检索结果-南通市图书馆

GEOLOGY OF MT. PHULCHOKI AREA, CENTRAL NEPAL

地学前缘 2000年第S1期7卷 22-22页

作者： Funakawa Satoshi(Osaka City university,Sumiyoshi\|ku, Osaka 558\|8585,Japan)

The Nawakot and Kathmandu complexes are distributed around Kathmandu area, central Nepal and that build up the Mahabharat synclinorium. The Nawakot complex is composed of mainly weakly metamorphosed sedimentary rocks. The Kathmandu complex, which occupies the large core of the synclinorium, overlies the Nawakot Complex.. These two complexes have the thrust contact called as the Mahabharat Thrust. The Kathmandu complex is subdivided into the lower Bimphedi and the upper Phulchoki Groups. The Bimphedi Group is composed of metamorphosed sedimentary rocks and the Phulchoki Group is of weakly and non\|metamorphosed sedimentary rocks. Besides its important significance, only few studies have been done in these complexes. In this paper, the present author reports preliminarily the stratigraphy of the Phulchoki Group and uppermost part of the Bimphedi Group distributed in the south of Kathmandu. In the study area, weakly to non\|metamorphosed sedimentary rocks is subdivided stratigraphically into Units I to VII in ascending order. These units are characterized by the prominent composition of rock types. Most contacts observed at each adjacent units are conformable and some are transitional. Most of units show the regional variation in accompanying rock type. Unit I: coarsely crystallized marble; Unit II: black to green phyllite; Unit III: light gray quartzose fine sandstone and gray siltstone; Unit IV: well\|bedded sandy argillaceous limestone; Unit V: purple siltstone; Unit VI: coarsely crystallized limestone; Unit VII: siltstone and sandstone. Correlation to the formations named by Stocklin’s (1980) subdivision are as follows: Unit I might be correlated to the Markhu Formation, Units II and III to the Tistung Formation, Unit IV to the Chandragiri Formation, Unit V to the Chitlang Formation, and Units VI and VII to the Godawari *** the study area, some fossils are yielded. Crinoids occur from Units IV, V, VI and VII, brachiopods from Units V, VI and VII, orthoce

关键词： Kathmandu complex Phulchoki Group stratigraphy fossils

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

不同激发条件下SiO_2.Tb^(3.)溶胶-凝胶光波导薄膜玻璃的荧光特性

引用

中国稀土学报 2005年第S2期23卷 38-41页

作者：侯嫣嫣林海杨殿来马铁成大连轻工业学院化工与材料学院辽宁大连116034

采用溶胶-凝胶法,制备了Tb3.掺杂的二氧化硅光波导薄膜和玻璃,采用扫描电子显微镜(SEM)对光波导薄膜层进行了表征。SEM观察结果表明,经三层涂覆的薄膜厚度达到1.5μm,多层涂覆对薄膜厚度的调节作用明显,有利于满足模式传输的要求。测试... 详细信息

采用溶胶-凝胶法,制备了Tb3.掺杂的二氧化硅光波导薄膜和玻璃,采用扫描电子显微镜(SEM)对光波导薄膜层进行了表征。SEM观察结果表明,经三层涂覆的薄膜厚度达到1.5μm,多层涂覆对薄膜厚度的调节作用明显,有利于满足模式传输的要求。测试并研究了溶胶-凝胶玻璃的激发和发射光谱。光谱分析表明,3.5 nm长波紫外光可有效激发SiO2.质,获得SiO2.质的宽谱带本征发射,同时观察到微弱的Tb3.特征发射峰;2.0 nm短波紫外光可高效激发Tb3.,获得Tb3.在SiO2.质中的特征发射峰。均匀透明并具有高效可见发光性质的稀土掺杂溶胶-凝胶SiO2.膜和玻璃在光波导器件研制方面具有良好的应用前景。

关键词： Tb3.离子溶胶-凝胶光波导薄膜荧光光谱稀土

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

棕壤不同粒级微团聚体中磷素的保持与供应

引用

土壤通报 2001年第3期32卷 113-115页

作者：汪景宽张继宏王雷陈恩凤沈阳农业大学土壤肥力研究室辽宁沈阳110161

采用对比法对采自辽宁省主要地区 1 8对不同肥力典型棕壤中不同粒级微团聚体内全磷的分布以及对磷素的保持与供应状况进行研究 ,结果表明 ,高肥土壤全磷平均含量为 0 .61 1± 0 .1 83./kg ,低肥的为 0 .3.9± 0 .0 95 g/kg ;高肥土壤平... 详细信息

采用对比法对采自辽宁省主要地区 1 8对不同肥力典型棕壤中不同粒级微团聚体内全磷的分布以及对磷素的保持与供应状况进行研究 ,结果表明 ,高肥土壤全磷平均含量为 0 .61 1± 0 .1 83./kg ,低肥的为 0 .3.9± 0 .0 95 g/kg ;高肥土壤平均吸附磷量为 1 2.7.1± 3..1 7g/kg ,低肥的为 2.3..2. 4 7.2.8g/kg;解吸磷和解吸率高肥的为 2.6.8± 1 0 .77g/kg和 3. .65± 2.5 .66% ,低肥的为 2.1 .3. 8.98g/kg ,和 9.62. 4 .99% .高肥土壤中各粒级微团聚体的全磷含量、磷素的解吸及其解吸率都高于低肥的对应值 ,其中 ,1 0～ 5 0 μm微团聚体中磷素储量最大 ,<1 0 μm微团聚体在磷素的吸附和保持方面贡献最大 ,因此可以把它们作为棕壤的特征微团聚体 .

关键词：棕壤微团聚体磷素吸附解吸粒级土壤肥力

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

On the cratonization of the Arabian-Nubian Shield: Constraints from gneissic granitoids in south Eastern Desert, Egypt

引用

Geoscience Frontiers 2021年第4期12卷 215-243页

作者： Ali A.Khudeir Jean-Louis Paquette Kirsten Nicholson Åke Johansson Tyrone O.Rooney Sadiq Hamid Mohamed A.El-Fadly Loretta Corcoran Shawn J.Malone Mohamed Ali Abu El-Rus Geology Department Faculty of ScienceAssiut University71516Egypt UniversitéClermont Auvergne CNRSIRDOPGCLaboratoire Magmas et VolcansF-63000 Clermont-FerrandFrance Ball-State university Department of EnvironmentGeology and Natural Resources117 Fine Art BuildingMuncieIN 47306USA Department of Geosciences Swedish Museum of Natural HistoryBox 50007SE-10405 StockholmSweden Department of earth and Environmental sciences Michigan-State UniversityEast LansingMI 48824USA Notre Dame university Department of Civil and Environmental Engineering and Earth Sciences156 Fitzpatrick HallNotre DameIN 46556USA

The Shaitian granite complex(SGC)spans more than 80 Ma of crustal growth in the Arabian–Nubian Shield in southeast *** is a voluminous composite intrusion(60 km2.comprising a host tonalite massif intruded by subordinate dyke-like masses of trondhjemite,granodiorite and *** host tonalite,in turn,encloses several,fine-grained amphibolite enclaves.U-Pb zircon dating indicates a wide range of crystallization ages within the SGC(800±18Ma for tonalites;754±3.9 Ma for trondhjemite;73.±3.8 Ma for granodiorite;and 717±3.2.Ma for monzogranite),suggesting crystallization of independent magma *** high positiveεNdi(+6–+8)indicate that the melting sources were dominated by juvenile material without any significant input from older *** of zircon saturation geothermometry indicates increasing temperatures during the generation of melts from 745±3.℃ for tonalite to 810±2.℃ for trondhjemite;840±10℃ for granodiorite;and 868±10℃ for *** pressure of partial melting is loosely constrained to be below the stability of residual garnet(3.kbar for the stability of residual amphibole as inferred from the significantly lower NbN and TaN compared with LREEN and the sub-chondrite Nb/Ta ratios exhibited by the granitic *** inverse relation between the generation temperatures and the ages estimates of the granitoid lithologies argue against a significant role of fractional *** major and trace element contents indicate the emplacement of the SGC within a subduction zone *** lacks distinctive features for melt derived from a subducted slab(*** Sr/Y and high(La/Yb)N ratios),and the relatively low MgO and Ni contents in all granite phases within the SGC suggest melting within the lower crust of an island arc overlying a *** melts produced during melting experiments indicates an amphibolite of basaltic composition is th

关键词： Arabian-Nubian Shield(ANS) Cratonization Fractional crystallization Partial melting Subduction zones Tonalite-Trondhjemite-granodiorite(TTG)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：