62±0.06(s.d.) gr/cm^3. and 2.03±1.20(s.d.)%, respectively. Relation between thermal conductivity and elastic wave velocity is discussed based upon solid-state physics. As a result, phonon conductivity of present samples has an approximately linear relation with velocity as K_<pn>=1.13×10^<-8>×W, where W=3^<1/3>(1/V_p^3+2/V_s^3)^<-1/3>. Palaeomagnetism at the Noto Peninsula is also studied for the same samples as measured physical properties. Natural remanent magnetization is measured by astatic magnetometer and stability is tested by AC-demagnetization method. Conclusions are as follows ; Anamizu formation (about 2.5×10^7 years ago) was formed under geomagnetic reversal field: Yanaida formation (about 2.0×10^7 years ago) and Kurosaki andesites (about 1.0×10^7 years ago) were formed under geomagnetic normal field.
地学団体研究会の論文
1969-11-25

能登半島産安山岩の物理的性質と古地磁気学

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