安徽省泾县云岭金矿残坡积型金成矿特征及成矿规律探讨

云岭金矿位于安徽省泾县西部,地处扬子陆块下扬子地块南缘褶断带,金成因类型以残坡积型金为主。文章通过对其金成矿地质特征进行分析研究认为,金矿化受泥盆系五通组砂岩、石炭系黄龙组灰岩、二叠系栖霞组灰岩、北东向断裂构造、云岭花岗闪长岩体以及古地貌控制;金矿化的形成过程:早期岩浆热液形成的含金硫铁矿体受后期构造挤压破碎作用,抬升露出地表后,经氧化、风化及后期堆积作用,最终形成现今的残坡积型金矿体。     

现行个人所得税制度存在的问题及对策

个人所得税自开征以来,为扩大我国财政收入、保证社会各项事业顺利发展作出了重要贡献,但是随着我国社会主义市场经济体制的建立和完善以及各项改革的实施,现行的个人所得税制度暴露出越来越多的弊端,与经济的发展不相适应,甚至阻碍经济的发展。改革现行的个人所得税制具有必要性和迫切性。针对现行个人所得税制度不能充分体现社会公平、税率结构差异较大等六大方面的问题提出了改革所得税模式等八大方面的对策。     

安基山岩体的对流作用和结晶作用

不对称相带的安基山石英闪长玢岩—花岗闪长斑岩侵入体的形成,是浅部岩浆房内对流循环作用的结果,岩浆由顶部向下、边部向里逐渐固结成岩,成岩过程中无明显重力分离。由于岩浆体间歇性上升,早期结晶尚未固结的角闪石英闪长玢岩岩墙,晚期沿着冷却边缘裂隙定位,最后为似斑状花岗闪长岩固结。岩体具水平分带和垂直分带。斜长石的韵律环带反映了在超冷却作用或对流循环过程中发生的组分变化。     

老矿区深部资源量预测的地球化学方法——以江西九江城门山铜矿深部铜资源量预测为例

老矿区面临着提高资源保障能力和保证矿山长远发展的挑战.对其深部资源量进行预测具有重要的现实意义.以江西城门山铜矿深部铜资源量的预测为例,以富Cu地质体为资源量计算对象,通过函数拟合积分和三维地质体可视化模型,探讨用面金属量积分法和三维地质体块段法进行深部铜资源量预测的原理和具体操作流程.最后尝试利用这2种方法计算第一空间(0～-500m)和预测第二空间(-500～-1000m)的资源量.结果表明:第一空间2种方法均可行,计算结果与传统的储量计算结果十分接近;第二空间资源量预测以三维地质体块段法为宜.当铜矿体边界品位指标分别为0.3%和0.2%时.三维地质体块段法预测深部资源量为57.97×10~4t和137.58×l0~4t,深部铜资源量主要集中在似屡状含Cu黄铁矿中(I号矿体).     

A numerical study on the cumulative out‐of‐plane damage to church masonry façades due to a sequence of strong ground motions

Seismic shocks occur sometimes as a sequence, close in space and time, of destructive events of comparable intensity. In these cases, a significant portion of the damage to historical buildings can be related with the cumulated damage on structures that become progressively more vulnerable. This research investigates the specific increase of damage determined by a sequence of strong ground motions, focusing the interest on the out‐of‐plane response of 2 church masonry façades. The dynamic analyses were performed by a specific rigid body and spring model RBSM, which only accounts for out‐of‐plane damage mechanisms. Two idealized models of façade, each made of 2 different masonry bonds, have been studied by applying various sequences of recorded accelerograms. The results highlighted a complex relationship between the spectral content of the seismic shocks and the characteristics of the structures that change in the course of the loading sequence due to the development of damage. The Housner spectral intensity proved to be a reliable scalar measure of the ground motion destructiveness for these façades. Moreover, when considering a design‐consistent accelerogram that causes a relevant damage pattern, ie, with a significant elongation of the effective first period of vibration, the numerical results indicated a possible spectral intensity threshold below which the occurrence of repeated seismic shocks, both before and after the reference design shock, can be considered as irrelevant. On the other hand, a catastrophic increase of damage should be expected when this threshold is overcome.     

河台金矿床垂深及横向剖面Au及伴生微量元素地球化学特征及矿床深部评价

不少韧性剪切带金矿床已由勘探转入开采，当前生产上急需解决的问题是矿床深部矿体延深评价。对河台金矿床矿山资料进行了二次开发，并在矿床沿垂深及横向剖面进行了系统取样分析，研究了河台金矿床Au与伴生微量元素在垂深及横向剖面上的地球化学行为。结果表明，Au及伴生微量元素在垂深及横向上含量变化具有不均匀性。矿床垂深剖面Au品位自上而下升高，Ag趋向于下降，Au/Ag比值升高，大部分变化范围为0.5-4.0,0m以下为0.38-7.0。据此判断目前揭露矿体属中上部。在矿床垂深剖面Au及伴生微量元素Bi,Se和S具有自上而下高的趋势；Ag和W自160m至0m则下降，Au/Ag,S/Se和Bi/Au比值自上而下升高，这可以作为矿体延深评价及找矿地球化学的指示剂。本矿床特征元素组合为Au-Ag-Bi-S-Cu-Se-As-W。矿床横向剖面中，Au,Ag,As,S,Cu,Bi,Se和W具有升高的规律，Au/Ag,S/Se,Cu/(Pb Zn)和W/Sn比值在上述序列岩石中具有升高的规律，而W／Au,Pb/Zn和Bi/Au则下降，这可以作为本矿找矿找矿地球化学指标。根据本矿床成矿地质条件及综合Au及微量元素的地球化学特征诸因素分析，本矿床成矿物质来源于混合岩，并与基底建造具密切关系。可以认为在0m中段往深部仍有具工业价值的矿体，河台金矿可发展成为超大型金矿床。     

两个凡纳滨对虾家系体重与体长的关系

凡纳滨对虾Litopeneaus vannamei家系的培育是遗传选育种的基础,其生长特性包括生长速度、体重与体长的关系等,是家系的表型特征。报道了凡纳滨对虾2个家系的体长与体重的关系。通过回归分析,凡纳滨对虾家系1体重(W)与体长(L)的关系为:W=0.0059L3.2809(R2=0.9931);家系2体重与体长的关系为:W=0.0059L3.2974(R2=0.9940),2个家系体重与体长的关系没有明显的变化,得出凡纳滨对虾体重与体长的关系为:W=0.0059L3.2895(R2=0.9934)。     

K-Ar dating studies of Ashigawa and Tokuwa granodiorite bodies and plutonic geochronology in the South Fossa Magna, central Japan

Abstract K-Ar age studies in the Ashigawa and the southern part of the Tokuwa granodioritic bodies, which consist of the southern part of the Kofu plutonic complex, revealed that they formed between 12 and 9 Ma. Quite a narrow range of ages obtained from the Ashigawa southernmost part of the Tokuwa pluton implies that they cooled rapidly. The southern part of the Tokuwa pluton, as a whole, shows a systematic age distribution with a decrease in age to the north. Compilation of currently available plutonic ages in the South Fossa Magna suggests that the plutonic activities occurred three times in this region. Episodic activity like this could be argued in relation to the tectonic development of this region.     

利用伪归一化差异水体指数提取城镇周边

通过对归一化差异水体指数NDWI中的绿波段修正,提出了不依赖于中红外波段的伪归一化差异水体指数FNDWI（False NDWI）。使用NDWI和FNDWI分别在背景地物为城市、城郊、乡镇、村落和山区的遥感影像上进行河流水体提取,实验表明,FNDWI影像中城镇建筑用地与河流水体的可分离性较NDWI有所提升,提升率为116％～335％不等;相关性分析表明,河流宽度与可分离性提升率具有明显的负相关关系,相关系数为-0．82;分类结果显示,在城市和城郊区域,NDWI提取的水体中混杂有较多城镇建筑用地信息,而FNDWI提取的水体中基本未见混杂。总体上,FNDWI提高了2种地物的可分离性,剔除了NDWI影像混入的城镇建筑用地信息,较好地解决了NDWI城镇建筑用地与河流水体的混淆问题,尤其适用于城镇周边的细小河流。     

江西省武山铜金矿床（体）立体定量预测及靶区优选

文中概述了江西九瑞武山铜金矿床（体）地质特征，建立了块状硫化物型、矽卡岩型，斑岩型铜金矿床（体）综合信息找矿模式；运用数学地质方法着重分析研究了武山铜金矿床不同类型矿体的空间变化规律，介绍了矿床（体）立体定量预测及靶区优选的找矿预测效果