潮湿环境中稻草的防腐效果及极限拉伸性能

滨海盐渍土存在盐胀、溶陷和吸湿软化等问题,需对其进行处理。设想使用高分子材料SH胶防腐处理稻草,以防腐后的稻草加筋滨海盐渍土。为评价浸胶稻草的防腐效果及其力学性能,测试了天然和浸泡SH胶稻草的吸水率,及天然、浸水、浸胶及浸胶后再浸海水稻草的极限拉力和极限延伸率。结果表明：（1）浸胶稻草与天然稻草相比,吸水率最多可降低50%,证实防腐效果较好;（2）浸胶后,稻草的极限延伸率和极限拉力最大提高了26%和23%;（3）同是浸泡在海水中,浸胶后稻草较天然稻草,其极限延伸率和极限拉力的最大增长率为12%和11%;（4）浸胶稻草的SEM照片观察及能谱分析表明,SH胶包裹了纤维并进入到稻草的孔隙中,增强了纤维间的联结,提高了稻草的极限抗拉性能。SH胶防腐后的稻草作为加筋材料是可行的。     

珠江三角洲广从断裂东侧"西淋岗断层"成因论证

广从断裂是粤中地区一条重要的北东向基底断裂,对于该断裂在珠江三角洲隐伏段的晚第四纪活动性的认识存在分歧.针对最近在广从断裂东侧佛山市西淋岗发现的断错晚第四纪地层现象,开展了地质地貌调查、探槽揭露、第四系年代测定和浅层人工地震探测等工作.对“西淋岗断层”的几何学特征及与基岩断裂的相关性进行了探测和分析,论证了其成因.“西淋岗断层”是新生的重力滑动面,并不是晚第四纪活动断层,与地震无关.目前尚未发现广从断裂晚第四纪以来活动的地质地貌证据,因此不能说明该断裂具备发生强烈地震的构造能力.     

江西武山花岗闪长斑岩中黑云母成分特征及其成岩成矿意义

江西武山花岗闪长斑岩与矽卡岩铜矿在成因上密切相关,通过对其中的黑云母进行的岩相学观察和详细的矿物化学分析来探讨黑云母的形成条件及其成岩成矿意义。电子探针分析结果表明,武山花岗闪长斑岩中的黑云母富镁贫铁低铝高钛,属镁质黑云母。其AlⅥ为0.03~0.19,w(ΣFeO)/w(ΣFeO+MgO)为0.531~0.567,w(MgO)为12.80%~14.06%,指示武山花岗闪长斑岩属壳幔混源的I型花岗岩。黑云母结晶的温度为720℃~750℃,logfO2为-11.6~-12.5,压力为86 MPa~103 MPa,对应的侵位深度为2.84 km~3.39 km,表明该岩体形成于相对高温较浅环境,具有较大成矿潜力,有利于武山铜矿的形成。     

Geological characteristics of the Sizhuang gold deposit in the region of Jiaodong, Shandong Province——A study on tectono-geochemical ore prospecting of ore deposits

Tectono-geochemical samples were systematically collected from 5 drillcores along the No. 304 explora-tion line and at the -310 m level under the pit in the mining area, totalling 705 samples from the metamorphic rocks, granites, altered rocks and orebodies, and were determined for their contents of 20 kinds of elements including Au, Ag, As, Sb, Hg, Cu,,Pb, Zn, Sn, Bi, Mo, Co, Ni, Mn, Cr, V, Ti, Ba, Rb, Sr, etc. By using the Surfer software the geochemical exploration line profile maps for the 20 kinds of elements and the curves for the element geochemical contents of individual ore vein groups were established. In conbination with the geochemical map analytical method and Gregorian’s zoning index calculation method, the vertical, longitudinal and lateral zonation sequences of the elements were ascertained and the geochemical three-dimentional zonation model of the primary halos was estab-lished on the basis of the analysis of metallogenic structures and alteration zonation. Coupled with the results of analysis of the geology and geochemistry data, it may be concluded that the process of alteration of granites in the mining area is also accompanied with the process of gold enrichment and mineralization. With the intensification of alteration of granites from granite →potash feldspathization granite →sericite-quartz alteration granite, seric-ite-quartz rocks →beresitized granite, pyrite sericite-quartz rock, silicified granite →gold ore, the contents of thio-phile ore-forming elements such as Au, Ag, As, Cu, Bi, Mo, Pb, Sb, Hg, and Sn tended to increase. Factor analysis of trace elements indicated: factor F2 (Au, Ag, Cu, Sn, As) represents the element association brought in at the main stage of hydrothermal metallogenesis; factor F4 (Bi, Sb) and factor F5 (Pb, Zn) represent the ore-forming element association supperposed during the late stage of Au-bearing sulfides. By using the Gregorian’s zoning index and map analysis method we have ascertained the primary halo axial zonation sequence (form frontal halo →tail halo): Pb, Zn, Mn, Ba, Sr, Rb, As, Sb, Ag, Cu, Sn, Mo, Au, Bi, Hg, Ti, Cr, V, Ni, and Co. The geochemical anomalies in the mining area display a tendency of lateral plunging to WS, which is consistent with the lateral plunging of orebodies and mineralization alteration zone. Comprehensive analysis of the results of investigations on ore-controlling structures, mineralization-alteration zonation and geochemical zonation of the primary halos indicates that the gold orebodies in this area are still of greater extension.     

内蒙古平安地元古代构造混杂岩的发现与地质意义

正研究区位于内蒙古东部天山镇西平安地地区,古生代大地构造位置由南向北可划分为华北板块、白乃庙岛弧和索伦—林西缝合带(图1)。Xiao等(2015)和Jian等(2012)等认为温都尔庙—柯丹山—西拉木伦蛇绿混杂岩带是华北板块和西伯利亚板块的缝合带,研究区则位于该混杂岩带以南白乃庙岛弧一侧。     

鄂尔多斯盆地及周缘地区下二叠统沉积特征*

通过大量的野外剖面观察和盆地内钻井岩心的详细描述,综合测井资料,从岩石类型、结构、沉积构造、古生物化石及测井曲线响应特征等方面对鄂尔多斯盆地及周缘地区下二叠统太原组和山西组沉积相特征进行了全面分析研究。结果表明,太原组主要发育陆棚、海岸、冲积扇和三角洲等沉积相,海岸沉积相包括障壁岛、潟湖和潮坪沉积,三角洲沉积相可划分为三角洲平原、三角洲前缘和前三角洲沉积。山西组主要发育冲积扇、河流、曲流河三角洲、湖泊和海岸沉积相,其中河流沉积相包括辫状河和曲流河沉积,曲流河三角洲沉积相可划分为曲流河三角洲平原、曲流河三角洲前缘和前三角洲沉积,而湖泊沉积相以浅湖沉积为主,海岸沉积主要为潟湖沉积。太原期,海相沉积占主导,主要分布于银川—榆林北部一线以南广大地区,并且从东西两侧至中部地区由浅海陆棚沉积和滨浅海过渡为潟湖沉积和潮坪沉积,其间发育障壁岛。盆地西北缘发育冲积扇和扇三角洲沉积,北部广大地区以三角洲沉积为主,自北向南依次为三角洲平原和三角洲前缘沉积。山西期,海水从盆地东南部退却,整体演变为海陆过渡相沉积,盆地北部乌达—杭锦旗—鄂尔多斯一线发育冲积扇沉积,向南至靖边一带依次发育辫状河和曲流河沉积,靖边以南至延安以北地区以三角洲平原沉积为主,向南至同心—庆阳一线发育三角洲前缘沉积,盆地南部彭阳—泾阳地区主要为浅湖沉积,再向南发育物源来自南部的三角洲沉积,在东南部武乡—义马一带为潟湖沉积。     

北祁连西段肃南地区下志留统肮脏沟组河流相的发现及其大地构造意义

北祁连地区位于中国中央造山带中段,具有典型造山带的特征.区内志留系肮脏沟组沉积环境存在较大争议,以致对其沉积期古地理格局的认识就存在很大差异.本研究选取志留系肮脏沟组发育齐全的肃南地区老虎沟剖面为研究对象,通过野外剖面实测、室内薄片鉴定和碎屑岩粒度分析等方法对老虎沟剖面肮脏沟组沉积充填序列、沉积构造和沉积相类型进行了细...     

安徽大别山团岭花岗岩体岩石学特征及成因

团岭花岗岩体侵位于大别山南部超高压变质带变质表壳岩中, 由细粒少斑二长花岗岩和中粒少斑二长花岗岩组成。通过岩石学、岩石化学、地球化学的研究, 确定其为Ｓ 型花岗岩, 源岩可能来自大别山变质杂岩。结合同位素资料, 认为其属燕山期花岗岩, 侵位机制为底辟式强力就位。     

粉煤灰土壤及所产蔬菜的有害元素含量变化和环境意义

利用南京第二热电厂湿排的粉煤灰,进行了改良蔬菜土壤的试验,并对试验用的粉煤灰、不同施灰量的土壤及所产蔬菜共３８ 个样品的有害元素和放射性元素含量进行了系统的测定。结果表明：这些元素在土壤中的含量与粉煤灰施用量无明显相关性;在本次试验范围内施用粉煤灰没有造成土壤的污染;其所产蔬菜的这些元素含量也均低于国家卫生标准限值,食用是安全的。