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71.
Kurt O. Konhauser Vernon R. Phoenix Simon H. Bottrell David G. Adams & Ian M. Head 《Sedimentology》2001,48(2):415-433
Silicified deposits, such as sinters, occur in several modern geothermal environments, but the mechanisms of silicification (and crucially the role of microorganisms in their construction) are still largely unresolved. Detailed examination of siliceous sinter, in particular sections of microstromatolites growing at the Krisuvik hot spring, Iceland, reveals that biomineralization contributes a major component to the overall structure, with approximately half the sinter thickness attributed to silicified microorganisms. Almost all microorganisms observed under the scanning electron microscope (SEM) are mineralized, with epicellular silica ranging in thickness from < 5 μm coatings on individual cells, to regions where entire colonies are cemented together in an amorphous silica matrix tens of micrometres thick. Within the overall profile, there appears to be two very distinct types of laminae that alternate repeatedly throughout the microstromatolite: ‘microbial’ layers are predominantly consisting of filamentous, intact, vertically aligned, biomineralized cyanobacteria, identified as Calothrix and Fischerella sp.; and weakly laminated silica layers which appear to be devoid of any microbial component. The microbial layers commonly have a sharply defined base, overlying the weakly laminated silica, and a gradational upper surface merging into the weakly laminated silica. These cyclic laminations are probably explained by variations in microbial activity. Active growth during spring/summer allows the microorganisms to keep pace with silicification, with the cell surfaces facilitating silicification, while during their natural slow growth phase in the dark autumn/winter months silicification exceeds the bacteria’s ability to compensate (i.e. grow upwards). At this stage, the microbial colony is probably not essential to microstromatolite formation, with silicification presumably occurring abiogenically. When conditions once again become favourable for growth, recolonization of the solid silica surface by free‐living bacteria occurs: cell motility is not responsible for the laminations. We have also observed that microbial populations within the microstromatolite, some several mm in depth, appear viable, i.e. they still have their pigmentation, the trichomes are not collapsed, cell walls are unbroken, cytoplasm is still present and they proved culturable. This suggests that the bulk of silicification occurred rapidly, probably while the cells were still alive. Surprisingly, however, measurements of light transmittance through sections of the microstromatolite revealed that photosynthetically active light (PAL) only transmitted through the uppermost 2 mm. Therefore the ‘deeper’ microbial populations must have either: (i) altered their metabolic pathways; (ii) become metabolically inactive; or (iii) the deeper populations may be dominated by different microbial assemblages from that of the surface. From these collective observations, it now seems unequivocal that microstromatolite formation is intimately linked to microbial activity and that the sinter fabric results from a combination of biomineralization, cell growth and recolonization. Furthermore, the similarities in morphology and microbial component to some Precambrian stromatolites, preserved in primary chert, suggests that we may be witnessing contemporaneous biomineralization processes and growth patterns analogous to those of the early Earth. 相似文献
72.
本文首次弄清了毛垭温泉测点的局部地质环境,确定了测泉的水文地质性质和类型,弥补了建点基础资料之不足。采用常规的调查追踪方法对该前兆观测点近期出现的特大异常进行了较为详细地落实,并简要分析了调查结果。 相似文献
73.
74.
贵州早二叠世海相碳酸盐岩稳定同位素组成与玄武岩浆喷发热事件的关系 总被引:1,自引:0,他引:1
本文详细讨论了贵州织金地区早二叠世第一旋回海底喷发玄武岩浆对海相碳酸盐岩的碳、氧、锶同位素组成的影响,这主要表现为玄武岩浆喷发热事件导致了碳酸盐岩的δ~(1(?))C、δ~(18)O及~(87)Sr/~(86)Sr值的明显下降。 相似文献
75.
76.
黄骅坳陷在勘探石油过程中发现了丰富的地下热水。根据实际资料对黄烨坳陷大港探区的地热资源进行了初步评价,提出了黄骅场陷储热系统和热异常区的分布规律,通过水化学分析,指出坳陷补给条件差,可实行人工回灌,增加地下热水资源。 相似文献
77.
Land surface temperature is a key parameter in monitoring the status of crop water stress by remote sensing, and studying the water and energy balance in cropland ecosystem. The component temperatures of crop and soil are especially significant in remote … 相似文献
78.
79.
The purpose of this work was to study jointly the volcanic-hydrothermal system of the high-risk volcano La Soufrière, in
the southern part of Basse-Terre, and the geothermal area of Bouillante, on its western coast, to derive an all-embracing
and coherent conceptual geochemical model that provides the necessary basis for adequate volcanic surveillance and further
geothermal exploration. The active andesitic dome of La Soufrière has erupted eight times since 1660, most recently in 1976–1977.
All these historic eruptions have been phreatic. High-salinity, Na–Cl geothermal liquids circulate in the Bouillante geothermal
reservoir, at temperatures close to 250 °C. These Na–Cl solutions rise toward the surface, undergo boiling and mixing with
groundwater and/or seawater, and feed most Na–Cl thermal springs in the central Bouillante area. The Na–Cl thermal springs
are surrounded by Na–HCO3 thermal springs and by the Na–Cl thermal spring of Anse à la Barque (a groundwater slightly mixed with seawater), which are
all heated through conductive transfer. The two main fumarolic fields of La Soufrière area discharge vapors formed through
boiling of hydrothermal aqueous solutions at temperatures of 190–215 °C below the "Ty" fault area and close to 260 °C below
the dome summit. The boiling liquid producing the vapors of the Ty fault area has δD and δ18O values relatively similar to those of the Na–Cl liquids of the Bouillante geothermal reservoir, whereas the liquid originating
the vapors of the summit fumaroles is strongly enriched in 18O, due to input of magmatic fluids from below. This process is also responsible for the paucity of CH4 in the fumaroles. The thermal features around La Soufrière dome include: (a) Ca–SO4 springs, produced through absorption of hydrothermal vapors in shallow groundwaters; (b) conductively heated, Ca–Na–HCO3 springs; and (c) two Ca–Na–Cl springs produced through mixing of shallow Ca–SO4 waters and deep Na–Cl hydrothermal liquids. The geographical distribution of the different thermal features of La Soufrière
area indicates the presence of: (a) a central zone dominated by the ascent of steam, which either discharges at the surface
in the fumarolic fields or is absorbed in shallow groundwaters; and (b) an outer zone, where the shallow groundwaters are
heated through conduction or addition of Na–Cl liquids coming from hydrothermal aquifer(s).
Received: 9 November 1998 / Accepted: 15 July 1999 相似文献
80.
东秦岭(河南段)二郎坪群铜多金属成矿环境及成矿效应 总被引:6,自引:0,他引:6
二郎坪群位于北秦岭造山带中,在二郎坪群这套火山—沉积岩系中,含有在河南省占有重要地位的铜多金属矿。文章通过对二郎坪群的沉积建造特征、变基性火山岩的形成环境和岩浆来源特征的研究,认为二郎坪群形成于弧后盆地环境,其盆地规模和岩浆来源在盆地东西方向上存在差异,而铜多金属矿床成矿作用与二郎坪群的形成环境和变基性火山岩岩浆来源有着紧密的内在联系。二郎坪群弧后盆地在海底喷流作用下形成了不同成矿元素组合的铜-锌型和铅-锌型两种矿床类型。 相似文献