全文获取类型
收费全文 | 7617篇 |
免费 | 2007篇 |
国内免费 | 1333篇 |
专业分类
测绘学 | 76篇 |
大气科学 | 101篇 |
地球物理 | 3505篇 |
地质学 | 5363篇 |
海洋学 | 377篇 |
天文学 | 29篇 |
综合类 | 647篇 |
自然地理 | 859篇 |
出版年
2024年 | 20篇 |
2023年 | 75篇 |
2022年 | 202篇 |
2021年 | 283篇 |
2020年 | 223篇 |
2019年 | 374篇 |
2018年 | 300篇 |
2017年 | 315篇 |
2016年 | 357篇 |
2015年 | 358篇 |
2014年 | 441篇 |
2013年 | 478篇 |
2012年 | 415篇 |
2011年 | 419篇 |
2010年 | 404篇 |
2009年 | 583篇 |
2008年 | 570篇 |
2007年 | 510篇 |
2006年 | 535篇 |
2005年 | 436篇 |
2004年 | 473篇 |
2003年 | 377篇 |
2002年 | 318篇 |
2001年 | 325篇 |
2000年 | 335篇 |
1999年 | 227篇 |
1998年 | 236篇 |
1997年 | 213篇 |
1996年 | 201篇 |
1995年 | 188篇 |
1994年 | 184篇 |
1993年 | 144篇 |
1992年 | 121篇 |
1991年 | 69篇 |
1990年 | 54篇 |
1989年 | 55篇 |
1988年 | 45篇 |
1987年 | 32篇 |
1986年 | 11篇 |
1985年 | 12篇 |
1984年 | 4篇 |
1983年 | 1篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1979年 | 21篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1954年 | 8篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
993.
994.
995.
996.
997.
郯庐断裂山东段(胶东)中生代中酸性火山岩的锆石U-Pb年代学及地球化学特征 总被引:3,自引:0,他引:3
对胶东青山群中酸性火山岩进行了LA-ICP-MS锆石U-Pb同位素年代学研究。结果表明,3个粗面岩-粗面英安岩和1个流纹岩的年龄分别为119.4±0.9 Ma、118.2±1.0 Ma、120.2±0.9 Ma和120.0±0.8 Ma,都形成于早白垩世120~118 Ma之间。研究表明郯庐断裂带山东段及其两侧中生代青山群火山岩的年龄与苏皖段断裂带内火山岩的年龄相似,明显小于苏皖段断裂带附近火山岩盆地的火山岩年龄。其结果表明在中国东部岩石圈减薄的大背景下,受郯庐断裂控制的岩浆喷发事件持续的时间可能更长。胶东青山群中酸性火山岩表现出富钾、富碱、贫镁、贫钛和低Ni、Cr的地球化学特征,轻稀土元素富集,重稀土元素亏损。按地球化学组成可进一步分为粗面岩-粗面英安岩和流纹岩两类,前者富集大离子亲石元素Rb、Ba、K,亏损高场强元素Nb、Ta、Ti和P;而后者则强烈亏损Ba、Sr等大离子亲石元素和Ti、P等高场强元素。粗面岩-粗面英安岩相对流纹岩具有高的Sr和Ba含量以及La/Nb、Ba/Nb比值,而具有低的Rb/Ba比值和Eu负异常,说明它们来源于不同的岩浆源区。推测粗面岩-粗面英安岩可能是下地壳(俯冲扬子下地壳或者古老华北下地壳)部分熔融和富集地幔部分熔融混合的产物;流纹岩是由于区域拉张环境和高热异常背景下,下地壳发生深熔产生的岩浆喷出地表形成的,岩浆在上升过程中发生有分离结晶(大量斜长石的分离结晶)过程。 相似文献
998.
999.
With the analysis of the sources and formation mechanism of the clay minerals in the sediment core from the Dalianhai lake in the Gonghe Basin,northeastern Tibet-Qinghai Plateau,clay mineral composition proxies,grain-size and carbonate contents have been employed for high-resolution study in order to reconstruct East Asian Summer Monsoon (EASM) over the northeastern Tibet-Qinghai Plateau during the lastdeglacial.The study also extended to establish a relationship between vegetation cover changes and erosion during the last 14.5 ka with pollen record and clay mineral proxies.Smectite/kaolinite and smectite/(illite+chlorite) ratios allow us to assess hydrolysis conditions in lowlands and/or physical erosion process in highlands of the Gonghe Basin.Before 12.9 Cal ka BP,both mineralogical ratios show low values indicative of strong physical erosion in the basin with a dominant cold and dry phase.After 12.9 Cal ka BP,an increase in both mineralogical ratios indicates enhanced chemical weathering in the basin associated with a warm and humid climate.The beginning of Holocene is characterized by high smectite/(illite+chlorite) and smectite/kaolinite ratios that is synchronous as with deposition of many peat laminae,implying the best warm and humid conditions specifically between 8.0 to 5.5 Cal ka BP.The time interval after 5.0 Cai ka BP is characterized by a return to high physical erosion and low chemical weathering with dry climate conditions in the basin.Comparing variations of clay mineral assemblages with previous pollen results,we observe a rapid response in terms of chemical weathering and physical erosion intensity to a modification of the vegetation cover in the basin. 相似文献
1000.
On the basis of field observations, microscopic thin-sections and laboratory data analysis of ten faults in Xuanhan County area, northeastern Sichuan Basin, central China, the internal and megascopic structures and tectonite development characteristics are mainly controlled by the geomechanical quality in brittle formation of the Changxing-Feixianguan Formation. The fluid transportation performance difference between the faults formed by different geomechanics or different structural parts of the same fault are controlled by the mcgascopic structure and tectonite development characteristics. For instance, the extension fault structure consists of a tectonite breccia zone and an extension fracture zone. Good fluid transportation performance zones are the extension fracture zone adjacent to the tectonite breccia zone and the breccia zone formed at the early evolutionary stage. The typical compression fault structure consists of a boulder-clay zone or zones of grinding gravel rock, compression foliation, tectonite lens, and dense fracture development. The dense fracture development zone is the best fluid transporting area at a certain scale of the compression fault, and then the lens, grinding gravel rock zone and compression foliation zones are the worst areas for hydrocarbon migration. The typical tensor-shear fault with a certain scale can be divided into boulder-clay or grinding gravel rock zones of the fault, as well as a pinnate fractures zone and a derivative fractures zone. The grinding gravel rock zone is the worst one for fluid transportation. Because of the fracture mesh connectivity and better penetration ability, the pinnate fractures zone provides the dominant pathway for hydrocarbon vertical migration along the tensor-shear fault. 相似文献