首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   100篇
  免费   7篇
  国内免费   15篇
大气科学   1篇
地球物理   38篇
地质学   49篇
海洋学   18篇
综合类   6篇
自然地理   10篇
  2015年   2篇
  2013年   1篇
  2011年   8篇
  2010年   1篇
  2009年   13篇
  2008年   2篇
  2007年   1篇
  2006年   3篇
  2005年   9篇
  2004年   18篇
  2003年   8篇
  2002年   4篇
  2001年   5篇
  2000年   1篇
  1999年   10篇
  1998年   1篇
  1997年   12篇
  1996年   2篇
  1995年   5篇
  1994年   1篇
  1993年   4篇
  1992年   2篇
  1991年   4篇
  1989年   2篇
  1988年   1篇
  1987年   1篇
  1976年   1篇
排序方式: 共有122条查询结果,搜索用时 62 毫秒
121.
Geochemical and isotopic investigations have been carded out on the Chebu gabbroite in southern Jiangxi Province, southeast China and these results are compared with gabbro bodies along the coast of Fujian Province in order to understand their magma sources and tectonic implications. The Chebu intrusion formed at the beginning of the Middle Jurassic (172~4.3 Ma). These rocks are Ti-rich and Al-poor in major elements, characterized by strong enrichment in large-ion lithophile elements (LILE) and moderate enrichment in high field strength elements (HFSE) and light rare-earth elements CLREE), without pronounced Nb or Ta anomalies. Age-correlated Sr-Nd isotope ratios show moderately high ranges of (^87Sr/^86Sr)i from 0.7065 to 0.7086 and 0.5124 to 0.5125 of (^143Nd/^144Nd)i. The geochemical characteristics of the Chebu gabbroite suggest that it is notably different from island-arc basalt and similar to intra-plate basaltic rocks. By combining interpretations of its geological and geochemical characteristics and the regional geological development history, the Chebu gabbroitic intrusion is thought to be the product of asthenosphere upwelling and rapid lithosphere extension during a transition of tectonic systems in southeast China. The tectonic environment and source characteristics of the intrusion are different from Cretaceous gabbro bodies along the coast of Fujian Province, The former formed in a tectonic environment of rapid intra-plate lithospheric extension and the source characteristics were of a weakly enriched primitive mantle, whereas the latter originated mainly in a volcanic-magmatic arc extensional tectonic environment and the nature of the source was an enriched mantle with more subduct subducted components.  相似文献   
122.
Experimental data,obtained from previous studies,on Critical Tractive Stress(CTS) of non-uniform sediments, have been used to verify the adequacy of existing relationships for CTS of non-uniform bimodal sediments.Keeping in view the performance of such relationships,a new relationship for computation of dimensionless CTS of individual size fraction of non-uniform unimodal and bimodal sediments has been proposed in the form of power law.The coefficient and exponent of the proposed power law have been empirically correlated with sediment characteristics for available sediment data.The proposed relationship has been validated with independent flume and field data to assess their applicability for unimodal and bimodal sediments.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号