论文部分内容阅读
广泛分布于兰州市黄河北岸朱家井、大沙沟一线东西两侧的桔红色石英砂岩体(即所谓“安宁系”或“安宁段”)的成因是一个长期未解决的问题,水成或风成历来各家争论极多,莫衷一事。研究过这一砂岩体成因的外国学者首推苏联的B·H·帕甫林诺夫,他认为这一砂岩体“……应属上新世的风成砂岩沉积类型”。但国内的一些研究者并不都同意这一权威性的意见。1980年春,英国地貌学家德比西尔(E·Derbyshire)来兰讲学时,见到该砂岩体的一个剖面:下部是产状水平或近于水平的甘肃
The genesis of the orange-red quartz sandstone bodies (the so-called “tranquility” or “tranquility”) widely distributed on the east and west sides of the Zhujiajing and Dashaogou first line of the Yellow River in Lanzhou City is a long-standing unsolved problem. Historically, there has been a great deal of controversy between different parties. Foreign scholars who have studied the origin of this sandstone body devaluated BHP Pavlinov, the Soviet Union, who believed that this sandstone body “... should belong to the Pliocene aeolian sandstone sedimentary type.” However, some domestic researchers do not agree with this authoritative opinion. In the spring of 1980, when English geomorphologist Derbyshire made his lectures, he saw a profile of the sandstone body: the lower part was Gansu at the genotype level or near the level