第四百零三章 祁连山中

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    青海南山,因位于青海湖之南而得名,又叫库库诺尔岭。位于青海湖、布哈河、哈拉湖之南,沙珠玉盆地、德令哈盆地之北;东从倒淌河与拉脊山分界,西在阿让郭勒河源头与土尔根达坂山、党河南山过渡。青海南山长500公里,宽20-90公里。山峰海拔一般在4000-500。米,西北高、东南低。最高峰位于西部的哈尔科山,海拔5139米。整个山地以巴音郭勒河干流分为东西两段:东段位于青海湖南岸,东西长300公里,宽20-40公里,山脊脉络清楚,山峰海拔一般4000-4500米,最高峰为塔漫山,海拔4592米。西段由于水系切割较为破碎,又可分为南北两支,南支宗务隆山,北支哈尔科山。宗务隆山位于塔塔棱河、阿让郭勒河与巴戛柴达木湖盆地、德令哈盆地之间。长200公里,宽30-40公里,山峰海拔一般4000一4500米,最高峰位于德令哈西北,海拔5030米。哈尔科山位于阿让郭勒河与哈拉湖之间。山岭主体位于西北部,东部和南部由于水系切割,脉络不甚清楚。山峰海拔在5000米左右,最高峰位于西部,海拔5139米。
    拉脊山,曾称小积石山或唐述山。位于湟水和黄河干流之间,西起干子河口,东到QH省界。长260公里,宽20-40公里,山峰多在海拔4.000-4500米之间,最高峰野牛山海拔4832米。由于水系切割已形成很多山口。青沙山口、拉脊山口、日月山口均是出入西宁的重要交通要道。拉脊山总体走向北西西—南东东,东段近东西向,是拉脊山的主体,西段近北西—南东向叫日月山。日月山又叫纳喇萨喇。古称赤岭。位于日月山口与干子河口之间。长90公里,宽10-20公里。山峰海拔多在4000米左右,最高峰阿勒大湾山海拔4455米。日月山自古以来是QH省东西之间的交通要道,西宁至格尔木的公路、铁路由此通过。
    荣达木盆地北缘诸山,位于柴达木盆地北缘的赛什腾山、绿梁山、锡铁山、阿木尼克山、耗牛山总体上均呈北西西—南东东走向,山岭极为低缓,山脊多不连续,主要由古生代及其更老的岩系构成。它们与祁连山脉的主体为一系列小盆地分隔,在自然地理上已属柴达木盆地范围,在地质构造上属祁连山地槽褶皱系,所以把这些山岭合称柴达木盆地北缘诸山,从大的山系上仍可划归祁连山脉。赛什腾山位于苏干湖盆地与马海盆地之间,西起冷湖镇以东15公里,东至敖劳河谷。长90公里,宽一般20一30公里,山峰海拔多在3500-4000米之间。山坡上部陡峭,下部和缓,山脊连续性差,两端均已形成孤立山峰。最高峰位于东部,海拔4576米。绿梁山,位于柴达木盆地北部,依克柴达木之南,西起鱼卡河谷,东至塔塔棱河谷。长60公里,宽一般10公里。山峰海拔多在3500-4000米,山坡上部较陡,下部和缓,山脊不连续,多呈独立的块状山地。最高峰位于西段,海拔4111米。锡铁山位于柴达木盆地北部,巴戛柴达木湖之南。是典型的块状山,长宽均在15公里左右。山坡陡峻,山峰海拔4037米。山岭主要由古老变质岩构成,有多种金属矿藏。阿木尼克山位于北霍布逊湖盆地之北,北与布依坦乌拉山之间有宽约20公里的平坦宽谷分开;西起全集河谷,东到托索湖盆地西缘。长100公里,宽一般10-20公里。山峰海拔一般为3000-3500米,山坡和缓,山顶浑圆,山脊不甚连续。最高峰位于山岭中部偏西,海拔4166米。耗牛山位于柴达木盆地东北角,德令哈—希里沟盆地西南。长70公里,一般宽5-10公里。山峰海拔多在3500-4000米之间,山脊不甚连续。西段较低叫南山,东段较高是耗牛山的主体,最高峰位于东段,海拔4472米。耗牛山主要由早古生代地层组成,煤的蕴藏较丰富。
    祁连山为昆仑秦岭地槽褶皱系的一个典型加里东地槽,褶皱迥返于陆相泥盆系磨拉石建造之前。北祁连山及河西走廊见中、下泥盆统不整合于下古生界及加里东晚期花岗岩之上;拉脊山见中、下泥盆统不整合于中、上奥陶统之上;南祁连山乌兰大坂见上泥盆统不整合于下志留统之上,代表祁连山主要于加里东晚期褶皱成山,基本由地槽变为地台发展阶段,故晚古生代一中、新生代均为地台盖层沉积。
    祁连山的北界为塔里木一ALS地台,以大断裂分界。南界与东昆仑和西秦岭褶皱系间也为大断裂所切,两者沉积地层不同,如中吾农山一青海南山石炭、二叠系为冒地槽沉积,局部夹火山岩,而欧龙布鲁克隆起带寒武一奥陶纪时为地台型砂页岩碳酸盐建造,厚700-2000余米,假整合于上元古界全吉群之上。
    祁连山脉西段由:走廊南山、黑河谷地,托莱山,托莱河谷地,托莱南山、疏勒河谷地,疏勒南山、哈拉湖盆地,党河南山、喀克吐郭勒谷地,赛
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