检索结果-南通市图书馆

CARBONATITES FROM THE EASTERN HIMALAyan SYNTAXIS: PETROLOGY AND TECTONIC IMPLICATIONS

地学前缘 2000年第S1期7卷 10-11页

作者： liu yan 1, zhong {2. 2. {4. jianqing 3.1 institute of Geology, chinese Academy of geological Sciences, Bei{4.ng 10003., china 2.institute of Geology & Geophysics, chinese Academy of Sciences, Bei{4.ng 10002., china 3.Department of Geology, Pek

Most carbonatites occur in relatively stable, intra\|plate areas but some are found to occur in near to plate margins and may be linked with plate separation (Woolley, 1989). Although many carbonatites have been discovered to occur in the orogenic belts in recent years, most of these rocks are related to post\|orogenic magmatism, that is, the rocks occur in the specially extensional setting. Therefore it is unusual that such magmatic rocks occur in the typical convergent environment. Here we report carbonatites and associated ultramafic and mafic rocks in the core of the eastern Himalayan syntaxis. The eastern Himalayan syntaxis consists of three tectonic units: the Gangdise, the Yarlung Zangbo, and the Himalayan units, each of which is bounded by faults ({3. & {4., 1997). The Himalayan unit, the northernmost exposed part of the Indian plate, is divided into two complexes, the amphibolite facies complex in the south and the granulite facies complex in the north. The granulite facies complex in the Himalayan unit have been argued to experience high\|pressure metamorphism and represent materials buried to upper\|mantle depths ({3. & {4., 1997). The carbonatites and associated ultramafic and mafic rocks only occur in the granulite facies rocks and are divided into two belts: northern and southern *** northern belt extends at least 3.km, and is about 2.km in width. The southern belt extends several kilometers, and is 3.m or so in width. Each belt consists mainly of differently compositional dykes, extending parallel to gneissosity of granulite facies gneiss. Carbonatitic agglomerates are observed in the northern belt. From the center of carbonatite dykes to country rocks, five types of rock are observed: the center parts of carbonatites, the rim parts of carbonatites, ultramafic and mafic rocks, altered rocks and country rocks. The gneissosity of country rock was deformed by intrusion of dykes.

关键词： Eastern Himalayan Syntaxis carbonatites ultramafic rocks carbonatitie magmatism convergent environment

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

Characterization of rock thermophysical properties and factors affecting thermal conductivity−A case study of Datong Basin,china

引用

Journal of Groundwater Science and Engineering 2024年第1期12卷 4-15页

作者： Meng-lei ji Shuai-chao Wei Wei Zhang Feng liu Yu-zhong Liao Ruo-xi Yuan Xiao-xue {{3. Long Li institute of Hydrogeology and Environmental Geology Chinese Academy of Geological SciencesShijiazhuang 050061China Technology Innovation Center of Geothermal&Hot Dry Rock Exploration and Development Ministry of Natural ResourcesShijiazhuang 050061China china University of Geosciences(Beijing) Beijing 100083China

Rock thermal physical properties play a crucial role in understanding deep thermal conditions,modeling the thermal structure of the lithosphere,and discovering the evolutionary history of sedimentary *** advancements in geothermal exploration,particularly the identification of high-temperature geothermal resources in Datong Basin,Shanxi,china,have opened new *** study aims to characterize the thermal properties of rocks and explore factors influencing thermal conductivity in basins hosting high-temperature geothermal resources.A total of 70 groups of rock samples were collected from outcrops in and around Datong Basin,Shanxi *** property tests were carried out to analyze the rock properties,and the influencing factors of thermal conductivity were studied through experiments at different temperature and water-filled *** results indicate that the thermal conductivity of rocks in Datong,Shanxi Province,typically ranges from 0.690 W/(m·K)to 6.4.0 W/(m·K),the thermal diffusion coefficient ranges from 0.4.1 mm^({3./s to {3.0{3. mm^({3./s,and the specific heat capacity of the rocks ranges from 0.569 KJ/(kg·℃)to 1.117 KJ/(kg·°C).Experimental results reveal the impact of temperature and water saturation on the thermal conductivity of the *** thermal conductivity decreases with increasing temperature and rises with high water saturation.A temperature correction formula for the thermal conductivity of different lithologies in the area is proposed through linear *** findings from this study provide essential parameters for the assessment and prediction,development,and utilization of geothermal resources in the region and other basins with typical high-temperature geothermal resource.

关键词： Datong Basin Rock thermal conductivity Thermal diffusivity Specific heat capacity Influencing factors

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Zircon SHRIMP U-Pb Ages,Geochemistry and Nd-Hf Isotopes of~1.0 Ga A-Type Felsic Rocks in the Southwestern yangtze Block,South china:Petrogenesis and Tectonic Implications

引用

Journal of Earth Science 2023年第2期34卷 504-517页

作者： ji-Biao Zhang Xiao-zhong Ding yan-Xue {{3. institute of Geology Chinese Academy of Geological SciencesBeijing 100037China

The petrogenesis and tectonic affinity of Late Mesoproterozoic igneous rocks in the yangtze Block are important to understand its tectonic evolution within the context of the Rodinia supercontinent’s ***,we report the SHRIMP zircon U-Pb ages,geochemistry,and Nd-Hf isotopic data for dacite from the Zegu Formation of the Dengxiangying Group in southwestern yangtze *** crystallization age of the Zegu dacite is 103. *** rocks have relatively high Ga,Zr,Hf,and HREE contents,as well as high(10000×Ga)/Al(2.7-2.9)and FeOt/MgO(3.8-10.5)ratios,showing a geochemical affinity of A-type ***,they are characterized by negativeεNd(t)(-3.6 to-7.5)and zirconεHf(t)values(-0.3.to-14.4.,indicating that they likely generated via partial melting of an ancient continental crust *** tectonic discriminant diagrams showed that the Zegu dacites have high Y and Nb contents(plotted in the‘within-plate’magmatic rocks field).In conclusion,the geochemistry and isotopic data indicated that the 103. Ma felsic volcanic rock in the Dengxiangying Group generated during an intra-plate rift basin along a passive *** work thus argues against a Grenvillian orogen’s existence in the yangtze *** view of the subsequent Neoproterozoic subduction-related magmatism in the region,we suggest that the yangtze Block might have been along the periphery of the Rodinia.

关键词： A-type granotoids zircon SHRIMP U-Pb dating intra-plate magmatism Late Mesoproterozoic Southwestern yangtze Block geochemistry

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

钛铁矿在捕收剂1,10-菲罗啉作用下的浮选行为

引用

Transactions of Nonferrous Metals Society of china 2024年第3期34卷 995-1002页

作者：陈攀刘佳燕李维斯翟计划杨耀辉中南大学资源加工与生物工程学院长沙410083 中国地质调查局成都矿产综合利用研究所成都610000 成都理工大学材料与化学化工学院成都610059

引入1,10-菲罗啉(Phen)作为钛铁矿与钛辉石选择性分离的新型捕收剂。浮选实验表明,与苯甲羟肟酸(BHA)相比,在pH 2.12.间,Phen是钛铁矿浮选更加有效的捕收剂,并且在pH 6时钛铁矿的回收率提高最大(约为2.%)。在浮选过程中,钛辉石的可浮... 详细信息

引入1,10-菲罗啉(Phen)作为钛铁矿与钛辉石选择性分离的新型捕收剂。浮选实验表明,与苯甲羟肟酸(BHA)相比,在pH 2.12.间,Phen是钛铁矿浮选更加有效的捕收剂,并且在pH 6时钛铁矿的回收率提高最大(约为2.%)。在浮选过程中,钛辉石的可浮性保持在非常低的水平(回收率<5%)。FTIR和XPS分析表明,Phen和BHA以化学吸附的方式吸附在钛铁矿表面,并且钛铁矿与Phen之间的相互作用比BHA更强。XPS结果还表明,Phen在钛铁矿表面与铁(亚铁和铁)和钛发生反应,在Phen吸附到钛铁矿表面的过程中形成五元环结构。

关键词：钛铁矿 1,10-菲罗啉浮选苯甲羟肟酸

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

从地球化学角度看微亮晶臼齿碳酸盐岩形成的环境条件——以吉辽地区新元古代微亮晶碳酸盐岩为例

引用

天然气地球科学 2004年第2期15卷 150-155页

作者：旷红伟金广春刘燕学孟祥化葛铭长江大学地球物理系湖北荆州434023 长江大学地球化学系地球化学重点实验室湖北荆州434023 中国地质科学院地质所北京100037 中国地质大学沉积盆地研究所北京100083

近年来随着对前寒武纪研究的进一步开展,中晚元古代地层的一种被称为"臼齿碳酸盐岩[MolarTooth(简称MT)Carbonates]"或"微亮晶碳酸盐岩"或"臼齿构造(MolarToothStructure,简称MTS)"的沉积现象受到了国际地学界的重视。臼齿碳酸盐岩特指... 详细信息

近年来随着对前寒武纪研究的进一步开展,中晚元古代地层的一种被称为"臼齿碳酸盐岩[MolarTooth(简称MT)Carbonates]"或"微亮晶碳酸盐岩"或"臼齿构造(MolarToothStructure,简称MTS)"的沉积现象受到了国际地学界的重视。臼齿碳酸盐岩特指由微亮晶方解石组成、具肠状褶皱席(Ptygmaticallyfoldedsheets)构造的元古代碳酸盐岩。臼齿碳酸盐岩在地质历史中扮演着重要的角色,其似乎成了早元古代火山喷发热水沉淀碳酸盐与显生宙带壳化石碳酸盐沉积之间的桥梁,更重要的是在地球生命演化中起着重要的作用。利用现代测试手段和方法对吉辽地区新元古代含臼齿碳酸盐岩地层剖面砂岩的氧化物含量、稀土元素和臼齿碳酸盐岩的碳同位素、氧同位素、锶同位素、生物标志物、能谱进行了分析,从地球化学角度揭示了臼齿碳酸盐岩形成的构造背景、古温度场、形成时限、物质组分和沉积环境特征等,从而印证了沉积学研究成果:吉辽地区的臼齿碳酸盐岩主要发育在新元古代地层中,大约在750～900Ma左右;MT形成于华北地台稳定构造背景之下低纬度、古水温一般在50℃左右的热带气候条件下的内缓坡环境中;MT由微亮晶方解石和基质两部分组成。

关键词：地球化学微亮晶碳酸盐岩吉辽地区新元古代

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

平原M5.5地震土壤气地球化学特征及成因

引用

地震地质 2024年第2期46卷 433-448页

作者：苏淑娟陈其峰孙豪刘军冯梁乐徐继龙杨彦明雒昆利山东省地震局济南250000 中国科学院地理科学与资源研究所北京100101 内蒙古自治区地震局呼和浩特010010 中国地震局地质研究所地震动力学国家重点实验室北京100029

2.2.年8月6日2.3.分,山东省德州市平原县发生M5.5地震。文中跨震中布设{3.长3.km的勘测线,现场测量了土壤气Rn、CO_(2.和Hg浓度。结果表明:1)土壤气浓度表现出明显的空间差异,震中区与{3.测线的东、西两端气体浓度相对较高。2.土壤气... 详细信息

2.2.年8月6日2.3.分,山东省德州市平原县发生M5.5地震。文中跨震中布设{3.长3.km的勘测线,现场测量了土壤气Rn、CO_(2.和Hg浓度。结果表明:1)土壤气浓度表现出明显的空间差异,震中区与{3.测线的东、西两端气体浓度相对较高。2.土壤气浓度的空间分布特征在震中及其东部地区相似,但在震中西部差异较大,在西部旧城断裂(F_(3.)附近,Rn和CO_(2.的浓度高于震中区,推测应与地震活动和F_(3.控制的鼻状构造有关。3.Rn、CO_(2.和Hg的浓度在陵县-冠县断裂(F_(1))和F_(3.附近出现高值异常,余震自F_(1)向F_(3.发展,结合地质与地球物理研究资料推断,平原M5.5地震应与F_(1)和F_(3.共同作用有关。以上结果表明,气体地球化学方法能较好地指示隐伏断层的位置与展布方向。

关键词：平原M5.5地震断层土壤气浓度陵县-冠县断裂旧城断裂构造地球化学

来源：

维普期刊数据库博看期刊

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

Distribution characteristics and source of BTEX in groundwater in Guangzhou,Guangdong Province,***

引用

Journal of Groundwater Science and Engineering 2016年第3期4卷 238-246页

作者： liu Chun-yan SUN ji-chao jiNG ji-hong ZHANG Ying GUO Wei-xuan institute of Hydrogeology and Environmental Geology Chinese Academy of Geological SciencesShijiazhuang 050061China Hebei Branch of Construction and Administration of South-to-North Water Diversion Middle Route Hebei Province 05000China

In order to find out the distribution characteristics of BTEX in groundwater, which include Benzene, Toluene, Ethylbenzene, p-Xylene, m-Xylene, and o-Xylene, 82.groups of groundwater samples and 10 surface water samples collected from Guangzhou in Guangdong during 2.05 to 2.08 were tested by gas chromatography and mass spectrum(GC/MS). The result showed that the BTEX concentration in groundwater does not exceed the standard. The detection rate of BTEX is 1{3.63. in groundwater, and the total BTEX concentration is lower than 9.5 μg/L. Of 6 kinds of BTEX, toluene had the highest detection rate(12.2.%) and detection value(9.5 μg/L), which was followed by Benzene, with the detection rate of 3.65%, and detection value of {3.9 μg/L respectively; most of samples with BTEX are distributed in Huangpu district, Baiyun district, Huadu district and other industrialized areas; this spatial distribution and urban distribution have obvious consistency. With economic development, plant expansion and population growth led to a large amount of waste water discharge, and infrastructure construction is lagging behind, indicating that rapid urbanization is a major driving force of BTEX in groundwater, and through the analysis of a typical area, it is found that benzene system surface water infiltration was an important source of BTEX in groundwater of Guangzhou.

关键词： Guangzhou Groundwater BTEX Distribution characteristics Source to investigate

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

西宁市浅层地下水化学特征及形成机制

引用

环境科学 2023年第6期44卷 3228-3236页

作者：刘春燕于开宁张英荆继红刘景涛中国地质科学院水文地质环境地质研究所石家庄050061 河北省地下水污染机理与修复重点实验室石家庄050061 河北地质大学河北省高校生态环境地质应用技术研发中心石家庄050031

地下水是西部干旱地区重要的供水水源,随着西部大开发战略的深入,工业化和城市化发展加大了西宁市对地下水资源量的需求,不合理的开发利用已引起地下水环境发生变化,探明地下水化学演化特征及形成机制,对防止其恶化,确保可持续利用至关... 详细信息

地下水是西部干旱地区重要的供水水源,随着西部大开发战略的深入,工业化和城市化发展加大了西宁市对地下水资源量的需求,不合理的开发利用已引起地下水环境发生变化,探明地下水化学演化特征及形成机制,对防止其恶化,确保可持续利用至关重要.运用水化学和多元统计技术相结合的方法,分析了西宁市地下水化学特征,探讨了地下水的形成机制和不同因子的影响程度.结果表明,西宁市浅层地下水化学类型多达3.种,以HCO_(3.-Ca(Mg)(占比60.00%)和HCO_(3.·SO_(4.-Ca(Mg)(占比11.81%)为主,草地、林地和裸地中地下水化学类型5~6种,建设用地和耕地中地下水化学类型复杂,多达2.种,表明受到人类活动影响较强.研究区地下水化学演化过程主要受岩石风化溶滤、蒸发结晶和阳离子交换作用综合影响,主要控制因素分别是水-岩相互作用(贡献率为2..56%)、工业废水排放(贡献率为16.16%)、酸碱环境(贡献率为16.00%)、化肥、农药的过量施用(贡献率为1{3.1%)和生活污水(贡献率为8.82.).针对西宁市地下水化学特征及其人类活动影响,提出了地下水资源开发利用方面的管控建议.

关键词：西宁市地下水水化学特征形成机制多元统计控制因素

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

Zircon SHRIMP U-Pb dating of the Neogene coral reefs,Xisha Islands,South china Sea:implications for tectonic evolution

引用

china Geology 2018年第1期1卷 49-60页

作者： Hong Xu Zhao-peng ji Shan-ying Lie yan-qiou yang Shou-jie {{4. Hai-yang Zhang Shu-shen Lu Tong-qiang Shi Meng Tao Na Qin Wei-wei Zhang Da-peng Su Long-wei Qiu Qingdao institute of Marine Geology China Geological SurveyQingdao 266071China Key Laboratory of Marine Sedimentology and Enwronmental Geology First Institute of OceanographyQingdao 266061China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071China College of Earth Science and Engineering Shandong University of Science and TechnologyQingdao 266590China School of Geosciences China University of Petroleum (East China)Qingdao 266580China Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals Shandong University of Science and TechnologyQingdao 266590China Beijing SHRIMP Center Instrtute of GeologyChinese Academy of Geological SciencesBeijing 100037China

The Xisha Block is a minor one in the South china Sea and an important tectonic unit in the northwestern part of the *** SHRIMP U-Pb ages for three volcanic intrusive core samples from Xike-1,an exploratory well penetrating the bioherms of the Xisha *** core samples are from the Miocene reef carbonate bedrock and are recognized as dark-gray biotite-hornblende gabbro,gray fne-grained biotite diorite,and gray fine-grained granite,*** cathodoluminescence (CL)images and trace Th,U and Pb compositions of the zircons show that these rocks are of volcanic intrusive *** SHRIMP U-Pb dating yielded six groups of ages,ranging from 2.51-1 857 Ma to early Cretaceous, which indicate that the formation and evolution of the Xisha Block was affected by the evolution and closure of Neotethys Ocean,probably within its eastern extension into South china *** old,deepsourced material,including fragments from Rodina supercontinent,and recent mantle-derived magma products contributed to the emergence and formation of the Xisha *** SHRIMP U-Pb results also proved that this process differed from that of the Kontum massif,the Hainan Block,and the South china Block,but is similar to that of the Nansha and {4.sha *** process was associated with the effects of yanshanian magmatism induced by subduction mechanisms of the Paleo-Pacific Plate or the reworking of the multiple magmatisms since the Early to mid-yanshanian,possibly jointly experienced by the Xisha-{4.sha-Nansha Block.

关键词： Geochronology Volcamc intrusive rocks Zircon SHRIMP U-Pb dating Rodma supercontment Xisha Block South china Sea

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

海底玄武岩玻璃中蚀变微结构:探索海洋深地生物圈的新材料

引用

古生物学报 2021年第2期60卷 281-298页

作者：陆炫臣颉炜罗茂韩喜球余星刘吉强邱中炎河海大学海洋学院南京210098 南方海洋科学与工程广东省实验室(广州) 广州511458 现代古生物学和地层学国家重点实验室中国科学院南京地质古生物研究所南京210008 中国科学院生物演化与环境卓越创新中心南京210008 海底科学重点实验室自然资源部第二海洋研究所杭州310012

玄武岩玻璃中的生物蚀变微结构为微生物摄取玄武岩玻璃中营养成分,通过新陈代谢产生有机酸溶解玄武岩玻璃而形成的微米级孔洞或钻穴。生物蚀变微结构在现代海洋洋壳及代表古老洋壳残片的蛇绿岩和绿岩带中广泛存在。研究玄武岩玻璃中蚀... 详细信息

玄武岩玻璃中的生物蚀变微结构为微生物摄取玄武岩玻璃中营养成分,通过新陈代谢产生有机酸溶解玄武岩玻璃而形成的微米级孔洞或钻穴。生物蚀变微结构在现代海洋洋壳及代表古老洋壳残片的蛇绿岩和绿岩带中广泛存在。研究玄武岩玻璃中蚀变微结构的形态特征、形成机制及其时空分布,不仅对探索地球早期生命起源和演化具有重要启示意义,也为研究海洋深地生物圈的微生物组成及其时空演化提供了新材料。形态学上,生物蚀变微结构分为颗粒和管状微结构。某些非生物成因微结构与生物蚀变微结构相似,识别生物蚀变微结构还需结合元素、同位素地球化学、有机质及DNA检测等方面研究手段。对全球玄武岩中生物蚀变微结构的时空分布总结表明其在地质历史时期普遍存在,并在洋壳垂向分布上可能密切受控于岩石的孔隙度和渗透率。不同海底环境,如氧化还原条件、酸碱度、深度、温度及孔隙度等都会影响微生物群落及其代谢方式,从而形成不同类型的生物蚀变微结构。具体哪些因素对玄武岩玻璃中生物蚀变微结构起主要控制作用还需进一步探索。

关键词：玄武岩玻璃生物蚀变微结构遗迹化石海洋深地生物圈

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

在线全文

在线全文

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

在线全文

在线全文

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：