全文获取类型
收费全文 | 6068篇 |
免费 | 1363篇 |
国内免费 | 2655篇 |
专业分类
测绘学 | 52篇 |
大气科学 | 217篇 |
地球物理 | 1036篇 |
地质学 | 7716篇 |
海洋学 | 204篇 |
天文学 | 114篇 |
综合类 | 252篇 |
自然地理 | 495篇 |
出版年
2024年 | 46篇 |
2023年 | 111篇 |
2022年 | 230篇 |
2021年 | 231篇 |
2020年 | 270篇 |
2019年 | 336篇 |
2018年 | 291篇 |
2017年 | 329篇 |
2016年 | 347篇 |
2015年 | 376篇 |
2014年 | 428篇 |
2013年 | 387篇 |
2012年 | 460篇 |
2011年 | 395篇 |
2010年 | 339篇 |
2009年 | 442篇 |
2008年 | 353篇 |
2007年 | 428篇 |
2006年 | 427篇 |
2005年 | 379篇 |
2004年 | 357篇 |
2003年 | 335篇 |
2002年 | 279篇 |
2001年 | 290篇 |
2000年 | 327篇 |
1999年 | 313篇 |
1998年 | 288篇 |
1997年 | 233篇 |
1996年 | 183篇 |
1995年 | 159篇 |
1994年 | 171篇 |
1993年 | 144篇 |
1992年 | 112篇 |
1991年 | 70篇 |
1990年 | 61篇 |
1989年 | 35篇 |
1988年 | 40篇 |
1987年 | 27篇 |
1986年 | 16篇 |
1985年 | 11篇 |
1984年 | 7篇 |
1983年 | 10篇 |
1980年 | 1篇 |
1979年 | 5篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1954年 | 4篇 |
排序方式: 共有10000条查询结果,搜索用时 62 毫秒
41.
Fault Characteristics in Longmen Mountain Thrust Belt,Western Sichuan Foreland Basin,China 总被引:1,自引:0,他引:1
Through field geological survey,the authors found that abundant thrust faults developed in the Longmen (龙门) Mountain thrust belt.These faults can be divided into thrust faults and strike-slip faults according to their formation mechanisms and characteristics.Furthermore,these faults can be graded into primary fault,secondary fault,third-level fault,and fourth-level fault according to their scale and role in the tectonic evolution of Longmen Mountain thrust belt.Each thrust fault is composed of several secondary faults,such as Qingchuan (青川)-Maowen (茂汶) fault zone is composed of Qiaozhuang (乔庄) fault,Qingxi (青溪) fault,Maowen fault,Ganyanggou (赶羊沟) fault,etc..The Longmen Mountain thrust belt experienced early Indosinian movement,Anxian (安县) movement,Yanshan (燕山)movement,and Himalayan movement,and the faults formed gradually from north to south. 相似文献
42.
Geochronological studies on the crust-derived Tianmenshan pluton were undertaken by SHRIMP zircon U-Pb dating and Ar-Ar dating of biotite, muscovite and K-feldspar, giving a petrogenetic age of 167 Ma. Owing to the closure systems in different minerals, the cooling history of the pluton can be determined with an age-temperature diagram. The late hydrothermal event has been recognized, which is related probably with mineralization. In terms of the comparative geochronological and petrologic records, it is concluded that there are some constrains on tectonic evolution and that the formation of the Tianmenshan pluton proceeded in a transition period from Indosinian post-orogeny extension to strong compressive tectonics. And the timing of the hydrothermal event matches the compressive climax of the Yanshanian orogeny. The temporal gap between granite emplacement and wolframite mineralization could last 10-20 Ma owing to the low cooling rate of the pluton. 相似文献
43.
The characteristics and sources of natural gases from Ordovician weathered crust reservoirs in the Central Gas Field in the Ordos Basin 总被引:2,自引:2,他引:0
Xianqing Li Guoyi Hu Jian Li Dujie Hou Peng Dong Zhihong Song Yunfeng Yang 《中国地球化学学报》2008,27(2):109-120
The Central Gas Field is a famous large-sized gas field in the Ordos Basin of China. However, identification of main gas sources of the Ordovician reservoirs in this gas field remains puzzling. On the basis of a lot of geochemical data and geological research on natural gases, the characteristics and sources of natural gases from Ordovician weathered crust reservoirs in the Central Gas Field in the Ordos Basin were studied. The results indicated that natural gases from Ordovician weathered crust reservoirs in the Central Gas Field in the Ordos Basin have similar chemical and isotopic compositions to highly mature and over-mature dry gases. Both coal-derived gases and oil-type gases coexist in the Central Gas Field in the Ordos Basin. The former was derived mainly from Carboniferous-Permian coal measures and the latter from Lower Paleozoic marine carbonates. It is suggested that coal-derived gases occur in the eastern part of the Central Gas Field while oil-type gases may be produced mainly in the northern, western and southern parts of the Central Gas Field in the Ordos Basin. 相似文献
44.
Two elongatoolithid dinosaur eggs from the Upper Cretaceous of Ganzhou, Jiangxi Province and the embryonic skeletons they bear are described. They represent the first oviraptorosaurian eggs with embryonic skeletons in China and provide the first example that an oospecies can be correlated to certain dinosaur taxon/taxa. The two eggs are the same as the pair of the eggs inside a female oviraptorosaurian pelvis from the same horizon of the same area in both macro- and micro-structures of the egg shells, and can he referred to the oospecies, Macroolithus yaotunensis Zhao, 1975. The morphology of the preserved part of the embryonic skeletons indicates that they may have been laid by an oviraptorid, Heyuannia huangi from Guangdong Province or a closely related oviraptorosaurian, which may have been lived in the Ganzhou area too in the Late Cretaceous. The embryonic skeletons of the two eggs are not in the same developing stage. In one of the eggs, the postzygapophysis of the preserved vertebrae are well ossified, indicating that it was just hatched. 相似文献
45.
Central Fujian Rift is another new and important volcanogenic massive sulfide Pb-Zn polymetallic metallogenetic belt. In order to find out the material genesis and mineralization period of Meixian-type Pb-Zn-Ag deposits, S and Pb isotope analysis and isotope geochronology of ores and wall rocks for five major deposits are discussed. It is concluded that the composition of sulfur isotope from sulfide ore vary slightly in different deposits and the mean value is close to zero with the 834S ranging from -3.5‰ to +5.6‰ averaging at +2.0‰, which indicates that the sulfur might originate from magma or possibly erupted directly from volcano or was leached from ore-hosted volcanic rock. The lead from ores in most deposits displays radioactive genesis character (206pb/204pb〉18.140, 207Pb/204pb〉15.584, 208pb/204pb〉38.569) and lead isotope values of ores are higher than those of wall rocks, which indicates that the lead was likely leached from the ore-hosted volcanic rocks. Based on isotope data, two significant Pb-Zn metallogenesis are delineated, which are Mid- and Late-Proterozoic sedimentary exhalative metailogenesis (The single zircon U-Pb, Sm-Nd isochronal and Ar-Ar dating ages of ore- hosted wall rocks are calculated to be among 933-1788 Ma.) and Yanshanian magmatic hydrothermal superimposed and alternated metallogenesis (intrusive SHRIMP zircon U-Pb and Rb-Sr isochronal ages between 127-154 Ma). 相似文献
46.
江西省永平铜矿西部排土场极限堆载高度确定 总被引:2,自引:0,他引:2
国内外对排土场极限堆载高度的理论计算缺乏研究,目前尚无成熟的统一理论计算方法。文章结合永平铜矿西部排土场的工程实例,在进行边坡工程地质条件勘察与排土场岩土物理力学性质试验研究的基础上,采用数值计算方法对排土场进行了分层堆载数值模拟计算。通过对计算结果的分析,得到位移、塑性区与安全系数随堆载高度的变化规律,并确定了该排土场的极限堆载高度。 相似文献
47.
48.
This paper describes the spatial and functional evolution of a central place system as market conditions change with population growth. Utilizing a partial equilibrium optimization model, we examine the spatial response of two economic sectors to increases in market populations resulting from natural increase and migration. Response in both sectors is conditioned by threshold demand, with factor prices also affecting one of the sectors. As the central place system evolves it exhibits spatial and functional characteristics that are initially consistent with a Löschian landscape, then a Christallerian landscape at higher populations, while at even larger populations Krugman’s landscape emerges. 相似文献
49.
50.
大别山是中国东部中朝大陆板块与扬子大陆板块之间的碰撞造山带。具有薄皮构造的性质。组成两个碰撞大陆之间的滑脱(冲断剪切)带的岩石就是碰撞混杂岩组合。大别山由于剥露较深,仰冲壳楔完全被剥蚀,超高压变质带大面积出露,识别出碰撞混杂岩组合是对大别山进行几何分析的必要步骤。大别山碰撞混杂岩组合可分为南北两部分。北部为条带状片麻岩-超镁铁岩组合,南部为云母斜长片麻岩-榴辉岩组合,这两个组合的大部分都经历过超高压变质作用。它们的共同特点是具有宏观的"碎斑结构"和混杂作用。罗田穹隆是造山过程中早期形成的双冲式背斜,最后在造山晚期因东西向缩短的叠加而形成穹隆。 相似文献