干旱区生态环境知识资源中心(Arid): 鲁中山地北麓黄土-古土壤粘土矿物组成及古环境意义

Arid

	鲁中山地北麓黄土-古土壤粘土矿物组成及古环境意义
其他题名	CLAY MINERAL COMPOSITION OF LOESS DEPOSITS AND IT'S PALEOENVIRONMENTAL SIGNIFICANCE IN THE NORTHERN PIEDMONT OF THE CENTRAL SHANDONG MOUNTAINOUS REGION
	万琳琪; 朱丽东; 彭淑贞; 丁敏; 赵秋月; 张伟; 郝青振
来源期刊	第四纪研究
ISSN	1001-7410
出版年	2020
卷号	40 期号:6 页码:1522-1531
中文摘要	鲁中山地北麓的黄土沉积是我国东部平原区第四纪冰期-间冰期古环境变化的重要记录。目前,对这套沉积经历的风化成壤过程还没有开展系统的研究,限制了轨道尺度古环境变化信息的挖掘。本文采用X射线衍射分析方法,对鲁中山地北麓黑山剖面末次间冰期以来代表性的黄土L_1和古土壤S_1样品进行了粘土矿物测试分析。结果表明,黑山黄土沉积的粘土矿物组成以伊利石和蛭石(含层间羟基矿物,简称HIM)为主,二者含量在70.9% ~ 82.2%之间,而高岭石、绿泥石和蒙脱石含量相对较少;与冰期黄土L_1相比,间冰期古土壤S_1含有较高的蛭石(+HIM)和高岭石,而伊利石、绿泥石和蒙脱石的含量相对较低,并且伊利石结晶度KI值和绿泥石风化指数(0.47/0.71 nm)显著增高。粘土矿物组合以及伊利石和绿泥石的化学风化特征表明古土壤经历了中等风化成壤作用,指示了暖温带湿润-半湿润的气候环境,夏季风显著增强。末次冰期黄土L_1中含有较多碎屑成因的蛭石(+HIM),与已有黄土高原末次冰期黄土研究结果对比分析后,排除了鲁中山地北麓黄土与黄土高原黄土一样主要来自西北内陆荒漠区的可能,这进一步支持了鲁中山地北麓黄土主要来源于近源的华北平原各类沉积物的结论。
英文摘要	The loess deposits in the northern piedmont of the Central Shandong Mountains (CSM ) region are significant records of Quaternary paleoenvironmental changes in the eastern plains of China. At present, there is no systematic research on the weathering and soil formation process experienced by this set of sediments, which limits the interpretation of paleoenvironmental information. In this paper, the Heishan(36°10.05'N, 116°20.63'E) section,a typical eolian loess section in the northern piedmont of the CSM, was investigated. Annual temperature and precipitation are typically 14.4℃ and 631.0 mm in this region, respectively. The section has a thickness of 12.3 m, with yellow plough horizon(0~0.8 m), greyish black Holocene soil(S_0: 0.8~2.9 m),Malan loess(L_1: 2.9~7.5 m) and the last interglacial palaeosol( S_1: 7.5 ~ 12.3 m). The Optically Stimulated Luminescence(OSL) dating results indicate that the top and bottom ages of L_1 are 10.90.6 ka and 65.02.2 ka, respectively(Zhao et al.,2019,2020). Clay minerals were measured using the X-ray diffraction (XRD) on oriented mounts of clay-sized particles (< 2 m). In this section, 5 and 7 samples were selected from the glacial loess(L_1 ) and the last interglacial soils(S_1 ), respectively. All samples for clay minerals analysis were disaggregated in deionized water and treated with 10% H_2O_2 and 1 mol/L HAC to remove organic materials and carbonate, respectively. XRD Analysis was carried out using a PANalytical X'Pert PRO X-ray Diffractometer with CuKalpha radiation, operating at 40 kV, 40 mA. Identification of clay minerals was made mainly according to the position of the (001 ) series of basal reflections on the XRD diagrams(Moore and Reynolds, 1989). Illite crystallinity (Kubler index, KI) was obtained from the full width half maximum of the 1.0 nm peak(Delta°2theta). Lower values indicate higher crystallinity, characteristic of weak hydrolysis under dry and cold climate conditions in continental environments. Chlorite ratio, an index for charactering the weathering of chlorite, was calculated as the ratio of the areas of the 0.47 nm and 0.71 nm peak of chlorite at 0.47 nm. Results indicate that the clay mineral composition of the Heishan loess deposition is mainly composed of illite and vermiculite (including hydroxyl-interlayered mineral (+ HIM ) ) ranging from 70.9% to 82.2%. The contents of kaolinite, chlorite and smectite are relatively low. Compared with the glacial loess L_1, the interglacial paleosol Si contained higher levels of vermiculite (+HIM ) and kaolinite, while the contents of illite, chlorite and smectite are relatively low. Moreover, the illite crystallinity (KI) and chlorite ratio(0.47/0.71 nm), which reflect the chemical weathering intensity indicators of illite and chlorite, are significantly higher in the paleosol S_1 samples than in the loess L_1 samples. The clay mineral assemblages and the higher illite crystallinity (KI ) and chlorite ratio (0.47/0.71 nm) in the paleosol S_1 indicate a warm temperate humid to sub-humid climatic environment during the interglacial period. In the last glacial period, the loess L_1 from the CSM contains more detrital vermiculite(+ HIM) than those of loess L_1 from the Chinese Loess Plateau, which indicates the eolain deposits in the northern piedmont of the CSM are not derived from dust blown from the deserts in the northwest China. This further proves the conclusion that the loess in the northern piedmont of the CSM was mainly derived from various types of sediments in the North China Plain, as inferred by the geochemical and grain-size analysis(Peng et al., 2016).
中文关键词	粘土矿物 ; 黄土-古土壤 ; 鲁中山地 ; 风化成壤 ; 物源
英文关键词	clay minerals loess-paleosol the Central Shandong Mountains region weathering loess provenance
类型	Article
语种	中文
收录类别	CSCD
WOS类目	Geology
CSCD记录号	CSCD:6859149
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/353420
作者单位	万琳琪, 浙江师范大学地理与环境科学学院;;泰山学院旅游学院, ;;, 金华;;泰安, 浙江;;山东 321004;;271000, 中国. 朱丽东, 浙江师范大学地理与环境科学学院, 金华, 浙江 321004, 中国. 彭淑贞, 泰山学院旅游学院;;中国科学院地质与地球物理研究所, ;;中国科学院新生代地质与环境重点实验室, 泰安;;, 山东;;北京 271000;;100029, 中国. 张伟, 泰山学院旅游学院;;中国科学院地质与地球物理研究所, ;;中国科学院新生代地质与环境重点实验室, 泰安;;, 山东;;北京 271000;;100029, 中国. 丁敏, 泰山学院旅游学院, 泰安, 山东 271000, 中国. 赵秋月, 泰山学院旅游学院, 泰安, 山东 271000, 中国. 郝青振, 中国科学院地质与地球物理研究所;;中国科学院生物演化与环境卓越创新中心;;中国科学院大学地球与行星科学学院;;中国科学院地球科学研究院, 中国科学院新生代地质与环境重点实验室;;中国科学院生物演化与环境卓越创新中心;;;;, ;;;;;;, 北京;;北京;;北京;;北京 100029;;100044;;100049;;100029, 中国.
推荐引用方式 GB/T 7714	万琳琪,朱丽东,彭淑贞,等. 鲁中山地北麓黄土-古土壤粘土矿物组成及古环境意义[J],2020,40(6):1522-1531.
APA	万琳琪.,朱丽东.,彭淑贞.,丁敏.,赵秋月.,...&郝青振.(2020).鲁中山地北麓黄土-古土壤粘土矿物组成及古环境意义.第四纪研究,40(6),1522-1531.
MLA	万琳琪,et al."鲁中山地北麓黄土-古土壤粘土矿物组成及古环境意义".第四纪研究 40.6(2020):1522-1531.