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Geochemical and Petrological Insights into the Neoproterozoic Moumba Metabasites: Implications for Crustal Processes in the West Congo Belt (Republic of Congo)

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Journal of Geoscience and Environment Protection 2024年第2期12卷 1-29页

作者： Ulrich Verne Matiaba-Bazika Nelson Lekeba Makamba Vicky Tendresse Télange Bouénit.la Nicy Carmelle Bazebizonza Tchiguina Timothée Miyouna Florent Boudzoumou Laboratory of Geosciences Faculty of Sciences and Technics Marien NGOUABI University Brazzaville Republic of Congo National Institute for Research in Exact and Natural Sciences (IRSEN) Brazzaville Republic of Congo Geographid Research and Cartographic Production Center (CERGEC) Brazzaville Republic of Congo

The West Congo Belt contains in its rocks of Neoproterozoic age from Nemba complex outcropping in the Moumba River. This West Congo belt is made up of a crustal segment of the Arcuaï-West Congo orogen which extends from southwest Gabon to the northeast of Angola. This study aims to constrain the geochemical signature Nemba complex of West Congo belt from the petrograhic and geochemical study on the whole rock. The petrographic data from this study show the Moumba metabasites are made up of amphibolites, metagabbros, epidotites and greenschists interstratified in the Eburnean metasediments and affected by mesozonal to epizonal metamorphism characterized by the retromorphosis of intermediate amphibolite facies minerals into greenschist facies. Whole-rock geochemical data indicate that these metabasites are continental flood basalts (CFB) of basic nature and transitional affinit. emplaced in intraplate context. These continental flood basalts are generated from magma originating from a significantly enriched shallow mantle plume and this magma then contaminated by the continental crust during their ascent. The reconstruction of tectonic signature suggests that West Congo belt would result from closure of an ocean basin with subduction phenomena. This collision would be marked by the establishment of ophiolite complex. We show that this model is incompatible with the CFB nature of metabasites and the orogenic evolution of Neoproterozoic. It does not seem that we can evoke a genetic link with a subduction of oceanic crust, because the paleogeography of Neoproterozoic (Rodinia) is marked by intracontinental rifts linked to opening of Rodinia. We therefore suggest the non-existence of ophiolitic complex in western Congo belt and reject the collisional model published by certain authors. We confirm the currently available intracontinental orogen model.

关键词： Mayombe Metabasites Moumba Mantle Plume Continental Rifting Basalts Flood Continental

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Performance S tudy for Java Virtual Machine In Embedded Systems

Performance S tudy for Java Virtual Machine In Embedded Syst...

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2010 International Conference on Bio-inspired Systems and Signal Processing(ICBSSP 2010)

作者： Liu Wenjun School of Information Engineering Nanchang Institute of Technology(nit. Nanchang 330099 China

Real time specification for Java（RTSJ） is intended for Real-time embedded *** this study,we present the architecture of a typical JVM,from the first generation,Interpreter architecture,to newest architecture,Just in... 详细信息

关键词： Real time Virtual Machine Java RTSJ

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Petrology and Geochemistry of Loukounga Metabasites Rocks: Constraining the Geodynamic Context of Neoproterozoic Nemba Complex in the Mayombe Belt

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Open Journal of Geology 2022年第11期12卷 919-946页

作者： Ulrich Verne Matiaba Bazika Vicky Tendresse Télange Bouénit.la Nelson Makamba Lekeba Florent Boudzoumou Laboratoire de géodynamique Faculté des Sciences et Techniques Université Marien Ngouabi Brazzaville Congo Département des Géosciences Institut National de Recherches en Sciences Exacts et Naturelles Brazzaville Congo

This study focuses on the metabasite rocks of the Nemba Complex of the Mayombe belt, an African segment of Araçuaï-West Congo Orogen (A-WCO) extending from the southwest of Gabon to the northwest of Angola. These metabasite rocks outcrops are in southwestern Congo along the Loukounga river. The Nemba complex is of Neoproterozoic age and represents the lower part of the west congolian Supergroup. The objective of this study is to constrain the geodynamic context of the Nemba complex from the petrology and geochemistry of the metabasites sampled in the Loukounga River. The observed rocks are composed of amphibolites, metagabbros, epidotites and greenschists and are affected by folding accompanied by flux schistosity and crenulation schistosity. Geochemical analyzes show that the rocks have a basic to ultrabasic chemical composition with SiO2 contents between 41.85% and 58.23%. The geochemical composition of the major and traces elements shows that the rocks are basalts, basaltic andesites and andesites. The magma shows enrichment in LREE, LILE and depletion in HREE and HFSE. The multielement spectra show negative anomalies in Nb-Ta, Ti and a relatively low Nb/La ratio which characterize a lithospheric source contaminated by continental crust. Traces elements discrimination plots show that Loukounga metabasites are emplaced in intraplate geodynamic context like that associated with the basalts of the trap-types continental shelves and are possibly derived from mantle plumes contemporaneous with or slightly prior to magmatism.

关键词： Nemba Complex Mayombe Loukounga Greenstone Geodynamic Context Mantle Plumes

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The Government Duty in Promoting Corporation Social Responsibility

The Government Duty in Promoting Corporation Social Responsi...

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2011 International Conference on Management Science and Intelligent Control(ICMSIC 2011)

作者： Bin LIU School of Business Administration.Nanchang Institute of Technology Nanchang Institute of Technology nit.Nanchang China

Under the influence of economy globalization,corporation social responsibility is spreading fast all over the *** the economy developing process of our country,due to the self-interest and market competition,a lot of corporations are disobeying the code of conduct and are damaging seriously the public *** the connotation of the corporation social responsibility,this paper analyses the reasons leading to the miss of the corporation social responsibility for the corporations in our *** the concrete condition of our country,this paper is aimed to put forward the roles of government in promoting the development of corporation social responsibility.

关键词： corporation social responsibility promotion government duty

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Research on the Logistics Outsourcing Based on E-commerce

Research on the Logistics Outsourcing Based on E-commerce

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2011 International Conference on Business Management and Electronic Information(BMEI 2011)

作者： Guoping JI Wenhui LIU School of Business Administration.NanChang Institute of Technology NanChang Institute of Technology nit.Nanchang City Jiangxi Province China

The logistics outsourcing is one kind of enterprises’ developing strategy pattern which is developed quickly at ***,the article analyzed the intrinsic relationship of ecommerce logistics ***,the author described the main problems in the logistics outsourcing based on e-commerce via the survey and case analysis ***,based on the above analysis,the author explored the effective strategies of the logistics outsourcing based on *** article is of great help to provide some ideas of the logistics outsourcing based on ecommerce.

关键词： Logistics outsourcing E-commerce Effective strategies

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喉罩在长时间支撑喉镜检查后保护声带脂肪移植物中的应用

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麻醉与镇痛 2009年第2期5卷 39-41页

作者： Daniel C. H. Kidani, MD nit.in K. Shah, MD 项明琼(译) Department of Anesthesiology University of California Irvine Medical Center California 不详

一例62岁男性患者在喷射通气下行直接显微喉镜检查和声带脂肪移植。长时间喉镜检查后，患者因为创伤性会厌炎出现过度通气和上呼吸道梗阻。放置喉罩后可进行通气，并可直视下观察患者会厌炎症，且不损伤脂肪移植物。因为喉罩放置在声带... 详细信息

一例62岁男性患者在喷射通气下行直接显微喉镜检查和声带脂肪移植。长时间喉镜检查后，患者因为创伤性会厌炎出现过度通气和上呼吸道梗阻。放置喉罩后可进行通气，并可直视下观察患者会厌炎症，且不损伤脂肪移植物。因为喉罩放置在声带上方并能保证有效通气，所以我们认为，直接显微喉镜检查后，患者苏醒期间可能出现通气困难，而气管内插管可能会影响手术操作，宜选择间断性喉罩通气替代气管内插管作为一种有效的过渡性通气方式。

关键词：喉罩通气脂肪移植支撑喉镜检查后移植物声带气管内插管保护

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A Wideband Rotated Rectangular DRA With CPW Feed

A Wideband Rotated Rectangular DRA With CPW Feed

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International Conference on Information and Electronics Engineering（ICIEE 2011）

作者： Sayantan Dhar 1 Rowdra Ghatak 2 Bhaskar Gupta1 and Dipak Ranjan Poddar 1 1 ETCE Department Jadavpur University Jadavpur Kolkata–700032(INDIA) 2 ECE Department nit.Durgapur Durgapur West Bengal–713209(INDIA)

A rectangular Dielectric Resonator Antenna with a co-planar waveguide fed inductive slot is proposed.A non-resonant inductive slot is used to couple energy from the CPW to the *** rectangular DRA has been rotated by 450 to obtain two orthogonal *** selecting suitable dimensions of the DRA the two orthogonal modes has been brought close enough to yield wideband *** proposed antenna has been designed to operate in the IEEE 802.11a band.

关键词： Dielectric Resonator Antenna CPW feed wideband antenna.

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Petrology and Geochemistry of Loukounga Metabasites Rocks:Constraining the Geodynamic Context of Neoproterozoic Nemba Complex in the Mayombe Belt

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Open Journal of Geology（地质学期刊） 2022年第11期

作者： ulrich verne matiaba bazika vicky tendresse télange bouénit.la nelson makamba lekeba florent boudzoumou

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