| 泥河湾盆地马圈沟剖面早更新世矿物变化特征及其古环境意义 |
| |
| 引用本文： | 孙爱军,高东林,张岩,任倩慧,刘秀婷,袁小龙.泥河湾盆地马圈沟剖面早更新世矿物变化特征及其古环境意义[J].盐湖研究,2020,28(1):18-24. |
| |
| 作者姓名： | 孙爱军 高东林 张岩 任倩慧 刘秀婷 袁小龙 |
| |
| 作者单位： | 中国科学院青海盐湖研究所,中国科学院盐湖资源综合高效利用重点实验室,青海西宁 810008;青海省盐湖地质与环境重点实验室,青海西宁 810008;中国科学院大学,北京 100049,中国科学院青海盐湖研究所,中国科学院盐湖资源综合高效利用重点实验室,青海西宁 810008;青海省盐湖地质与环境重点实验室,青海西宁 810008,青海省有色地质矿产勘查局八队,青海西宁 810012,中国科学院青海盐湖研究所,中国科学院盐湖资源综合高效利用重点实验室,青海西宁 810008;青海省盐湖地质与环境重点实验室,青海西宁 810008;中国科学院大学,北京 100049,中国科学院青海盐湖研究所,中国科学院盐湖资源综合高效利用重点实验室,青海西宁 810008;青海省盐湖地质与环境重点实验室,青海西宁 810008;中国科学院大学,北京 100049,中国科学院青海盐湖研究所,中国科学院盐湖资源综合高效利用重点实验室,青海西宁 810008;青海省盐湖地质与环境重点实验室,青海西宁 810008 |
| |
| 基金项目： | 中国科学院青海盐湖研究所135培育项目(Y560031008) |
| |
| 摘 要： | 在野外考察采样的基础上,对泥河湾盆地马圈沟剖面更新世河湖相沉积序列进行了XRD矿物组分和磁性矿物分析。研究发现,剖面沉积矿物主要由碎屑矿物和碳酸盐矿物组成,碎屑矿物主要为石英、钠长石、白云母和斜绿泥石,其平均含量分别为38.77%、17.16%、29.63%和4.11%,是剖面沉积矿物组成主体,且各矿物之间基本没有相关性;相对于碎屑矿物,碳酸盐矿物在整个剖面中含量较低,主要为方解石和白云石,其平均含量分别为4.72%、3.59%,文石在剖面中零星出现。对剖面典型样品进行热磁分析,确定了沉积物中磁性矿物的种类以及加热过程中的变化和产物,并对其来源进行了探讨。同时发现,含绿泥石较高的灰绿色粉砂样品加热后磁化率的升幅比灰黄色样品高,而绿泥石的相对含量与该地区化学风化密切相关,进一步说明κ-T曲线的变化特征可以用来反应盆地化学风化作用强度的变化,具有重要的古环境意义。
|
| 关 键 词： | 泥河湾盆地 马圈沟剖面 碎屑矿物 碳酸盐矿物 热磁分析 |
| 收稿时间： | 2018/7/26 0:00:00 |
| 修稿时间： | 2018/9/5 0:00:00 |
Mineral Variation of Majuangou Profile in the Nihewan Basin During the Early Pleistocene and Its Paleoenvironmental Significance |
| |
| SUN Ai-jun,GAO Dong-lin,ZHANG Yan,REN Qian-hui,LIU Xiu-ting and YUAN Xiao-long.Mineral Variation of Majuangou Profile in the Nihewan Basin During the Early Pleistocene and Its Paleoenvironmental Significance[J].Journal of Salt Lake Research,2020,28(1):18-24. |
| |
| Authors: | SUN Ai-jun GAO Dong-lin ZHANG Yan REN Qian-hui LIU Xiu-ting and YUAN Xiao-long |
| |
| Institution: | Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,The Eighth Brigade of Qinghai Provincial Bureau of Nonferrous Metal and Geological Exploration,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences |
| |
| Abstract: | Abstract: Based on the field investigation and systemic samples collected at Majuangou profile, selected 67 samples by equal intervals of 1m to XRD mineral component analysis, establish characteristic of minerals and paleoenvironment relationship of Nihewan basin in the early Pleistocene. The results show that the sedimentary minerals were major component of detrital minerals and carbonate minerals. Detrital minerals were dominated the profile sedimentary mineral and composition with quartz,sodium feldspar, dolomite and plagioclase, the mean values of 38.78%, 17.16%, 29.63%, and 4.10%, respectively. Each of the detrital minerals were hardly have the correlation.The carbonate minerals have low content in the section and major component by the calcite and dolomite, with the content of 4.72% and 3.59%, respectively. It has a few of aragonite in the profile, the source of aragonite was from the mollusk shells. Coupled with thermomagnetic analysis, the grayish-green silt samples generally have higher contents of chlorite and more enhanced magnetic susceptibility after heating than the grayish-brown silts samples. In addition, the contents of chlorite were closely positive correlation with the chemical weathering in the study areas, supported that the variation characteristics of thermo-magnetic analysis (especially k-t curve) can be used to reflect the intensity variation of chemical weathering in the Nihewan Basin. It was important paleoenvironmental significance. |
| |
| Keywords: | Nihewan Basin Majuangou profile detrital minerals carbonate minerals Thermomagnetic analysis |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《盐湖研究》浏览原始摘要信息 |
| 点击此处可从《盐湖研究》下载免费的PDF全文 |
|
