【作者】 钱方； 徐树金； 殷伟德；

【Author】 Qian Fang Xu Shujin Yin Weide (Institute of Geomechanics,Chinese Academy of Geological Sciences)

【机构】 中国地质科学院地质力学研研所；

【摘要】 <正>甲洼盆地位于青藏高原东部边缘的川西高原夷平面上,理塘县城南。雅砻江支流理塘河经盆地通过。盆底海拔3620—3680m 左右,四周环绕4200—4600m 的高原面,高原面上分布着丘岗,散布着冰碛漂砾,远处为终年积雪的峰峦。甲洼盆地中堆积了一套厚度大干315m 的松散状河湖相沉积物,称为甲洼组。该组构成盆地中的一些小丘岗,丘岗相对高差一般50余米,最高可达150m 左右。同时也为理塘河更多还原

【Abstract】 To the south of Litang County of Sichuan Province,the Quaternary flu- violacustrine strata of 315m in thickness have been deposited in the Jiawa basin.They were named Jiawa Formation by the authors.A study of magnetic polarity stratigraphy for this Formation has been carried out.In comparing the magnetic Polarity with the magnetic polarity time scale,it has been de- termined that the time of the Jiawa Formation corresponds to late Matsuya- ma to early Brunhes.Estimation by means of sedimentation rate gives the of Jiawa Formation about 1.23—0.44Ma which is in keeping with what the other methods concluded.更多还原