全文获取类型
收费全文 | 1420篇 |
免费 | 272篇 |
国内免费 | 1171篇 |
专业分类
测绘学 | 47篇 |
大气科学 | 2篇 |
地球物理 | 94篇 |
地质学 | 2389篇 |
海洋学 | 179篇 |
综合类 | 103篇 |
自然地理 | 49篇 |
出版年
2024年 | 16篇 |
2023年 | 76篇 |
2022年 | 83篇 |
2021年 | 87篇 |
2020年 | 54篇 |
2019年 | 71篇 |
2018年 | 45篇 |
2017年 | 42篇 |
2016年 | 44篇 |
2015年 | 58篇 |
2014年 | 116篇 |
2013年 | 116篇 |
2012年 | 173篇 |
2011年 | 180篇 |
2010年 | 167篇 |
2009年 | 127篇 |
2008年 | 152篇 |
2007年 | 105篇 |
2006年 | 99篇 |
2005年 | 98篇 |
2004年 | 128篇 |
2003年 | 95篇 |
2002年 | 50篇 |
2001年 | 33篇 |
2000年 | 25篇 |
1999年 | 30篇 |
1998年 | 39篇 |
1997年 | 52篇 |
1996年 | 62篇 |
1995年 | 66篇 |
1994年 | 60篇 |
1993年 | 63篇 |
1992年 | 77篇 |
1991年 | 41篇 |
1990年 | 22篇 |
1989年 | 48篇 |
1988年 | 3篇 |
1985年 | 5篇 |
1984年 | 7篇 |
1983年 | 3篇 |
1979年 | 3篇 |
1972年 | 2篇 |
1950年 | 2篇 |
1949年 | 3篇 |
1948年 | 3篇 |
1946年 | 3篇 |
1945年 | 2篇 |
1944年 | 3篇 |
1942年 | 4篇 |
1941年 | 4篇 |
排序方式: 共有2863条查询结果,搜索用时 78 毫秒
41.
The Baimazhai nickel deposit, Yunnan Province, China, is located in the southern part of the Sanjiang (Tri-river) alkali-rich intrusive rock belt (Sanjiang ARIR). In this paper was conducted ^40Ar-^39Ar dating of two phlogopites in lamprophyres which are, as dikes, widely distributed in the orefield, and two plateau ages were acquired, i.e., 32.46±0.62 Ma and 32.01±0.60 Ma, respectively (averaging 32.23±0.60 Ma). The ages are obviously younger than those of the ore-hosted complex and mineralization of the Baimazhai nickel deposit. In combination with the characteristics, it is indicated that lamprophyres in the orefield and those in the Sanjiang ARIR are similar in tectonic setting, mineral assemblage and geochemistry. It is considered that lamprophyres in the orefield are the important component of the Sanjiang ARIR, and the lamprophyres and ore-hosted complex in the orefield represent the products of two times of different magmatic activity from different mantle sources. On the other hand, the age of lamprophyres in the orefield is older than that of the strike-slip shearing of the Ailaoshan-Honghe fault belt, suggesting that the strike-slip shearing of the Ailaoshan-Honghe fault belt is not the factor leading to magmatic activity of lamprophyres in the orefield, while it is more possible that magmatic activity of the Sanjiang ARIR promoted strike-slip shearing of the fault belt. 相似文献
42.
Formation Dynamics and Quantitative Prediction of Hydrocarbons of the Superpressure System in the Dongying Sag 总被引:1,自引:0,他引:1
Based on the theory of formation dynamics of oil/gas pools, the Dongying sag can be divided into three dynamic systems regarding the accumulation of oil and gas: the superpressure closed system, the semi-closed system and the normal pressure open system. Based on the analysis of genesis of superpressure in the superpressure closed system and the rule of hydrocarbon expulsion, it is found that hydrocarbon generation is related to superpressure, which is the main driving factor of hydrocarbon migration. Micro fractures formed by superpressure are the main channels for hydrocarbon migration. There are three dynamic patterns for hydrocarbon expulsion: free water drainage, hydrocarbon accumulation and drainage through micro fissures. In the superpressure closed system, the oil-driving-water process and oil/gas accumulation were completed in lithologic traps by way of such two dynamic patterns as episodic evolution of superpressure systems and episodic pressure release of faults. The oil-bearing capacity of lithologic traps is intimately related to reservoir-forming dynamic force. Quantitative evaluation of dynamic conditions for pool formation can effectively predict the oil-bearing capability of traps. 相似文献
43.
Subtle traps or oil pools have become an important exploration play in the Dongying Depression, Bohai Bay Basin, east China. Despite recent successes in exploration, the formation mechanisms of subtle traps are still not well understood. The majority of subtle oil pools in the Dongying Depression are developed in the middle interval of the Es3 Member of the Paleogene Shahejie Formation with the subtle traps being primarily of lenticular basin-floor turbidite sands encompassed in mudstones. Oil in the subtle traps was previously thought to have migrated directly from the surrounding source rocks of the same formation (Es3). Detailed geochemical investigation of 41 oils and 41 rock samples from the depression now indicates that the oils from the subtle traps cannot be correlated well with the surrounding Es3 source rocks, which are characterized by high Pr/ Ph (〉1), low Gammacerane/C30hopane, representing a freshwater lacustrine setting. In contrast the oils features low Pr/Ph (〈1) and relatively high Gammacerane content, showing a genetic affinity with the underlying Es4 source rocks, which also have the same qualities, indicating a brackish lacustrine setting. Oils in the Es3 subtle traps are probably derived from mixed sources with the contribution from the upper Es4 source rocks predominating. Therefore unconventional oil migration and accumulation mechanisms need to be invoked to explain the pooling of oils from the ES4 source rocks, which probably came through a thick low interval of the Es3 source rocks with no apparent structural or stratigraphic pathways. We suggest that the subtle oil migration pathway probably plays an important role here. This finding may have significant implications for future exploration and the remaining resource evaluation in the Dongying Depression. 相似文献
44.
流变学:构造地质学和地球动力学的支柱学科 总被引:12,自引:6,他引:6
地球是一动态系统,其各层圈的构造运动归根到底就是多矿物复合岩石在各种物理条件(例如,温度、围压、差应力、应变速率、应变方式等)下和化学环境(例如,氧逸度和水含量)中的形变。流变学作为研究岩石力学性质和变形行为的科学,现已成为地球动力学和构造地质学的支柱学科。本文对国际上近年来岩石流变学的最新进展做些扼要的介绍,呼吁中国固体地学界加强流变学的研究,做出经得起时间淘洗、实践检验的原创性成果来,使中国的构造地质学研究迈进国际先进的行列。 相似文献
45.
46.
47.
49.
程裕淇院士是我国著名的变质岩石学家、矿床学家和前寒武纪地质学家。中国科学院学部委员(院士),中国人民政治协商会议第四届、第五届全国委员会委员,第六届、第七届全国政协常务委员会委员。程裕淇先生开拓了我国变质岩研究领域,提出了矿床成矿系列理论,发展了我国前寒武纪地质学。他在管理上积极推进地质行业的对外开放,促进国际合作交流,为建立中央直属的野战军队伍建言献策;在政协多次提案,推动了我国矿产资源法的立法和实施。 相似文献
50.
石头是人类由蒙昧走向智慧的启蒙,彩石和矿物颜料开启了人类对美的认识和追求。人类在使用矿物岩石中相继出现的武器、农耕时代、陶器、金属冶炼、人类聚落和城邦,标志着人类智慧的爆发和文明根基的建立。遍布全球的规模性采掘和矿业活动为早期人类社会的发展奠定了工业和经济基础,给人类认识矿物岩石和探索地球的奥秘打开了大门。东西方先哲们最早观察和思索天地万物、物质组成和变化、探索石头和金属的形成,炼丹术和炼金术、早期博物学、早期医学对金属、矿物和岩石的进一步探索与实践,孕育了现代矿物学和地质学。中世纪矿业的繁荣带动了地质科学研究的复兴,矿床学和矿物学的确立、化石研究与地层层序的确立、岩石成因的水火之争、山脉成因的垂向升降和水平挤压之争导致了地质学的诞生和确立。 相似文献