民勤盆地东北部晚第四纪深湖亚相地层空间分布及其环境意义

刘文浩; 张凡; 张复; 王永达; 范育新

doi:10.7522/j.issn.1000-694X.2014.00176

中国沙漠 >

2015 , Vol. 35 >Issue 1: 145 - 151

DOI: https://doi.org/10.7522/j.issn.1000-694X.2014.00176

古气候与环境演变

民勤盆地东北部晚第四纪深湖亚相地层空间分布及其环境意义

刘文浩 ,
张凡 ,
张复 ,
王永达 ,
范育新

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1. 兰州大学地质科学与矿产资源学院, 甘肃兰州 730000;
2. 兰州大学甘肃省西部矿产资源重点实验室, 甘肃兰州 730000;
3. 兰州大学西部环境教育部重点实验室, 甘肃兰州 730000

刘文浩(1989-),男,甘肃天水人,硕士研究生,研究方向为3S在干旱-半干旱区的应用.Email: liuwh12@lzu.edu.cn

收稿日期: 2014-09-18

修回日期: 2014-11-04

网络出版日期: 2015-01-20

基金资助

国家自然科学基金项目(41371033,41172163);新世纪优秀人才支持计划项目(NCET-12-0251);中央高校基本科研业务费项目(lzujbky-2013-k17)

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Spatial Distribution of the Late Quaternary Deep Lake Lacustrine Sediments in the Northeastern Minqin Basin, Gansu, China, and Its Environmental Significance

Liu Wenhao ,
Zhang Fan ,
Zhang Fu ,
Wang Yongda ,
Fan Yuxin

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1. School of Earth Sciences, Lanzhou University; Lanzhou 730000, China;
2. Key Laboratory of Mineral Resources in Western China of Gansu Province, Lanzhou University; Lanzhou 730000, China;
3. MOE Key Laboratory of Western China's Environmental Systems, Lanzhou University; Lanzhou 730000, China

Received date: 2014-09-18

Revised date: 2014-11-04

Online published: 2015-01-20

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摘要

民勤盆地位于石羊河下游,现今大面积地区已被风沙覆盖.前人的研究报道了在民勤盆地的东部曾经发育过一个面积巨大的"腾格里古大湖",然而尚不明确民勤盆地是否也曾被湖水覆盖.为此,本文收集整理了民勤盆地中8个水文地质钻孔的地层资料,利用GIS技术重现了研究区地表以下50 m深度内的湖相地层的空间分布特征.分析发现,在盆地的不同地区普遍发育了2~3层深湖亚相地层,部分地区甚至多达4层,各湖相层厚度介于0.5~32 m.区域地层对比结果显示,在某个时段研究区大范围地区普遍发育了深水湖泊,而其他时段则在不同地区零星发育了小湖泊.结合研究区已有的测年资料,本文认为在晚第四纪某个时段(倒数第二层深湖亚相发育阶段),整个研究区内曾经存在一个规模较大的连通湖泊;但民勤盆地晚第四纪不同阶段深湖亚相地层差异明显的空间分布特征,可能反映了湖盆沉积中心自东向西、再向北东的迁移过程.

关键词： 湖相地层; 腾格里古大湖; 晚第四纪; 民勤盆地; GIS

本文引用格式

刘文浩 , 张凡 , 张复 , 王永达 , 范育新 . 民勤盆地东北部晚第四纪深湖亚相地层空间分布及其环境意义[J]. 中国沙漠, 2015 , 35(1) : 145 -151 . DOI: 10.7522/j.issn.1000-694X.2014.00176

Abstract

Minqin Basin, a basin locating in the lower reaches of the Shiyang River, is now covered by sand desert in large area. A huge lake, Megalake Tengger, was evidenced existing to the east of Minqin Basin. However, it is still unclear whether the Minqin Basin was covered by the Megalake Tengger. Thereafter, the spatial distribution of deep lake lacustrine sediments was analyzed by using 50 m deep sedimentary sequence of 8 hydrogeological cores based on the GIS platform. 2-3 deep lake lacustrine units with thickness ranging between 0.5 m and 32 m were recovered from most area of the northeastern Minqin Basin, and up to 4 layers at some areas. The regional stratigraphic comparison supports that a deep lake once existed in the entire basin sometime and scattered lakes at the other time. Combing the dating results of previous researches, a unified huge lake covering the northeastern Minqin Basin was supported sometime during the Late Quaternary, corresponding to the penultimate deep lake lacustrine sedimentary unit (or the 1 315 m altitude shoreline). However, the big difference among spatial distribution of deep lake lacustrine sediments at different stages likely resulted from transition westward and subsequently northward of the sedimentary center during the Late Quaternary.

Key words： lacustrine sediments; Megalake Tengger; Late Quaternary; Minqin Basin; GIS

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