本文選題：干旱區(qū)　切入點(diǎn)：博斯騰湖　出處：《干旱區(qū)地理》2017年03期

【摘要】：中國西北干旱區(qū)湖泊沉積物存在磁性礦物種類復(fù)雜和磁化率普遍偏低等問題,使得利用環(huán)境磁學(xué)手段重建古環(huán)境、古氣候的方法受到了限制。選擇新疆博斯騰湖BST12B鉆孔頂部巖芯(深度0~2.5 m)不同沉積相的代表性樣品,進(jìn)行載磁性礦物富集,并將原樣品和富集獲得的樣品分別做XRD(X熒光衍射)巖石礦物檢測。結(jié)果顯示,所有湖相樣品中均有黃鐵礦和磁鐵礦檢出,而沒有磁黃鐵礦和針鐵礦檢出,說明博斯騰湖全新世湖相沉積物的主要磁性礦物是磁鐵礦,并含有少量黃鐵礦;富集獲得的樣品中粘土礦物(如綠泥石等)含量明顯增加,石英、長石和方解石含量降低,富集后的殘留樣品的磁化率大幅度降低,說明粘土礦物對干旱區(qū)湖泊沉積物的磁學(xué)貢獻(xiàn)不容忽視。結(jié)合沉積物粒度、色度、硫元素含量以及沉積物磁性礦物的組合特征推斷,黃鐵礦可以作為湖泊高水位的指示礦物種類,因而具有重建湖泊古水位變化的潛力,并應(yīng)用到博斯騰湖的全新世湖泊環(huán)境重建,發(fā)現(xiàn)博斯騰湖BST12B鉆孔位置早全新世為接近氧化環(huán)境的淺湖相環(huán)境,而中晚全新世為深湖相沉積環(huán)境并存在一個(gè)淺水的湖濱相沉積環(huán)境。研究結(jié)果說明,利用載磁性礦物富集的方法對干旱區(qū)湖泊沉積物中所含磁性礦物進(jìn)行富集后檢測是開展干旱區(qū)湖泊環(huán)境磁學(xué)研究的可行手段,對研究湖泊環(huán)境變化具有重要意義。
[Abstract]:The sediments of lakes in arid area of Northwest China China problems of magnetic mineral species complex and magnetic susceptibility is generally low, making the reconstruction of ancient environment by means of environmental magnetism, ancient climate is limited. Xinjiang Bosten Lake BST12B (0~2.5 m top core drilling depth) with different sedimentary facies of representative samples were loaded magnetic minerals. And the original sample and the enrichment obtained samples were XRD (X fluorescence diffraction). The results showed that the detection of rock and mineral, pyrite and magnetite were detected in all samples in the lake, and no pyrrhotite and needle iron ore detected, indicating that the main magnetic minerals of Bosten Lake Holocene lacustrine deposits are magnetite, and contains a small amount of pyrite clay minerals; enrichment in the sample obtained (such as chlorite) content increased, quartz, feldspar and calcite content decreased, the residual magnetization of sample enrichment rate Decrease that magnetism of clay minerals in arid area of lake sediment contribution can not be ignored. Combined with the sediment granularity, chroma, sulfur content and sediment magnetic mineral assemblages that pyrite can be used as indicator minerals in lake level, thus has the reconstruction of lake level change of ancient potential, and applied to the Holocene Lake Environment reconstruction Bosten Lake, Bosten Lake found BST12B drilling position in early Holocene to oxidizing environment shallow lacustrine environment, while the middle and late Holocene sedimentary environment for the existence of a deep lake and shallow lake sedimentary environment. The study results show that using the method of loading magnetic minerals for enrichment of magnetic containing sediments in arid area after detection is carried out in Lake mineral feasible means of lakes in arid land of environmental magnetism, it is important to study on the changes in lake environment.

【作者單位】： 蘭州大學(xué)西部環(huán)境教育部重點(diǎn)實(shí)驗(yàn)室蘭州大學(xué)資源環(huán)境學(xué)院;
【基金】：國家自然基金重點(diǎn)項(xiàng)目(41130102) 中央高�；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金(lzujbky-2013-121)聯(lián)合資助
【分類號】：P512.2;P534.632

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