期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
沧水铺火山岩锆石SHRIMP U-Pb年龄及“南华系”底界新证据 被引量:91
1
作者 王剑 李献华 +4 位作者 T.Z.Duan 刘敦一 宋彪 李忠雄 高永华 《科学通报》 EI CAS CSCD 北大核心 2003年第16期1726-1731,共6页
湖南益阳地区沧水铺组陆相火山岩-火山碎屑沉积砾岩为一套高角度不整合于中元古界冷家溪群复理石浊积岩之上的楔状地层.取自该组地层下部火山岩段底部的英安质火山集块岩样品(N3)的高精度离子探针(SHRIMP)锆石U-Pb同位素年龄为814±... 湖南益阳地区沧水铺组陆相火山岩-火山碎屑沉积砾岩为一套高角度不整合于中元古界冷家溪群复理石浊积岩之上的楔状地层.取自该组地层下部火山岩段底部的英安质火山集块岩样品(N3)的高精度离子探针(SHRIMP)锆石U-Pb同位素年龄为814±12 Ma,这一年龄数据与已有的沧水铺组火山岩年龄数据(921~933 Ma)差距较大,它代表了该地区新元古界新的底界年龄.此项研究结果改变了沧水铺火山岩的时代归属,并支持以下观点:(1)研究区缺失了新元古代早期(814~1000 Ma之间)的沉积地层;(2)华南裂谷系始于约820 Ma左右;(3)820 Ma可能是中国新元古界“南华系”的底界年龄. 展开更多
关键词 沧水铺 火山岩 锆石SHRIMP U-PB年龄 新元古界 华南 “南华系”
原文传递
Red Soil Resource Information System and Its Preliminary Application 被引量:4
2
作者 WANGRENCHAO SHIZHOU 《Pedosphere》 SCIE CAS CSCD 1998年第1期9-14,共6页
Red soil is a very important soil resource in southern China. However, due to being simultaneously of high productive potentialities and severely degraded, it needs harnessing urgently. Red Soil Resource Information S... Red soil is a very important soil resource in southern China. However, due to being simultaneously of high productive potentialities and severely degraded, it needs harnessing urgently. Red Soil Resource Information System (RSRIS) based on remote sensing and geographic information system (GIS) plays an important role in survey, evaluation, utilization and management of red soil resource. RSRIS of Quzhou City) Zhejiang Province (1:250000) and RSRIS of Longyou County, Zhejiang Province (1:50000) have been made respectively on SUN SPARC station and using ARC/INFO. This paper introduces the system design,database creation and system functions, and it particularly focuses on developing applied models, such as red soil resource division and mapping, suitability evaluation, erosion risk evaluation, plant utilization zone etc. The problems on study of RSRIS and its developing strategy are also discussed. 展开更多
关键词 applied model geographic information system red soil resource
下载PDF
Two new species of the genus Cobitis Linnaeus(Teleostei:Cobitidae) from southern China
3
作者 陈咏霞 隋晓云 +1 位作者 梁娜 陈毅峰 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2016年第3期517-525,共9页
Two new species of the genus Cobitis from southern China,C.hereromacula from the Luohe River in Guangdong Province and C.baishagensis from the Nandujiang River in Hainan Province,are described and illustrated here.C.h... Two new species of the genus Cobitis from southern China,C.hereromacula from the Luohe River in Guangdong Province and C.baishagensis from the Nandujiang River in Hainan Province,are described and illustrated here.C.hereromacula can be distinguished from its congeners by possessing the following combination of characteristics;absence of the second and third pigmentary zones of Gambetta;13–16 oval blotches on the dorsum and 10–13 vertical,elongated triangular blotches below the midlateral line with more than 20 vertical dark brown bars between them;6–7 narrow rows of dark spots on the caudal fin;a vertical oval spot smaller than the eye diameter on the upper part of the caudal peduncle;pointed mental lobes of the lower lip pointed with a slightly filiform tip;one slender and long needle-shaped lamina circularis at the base of the first branched ray of the male pectoral fins.C.baishagensis can be distinguished from its congeners by the fourth Gambetta zone being covered by 10–12 transverse elongated blotches;4–5 narrow rows of dark spots on the caudal fin;a vertical blotch smaller than the eye diameter on the upper part of the caudal peduncle;males with a slender and long needle-shaped lamina circularis at the second branched pectoral fin ray in males;large scales with a slightly large focal zone;undeveloped mental lobes with a lower lip that does not end posteriorly in a filiform tip. 展开更多
关键词 spined loach taxonomy Guangdong HAINAN
下载PDF
Progress on shelf and slope circulation in the northern South China Sea 被引量:13
4
作者 Yeqiang SHU Qiang WANG Tingting ZU 《Science China Earth Sciences》 SCIE EI CAS CSCD 2018年第5期560-571,共12页
Influenced by the seasonally reversed monsoons, water exchange through straits, and topography, the shelf and slope circulation in the northern South China Sea(NSCS) is complex and changeable. The typical current syst... Influenced by the seasonally reversed monsoons, water exchange through straits, and topography, the shelf and slope circulation in the northern South China Sea(NSCS) is complex and changeable. The typical current system in the NSCS consists of the slope current, South China Sea warm current(SCSWC), coastal current, and associated upwelling(in summer) and downwelling(in winter). This paper reviews recent advances in the study of NSCS shelf and slope circulation since the 1990 s,and summarizes the roles of Kuroshio intrusion, the monsoons, topography, and the buoyancy effect of the Pearl River plume in the shelf and slope current system of the NSCS. We also point out some potential scientific issues that require further study, such as the dynamic connection between the internal basin and shelf areas of the NSCS, the persistence of the SCSWC in winter, the temporo-spatial characteristics of downwelling during winter in the NSCS, and its material and energy transport. 展开更多
关键词 The northern South China Sea Circulation Progress
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部