Geological and Geochemical Characteristics and Genesis of the Shaxi Porphyry Copper (Gold) Deposits, Anhui Province

The Shaxi porphyry copper (gold) deposits are a typical example of porphyry copper deposits associated with diorite in eastern China. Quartz diorite, which hosts the deposits, has a Rb-Sr isochron age of 127.9 ± 1.6 Ma. Geochemically, the rock is rich in alkalis (especially sodium), light rare earth elements (LREE) and large-ion lithophile elements (LILE), and has a relatively low initial strontium isotopic ratio (Isr=0.7058); thus it is the product of differentiation of crust-mantle mixing source magma. The model of alteration and mineralization zoning is similar to the Hollister (1974) diorite model. The ore fluids have a relatively high salinity and contain significant amounts of CO2, Ca2+, Na+ and ***CI?. The homogenization temperatures of fluid inclusions for the main mineralization stage range from 280 to 420°C, the δ18O values of the ore fluids vary from 3.51 to 5.52 %, the δD values are in the range between ?82.4 and ?59.8 %, the δ34S values of sulphides vary from ?0.3 to 2.49 %, and the δ13C values of CO2 in inclusions range between ?2.66 and ?6.53 %. Isotope data indicate that the hydrothermal ore fluids and ore substances of the Shaxi porphyry copper (gold) deposits were mainly derived from magmatic systems.

^(40)Ar/^(39)Ar Dating of the Shaxi Porphyry Cu-Au Deposit in the Southern Tan-Lu Fault Zone, Anhui Province

Four samples of plagioclase and biotite from the Shaxi porphyry in the lower part of the Yangtze metallogenic belt were analyzed for age determination with the ^40 Ar/^39Ar method. The results yield reproducible ages of 126 Ma to 135 Ma with a high level of confidence according to the agreement between isochron and plateau ages. The four Ar-Ar ages are relatively consistent within the analytical error. These ages are also consistent with, but more precise than, previous K-Ar and Rb-Sr ages and thus provide better constraints on the time of porphyry formation and associated Cu-Au mineralization along the middle to lower part of the Yangtze metallogenic belt. The ages of 126 to 135 Ma are interpreted to represent the intrusive time of the Shaxi porphyry, so that the Cu-Au mineralization should have occurred later due to the post-magmatic hydrothermal event.

Study on Shaxi porphyry copper-gold deposit in Anhui:gold mineralization and occurrence determination by PIXE

Shaxi porphyry Cu-Au deposit was one of the important discoveries of the exploration in the middle-lower reaches of Yangtze River in China in 1970s. Gold occurrence in the Shaxi porphyry copper-gold deposit (central (Anhui) province, eastern China) was investigated by means of microscope analyses, EPMA and PIXE. Combined with geological and mineralogical methods, the characteristics of occurrence of gold in the large scale sulfide mineralization in this region were fully investigated. The results show that gold distributes in both chalcopyrite and pyrite as submicroscopic inclusions (less than 1 μm) . Au is positively correlated with As, Fe, S, Cu, Zn and Ti. The condition of gold transformation in thermal fluid system controlling deposition of Au in the region is probably the oxidation potential of the red sedimentary rocks of shale and fine grain sandstone which may be crucial as a geochemical barrier to the reducing fluid. This study lays foundation for the further research and exploration of the porphyry copper-gold deposit both theoretically and practically in the lower reaches of Yangtze region.

OVERVIEW OF THE DEVELOPMENT OF GARMENT INDUSTRY IN SHAXI TOWN (Part I)

Bordering Guangzhou on the north and connecting the urban area of Zhongshan city, Shaxi is located in the central south of Pearl River Delta and near to Hong Kong and Macao. It covers an area of 55 square kilometers, with population of

SHAXI:Enhance the Latitude of China Casual Dress Industry

The fever of fashion of 9th China Casual Wear Expo (CHCW 2008) will burn up in Zhongshan Expo Center from October 16 to 19.

Formation of the adakite-like granitoid complex and porphyry copper-gold deposit in Shaxi from southern Tancheng-Lujiang fault belt: A clue to the West Pacific plate subduction

On the basis of the geological and geochemical studies, including chemical analysis of bulk rocks, rare-earth and trace element studies, fluid inclusion, and S and O isotopic analyses, the authors described the geological background of the deposit in detail and presented significant proofs for the conditions of formation of the Shaxi porphyry copper-gold deposit. Compared with other large and supper-large porphyry copper deposits in China and the adjacent Cu-Au mineralized areas, the ore-forming processes and conditions were analyzed; and the possibility of forming large porphyry copper deposits in the Shaxi area was discussed. The present study indicated that the ore-forming fluid and material were mainly of magmatic origin, while meteoric water played a certain role in the ore-forming processes. Interactions between subducting and overriding plates provided a major driving force for the formation of igneous rocks and the deposition of metal elements in East China since Jurassic. Based on the geo- chemical data of the Shaxi intrusive, it is found that the copper (gold) mineralization is closely related to the genesis of adakite-like intrusive in the Shaxi area. This adakite-like intrusive was formed in the subduction environment as a result of the subduction of the West Pacific plate toward the East China continent, where there is a great potentiality to form a large porphyry copper deposit.

基于多元数据的大理沙溪古镇空间演变研究

山区历史城镇受自然和社会因素影响,往往难以平衡保护和发展的矛盾。文章选择保护实践卓有成效的云南省大理白族自治州剑川县沙溪古镇,从空间及功能2个方面对其演变的规律进行分析和归纳。首先,利用空间句法对集镇的空间形态演变特征进行分析;其次,通过核密度分析城镇功能演变特征;再次,与规划用地布局进行对照,归纳沙溪空间演变的动力机制。最后得到如下结论:1)21世纪以来,沙溪古镇的空间演变分为3个阶段特征;2)沙溪古镇的空间形态变化体现出从单核集聚到双核扩展再到城乡一体化的趋势;3)沙溪古镇的空间功能变化滞后于空间形态变化,应促进新建镇区用地功能的多样化,使功能与空间协调发展。

中江气田沙溪庙组气藏老井挖潜标准研究

中江气田沙溪组气藏老井挖潜已取得较好的开发效果与经济效益,但挖潜选井评层尚未形成标准,在一定程度上制约了老井挖潜工作的开展。通过分析前期沙溪庙气藏挖潜井特征,初步形成了老井挖潜基本方法、选井标准与评层地质标准,就目前阶段,沙溪庙气藏老井挖潜选井主要考虑单井生产经济极限、气井井况、开发地质潜力、气井工程与地面条件等四方面,挖潜评层以录井参数指标、测井电性指标、测井曲线形态为主要依据,结合地震响应特征,定量评价挖潜潜力层,保障挖潜成功率,为气田降本增产、高效开发提供重要支撑。

安徽庐江沙溪铜金矿床蚀变岩地球化学特征和金的赋存状态研究

斑岩型铜金矿床是金资源的重要来源,研究其中载金矿物(如硫化物)的种类其中的金含量是高效回收金的关键。本文通过对沙溪矿床不同类型蚀变岩和工业品位矿石开展系统的矿物学和地球化学成分研究发现,沙溪矿床中钾化蚀变更富集Si、Fe和K、贫Na,青磐岩化蚀变更富集Al和Fe、贫Ca,石英绢云母化更富集Ca和Na、贫Fe和K。矿石内主要脉石矿物为石英含量为37.65 wt%,钠长石含量为17.15 wt%,碱性长石含量为11.35wt%,白云母含量为12.87 wt%,硫化物黄铁矿和黄铜矿含量分别为1.36 wt%、1.17 wt%。金是以类质同象替换的形式存在于黄铁矿和黄铜矿中,在二者中的占比分别为5.98%、2.15%,其他类型占比为91.87%。

建筑遗产保护中的价值判断和提升途径--以黄印武的沙溪复兴工程为例

基于访谈、文本、图像及实地调研,结合兴教寺大门重建和戏台藻井修复案例,研究调查黄印武在沙溪复兴工程中的设计思想和方法,以此丰富对建筑遗产保护的理解。在沙溪复兴工程中,黄印武把遗产价值的表达和强化视作保护工作的核心目标。为了实现这一目标,他把“设计思维”引入建筑遗产保护中,以“具体问题具体分析”的方法来重新建立建筑基本要素之间新的平衡关系,并通过“价值判断”对不同的可能方案进行“择优”选择与权衡。

安徽庐江沙溪铜金矿床中金的独立矿物研究

金是重要紧缺的战略性矿产资源,斑岩型矿床是重要的矿产金来源。本研究选择安徽庐江沙溪斑岩型铜金矿床为研究对象,通过开展该矿床内矿石中金独立矿物的岩相学和成分分析,发现矿石中金的独立矿物为碲金矿、银金矿等,主要存在于石英硫化物脉中,与黄铜矿、斑铜矿、石英、磁铁矿等共生。金矿物(包括碲金矿、银金矿等)的嵌布粒度均细,大于20μm的只占5.36%,大部分都小于20μm。其中金矿物的嵌布粒度10~20μm的占有率为34.68%、5~10μm的占有率为28.51%,小于5μm的自然金的占有率为31.45%。研究发现沙溪矿床中金与铜关系密切,载金矿物主要以颗粒较小的包裹矿物产出,可作为伴生元素开采,研究结果为沙溪矿床中金的回收利用提供了一定参考依据。

以防洪为核心的三明市沙溪数字孪生流域建设

为提高三明市防洪的实时监管效能、应急处置能力与安全保障水平,以沙溪流域为例,构建了以防洪为核心的数字孪生流域。从防洪“预报、预警、预演、预案”4个方面,通过完善监测感知网建设,针对三明市沙溪流域防汛感知网的薄弱环节,适当增加水文、气象等监测设备,提升气象预测预报预警精准程度;加强数据资源建设,整合现有平台及数据资源,推动各部门间数据同步、互通共享与系统同屏共享,实现“一屏知汛”;开展重点区域建设,将沙溪流域作为重点建设区域,建设覆盖沙溪流域的立体监测体系,并重点实现沙溪流域防洪调度一体化,实现信息快速流通,支撑防汛应急指挥调度。实践证明:在数字孪生技术的支持下,通过调度预演来分析决策,三明市主城区防汛预警提前了6 h,最大限度地减少灾害影响和社会经济损失,取得了良好的运用效果。

Considerations of a Swiss Monument Preservationist during a Visit to Traditional Villages in China:The Yunnan Shaxi Rehabilitation Project as an Opportunity

The article elaborates the thoughts and recommendations from a Swiss monument preservationist view point towards the issues and developments of rural cultural landscapes in China,with case studies on the joint Swiss-Chinese Rehabilitation Project of Shaxi,and the traditional villages in the provinces of Guizhou and Guangxi.

历史视角下流域乡土聚落景观格局多尺度研究——特征与影响因素

为了深入探讨流域乡土景观的形成机制、空间分布规律以及人类活动与自然环境因素对景观格局的影响。选取了流溪河及其支流沙溪河作为研究区域,采用景观格局指数、冗余、历史景观特征评估方法等进行分析。发现在流域尺度下,聚落到水系的平均最近距离和平均高程对流溪河流域景观格局的异质性有显著影响;在子流域尺度下,农业土地制度、城镇化和乡土社会凝聚力在乡土聚落景观的塑造与演变中具有重要影响。多尺度研究揭示了地理环境与人口发展在共同塑造流域内乡土聚落景观,并且上下游地区乡土景观存在差异,需采用不同管理策略以维护完整性和可持续性。

底色——与黄印武谈乡村和遗产设计

文章是黄印武和徐好好的对谈。黄印武长期在沙溪、敦煌等地进行遗产保护和设计实践,徐好好也长期在广州、顺德等地进行相似的工作。文章基于保护建筑遗产和在遗产环境中设计的共同视角,从建筑师对乡村和乡村建筑遗产中的一些概念阐述开始,以黄印武的先锋沙溪白族书局等设计为例,讨论了建筑师在遗产设计中的基本态度和认识。

基于出力场景库的梯级水库群短期优化调度研究

随着各大流域梯级水库群的建成投运,梯级水库群短期优化调度问题的研究也越来越受到人们的关注,但该优化问题包含的变量多、约束复杂,其模型建模与求解难度随着水库群规模的扩大也越来越大。虽然传统优化方法或智能优化方法能够得到满足相关目标与约束的最优解,但往往优化算法下的结果太过于偏重目标值的大小,结果波动性、随机性大,难以满足实际调度需求。鉴于此,从历史已发生的调度结果出发,基于历史的详细调度数据,采用聚类分析等数据挖掘方法,考虑调度时期、业务类型、调度期长度、调度对象等场景要素,提出了电站出力场景构建技术,通过挖掘基于长系列历史运行数据的典型出力场景,形成出力场景库,并在此基础上提出了基于出力场景库的梯级水库群短期优化调度方法。以沙溪梯级水库群为例进行实例分析,结果表明,相比于传统优化调度方法,所提方法不仅能够得到满足实际调度要求的出力过程,而且计算时间也相对大大缩短,验证了该方法的可行性与实用性,研究成果对其他流域梯级水库群短期优化调度具有很好的参考借鉴意义。

乡村书店助力乡村文化振兴的现实逻辑与实践研究——基于云南“先锋沙溪白族书局”的考察

书店进军乡村既是现代实体书店寻求自身转型发展路径之举,也是探索乡村文化振兴途径之措。先锋团队在沙溪构建复合型经营的综合体书店,以厚实的图书资源为基础充实沙溪的精神粮仓,以独特的营运模式为推手丰盈沙溪的物质粮仓,深刻地融入乡村文化建设与乡村文化产业发展之中,助益该地重塑文化场域、发展文创产业、深化文旅融合、建构文化生态等,为书店助力乡村文化振兴积累有益实践经验。进驻乡村的书店成为乡村生活品质提高、文旅融合、乡村文化展示的平台,是推动乡村文化振兴一种新的载体与模式。

从沙溪古镇看建筑遗产修复的整体观

文章从整体观的角度出发,以世界建筑遗产云南省大理市剑川县沙溪镇复兴工程为研究对象,对建筑遗产保护与修复的方法进行探索,以期为后续类似建筑遗产修复提供借鉴。基于对遗产价值的判定,通过分析古镇现状,梳理当地建筑遗产本体与周边环境等要素的关系,从建筑遗产中的真实性、完整性、可识别性和可逆性等方面提供相应的保护和修复设计方法,总结保护经验,并提出批判思考,从而更好地使遗产修复融入历史环境,回应地域特性和历史特性。

传统村落民居自发性建造的可持续更新研究——以剑川沙溪地区民居建造为例

当前,传统村落在城市化大潮的冲击下,形成了村庄自我消解的趋势和再生重塑的诉求。从人类历史的宏观角度论述,传统村落是大量“自发性建造”民居组成的聚落集合,具有非线性和复杂性特征。就村落尺度来看,自组织是村落人居环境体系最显著的特征之一。从民居自发性建造的角度出发,以沙溪地区民居为主要研究对象,从传统民居营造到当前自建民居面临的问题对沙溪地区民居的可持续更新提出建议,探索民居地域性由自发向自觉、自省转化的途径,为沙溪地区民居新建、改建等提供理论依据。

安徽省庐江县沙溪铜矿铜泉山与凤台山矿段-410~-650米加密勘探的实践和认识

安徽铜冠(庐江)矿业有限公司沙溪铜矿建设项目是安徽铜陵有色金属集团控股有限公司“十二五”重点项目,铜陵有色矿产资源中心在以往研究沙溪铜矿床铜泉山矿段和凤台山矿段成因和矿区地质资料的基础上,对沙溪铜矿铜泉山矿段和凤台山矿段-410~-650m标高范围内开展了勘探工作,对矿区地层、构造、岩浆岩、变质蚀变作用及深部矿体赋存规律进行了较详细的研究,查明了矿体控矿条件、控岩控矿特征,并对深部找矿工作形成了一些认识。