Existing forms of REE in gold-bearing pyrite of the Jinshan gold deposit,Jiangxi Province,China

Rare earth element(REE) is widely used in various fields of geology.Study of the existing forms of REE in geological objects is a necessity for us to solve geological problems related with REE.This paper tried to make it clear the existing forms of REE in gold-bearing pyrite in Jinshan gold deposit by stepwise dissolution test with ICP-MS analysis.Results showed that content of REE in fluid-inclusions of gold-bearing pyrite was very low,which only took about 0.07%–0.70% of the ΣREE,and that of pyrite phase ...

Rare Earth Element and Trace Element Features of Gold-bearing Pyrite in the Jinshan Gold Deposit,Jiangxi Province

Jinshan gold deposit is located in northeastern Jiangxi,South China,which is related to the ductile shear zone.It has a gold reserve of more than 200 tons,with 80%of gold occurring in pyrite. The LREE of gold-bearing pyrite is as higher as 171.664 ppm on average,with relatively higher light rare earth elements（LREE;159.556 ppm） and lower HREE（12.108 ppm）.TheΣLREE/ΣHREE ratio is 12.612 and（La/Yb）_N is 11.765.These indicate that pyrite is rich in LREE.The（La/Sm）_N ratio is 3.758 and that of（Gd/Yb）_N is 1.695.These are obvious LREE fractionations.The rare earth element（REE） distribution patterns show obvious Eu anomaly with averageδEu values of 0.664,andδCe anomalies of 1.044.REE characteristics are similar to those of wall rocks（regional metamorphic rocks）,but different from those of the Dexing granodiorite porphyry and Damaoshan biotite granite.These features indicate that the ore-forming materials in the Jinshan gold deposit derived from the wall rocks, and the ore-forming fluids derived from metamorphic water.The Co/Ni ratio（average value 0.38） of pyrite suggests that the Jinshan gold deposit formed under a medium-low temperature.It is inferred from the values of high-field strength elements,LREE,Hf/Sm,Nb/La,and Th/La of the pyrite that the ore-forming fluids of the Jinshan gold deposit derived from metamorphic water with Cl〉F.

Formation Mechanism of Maceral and Mineral Compositions of the“Barkinite”Liptobiolith from the Jinshan Mine,Anhui Province,China

In order to study the accumulation mechanism of＂barkinite＂,eight Late Permian channel benches（approximately 15-cm across and 10-cm deep） were taken from the Jinshan Mine,Anhui Province,China.The samples were analyzed by microscopical and geochemical methods.The microscopical observations indicate that the occurrence modes of＂barkinite＂in this area are different from those in other areas of China.The ratios of structureless＂barkinite＂are much higher in the Jinshan Mine,probably due to the flow-water and marine influenced environments.Furthermore, vitrinite macerals also show a strong fluorescence.The vitrinite fluorescence characteristics have not been observed in the Permian＂barkinite＂coals from northern China.The composition and variation of minerals in the column section also showed that the swamps in the study area were seriously influenced by seawater in the early and late stage during the peat accumulation.

Rb-Sr Dating of Pyrite and Quartz Fluid Inclusions and Origin of Ore-forming Materials of the Jinshan Gold Deposit, Northeast Jiangxi Province, South China

The Jinshan gold deposit is located in the Northeast Jiangxi province,South China,which related to the ductile shear zone.It contains two ore types,i.e.the alteration-type ore and the goldbearing quartz vein ore.Rb-Sr age dating is applied to both gold-bearing pyrite in the alteration-type ore and fluid inclusion in the gold-bearing quartz vein to make clear the time of the gold mineralization of the Jinshan deposit.Analytical results of this study yielded that the age of the alteration-type ore bodies is about 838±110Ma,with an initial 87Sr/86Sr value of 0.7045±0.0020.However,the age of the gold-bearing quartz vein-type ore is about 379±49Ma,and the initial 87Sr/86Sr is 0.7138±0.0011.Based on the age data from this work and many previous studies,the authors consider that the Jinshan gold deposit is a product of multi-staged mineralization,which may include the Jinninian,Caledonian,Hercynian,and Yanshanian Periods.Among them,the Jinninian Period and the Hercynian Period might be the two most important ore-forming periods for Jinshan deposit.The Jinninian Period is the main stage for the formation of alteration-type ore bodies,while the Hercynian Period is the major time for ore bodies of gold-bearing quartz vein type.The initial values of the 87Sr/86Sr from this study,as well as the previous isotope and trace element studies,indicate that the ore-forming materials mainly derived from the metamorphic wall rocks,and the ore-forming fluids mainly originated from the deep metamorphic water.

Metallogenic Age and Genesis of Jinshan Gold Deposit, Jiangxi Province, China

The Jinshan gold deposit consists of gold\|bearing ultramylonite and gold\|bearing quartz vein ores. The Rb\|Sr isochron age of fluid inclusions in quartz from quartz veins is the same as that of the gold\|bearing ultramylonite, suggesting that both the types of orebodies were formed simultaneously in the Caledonian period, in the range 406-409 Ma. REE patterns and sulfur, lead, carbon, hydrogen and oxygen isotope data, as well as the composition of fluid inclusions, have shown that the ore\|forming fluids were derived from formation water, and the ore\|forming materials came from the gold\|hosted rocks. The Jinshan gold deposit occurring in a Caledonian brittle\|ductile zone in metamorphosed microclastic rocks owes its origin to Caledonian reworking processes.

Diagenesis characteristics and their influence on porosity and permeability of sandstone from Yingcheng Formation in Jinshan field

In order to understand the diagenesis and its influence on porosity and permeability of sandstones from Yingcheng Formation in Jinshan field,applying thin sections,casting and scanning electron microscope,the authors studied petrography,diagenesis,porosity and permeability of Yingcheng Formation sandstone reservoir. The results show that the reservoir of Yingcheng Formation is mainly composed of lithic arkoses. Sandstones experienced compaction,pressolution,cementation,metasomatism and dissolution. The primary pores of the sandstones are undeveloped; most of pores are the secondary pores,which are mainly intragranular dissolution pores in feldspar and debris. The compaction and cementation reduced the primary pores in sandstones,the porosity and permeability decreased; while the dissolution formed the secondary pores,resulting in the porosity and permeability increase. Due to compaction and cementation,the porosity and permeability are reduced with increasing of depth. There exists an abnormal enlargement of porosity and permeability within a depth range 2310--2450 m. In combination with analysis of petrology,the dissolution of feldspar and debris is most developed in the depth range. Therefore,compaction,cementation and dissolution are the important factors which affect the porosity and permeability of sandstones.

忻定盆地金山凸起东缘断裂展布及晚第四纪最新活动特征

通过野外地质地貌调查结合无人机航拍测量、地质雷达勘探及浅层地震勘探综合分析认为,金山凸起东缘断裂整体呈NE向展布,走向40°,北起忻口村一带,向SW经金山铺村西、前淤泥村西延伸至部落村以北,进而向SWS转折进入盆地区。经探槽开挖和年龄测试,该断裂段最新断错晚更新世早期地层。

基于因子分析法的软件企业财务风险评估——以金山办公为例

在国家积极倡导软件国产化背景下,金山办公主营的WPS作为国内唯一能与微软抗衡的产品,获得了政策加持;新冠疫情之下云办公的不断深入覆盖,更是助力了金山办公的发展。但在双重发展契机之下,也暗藏着财务风险。因此,本文以风险识别、风险评价、风险控制为路径,结合因子分析法构建金山财务风险评价模型,发现金山办公存在资金有效利用率低、“吃下游”能力弱等风险。对此提出应当通过扩大财务杠杆、转变投资策略、提高应收账款管理水平等进行风险控制的结论,以期为信息技术行业类似企业的财务风险控制提供借鉴。

乡村振兴背景下村庄自然资源适应性评价研究——以漳州市金山镇为例

在乡村振兴积极推进的背景下,我国乡村资源的独特优势和乡村发展面临的一系列挑战成为研究的焦点。深入了解乡村的自然、社会和人文资源特征,评估乡村可持续发展的本底条件及其面临的内外风险,是当前乡村问题研究的关键议题。研究在构建乡村自然资源禀赋与乡村振兴水平评价指标体系的基础上,采用综合评价及耦合分析方法对福建省漳州市南靖县金山镇村落自然资源本底现状、乡村振兴发展程度及两者间的适应性特征进行探索。结果显示,特色保护类村落的自然资源禀赋与乡村振兴水平均较高,两系统间的适应性水平均处于初级协调状态;聚集提升类村落自然资源禀赋与乡村振兴水平一般,整体适应性水平趋于勉强协调状态;拆迁撤并类村落自然资源禀赋与乡村振兴水平较差,整体适应性水平趋于濒临失调状态。基于以上结果,研究将村落分为适应性高、适应性一般、适应性较差和适应性极差4类,并对后续乡村振兴路径展开针对性讨论,旨在为自然资源开发利用与乡村振兴发展提供解决思路。

西秦岭岩浆—变质作用与金矿的成矿关系——以金山金矿为例

西秦岭成矿带以大规模的中生代区域变质地层为特征,中生代强烈的构造—岩浆活动作用使得西秦岭成矿带成矿条件优越,目前已探明大型、超大型金矿床15处、中型31处、累计探明金储量超1000 t(冯益民等,2003;曾俊杰等,2021)。甘肃金山金矿区位于西秦岭成矿带夏河—西和—凤县—黄柏塬成矿亚带,目前已探明金资源量已达24.56 t,属大型金矿床,资源潜力仍十分巨大。

上海市金山区节水型社会建设实践探析

近年来,上海市金山区始终把水资源承载力作为刚性约束,实施最严格水资源管理制度,把节水放在优先位置,聚焦农业节水、工业节水、生活节水和非常规水源利用等,深入推进节水型社会建设。本文以上海市金山区为研究区,分析节水型社会建设的主要做法,指出存在的问题,然后提出改进建议。总体来说,要加强非常规水利用,完善节水激励机制,提高全民节水意识,以水资源可持续利用支撑上海市金山区经济社会的可持续发展。

由“他本”到“此本”——钱熙泰咸丰《金山县志稿》考述

由金山钱熙泰主持、董兆熊和张文虎负责纂修的咸丰《金山县志稿》在金山县志编修链条中处于关键位置。该志现存有两个版本,分别藏于上海图书馆(上图本)和中国台湾图书馆(台湾本)。中国台湾本为清稿本;上图本为修改稿本,保留了志书编修者的修志意见,包括对书写版式的规定,志书内容的增改,篇章顺序的调整。二者是志书定稿之前形成的不同版本样态。梳理咸丰《金山县志稿》的内容,可发现志书编修者志仿史体、文简事增、主张实地采访、核查审慎等修志指导思想。同时也可以从微观视角考察修志者将“他本”汇编为“此本”的编修过程。

敦煌写本S.5648《圆形方形诗图》创作时间考论

S.5648杂诗抄写本为册子本装帧形式,杂抄佛道相关文学作品。通过诗文词句对仗对此件所抄《圆形方形诗图》进行内容破读;运用写本学考证方法,考察S.5648写本同抄内容之间的内在关系,以及“霜”字等白色事物在金山国时期文学作品中的代表性,由此推测《圆形方形诗图》的创作时间为金山国时期,其性质为带有现实意义的杂体诗作品,抄写在此卷中的时间断为癸酉年913年。通过对P.3351《十字图诗》的实际用途和抄写情境的简要判断,系联S.5648写本,推断《圆形方形诗图》的抄写者为佛寺学郎,其用途一为情感抒发,二为日常娱乐。

黄浦江上游地表水总磷污染指数和环保投入的相关性分析

“十三五期间”(2016—2020年),金山区水体污防投入和污染减排投入分别为81850、58793万元,但地表水总磷浓度总体呈波动改善,2020年全区17个市考断面中仅13个达类水标准。分别对17个市考断面的总磷污染指数与水体污防投入、污染减排投入分别进行相关性发现,水体污防投入对总磷浓度削减作用不显著,污染减排投入对总磷浓度削减有一定作用,东海港-漕泾和黄姑塘-卫八路桥断面削减作用显著。建议成立专业水质研究小组,每年对水体污防、污染减排投入对水体总磷浓度影响开展科学评估,探索其规律,为今后精准投入提供依据。

Flood Overflows Jinshan Temple (Chinese Painting)

The Chinese painting Flood Ouerflows Jinshan Temple draws its subject from a beautiful and well-known legend,The white Snake.In the tale Jinshan was an islet in the Yangtze River of yesteryear.Inorder to aave her husband kept in a temple at the top of the isle.Bai Niangzi.incarnation of the whitesnake.bravely fought Monk Fahat.She borrowed the Yangtze River’s water to overcome Jinshan Templeand force Fahai to release her husband.

G'day from Jinshan!

你也许已从本期目录中发现:一个新专栏又诞生了！Denise Noblet,一位来自澳大利亚的作家,现执教于上海金山区。她的文章感情真挚,坦诚热情,行文优美,读Denise的文章,既可学到新鲜活泼的英语,特别是散发澳大利亚“风味”的遣词造句,乃至拼写,比如本文的标题中的G’day,Denise称:“G’dayis Australian for“Good day”。We often use it instead of“hello”,同时,读者还可窥见一个外国人是从怎样的视角来认识中国。现在,越来越多莘莘学子远游到澳大利亚去留学。读者朋友,假如你有问题想问,写信或发email给本刊,本刊将择要请Denise作答。】

Learning the Hard Way in Jinshan

Denise Noblet的这篇文章有感而发,真情动人,却让人抱憾!她已经离开了上海市金山区的那所学校。回到澳大利亚。而她现在的“接班者”(另一老外)向她倾诉了内心的痛苦。这些痛苦勾起了她对往事的回忆。一个澳大利亚的教师,不远万里,来到中国,向学生传授英语知识,尽心尽力。想方设法。然而,结果并不美好!Denise Noblet在文章中披露了这样一个令人心痛的事实:Once, theywere so naughty that I stormed outside and cried while they laughed at me through the windows. 本文发人深省的一句是:This is not an indictment(本义:控告)on the students, but rather a failing of the Chinese education system.

溧阳盆地金山地区土壤地球化学特征及找矿效果

近年来江南古陆北缘陆续取得找矿突破,但其毗邻的溧阳盆地鲜有地质找矿成果报道。通过溧阳盆地矿产地质远景调查,在分析区域成矿地质特征的基础上,对1∶5万水系沉积物测量圈定的金山异常开展了1∶10000土壤地球化学测量。运用多元统计学方法,对Cu、Pb、Zn、Au、Ag、As、Bi、Hg、W、Mo、Sn 11种元素进行地球化学参数统计、聚类分析及因子分析,发现W、Pb等元素的找矿有利信息及其与热液活动相关的多阶段成矿作用。采用不同岩性分区异常下限衬值法圈定W、Pb元素地球化学异常28处,采用多因子叠加法圈定综合异常6处。以Z-03及Z-06综合异常为例,从成矿地质作用与综合异常特征角度进行评价,结果表明综合异常主要受断裂构造、中酸性岩体与灰岩接触带控制;进一步对Z-06综合异常开展槽探及钻探验证,发现了钨工业矿体及铅-锌矿脉,为区域下一步矿产勘查指明了方向。

2013—2021年上海市金山区社区居民大肠癌筛查结果分析

目的对2013—2021年上海市金山区大肠癌筛查成效进行分析,为今后改进大肠癌筛查策略提供依据。方法利用Microsoft Access 2010建立2013—2021年金山区大肠癌筛查数据库,并计算和比较不同性别、年龄组居民的初筛阳性率、肠镜检查率和肠镜检查结果。结果2013—2021年,金山区对172244例50~74周岁常住居民开展大肠癌筛查,初筛阳性率为24.28%,其中男性为25.73%,女性为23.34%,两者初筛阳性率差异有统计学意义(χ^(2)=127.145,P<0.001)。16714例初筛阳性居民接受了肠镜检查,肠镜检查率为39.97%,其中男性为40.28%,女性为39.74%,两者肠镜检查率差异无统计学意义(χ^(2)=1.258,P=0.262)。9年间,通过肠镜检查共检出大肠癌90例,检出率为0.54%,检出癌前病变2974例,检出率为17.79%,男性和女性在肠镜检查诊断结果分布上差异有统计学意义(χ^(2)=747.903,P<0.001),不同年龄组居民在肠镜检查诊断结果分布上差异也有统计学意义(χ^(2)=111.769,P<0.001)。结论金山区大肠癌筛查取得了良好成效,但需要进一步动员50~74岁居民参加筛查,不断提高肠镜检查率,增强定点医院肠镜检查和病理诊断能力。