对辽河油田地层划分和对比工作的一点看法     

陈祥荣 《地球科学与环境学报》1997,(4)

辽河油田的地层划分基本上是传统的地层划分方法，所以存在一些问题。笔者采用多重地层划分方法，对牛心坨—曙北地区的代表性探井，作了岩石地层和年代地层的划分和对比，说明了多重地层划分的必要性。  相似文献   

陕西宁强二郎坝志留系的研究     

陈祥荣  成汉钧  汪明洲 《地球科学与环境学报》1988,(4)

剖面测自陕西省宁强县二郎坝乡景家沟,共鉴定各类化石约160个属种。依据岩性、岩相和化石特征,将该剖面划分为龙马溪组、崔家沟组、王家湾组和宁强组.并对王家湾组、宁强组的划分、对比及时代提出了新的意见。  相似文献   

Structural controls on fluid flow and related mineralization in the Xiangshan uranium deposit, Southern China   总被引：4，自引：0，他引：4  

Ge Lin  Ye Zhou  Xiangrong Wei  Chongbin Zhao 《Journal of Geochemical Exploration》2006,89(1-3):231

The Xiangshan uranium deposit of Southern China is a Mesozoic volcanic uranium deposit where mineralization is closely associated with regional rock deformation and fluid flow. To better understand the genesis of this deposit, we have carried out coupled deformation and fluid flow modeling to explore the relationship between mineralizing fluid flow and structural deformation processes. The numerical modeling results demonstrate that fluid transport and focusing are predominantly controlled by deposit scale structures and associated rock deformation.  相似文献   

Precipitation chemistry and corresponding transport patterns of influencing air masses at Huangshan Mountain in East China   总被引：1，自引：0，他引：1  

ChunE Shi  Xueliang Deng  Yuanjian Yang  Xiangrong Huang  Biwen Wu 《大气科学进展》2014,31(5):1157-1166

One hundred and ten samples of rainwater were collected for chemical analysis at the summit of Huangshan Mountain, a high-altitude site in East China, from July 2010 to June 2011. The volume-weighted-mean （VWM） pH for the whole sampling period was 5.03. SO2- and Ca2＋ were the most abundant anion and cation, respectively. The ionic concentrations varied monthly with the highest concentrations in winter/spring and the lowest in summer. Evident inter-correlations were found among most ions, indicating the common sources for some species and fully mixing characteristics of the alpine precipitation chemistry. The VWM ratio of [SO]-]/[NO3] was 2.54, suggesting the acidity of rainwater comes from both nitric and sulfuric acids. Compared with contemporary observations at other alpine continental sites in China, the precipitation at Huangshan Mountain was the least polluted, with the lowest ionic concentrations. Trajectories to Huangshan Mountain on rainy days could be classified into six groups. The rainwater with influencing air masses originating in Mongolia was the most polluted with limited effect. The emissions of Jiangxi, Anhui, Zhejiang and Jiangsu provinces had a strong influence on the overall rain chemistry at Huangshan Mountain. The rainwater with influencing air masses from Inner Mongolia was heavily polluted by anthropogenic pollutants.  相似文献   

数字经济时代提高中国水产品出口跨境电商竞争力研究          下载免费PDF全文

常健聪  樊向荣 《海洋开发与管理》2023,40(11):127-136

中国作为第一渔业大国，水产品出口贸易发展迅猛。但受国际政局动荡，贸易保护主义抬头，疫情后国际市场尚未完全恢复的影响，中国水产品出口贸易的发展受阻。而跨境电商在数字经济时代作为开展进出口贸易的一种新形式，对优化农渔业产业结构、促进农渔业经营增效、拓宽农渔民增收致富渠道等具有重要作用，但由于产业链不健全、专业水产品跨境电商平台建设存在短板、冷链物流频出问题及复合型人才欠缺等因素的制约，导致中国水产品优势尚未能通过叠加跨境电商释放倍增效应。基于此，文章以提取水产品出口跨境电商竞争力指标为基础构建竞争力模型，并通过SPSS和AMOS进行双因子实证分析，提出应从健全质量标准体系，提升跨境冷链物流服务水平等方面提高中国水产品出口跨境电商竞争力。  相似文献