排序方式: 共有11条查询结果,搜索用时 15 毫秒
1.
陆相咸化湖泊沉积硫酸盐岩硫同位素组成及其地质意义 总被引:5,自引:0,他引:5
现代海洋中的硫酸盐矿物和海水硫酸盐本身常有相似的硫同位素组成,因而可根据现代蒸发岩的硫酸盐同位素来判断古环境。据李任伟[1]引用Holser和Kaplan及格里年科的资料报道,海相蒸发岩及其所反映的古海洋硫酸盐的硫同位素组成只在较狭窄的范围内变化,现... 相似文献
2.
为研究塔里木盆地巴楚隆起古生代地层水的成因,进行了地层水化学、硼、锶、硫、氢和氧同位素分析,和粘土矿物X光衍射分析。分析结果显示,这些石炭系和奥陶系地层水相对于蒸发海水,富集Ca、B、Li和Sr而贫SO4,而部分奥陶系水样相对富K,表明受到了水-岩反应的改造δD与δ18O关系表明,所有测试数据均倾向全球大气降水线,两者的交点接近目前的当地降水,表明现代淡水已经与地层水混合。87Sr/86Sr值介于0.7090~0.7111之间,远高于沉积时期的海水。δ11B值为+19.7‰~+32.3‰,并显示随埋深增大、B浓度增高而降低。这些结果表明,同位素组成不同… 相似文献
3.
4.
5.
Macro-and Micro-Properties of Two Natural Marine Clays in China 总被引:2,自引:0,他引:2
In this paper,macro- and micro- properties of natural marine clay in two different and representative regions of China are investigated in detail.In addition to in-situ tests,soil samples are collected by use of Shelby tubes for laboratory examination in Shanghai and Zhuhai respectively,two coastal cities in China.In the laboratory tests,macro-properties such as consolidation characteristics and undrained shear strength are measured.Moreover,X-ray diffraction test,scanning electron microscope test,and mercury intrusion test are carried out for the investigation of their micro-properties including clay minerals and microstructure.The study shows that:(1) both clays are Holocene series formations,classified as either normal or underconsolidated soils.The initial gradient of the stress-strain curves shows their increase with increasing consolidation pressure;however,the Shanghai and the Zhuhai clays are both structural soils with the latter shown to be more structured than the former.As a result,the Zhuhai clay shows strain softening behavior at low confining pressures,but strain hardening at high pressures.In contrast,the Shanghai clay mainly manifests strain-hardening.(2) An activity ranges from 0.75 to 1.30 for the Shanghai marine clay and from 0.5 to 0.85 for the Zhuhai marine clay.The main clay mineral is illite in the Shanghai clay and kaolinite in the Zhuhai clay.The Zhuhai clay is mainly characterized by a flocculated structure,while the typical Shanghai clay shows a dispersed structure.The porous structure of the Shanghai clay is characterized mainly by large and medium-sized pores,while the Zhuhai clay porous structure is mainly featreed by small and medium-sized pores.The differences in their macro- and micro- properties can he attributed to different sedimentation environments. 相似文献
6.
7.
青藏高原咸化湖泊沉积碳酸盐岩碳、氧稳定同位素组成及其地质意义 总被引:1,自引:0,他引:1
青藏高原咸化湖泊沉积碳酸盐岩的碳、氧稳定同位素分析数据表明,咸化湖泊沉积碳酸盐岩富集13C和18O,在很大程度上同海洋沉积碳酸盐岩的13C、18O同位素区间值重叠,也具有较高的Z值。所以,在运用13C、18O稳定同位素值或Keith和Weber的区分侏罗纪以来的海洋、淡水沉积碳酸盐岩的Z值时,应考虑陆相咸化湖泊沉积碳酸盐岩的特点,以便正确地确定沉积环境 相似文献
8.
为研究塔里木盆地巴楚隆起古生代地层水的成因,进行了地层水化学、硼、锶、硫、氢和氧同位素分析,和粘土矿物X-衍射分析。分析结果显示,这些石炭系和奥陶系地层水相对于蒸发海水,富集Ca、B、Li和Sr而贫SO4,而部分奥陶系水样相对富K,表明受到了水-岩反应的改造。δD与δ18O关系表明,所有测试数据均倾向全球大气降水线,两者的交点接近目前的当地降水,表明现代淡水已经与地层水混合。87Sr/86Sr比值介于0.7090~0.7111之间,远高于沉积时期的海水。δ11B值为 19.7‰~ 32.3‰,并显示随埋深增大、B浓度增高而降低。这些结果表明,同位素组成… 相似文献
9.
柴达木冷科1井不同沉积环境元素地球化学特征 总被引:1,自引:0,他引:1
冷科1井 3000~4418m泥岩的元素分析数据表明:不同沉积环境中形成的泥岩,其元素的含量明显不同。微量元素 Mn、Rb、Ni、U、V、B、Co、Th和 Ga在湖相泥岩中含量明显增高,而在辫状三角洲及河流泛滥平原泥岩中含量较低。常量元素 Ca、K和 Mg在不整合面附近及泛滥平原泥岩中含量较高,湖相泥岩中含量低且变化小,其中 Ca、Mg表现的尤为明显。沼泽相泥岩中所有元素含量均最低。冷科 1井该段的元素地球化学分析结果说明元素地球化学方法可作为层序界面识别的一种依据。 相似文献
10.
青藏高原碱化湖泊沉积碳酸盐岩碳,氧稳定同位素组成及其地质意义 总被引:1,自引:0,他引:1
青藏高原咸化湖泊沉积碳酸盐岩的碳、氧稳定同位素分析数据表明,咸化湖泊沉积
碳酸盐岩富集13C和18O,在很大程度上同海洋沉积碳酸盐岩的13C、18O同位素区间值重叠,也具
有较高的Z值。所以,在运用13C、18O稳定同位素值或Keith和Weber的区分侏罗纪以来的海洋、
淡水沉积碳酸盐岩的Z值时,应考虑陆相咸化湖泊沉积碳酸盐岩的特点,以便正确地确定沉积环
境。 相似文献