全文获取类型
收费全文 | 63篇 |
免费 | 17篇 |
国内免费 | 27篇 |
专业分类
测绘学 | 12篇 |
地球物理 | 6篇 |
地质学 | 82篇 |
海洋学 | 2篇 |
综合类 | 3篇 |
自然地理 | 2篇 |
出版年
2024年 | 3篇 |
2023年 | 2篇 |
2022年 | 10篇 |
2021年 | 7篇 |
2020年 | 4篇 |
2019年 | 1篇 |
2018年 | 3篇 |
2016年 | 6篇 |
2015年 | 6篇 |
2014年 | 2篇 |
2013年 | 3篇 |
2011年 | 2篇 |
2010年 | 1篇 |
2008年 | 1篇 |
2007年 | 3篇 |
2006年 | 2篇 |
2004年 | 3篇 |
2003年 | 4篇 |
2002年 | 7篇 |
2001年 | 3篇 |
2000年 | 5篇 |
1998年 | 7篇 |
1997年 | 5篇 |
1996年 | 3篇 |
1995年 | 3篇 |
1994年 | 4篇 |
1993年 | 3篇 |
1992年 | 2篇 |
1991年 | 1篇 |
1990年 | 1篇 |
排序方式: 共有107条查询结果,搜索用时 15 毫秒
41.
粤西云开前寒武纪基底麻粒岩、紫苏花岗岩放射性元素分布特征与岩石成因讨论 总被引:3,自引:0,他引:3
粤西云开前寒武纪基底的麻粒岩、紫苏花岗闪长岩和紫苏闪长岩的放射性元素分布具有明显的规律,K/Rb比值分别为117~202,94~129,78~89,Th/U比值分别为15~30,11~20,25~78,U的含量范围分别为0.5×10-6~0.99×10-6,1.25×10-6~1.69×10-6,1.65×10-6~5.37×10-6.这种分布规律反映了在低XH2O、高CO2流体参与下麻粒岩的熔融、紫苏花岗质岩浆形成、难熔铁镁相和副矿物相富集的过程 相似文献
42.
Xianhua Li Zhengxiang Li Hanwen Zhou Ying Liu Xirong Liang Wuxian Li 《中国科学:地球科学(英文版)》2003,46(1):73-83
SHRIMP U-Pb zircon age, geochemical and Nd isotopic data are reported for the Neo-proterozoic Guandaoshan pluton in the Yanbian region, SW Sichuan. This pluton is of typical I-type granite and emplaced at (857 ± 13) Ma. Geochemical and Nd isotopic characters suggest that the pluton was generated by partial melting of pre-existing, young (late Mesoproterozoic to early Neo-proterozoic) low-K tholeiitic protolith within an intraplate anorogenic setting. The Guandaoshan pluton probably records the earliest magmatism induced by the proposed ca. 860–750 Ma mantle superplume beneath the supercontinent Rodinia.
相似文献44.
45.
Hanwen Dong Zhiqin Xu Yuan Li Zhao Liu Huaqi Li 《International Journal of Earth Sciences》2015,104(1):61-74
46.
位于雅砻江中游的楞古水电站工程地质条件十分复杂,大型-巨型滑坡发育。以雅砻江楞古水电站夏日滑坡为例,在现场详细调查的基础上,采用试验测试和数值模拟等方法,研究了蓄水后滑坡的稳定性发展趋势。根据地貌形态、物质组成、钻孔资料以及现场调查,将夏日滑坡划分为三个区,其中Ⅱ区目前已经出现一定的变形破坏,稳定性最差。数值模拟表明,蓄水前,夏日滑坡整体稳定性较好,只在前缘局部出现变形;蓄水后,滑坡变形明显扩大,前缘沿先存的次级滑带滑动。提出在夏日滑坡前缘进行格构锚和抗滑桩支护,并利用InSAR技术对滑坡灾害隐患进行早期识别和监测预警。该研究为楞古水电站库岸滑坡防治提供了重要依据,并对同类型滑坡研究具有一定的参考意义。 相似文献
47.
冻融循环作用下砂岩孔隙体积变形模型的建立与分析 总被引:2,自引:1,他引:1
为研究冻融作用下砂岩内部孔隙的扩展机制,基于弹性力学和热力学理论,建立了饱水孔隙内水结冰的体积变形计算模型。结合基于核磁共振技术的冻融循环作用下饱和砂岩的孔隙度变化和T2谱分布的试验结果,通过建立的孔隙体积变形计算模型,分析了冻融作用下砂岩的孔隙体积变形规律。结果表明:冻融作用下饱和砂岩的体积膨胀系数大于8.69%;单次冻融作用对砂岩试样的损伤较小,孔隙体积的变化范围在0.80%~1.03%之间;砂岩的孔隙收缩系数和孔隙弹性变形体积占比的变化规律一致,均为先增大后减小;砂岩试样的孔隙收缩系数在7.92%~8.04%之间,其孔隙弹性变形体积占比平均为97.79%;在冻融过程中大孔隙的弹性变形比小孔隙的弹性变形更小。 相似文献
48.
Crustal Structure of the Indus-Tsangpo Suture Zone and its Ophiolites,
Southern Tibet 总被引:1,自引:0,他引:1
XU Zhiqin DILEK Yildrim YANG Jingsui LIANG Fenghu LIU Fei BA Dengzhu CAIZhihui LI Guangwei DONG Hanwen 《《地质学报》英文版》2015,89(Z2):103-103
<正>The2000-km-long Indus-Tsangpo suture zone(ITSZ)in southern Tibet marks the boundary between the India and Eurasia plates and contains the remnants of the Neotethyan oceanic lithosphere,ophiolitic mélanges,flysch units and continental rocks.Field-based structural analyses and drill core observations from the Luobusa 相似文献
49.
Wei Zhang Hanwen Zhou Xiaohua Zhou Xilin Zhao Huan Liu Yang Jiang Chunzhong Li 《Island Arc》2024,33(1):e12510
Granulite facies metamorphism and crustal anatexis exist in the East Cathaysia Block, the exact timing of granulite facies partial melting and its link with orogenesis have not been well constrained. In this study, we carried out petrography, whole rock geochemistry, and zircon U–Pb dating, trace elements and Hf isotopes analyses on Dazhe gneissic granite and banded migmatite from the Badu Group in southwest Zhejiang province in the East Cathaysia Block. The melts were produced through the dehydration of biotite, such as biotite + quartz + plagioclase = orthopyroxene + K-feldspar + melt and biotite + quartz + plagioclase + sillimanite = garnet + K-feldspar + melt. Zircons from these rocks show clear core-rim structure and yield rim and core concordant ages at 233 Ma and 1.83 Ga, respectively. The zircon rims suggesting the melts and the cores are suggesting the protolith of Dazhe gneissic granite and banded migmatite were crystallized from an evolving magma. The zircon cores and rims have negative εHf(t) = −2.2 ~ −6.3 and εHf(t) = −22.8 ~ −32.4, and they give suggestion of the presence of Neoarchean components. Although the major-element compositions of the gneissic granite and banded migmatite are slightly different, the trace-element spider diagram and REE pattern show they are similar, and then we find that the protoliths are A-type granodiorite/diorite. Combined with the published data, we suggested that the Dazhe gneissic granite and banded migmatite were formed through granulite facies partial melting at 233 Ma, which was promoted by crustal shortening and thickening of the collision orogeny between East Cathaysia Block and an unknown terrane with a NNE trend structure line. The protoliths (granite or granodiorite) of Dazhe gneissic granite and banded migmatite crystallized at 1.83 Ga by reworking of the Neoarchean components of East Cathaysia Block. The Paleoproterozoic (1912–1819 Ma) collisional orogeny and the later intraplate rifting stage are corresponding to the aggregation and breakup of the Columbia supercontinent. 相似文献
50.
Relic UHP Structures in Dabie-Sulu Region, China:Structural Expression and Geodynamic Significance 总被引:3,自引:0,他引:3
Suo Shutian Zhong Zengqiu You Zhendong Zhou Hanwen Faculty of Earth Sciences China University of Geosciences Wuhan China 《中国地质大学学报(英文版)》2000,11(3)
INTRODUCTIONIn recent years a num ber of detailed m ineralogical- petro-logical studies have been carried out on the UHP and HPmetamorphic belts in the Dabie- Sulu region,central China(see review papers by Jahn,1999;Ernst and L iou,1999;Wallis et al.,1999;Hacker et al.,1996 ;L iou et al.,1996 ;Cong et al.,1994) . Various tectonic evolution models for theUHP belt in the Dabie- Sulu region have been constructed(e.g.,Webb etal.,1999;Hacker et al.,1996 ;Cong et al.,1994) .However,as … 相似文献