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971.
Chen Yilin Qin Yong Li Jiuqing Li Zhuangfu Yang Tianyu Lian Ergang 《中国科学:地球科学(英文版)》2022,65(9):1736-1750
Science China Earth Sciences - The synthesis of carbon onions in the laboratory by various methods is common; however, naturally occurring carbon onions have only been found in a few geological... 相似文献
972.
Geochemistry of ore-forming fluids and geological significance 总被引:1,自引:0,他引:1
Ping?ShenEmail author Yuanchao?Shen Tiebing?Liu Guangming?Li Qingdong?Zeng 《中国科学D辑(英文版)》2005,48(11):1921-1931
The Kuoerzhenkuola gold field (including the Kuoerzhenkuola and the Buerkesidai gold deposits) is the most important one in
the Sawuer gold belt, northern Xinjiang, China. Isotopic studies including D, O, He, C, S, Pb and Sr reveal that the ore-forming
fluids of the Kuoerzhenkuola and the Buerkesidai deposits shared the same source: the water of ore fluids was magmatic water
and minor meteoric water; the mineralizers and ore materials derived mainly from mantle beneath the island arc, and partially
from crust. The ore-forming fluids of two deposits are a mixture of mantle-derived fluids incorporated by crust-derived fluid,
and meteoric water. Based on these results, combined with the consideration of the tectonic setting and geological features,
we suggest that the two gold deposits in the Kuoerzhenkuola gold field, Sawur gold belt share the same genesis, and are volcanogenic
hydrothermal gold deposits occurring in the same caldera. 相似文献
973.
Zengxue Li Qingbo Zeng Meng Xu Dongdong Wang Guangzeng Song Pingli Wang Xiaojing Li Xue Zheng 《海洋学报(英文版)》2021,40(2):95-106
In the present study, the coal-rock organic facies of Oligocene Yacheng Formation of the marginal basin in the South China Sea were classified and divided. In addition, through the correlations of the large-scale coal-bearing basins between the epicontinental sea and the South China Sea, it was concluded that the coal forming activities in the South China Sea presented particularity and complexity. Furthermore, the coal forming mechanisms also presented distinctiveness. The marginal basins in th... 相似文献
974.
利用南海北部的浮标、石油平台观测的海面风资料,分析了0~200 km范围内,不同离岸距离站点的风速的概率分布特征。观测结果指出,各站平均风速一般最大值出现在冬季,最小值出现在夏季,具有明显的季节变化特征,并且平均风速随着离岸距离的增大也逐渐增大。对于离岸距离较近的区域(100 km以内),海面风基本符合双参数的Weibull分布,但对于100 km以外的海面风速概率分布与Weibull分布存在明显差异,随着离岸距离的增大,平均风速和风速标准偏差也相应增大。风速平均值与风速标准偏差的比值较小时,Weibull分布的偏斜度基本为正值,当比值较大时偏斜度转为负值。随着离岸距离的增大,出现与Weibull分布不一致的情况越来越多,且与对应的Weibull分布相比,其偏斜度越小,风速概率分布越不能用Weibull分布进行较好拟合。 相似文献
975.
城乡一体化“现代地籍”建设关键问题研究 总被引:2,自引:0,他引:2
论文分析了现行地籍管理信息系统中存在的问题和发展趋势,对现代地籍的概念进行界定和阐述,进而研究探讨了城乡一体化“现代地籍”建设过程中的一些关键技术问题,并总结出可行的解决方案。 相似文献
976.
中新世以来滇西高原隆升的沉积学证据 总被引:5,自引:0,他引:5
印度与欧亚大陆的碰撞不仅造就了青藏高原,带动周围地区不同程度的隆起,而且通过隆升和剥蚀向高原内部盆地和环绕高原的周缘盆地提供了巨量的硅质碎屑,这些盆地的沉积记录了青藏高原隆升历史和隆升机制[1~4]。青藏高原周缘地区已成为窥视其隆升历史和机制的重要窗... 相似文献
977.
Baoju Yang Zhigang Zeng Haiyan Qi Xiaoyuan Wang Yao Ma Kunbo Rong 《Ocean Science Journal》2015,50(4):751-761
Fe-Si oxide deposits were recovered from the PACMANUS (Papua New Guinea-Australia-Canada-Manus) hydrothermal field in Eastern Manus basin. Samples were loose and fragile. Optical and scanning electron microscopy showed that the samples had abundant rod-like or twisted filamentous and granular structures. Electron probe microanalysis revealed that these filaments and grains were mainly composed of Fe and Si. The presence of spherical grains on the surface of the filaments suggests the intergrowth of biotic and abiotic reactions. Biotic and abiotic kinetics competition always exists in the redox gradient. Based on the physico-chemical conditions of PACMANUS hydrothermal fluids, we calculated a strict abiotic oxidation rate of Fe2+ to Fe3+, which is approximately 0.0123 g/min. If the fluids had been erupting consistently and the concentration of Fe2+ was constant, 3.232 kg per year of Fe would be deposited in this vent. The amount of Fe oxides around the studied vent was larger than the amount determined by strict abiotic kinetic calculation. Bacteria may also play an important role in Fe oxidation. A mesh-like microenvironment constructed by biogenic filaments ensured adequate Fe2+ and low oxygen content for the growth of bacteria. Moreover, this structure promoted the deposition of abiotic Fe-Si oxides. 相似文献
978.
本文运用Laplace变换法和围道积分法分析线性化的正压原始方程组的谱问题。通过严格的数学推演从形式上给出了方程组的初值问题的解,从而原则上决定了连续谱、离散谱的出现条件。与已有的研究结果相比较,本文最大的特点是保证了了解的完备性,因而相应的展开定理便是自然的了。 相似文献
979.
980.
Wu Jinglu Huang Chengmin Zeng Haiao Gerhard H. Schleser Rick Battarbee 《Journal of Paleolimnology》2007,38(1):13-23
Environmental change in Lake Taihu and its catchment since the early to middle part of the twentieth century has left a clear
geochemical record in the lake sediments. The human activities in the lake and its catchment responsible for the change include
agriculture, fishery, urbanisation, sewage and industrial waster disposal. Sediment cores were collected from Meilian Bay
of northern Lake Taihu to investigate the record of anthropogenic impacts on the lake’s ecosystem and to assess its natural,
pre-eutrophication baseline state. Two marked stratigraphic sediment units were identified on the basis of total phosphorus
concentration (TP), pigments, total organic carbon (TOC)/total nitrogen (TN), δ13C and δ15N corresponding to stages in the lake history dominated by phytoplankton, and by aquatic macrophytes. Results show that as
TP loading increased from the early 1950s the lake produced sediments with increasing amounts of organic matter derived from
phytoplankton. In the early 1950s, the first evidence for eutrophication at the Meilian Bay site is recorded by an increase
in C/N values and in sediment accumulation rate, but there is little change in phosphorus concentrations, pigments, δ13C and δ15N at this time. After 1990 a more rapid increase in trophic status took place indicated by increased levels of phosphorus,
pigments, δ15N and by decreased δ13C and TOC/TN values in the lake sediments. The first increase in trophic status of the early 1950s results mainly from agricultural
development in the catchment. In contrast, the acceleration from ca. 1990 originates from the recent development of fisheries
and the urbanisation and industrialisation of the catchment. 相似文献