SELF-REVERSAL OF THERMOREMANENT MAGNETIZATION IN PYROCLASTICS FROM THE 1991 ERUPTION OF MT-PINATUBO, PHILIPPINES

被引：20

作者：

OZIMA, M

FUNAKI, M

HAMADA, N

ARAMAKI, S

FUJII, T

机构：

[1] NATL INST POLAR RES,ITABASHI KU,TOKYO 173,JAPAN

[2] METEOROL RES INST,TSUKUBA,IBARAKI 305,JAPAN

[3] UNIV TOKYO,EARTHQUAKE RES INST,BUNKYO KU,TOKYO 113,JAPAN

[4] HOKKAIDO UNIV,FAC SCI,KITA KU,SAPPORO,HOKKAIDO 060,JAPAN

来源：

JOURNAL OF GEOMAGNETISM AND GEOELECTRICITY | 1992年 / 44卷 / 10期

关键词：

D O I：

10.5636/jgg.44.979

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We studied magnetic properties of the pyroclastics of the 1991 eruption of Mt. Pinatubo. At one locality of the pyroclastic flows, the directions of natural remanent magnetizations (NRMs) of dacite pumice fragments are dispersed, indicating that these fragments settled after their temperature reached their Curie points. At another locality, almost all dacite pumice fragments show reversed NRMs, indicating that these settled before their temperature reached the Curie point thereby acquiring a self-reversed thermo-remanent magnetization in the ambient geomagnetic field. Almost all the dacite pumice samples from both localities acquied self-reversed TRMs in the laboratory. Detailed examination revealed that these dacite pumice samples in the pyroclastic flows of the 1991 eruption of Mt. Pinatubo have characteristics of the Haruna-type self-reversal of thermo-remanent magnetization.

引用

页码：979 / 984

页数：6