Neoproterozoic Crustal Reworking and Growth in the Zhangbaling Uplift, Tan-Lu Fault Zone: Evidence from the Feidong Complex and Zhangbaling Group

Intensive mid-Neoproterozoic magmatism is the salient feature of the Yangtze Block,preserving abundant information about crustal reworking and growth.Zircon U-Pb-Lu-Hf isotope analysis was performed on material from the Feidong Complex(FDC)and Zhangbaling Group(ZBLG)of the Zhangbaling Uplift,in order to determine the age and magmatic source of the Neoproterozoic igneous rocks as well as the detrital provenance for the sedimentary rocks,to further provide important data for understanding the mid-Neoproterozoic crustal evolution of the Northeast Yangtze Block.The amphibolite and gneissic granites in the Feidong Complex(FDC)gave similar protolith ages of 782-776 Ma.The synmagmatic zircons exhibited variable negativeεHf(t)values of-26.9 to-8.3.Early(ca.2.4 Ga)to late Paleoproterozoic(ca.2.0-1.9 Ga)inherited zircons were found in the gneissic monzogranite,with negativeεHf(t)values of-11.2 to-7.2,indicating strong reworking of the ancient crustal materials of the Northeast Yangtze Block.Whereas the amphibolites represent minor crustal growth through emplacement of continental rifting-related mafic magmas.The quartz-keratophyres in the Xileng Formation of the ZBLG in contrast systematically yield young protolith crystallization ages of 754-727 Ma with highεHf(t)values of-2.0 to+5.6,indicating their derivation from the reworking of juvenile crustal materials.The detrital zircons from the metasiltstone in the Beijiangjun Formation yield variable^(206)Pb/^(238)U ages(871-644 Ma)with a peak age at 741±11 Ma andεHf(t)values of-4.3 to+5.3,which is consistent with those of the Xileng Formation,but distinct from the FDC,indicating that the provenance of the metasiltstone is primarily the underlying Xileng Formation.The mid-Neoproterozoic igneous and sedimentary rocks of the Zhangbaling Uplift were products from continental rifting zones along the northern margin of the Yangtze Block,situated in different positions from the Susong Complex and the Haizhou Group.The transition from ancient to juvenile crustal sources for felsic magmatic rocks is attributed to gradually increased crustal extension during continental rifting.

Crustal Accretion and Reworking within the Khanka Massif: Evidence from Zircon Hf Isotopes of Phanerozoic Granitoids

The Central Asian Orogenic Belt(CAOB)is one of the largest Phanerozoic accretionary orogen.(Windley et al.,1990,2007;Jahn et al.,2000a,b,c;Yakubchuk,2002,2004;Xiao et al.,2003,2004).It is the optimal study area for revealing the accretion and reworking processes of the continental crust.The Khanka Massif is located in the most eastern part of the CAOB,and mainly crops out in the territory of Russia,with a small segment in NE China.In addition,a large number of multi-stage granitic rocks are formed in geological evolution in this area,recording amounts of information about crustal accretion and reworking processes(De Paolo et al.,1991;Rudnick,1995;Wu et al.,2011).In view of this,this paper uses the spatial-temporal variations of trace elements and zircon Hf isotopic compositions of phanerozoic granitoids within the Khanka Massif as a case to reveal the crustal accretion and reworking processes of micro continental massifs from the orogenic belt,further to understand the formation and evolution processes and mechanisms of the global continental crust.According to the statistics of zircon U-Pb ages of granitoids in the Khanka Massif,indicate that the granitic magmatisms in the Khanka Massif have eleven peaks:492 Ma,460 Ma,445Ma,430Ma,425Ma,302Ma,287Ma,258Ma,249 Ma,216Ma and 213Ma,it can be divided into eight main stages:Late Cambrian,Middle-Late Ordovician,Middle Silurian,Late Carboniferous,EarlyPermian,Middle-Late Permian—Early Triassic,Late Triassic-Early Jurassic,Early Cretaceous.The Phanerozoic granitoids in Khanka massif are selectedinthispaperasasuiteof granodiorite-monzogranite-syenogranite.TheSi O2contents of the Phanerozoic granitoids exceed 65%,and has high Al2O3,low Mg#,TFe2O3,Cr,Co and Ni contents.This suggests that mixture with mantle-derived magma did not occur,and it should be a typical crustal source(Lu and Xu,2011).Combined with evident characteristics of light rare-earth elements(LREEs)and large ion lithophile elements(LILEs)enrichment,and heavy rare-earth elements(HREEs)and high field-strength elements(HFSEs)loss,we suggest that the primary magma was derived by partial melting of lower crustal material(Xu et al.,2009),and geochemical properties of the Phanerozoic granitoids essentially reflect the nature of the magmatic source region.According to the temporal variation of zircon Hf isotopic data of Phanerozoic granitioids,zircon Hf isotopic compositions of Phanerozoic granitoids have a obvious correlation with age.With the decrease of formation time ofthePhanerozoicgranitoids(Late Cambrian^Middle-LateOrdovician^Middle Silurian^EarlyPermian^Middle-LatePermian–Early Triassic^Late Triassic-Early Jurassic),εHf(t)values of zircons gradually increase,whereas their TDM2 ages gradually decrease(Paleoproterozoic–Neoproterozoic),suggesting that the generation of granitic magmas from the Khanka Massif could have experienced the change from the melting of the ancient crust to the juvenile crust during Paleozoic to Mesozoic.According to the sample location,it can be found thatεHf(t)values of Phanerozoic granitoids have the tendency to decrease with latitude increase,showing that components of the ancient continental crust gradually increase from south to north.However,at the same latitude range,theεHf(t)values of Phanerozoic granitoids also inconsistent.Taken together,these differences reveal the horizontal and vertical heterogeneity of the lower continental crust within the Khanka Massif.According to the relative probability of two-stage model(TDM2)ages of zircon Hf isotope from Phanerozoic granitoids within the Khanka massif,it could be divided into three stages:(1)Late Paleoproterozoic(2)Mesoproterozoic(3)Neoproterozoic.It reveals that the main part of the continental crust within the Khanka MassifwereformedinLate Paleoproterozoic–Neoproterozoic.The Phanerozoic granitoids in the Khanka Massif reworked from the source rockswithdifferent ages(Paleoproterozoic–Mesoproterozoic–Neoproterozoic).

Strength May Lie in Numbers: Intertidal Foraminifera Non-Negligible Contribution to Surface Sediment Reworking

The contribution of benthic foraminifera to sediment bioturbation has widely been overlooked despite their huge abundance in intertidal soft sediments. In this preliminary study, we specifically chose to focus on two key species of benthic foraminifera in temperate intertidal mudflats, Quinqueloculina seminula and Ammonia tepida, and first experimentally investigated their individual movements at the sediment surface. We subsequently derived from these observations the individual-level surface sediment reworking rates, and used the actual abundance of these species to extrapolate these rates at the population level. Individual surface sediment reworking rates SSRRi ranged between 0.13 and 0.32 cm2·ind-1·day-1 for Q. seminula, and between 0.12 and 0.28 cm2·ind-1·day-1 for A. tepida. Population-level surface sediment reworking rates were subsequently estimated as ranging between 11,484 and 28,710 cm2·m-2·day-1 for Q. seminula and 27,876 and 65,044 cm2·m-2·day-1 for A. tepida. Noticeably, these reworking rates are comparable to, and eventually even higher than, the rates reported in the literature for populations of intertidal macro-invertebrates, such as the annelid polychaete Melinna palmata and the bivalve Abra ovata. Taken together these results suggest that despite their minute size intertidal benthic foraminifera are, thanks to their abundance, non-negligible contributors to the reworking of surface sediment, and may then play an unanticipated role in the benthic ecosystem functioning, through e.g. the enhancement of fluxes at the sediment-water interface.

Synergic Effect of Reworking for Imperfect Quality Items with the Integration of Multi-Period Delay-in-Payment and Partial Backordering in Global Supply Chains

In intercontinental trade and economics goods are bought from a global supplier.On occasion,the expected lot may include a fraction of defective items.These imperfect items still have worth and can be sold to customers after repair.It is cost-effective and sustainable to rework such items in nearby repair workshops rather than return them.The reworked items can be returned from the workshop to the buyer when shortages are equal to the quantity of imperfect items.In the meantime,the supplier correspondingly deals a multi-period delay-in-payments strategy with purchaser.The entire profit has been maximized with paybacks for interim financing.This study aims to develop a synergic inventory model to get the most profit by making an allowance for reworking,multi-period delay-in-payments policy,and shortages.The findings of the proposed model augment inventory management performance by monitoring cycle time as well as fraction of phase with optimistic inventory for a supply chain.The results demonstrate that profit is smaller if the permitted period given by supplier to buyer is equal to or greater than the cycle time,and profit is greater if the permitted period is smaller than the cycle time.The algebraic method is engaged to make a closed system optimum solution.The mathematical experiment of this study is constructed to provide management insights and tangible practices.

A single-manufacturer multi-retailer sustainable reworking model for green and environmental sensitive demand under discrete ordering cost reduction

This paper develops an economic production quantity(EPQ)model for a singlemanufacturer multi-retailer(SMMR)production and reworking system with green and environmental sensitive customer demand.The minimum cost of the manufacturer has obtained under carbon emissions(CE)policies and discrete ordering cost reduction.The model is used to optimize the total number of shipments,greening investment level,environmental measure,and lot size for productions and rework.This research work determines that the manufacturer’s and retailer’s profits will be increased after considering the environmental and green dependent demand of customers.Further,the development of green and environmental demand is proposed to minimize the CE and maximize the demand for the customers.In the existing literature,no discrete investment is developed for reducing the cost of ordering for the retailer/buyer.However,in this paper,we have introduced it.We provide numerical examples to explain the models and determine the significance of model parameters.

Reworking of the Juvenile Crust in the Late Mesozoic in North Qinling,Central China

The Qinling Orogen resulted from the collision between the North and South China blocks in the Triassic.Mesozoic granitoids,ranging from the Triassic to the Cretaceous,are widely distributed in this orogen,and they provide excellent clues for understanding the crustal evolution and geodynamic evolution of the orogenic belt.The Triassic belt is mostly located in the South Qinling,whereas the Cretaceous belt is located mostly in the North Qinling.The Taibai complex pluton is located at the conjunction of the two belts.Here we present a data set comprising zircon U-Pb dating and elemental and Sr-Nd isotopic geochemistry for Late Mesozoic granite and microgranular enclaves(MME)exposed in the Taibai complex pluton.The granite and MME yield concordant U-Pb zircon ages of 124 to 118 Ma,indicating that they were products of roughly simultaneous magmatism in the Late Mesozoic.The granite rocks are high-K,calc-alkaline,and weakly peraluminous in compositions,and they are characterized by enrichment in large ion lithophile elements(e.g.,Rb,Ba),depletion in high field strength elements(e.g.,Nb,Ta,Zr,Ti),and variable Sr/Y ratios of 7.64 to 63.6.Low MgO,Cr,and Ni contents imply that the magma(s)were essentially crust-derived.Both the granite and the MME show relative depletion in Sr-Nd isotopic composition(initial ^(87)Sr/^(86)Sr of 0.7044 to 0.7067,initialε_(Nd) values of-3.4 to-2.6),suggesting that the magma(s)originated from juvenile crustal rocks.These Sr-Nd isotopic characteristics are significantly different from those of other Late Mesozoic granitoids exposed elsewhere in the Qinling orogenic belt,which formed from much older and enriched sources and with negligible contributions from mantle or juvenile crust.We propose a reworking event of the juvenile crust during the Late Mesozoic that was triggered by the tectonic extension and subsequent asthenospheric upwelling that occurred in eastern China.

极简主义视觉艺术和音乐在新媒体上的跨媒介互动——以App REWORK为例

20世纪六七十年代,极简主义的出场,深远影响到了许多艺术领域。极简主义视觉艺术和极简主义音乐在“少即是多”“重构与解构”“重复性”方面有着共同的美学特征,为二者的结合提供了理论基础。近年来,App REWORK从“音乐与色彩”“运动与节奏”“音乐层次与空间”三个方面,使极简主义视觉艺术与极简主义音乐实现了新媒体上的跨媒介互动,为视听跨媒介互动提供了实践依据。App REWORK为极简主义视觉艺术和音乐在新媒体上跨媒介互动体验系统提供了实践范例,为用户在新媒体视听互动创作系统提供了典范;有利于音乐的推广和提升用户的参与度,也为其他风格的视觉艺术与音乐互动提供了可能。

重矿设备嵌入式控制系统的设计与开发

分析了重型矿山行业设备的主要特点及开放式控制器的设计要求,在此基础上设计并开发了基于ReWorks实时操作系统和PC104总线嵌入式硬件平台的嵌入式控制系统,给出了系统功能、组成结构、主要模块和实现的关键技术。在对开放式控制器进行研究后,设计了适合于重矿行业通用的网络通信模块和逻辑控制模块。

嵌入式软件协同开发支撑技术

提出了一种在嵌入式软件开发过程中主机开发环境与目标机运行环境之间协同工作的支撑技术,该技术使用目标机服务器和目标机代理来构建主机和目标机的交互环境。这种模式可以使开发环境中的工具通过与目标机服务器的交互,完成与目标系统的协同工作,而不必考虑目标机的资源。该文讨论了其结构和关键技术。该技术已在华东计算技术研究所自主研制的实时嵌入式操作系统ReWorks及其开发环境ReDe中予以实现。

ReWorks嵌入式操作系统在船舶PMS上的应用

随着计算机技术的迅猛发展和船舶自动化水平的不断提高,对船舶PMS的实时性、可靠性要求也越来越高.论文介绍了船舶PMS研究现状和嵌入式操作系统的特点,构建了一种基于ReWorks嵌入式操作系统的船舶PMS,这样的系统更为安全、可靠,对于船舶自动化发展有着更为深远的意义.

嵌入式轨道交通自动检票机软件设计

介绍了轨道交通自动售检票系统组成及其应用需求,阐述了目前实现自动检票机应用的软件技术及存在的缺陷。针对这些缺陷,提出了基于国产实时嵌入式操作系统ReWorks设计自动检票机软件设计方案。针对自动检票机应用需求,介绍了ReWorks操作系统组件的定制过程及应用软件的模块设计。

矿山设备控制系统中的软PLC的设计与实现

软PLC技术是一种新型控制技术。笔者针对重矿行业的特点,在基于实时操作系统(ReWorks)开发的矿山设备控制器上,提出了软PLC的设想。本文重点分析指令表的构成及如何解释执行,并初步实现功能,给出了实例。在结尾处探讨了完善此软PLC模块的相关问题．并对后续工作做出展望。

开放式控制器的实时中间件

提出基于实时中间件的开放式控制器体系结构的框架模型。该框架充分利用中间件规范的分布式计算性能,在满足系统实时性要求的前提下,实现系统资源的互操作可重用。在给出通用控制器的基本架构的基础上,设计了基于CORBA技术的面向矿山机械的监控系统的具体方案,并进行了试验研究。

Uraniferous Black Shale and Related Uranium Mineralization Features in South China

: Black shales are marine sediments with argillaceous, silty and siliceous compositions and high contents of organic materials, disseminated pyrite and uranium. Uraniferous black shale has uranium content of more than 20 ppm.Black shales are widely distributed in 17 provinces or autonomous regions in northwestern and southern-central China. Their sedimentary ages are from the Sinian to the Tertiary and uraniferous black shales are mainly exposed in Yunnan, Guizhou, Sichuan, Hunan, Hubei, Jiangxi, and Zhejiang provinces and Guangxi Zhuang Autonomous Region and the economically significant uranium deposits associated with black shale occur in Hunan and Jiangxi provinces and Guangxi Zhuang Autonomous Region.Uranium mineralization associated with black shale has the following main features: (1) forming stratabound deposits; (2) controlled by structures such as interlayer and intersected faults and fractures; (3) associated with different ore-forming processes such as leaching and hydrothermal reworking; (4)

基于国产化计算平台的雷达数据融合软件设计与实现

本文阐述了国产化计算平台的概念及应用意义,对国产化计算平台的软、硬件的构成、技术指标以及主要特点进行详细描述;在此基础上,结合工程实际,完成了基于国产化计算平台的雷达数据融合软件设计与实现,仿真结果表明,研制的雷达数据融合软件功能和性能均满足要求,有效提升了装备软件国产化水平,具有较高的工程应用价值和军事价值。

Chemical-Abrasion U-Pb zircon geochronology reveals 150 Myr of partial melting events in the Archean crust of the São Francisco Craton

Field observations and CA-LA-ICP-MS U–Pb zircon ages and Hf isotope compositions obtained from migmatitic orthogneisses and granitoids from the Belo Horizonte Complex,southern São Francisco Craton,indicate a major period of partial melting and production of felsic rocks in the Neoarchean.Our observations show that the complex is an important site for studying partial melting processes of Archean crystalline crust.Much of the complex exposes fine-grained stromatic migmatites that are intruded by multiple leucogranitic veins and sheeted dikes.Both migmatites and leucogranite sheets are crosscut by several phases of granitoid batholiths and small granitic bodies;both of which are closely associated with the host banded gneisses.Chemical abrasion followed by detailed cathodoluminescence imaging revealed a wide variety of zircon textures that are consistent with a long-lived period of partial melting and crustal remobilization.Results of U-Pb and Hf isotopes disclose the complex as part of a much wider crustal segment,encompassing the entire southern part of the São Francisco Craton.Compilation of available U-Pb ages suggests that this crustal segment was consolidated sometime between 3000 Ma and 2900 Ma and that it experienced three main episodes of partial melting before stabilization at 2600 Ma.The partial melting episodes took place between 2750 Ma and 2600 Ma as a result of tectonic accretion and peeling off the lithospheric mantle and lower crust.This process is likely responsible for the emplacement of voluminous potassic granitoids across the entire São Francisco Craton.We believe that the partial melting of Meso-Archean crystalline crust and production of potassic granitoids are linked to a fundamental shift in the tectonics of the craton,which was also responsible for the widespread intrusion of large syenitic bodies in the northern part of the craton,and the construction of layered mafic–ultramafic intrusions to the south of the BHC.

车况检测系统中网络通信的应用

主要介绍了轨道交通车况检测系统中网络通信技术的应用,车况检测系统是轨道交通系统的重要组成部分,通过车况检测系统可以实时采集列车的车辆工况监控信息并将它及时传输给地面的车辆工况监控系统,本文阐述了在车况检测系统中网络通信的实现方法,并给出了基于Reworks嵌入式系统下的网络通信机制。

基于ReWorks平台的SD卡驱动程序设计

SD卡作为一种大容量、高性能的固体存储设备广泛应用于各类嵌入式系统。目前基于嵌入式ReWorks系统的SD卡驱动研究还比较少。为实现SD卡在ReWorks平台上的数据存取,本文以S3C2440为处理器研究了基于SD总线模式的SD卡初始化过程和读/写过程,并根据ReWorks系统关键数据结构和建立块设备的工作流程,在ReWorks系统平台上实现了的SD模式下的SD卡驱动程序。该驱动程序的结构及实现细节对ReWorks平台的块设备驱动开发以及其他系统平台的SD卡驱动开发均有一定的借鉴意义。

基于ReWorks的嵌入式电力推进控制软件

为实现船舶电力推进,通过对电力推进系统的推进状态研究,应用PC/104硬件平台和ReW orks国产嵌入式实时操作系统,设计内河小型船舶电力推进控制软件.该软件利用嵌入式实时操作系统的多任务特性和文件系统及其便捷的网络套接字划分不同的任务类型,结合本地监控软件实现集操作、监控和现场参数实时配置一体的控制软件框架.通过采集配电板、电动机和齿轮箱的现场数据,控制软件完成对推进变频器的控制.实船试验表明,该控制软件能满足电力推进船舶的实际需要,保证船舶电力推进的稳定运行.

基于ReWorks操作系统的实时多任务程序设计

实时多任务程序设计是嵌入式系统软件设计的基础。随着嵌入式系统性能的提高和功能的复杂,实时多任务程序设计会越来越复杂。简要介绍ReWorks下实时多任务程序设计机制,通过一个利用实时多任务来实现的模型,重点介绍Re-Works下实时多任务程序设计的关键技术。