第四百零四章 祁连山下

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通河、湟水,属外流水系;西北侧的石羊河、黑河、托来河、疏勒河、党河,属河西走廊内陆水系;哈尔腾河、鱼卡河、塔塔棱河、阿让郭勒河,属柴达木的内陆水系;还有青海湖、哈拉湖两独立的内陆水系。河流流量年际变化较小,而季节变化和日变化较大。祁连山脉东部的乌鞘岭、冷龙岭、日月山一线是中国西北地区内流区与外流区的分界线。此线以东的庄浪河、大通河、湟水皆汇入黄河,此线以西的河流皆为内流河。
    祁连山储水以冰川为主,冰川融水出流形成祁连山水系。根据中国科学院原冰川冻土研究所的统计,祁连山共有冰川3306条,面积达2060.0平方公里左右,约占我国冰川总面积56500.0平方公里的3.7%。现代冰川下限,北坡为4100.0~4300.0m,南坡4300.0~4500.m,且西部较东部高200.0~300.0m。冰川总储水量约为1145.0亿立方米QH省地理志记为1320亿立方米,大体相当于河西地区年径流量的15倍,冰雪融水主要补给山北的河西走廊和山南的大通河。冰川沿山脊成羽状分布其分布特征是:东经99°以东的走廊南山、冷龙岭,降水条件较好,冰川数量多、规模小,多数是悬冰川和冰斗冰川;东经99°以西地区冷储大,冰川数量少但规模大,多数是山谷冰川,有大雪山、斑赛尔山索珠连峰、疏勒南山、土尔根达板山和党河南山5个较大的冰川区。山系内最长的山脉一走廊南山冰川数目数最多,最高的山脉一疏勒南山冰川面积最大。
    最大的冰川是大雪山的老虎沟12号冰川和土尔根达坡的敦德冰川。老虎沟12号冰川属山谷冰川类型,长10.1公里,面积为21.9平方公里,冰储量达2.6立方公里,折水量约22.0亿立方米。敦德冰川跨甘肃、青海两省之间,为两省共有,属平顶冰川类型,面积57.1平方公里,长度6.2公里,冰储量4.3km3,折水量约36.0亿立方米冰川的平均厚度为50米,最大厚度在老虎沟12号冰川为120.0米。
    位于SNYGZ自治县西部陶赖山北坡、距JYG市约116公里的“七一”冰川,则属冰斗山谷冰川,全长30.5公里。该冰川的冰舌部海拔4302米,冰峰海拔5145米,冰川面积约5平方公里。冰层平均厚度为78米左右,最厚处达120米,年储水量约为1.6亿立方米,融水量70万-80万立方米,成为一个大固体淡水水库。“七一”冰川系我国科学院兰州分院的科学家和原苏联专家于1958年7月1日发现,并以登上冰川的日期命名的。它的被发现,标志着中国冰川研究的起步,所以有着特殊的地位。
    各时代地层大致分布及赋存有关矿产如下:中晚元古界分布于北祁连和中祁连等地,赋存有金、铜、铅锌、铁、钨、锰等矿产;寒武系分布于北祁连,赋存的矿产有铜铅锌、金、磷、钒、铀等矿产;奥陶系主要分布于北中南祁连,赋存的矿产有铜、铅锌、金;志留系分布于南北祁连,赋存的矿产有铜、金、铁、铅锌;泥盆系分布于北祁连,赋存的矿产有金、铅锌、汞;石炭系分布于北中南祁连,赋存的矿产有煤、金、铁、铅锌;二叠系在南北祁连,赋存矿产有金、铁、煤;三叠系主要分布于南北祁连,赋存矿产有金、汞、锑;侏罗系在祁连山有分布,赋存的矿产有煤、石油;白垩系在祁连山有较广泛分布,赋存的矿产有煤、石油;新生界在祁连山分布广泛,赋存的矿产有石膏、盐类、砂金矿等。
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