| 青海湖晚更新世沉积物中胶黄铁矿的发现及其环境指示意义 |
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| 引用本文： | 艾莉,强小科,宋友桂,敖红,安芷生.青海湖晚更新世沉积物中胶黄铁矿的发现及其环境指示意义[J].地球物理学报,2011,54(9):2309-2316. |
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| 作者姓名： | 艾莉 强小科 宋友桂 敖红 安芷生 |
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| 作者单位： | 1. 黄土与第四纪地质国家重点实验室,中国科学院地球环境研究所,西安 710075;
2. 中国科学院研究生院,北京 100049 |
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| 基金项目： | 国家自然科学基金项目(40599420)资助. |
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| 摘 要： | 对青海湖南盆沉积中心钻取的一根长18.6 m的高取芯率沉积岩芯(1F)进行磁化率测试显示,该岩芯在8.15～8.96 m和15.50～17.28m两沉积段具有非常高的磁化率.详细的岩石磁学测量和矿物分析表明这两段沉积物中有大量的胶黄铁矿存在,其磁畴特征主要以单畴(SD)为主,并显示少量超顺磁(SP)颗粒特征,这是导致磁...
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| 关 键 词： | 青海湖 湖泊沉积物 胶黄铁矿 岩石磁学 环境磁学 |
| 收稿时间： | 2010-10-12 |
Identification of greigite in the late Pleistocene sediments of Lake Qinghai and its environmental implications |
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| AI Li,QIANG Xiao-Ke,SONG You-Gui,AO Hong,AN Zhi-Sheng.Identification of greigite in the late Pleistocene sediments of Lake Qinghai and its environmental implications[J].Chinese Journal of Geophysics,2011,54(9):2309-2316. |
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| Authors: | AI Li QIANG Xiao-Ke SONG You-Gui AO Hong AN Zhi-Sheng |
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| Institution: | 1. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China;
2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | Lake Qinghai, the largest lake in China, is situated in an important climate-sensitive zone on the northeastern margin of Tibetan Plateau. In this study, the magnetic mineralogy of a late Pleistocene sediment core (1F, 18.6 m long) from the southern sub-basin deposition center of Lake Qinghai was studied using multiple rock-magnetic and non-magnetic measurements. There are two distinct magnetic susceptibility peaks at the depths of 8.15~8.96 m and 15.50~17.28 m. High- and low-temperature magnetic measurements, coupled with scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) analyses, suggest that the sediments from these two intervals contain a large number of single domain (SD) and some superparamagnetic (SP) greigite particles, which is the primary cause for the enhancement of magnetic susceptibility. Greigite particles are mainly formed due to sulfate reduction, an early stage of diagenesis. Therefore, the occurrence of greigite in 1F core implies that the Lake Qinghai could have experienced two intervals favorable for early diagenesis during the late Pleistocene. |
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| Keywords: | Lake Qinghai Lake sediment Greigite Rock magnetism Environmental magnetism |
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