浙江省地质遗迹保护工作现状与面临的任务     

孙乐玲 《浙江国土资源》2000,(2)

本文以浙江省地质遗迹的展布特点 ,根据目前地质遗迹保护工作现状和存在的主要问题 ,提出了我省地质遗迹保护工作的任务与拟建地质遗迹保护区参考名录  相似文献   

Characteristics and distribution of clay minerals and their effects on reservoir quality: Huagang Formation in the Xihu Sag,East China Sea Basin     

X. L. Sun  X. G. Zhang  J. L. Lin  Z. X. Zhao  D. W. Huang 《Australian Journal of Earth Sciences》2013,60(8):1163-1174

Abstract

The characteristics and distribution of clay minerals and their effects on reservoir quality in the Huagang sandstones in the Xihu Sag, East China Sea Basin were studied by using X-ray diffraction, casting thin-sections, scanning electron microscopy, electron microprobe analysis, fluid inclusion analysis, constant-rate mercury injection and nuclear magnetic resonance. Clay minerals consist of kaolinite, chlorite, illite and illite–smectite mixed layer (I/S); kaolinite forms from dissolved feldspars, chlorite occurs as clay coatings that are transformed from clay precursors owing to the flocculation of suspended detrital clays or the crystallisation of pore fluids, and illite forms from the illitisation of detrital smectite, authigenic kaolinite and K-feldspars. Clay distribution is controlled by sedimentary environments, burial history and lithologies. Typical reservoirs in the western sub-sag are thin and developed in braided river facies at relatively shallow burial depths with clays dominated by kaolinite. However, typical reservoirs in the central inversion tectonic zone are thicker and developed in a braided delta front facies at deeper burial depths with clays mainly consisting of chlorite, illite and I/S. High-quality reservoirs are characterised by coarse granularity, high quartz content and low clay content with widespread development of chlorite coatings that inhibit quartz cements at low temperatures. At higher temperatures, the high-quality reservoirs develop more pores providing growth space for quartz cements and result in the coexistence of chlorite coatings and quartz cements. The high-quality reservoirs are controlled by their lithological characteristics rather than chlorite coatings. Illite and I/S clays create severe damage to reservoirs by reducing the size and connectivity of pore-throats.  相似文献   

尖吻鲈苗种工厂化培育模式的初步研究     

冯晓宇  罗儒端  孙启前  刘青利 《广东海洋大学学报》1999,(1)

采用室内水泥池及活饵培育配套技术进行尖吻鲈苗种阶段工厂化育苗。投放刚孵化出膜的仔鱼１６０万尾，经室内池８ｄ的培育，成活率为９０％；经１３ｄ的培育其规格超过１ｃｍ，成活率为５６．９％；经２４ｄ的培育平均规格达２ｃｍ左右，平均成活率为５０％，共育出８０万尾。苗种生长快，体质健壮，成活率高。关键技术是：基础设施配套；采用不同活饵，做到适口、及时转化、足量；定期过筛分级培育；水质控制良好；注意防病。２ｃｍ以上鱼种阶段采用多种方式培育，经１５～２０ｄ的饲养，规格达３～４ｃｍ，平均成活率为６５％～７５％。  相似文献   

RECENT SEDIMENTATION AND SUSPENDED MATTER IN ERHAI LAKE,YUNNAN PROVINCE,CHINA   总被引：1，自引：0，他引：1  

孙顺才  张琛  宋学良 《中国海洋湖沼学报》1999,17(2):170-180

INTR0DUCnONErhailake,thesecondlargestlakeintheYUnnanPlateauinS0uthWstChina,islo-catedinDaliDefecthe25035'to25"58'N,looo05't0l(X)o07'E(Fig.l)-The40kInlong3-9kInwidelakeisnaInedafteritsearlikeshape.ItsbasicchimteristicsaregiveninTablel.EtheibeeisampicalriftlakeintheDalibasinwhichdeveloPedalongtheYuaniangHongheThewestsideofthebasinisformedbytheDiancangMountainwhichconsists0frock(PrecaInbrianschistandgneissandMiocenemetaInrphiclimestone).TheseisndcallystillactivemoUntainrangrisab0ut…  相似文献   

Numerical simulation of ductile shear localization: Plastic‐flow network and slip‐line field     

Sheng‐zu Wang  Jun‐xiu Sun  Jie‐yuan Ning 《国际地质力学数值与分析法杂志》2008,32(3):307-324

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Coherent control of non-resonant two-photon transition in molecular system     

张晖  张诗按  王祖赓  孙真荣 《海洋学报(英文版)》2010,29(11)

In this paper, we study theoretically and experimentally the coherent control of non-resonant two-photon transition in a molecular system (Perylene dissolved in chloroform solution) by shaping the femtosecond pulses with simple phase patterns (cosinusoidal and π phase step-function shape). The control efficiency of the two-photon transition probability is correlated with both the laser field and the molecular absorption bandwidth. Our results demonstrate that, the two-photon transition probability in a molecular system can be reduced but not completely eliminated by manipulating the laser field, and the control efficiency is minimal when the molecular absorption bandwidth is larger than twice the laser spectral bandwidth.  相似文献   

Geochemistry and spatial distribution of late-Paleozoic mafic volcanic rocks in the surrounding areas of the Gonghe Basin: Implications for Majixueshan triple-junction and east Paleotethyan archipelagic ocean     

Guo  AnLin  Zhang  GuoWei  Sun  YanGui  Cheng  ShunYou  Yao  AnPing 《中国科学:地球科学(英文版)》2007,50(2):292-304

The late-Paleozoic mafic volcanic rocks occurring in the surrounding areas of the Gonghe basin are distributed in the A’nyêmaqên ophiolite zone, Zongwulong tectonic zone and Kuhai-Saishitang volcanic zone. The mafic volcanics in the A’nyêmaqên zone formed an ancient ridge-centered hotspot around the Majixueshan OIB, the Kuhai-Saishitang mafic rocks consist of E-MORB and continental rift basalts and the Zongwulong volcanic rocks are enriched N-MORB. The regionally low Nb/U and Ce/Pb ratios reflect the influence of the OIB material on the mafic magma source. From geochemistry, spatial distribution and tectonic relationship of the mafic rocks, an ancient triple-junction centered at the Majixueshan can be inferred. The existence of the Kuhai-Saishitang aulacogen may have provided a tectonic channel for the Majixueshan OIB materials metasomatizing the magma source for the Zongwulong rocks. The formation of the triple-junction and the rifting of the Zongwulong zone have separated the orogens and massifs in the region.

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对影响招远市黄金矿山地质环境评价的几点认识          下载免费PDF全文

孙瑞刚  魏绪峰  宋明忠 《山东国土资源》2008,24(5):33-36

招远市黄金资源蕴藏丰富，开采历史悠久，素有“金城天府”之称，建国以来，累计向国家交售黄金近200t，是全国第一产金大市（县）。其矿山地质环境问题不同于一般的县市，通过对其矿山地质环境特点的分析，认为招远市金矿区矿山地质环境影响评价的重点为采空塌陷，地裂缝，渣石流等地质灾害及水环境等。  相似文献   

UCD航摄像片在大比例尺地形图中的应用   总被引：2，自引：0，他引：2  

孙粉霞  邹学忠 《现代测绘》2009,32(4):41-41,48

本文阐述了UCD数码航摄相机的原理、功能及优点,结合在生产中的应用实践,分析了UCD数码航摄像片的成图精度.  相似文献   

Authigenic iron oxide formation in the estuarine mixing zone of the Yangtze River   总被引：2，自引：0，他引：2  

D. J. Fan  R. D. Neuser  X. G. Sun  Z. S. Yang  Z. G. Guo  S. K. Zhai 《Geo-Marine Letters》2008,28(1):7-14

Estuaries are elementary geochemical fronts where river water and seawater mix. Within this mixing zone, iron and other non-conservative elements can undergo complex reactions to form new solid phases. In order to understand authigenic iron oxide formation in the Yangtze River Estuary, two onsite water-mixing sets of experiments were conducted, one by mixing variable amounts of unfiltered Yangtze River water with filtered East China Sea water of different salinity (set 1), the other by mixing variable amounts of filtered Yangtze River water with filtered East China Sea water of different salinity (set 2). In set 2, the minerals newly formed in the course of mixing were investigated by means of a scanning electron microscope fitted with an energy-dispersive X-ray analytical system. It was found that ferrihydrite and lepidocrocite were formed in these mixing experiments, coexisting in nearly equal amounts. These iron oxides appear as aggregated particles with a large grain-size range of several microns to more than 100 μm. The electrolytic properties of seawater played an important role in the formation of these authigenic iron oxides. Kaolinite and organic aggregates were also found in the experimentally mixed pre-filtered waters. Amounts of newly formed suspended matter (set 2) were one to three orders of magnitude lower than those of total suspended matter (TSM) (set 1). This implies that newly formed minerals represent only a very small proportion of TSM in the estuarine mixing zone of the Yangtze River.  相似文献