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《Geochimica》 1982-01
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PALEOMAGNETIC STUDIES ON A LOESS SECTION IN WESTERN GANSU

Wang Junda Li Huamei  
The Longxi loess section is quite different from that at eastern Liupanshan Mountains in stratigraphic structure, but with be tter magnetic stability than that of Luochuan loess. 43 samples were collected from the 95 m-thick Longxi loess section. Results of paleomagnetic measurement indicates that those samples taken from 0 down to 48 m in the section are normally magnetized. So there is no doubt that this part of Longxi loess was accumulated during the Brunhes epoch corresponding to the Middle Pleistocene Lishi Loess (Q2) and the Late Pleistocene Malan Loess (Q3). On the other hand, samples between 48-82 m within the section are mainly of reversed polarity, formed during the Matuyama reversed polarity epoch, corresponding to the Early Pleistocene Wucheng Loess (Q1). Jaramillo normal event was recorded at between 64--69m within this section. The starting point of loess accumulation is estimated to be about 1.15 my according to the boundary ages of polarity epochs and event and an accumulation rate of 8cm per thousand years was obtained.
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