Lower Triassic and Induan-Olenekian Boundary in Chaohu, Anhui Province, South China

Since the West Pingdingshan Section in Chaohu was proposed as the candidate of the Global Stratotype Section and Point of the Induan-Olenekian boundary in 2003, the Lower Triassic of Chaohu has been extensively studied. Based on the studies on the Lower Triassic of Chaohu, (1) a continuous conodont zonation is established, which has become an important reference for Lower Triassic stratigraphic correlation over the world; (2) the First Appearance Datum of conodont Neospathodus waageni was suggested and has been basically accepted as the primary marker to define the InduanOienekian boundary; (3) a characteristic Lower Triassic excursion of carbon isotopes was brought to light and has been proven to be not only an excellent index for the stratigraphic correlation but also a unique indication for the perturbation of ecological environments in the aftermath of the end-Permian mass extinction; (4) a magnetostratigraphic sequence is constituted with a certain biostratigraphic control in the low-latitude region and it presents an important correlation to the Boreal sequence; (5) a cyclostratigraphic study provides an alternative method to constrain the age of the chronostratigraphic units; and (6) a scheme of the Olenekian subdivision is recently suggested to define the boundary between the Smithian and Spathian Substages. In addition, Chaohu is also the type locality of the Chaohuan Stage, the upper stage of the Lower Triassic in the China Chronostratigraphic System.Thus, the Lower Triassic of Chaohu is not only a classic sequence in South China, but also a key reference sequence to the investigation of the corresponding stratigraphy and geological events over the world. The recent achievements are viewed here for an overall understanding of the sequence. Then the current situation of the Induan-Olenekian and Smithian-Spathian boundaries is discussed to provide a reference for later works.     

Geochemical Characteristics of Sedimentary Manganese Deposit of Guichi, Anhui Province, China

The sedimentary manganese deposits occurring in Gufeng formation of the Permian in Guichi area, south Anhui Province, include manganese carbonate deposit formed by sedimentation, and manganese oxide deposit made by later oxidation. The total REE contents of these samples are relatively low ( ＜ 250 × 10-6), belonging to LREE-enriched type,showing LREE enrichment during the process of formation of Mn deposit, especially during Mn-oxidizing process. Three normalized REE patterns and SCNA-normalized trace elements spider diagrams of the Mn-bearing sequence rocks and ores in this area reflect their same origin of ore sources, which is similar to rock-forming and ore-forming conditions. The Mnforming materials primarily came from the continent with higher mature degree and single material source. The δEu and δCe negative anomaly and Ce anomaly ( ＜ - 0.1 ) manifest that Mn-bearing sequence of the Permian was mostly formed in marine basin and oxidative environment. The Sr and Ba anomaly, Sr/Ba and Co/Ni values reflect the Mn deposit environment was of deep water and high-salinity of marine facies. Although the Ce/La (mean 1.05), Y/Ho (25 ～ 41.5) and trace metals show a variety of correlations with Mn in the ten rock samples, which show multiple sources for the manganese, the analysis of geochemical characteristics indicate that the material sources of Mn deposit have been primarily terrestrially derived. Another source of the manganese probably comes from the seafloor volcanism in this area. Analysis of sedimentary features and geohistoric evolvement reveals that the maximum transgression of the Qixia Period, ore district is then in deep shelf-basin sedimentary setting and the Mn-bearing sequence is deposited.     

Rare earth element geochemistry of groundwaters from coal bearing aquifer in Renlou coal mine, northern Anhui Province, China

Rare earth element (REE) concentrations of two different types of groundwaters (high SO42–water-SW and high alkaline waterCW) from coal bearing aquifer (–400~–280 m) in Renlou coal mine,northern Anhui Province,China were measured.The results indicated that they had different REE characteristics: the total concentrations of REEs (ΣREE) of SW were lower than those of CW in general although they all had heavy REEs enriched relative to light REEs.The dissolved REE inorganic species of SW included Ln3+,LnCO3+,LnSO4+,Ln(CO3)2– and Ln(SO4)2–,whereas the CW are Ln(CO3)2– and LnCO3+ dominant,and the proportions of Ln(CO3)2– increased while other species decreased with pH increasing.Combined with correlation analysis,the enrichment and fractionation of SW (low alkaline water) were considered to be affected by alkaline concentrations via affecting the types and proportions of REE inorganic species.However,the effect of alkaline concentrations to the enrichment and fractionation of REEs of CW (high alkaline water) was less important than total dissolved solids and pH,which reflected the contribution from different rocks they flowed over,different degrees of water-rock interactions and/or REE solid-liquid partition coefficients.     

安徽枞阳祖家墩遗址炉渣的科技研究

枞阳地区以其特殊的地理位置、丰富的铜矿资源和众多的古代矿冶遗址,成为探索安徽青铜时代冶金技术发展的重要地区。采用XRD、SEM-EDS等方法对该地区祖家墩遗址出土炉渣进行检测分析和研究。结果表明,祖家墩遗址出土炉渣均为冶炼渣。通过铜硫比和周围矿山开采情况,推测该遗址所使用矿石更可能为硫化铜矿石。根据炉渣中夹杂的金属颗粒判断,祖家墩遗址可能同时存在红铜和砷铜两种冶炼活动,其砷铜不排除是使用氧化矿与含砷硫化矿石共熔还原而成,砷料来源应与铜陵当地多金属矿床有关。     

安徽蒙城尉迟寺遗址大口尊古陶器的稀土元素地球化学研究

利用岩相鉴定分析及等离子体发射光谱（ＩＣＰ）,对安徽蒙城尉迟寺遗址出土的大汶口文化大口尊陶器的矿物稀土元素地球化学及微结构等进行了分析研究。讨论了大口尊古陶器的稀土元素分布特征。进而探讨了该遗址出土大口尊陶器的产地及古文化交流概况。     

A New Hadrosauriform Dinosaur from the Early Cretaceous of Gansu Province, China

A new basal hadrosauriform dinosaur, Xuwulong yueluni gen. et sp. nov., is reported based on an articulated specimen including a complete cranium, almost complete axial skeleton, and complete left pelvic girdle. The specimen is recovered from the Early Cretaceous Yujingzi Basin in the Jiuquan area, Gansu Province of northwestern China. Xuwulong is among the most basal members of badrosauriform dinosaurs, and distinguisbed by its unique lower jaw in having a V-sbaped rostral end of the dentary in lateral view and a mandibular articular surface which levels with mid-height of the dentary ramus, as well as an enlarged and downturned prepubic process. Including Xuwulong, three basal hadrosauriforms have been discovered from the Early Cretaceous Xinminpu Group in the Mazongshan area, making it an important area to study the origin and early evolution of duck-billed dinosaurs.     

黑龙江黑河三道湾子金矿床地球物理特征分析

三道湾子金矿是黑龙江省近年来发现的中型火山热液型岩金矿床，文中通过对区域地球物理特征及矿床地球物理特征的分析，并综合矿床地质特征，运用物探方法找矿，在该区取得了显著的找矿效果。     

安徽巢湖苏家湾铜金矿床地质特征及找矿方向

苏家湾铜金矿床位于长江中下游Cu-Au-S-Fe成矿带滁县-庐江Cu-Au成矿亚带,其成因类型为矽卡岩-斑岩型铜金矿床。矿体总体呈囊状、透镜状,厚度、品位变化较大,受山里陈岩体两个不同岩性单元控制。其中,矽卡岩型铜金矿体主要赋存于闪长玢岩与震旦系碳酸盐地层内接触带,斑岩型金矿体主要产于花岗闪长斑岩体内部。本文全面系统总结了苏家湾铜金矿床矿区地质特征、矿化分布规律及围岩蚀变特征。并结合区域成矿地质背景分析,提出了矿床控矿因素和找矿标志,指明了找矿方向。     

安徽省循环经济立法初探

当前,安徽省循环经济法制建设与全省循环经济的实践具有不适应性.结合安徽省省情着手进行地方循环经济立法已经迫在眉睫.安徽省循环经济立法,可以对我省具有特色的发展循环经济的实践、创新的制度进行规范,促进我省循环经济沿着法制轨道向前推进.     

安徽省湖泊富营养化现状调查与评价

对安徽省境内17个湖泊的水质状况和沉积物营养盐水平进行调查与评价.水质评价结果表明,1个湖泊为Ⅴ类水,16个湖泊为Ⅵ类水;富营养化评价结果表明,2个湖泊为中营养,14个湖泊为轻度富营养化,1个湖泊为中度富营养化.     

安徽安庆地区早期采矿与冶金遗址考察研究

安庆地区早期矿冶遗址考察工作收获颇丰,新发现矿冶遗址20余处。科学分析显示,安庆地区早期合金体系有两种,分别为锡青铜和砷青铜,生产工序推测为先冶炼红铜,再添加锡料、砷料。铜、砷料推测来自当地,锡可能产自江西。安庆地区青铜冶金面貌具有地域性技术特征,相关工作是构筑皖西南早期冶金技术以及青铜文明的重要环节。安庆地区早期矿冶遗址考察研究更为重要的考古学意义在于将长江中下游的鄂东南、赣北、皖西南、皖南四大商周时期矿冶遗址群串联在一起。     

安徽省芜湖市龙塘沿矿区水文地质特征探讨

安徽省矿产资源丰富多样,本次研究芜湖市龙塘沿矿区属顶底板直接进水,矿坑预测涌水量达94402.6m^3/d,矿区水文地质条件复杂。通过对搜集以往水文地质资料以及现阶段施工工程揭露的水文地质数据进行统计,并对其进行综合分析,为后续矿山生产及地质灾害防治工作提供参考依据。     

安徽省南部金、多金属成矿地质特征及找矿方向

安徽省南部是我国伴生金矿的重要产区,已探明的岩金储量110 t,伴生金240 t,铜陵地区占60%.长江中下游伴生金成矿带主要位于安徽境内,该矿带伴生金储量占全国伴生金储量的63%,已发现伴生金矿床50多处,岩金矿床多处.总结和分析该区的成矿控制条件,探讨下一步找矿方向.     

中西部地区农民工返乡创业支持体系研究——以安徽省阜阳市为例

受2008年金融危机及我国沿海地区产业结构调整的影响,中西部地区农民工纷纷返乡创业,成为推动欠发达地区县城经济发展的重要力量.在分析农民工返乡创业支持体系影响因素的基础上,通过对中西部地区农民工创业现状的调查,结合Logistic回归模型,针对研究结论,提出了从政策环境、创业培训、金融服务、风险预警等方面促进中西部地区农民工返乡创业更好更快发展.     

Description and Phylogenetic Position of Dinosaur Eggshells from the Luanchuan Area of Western Henan Province, China

Here, we examine 145 dinosaur eggshells from a new fossil locality in the Qiupa Formation (Upper Cretaceous) of the Luanchuan area in western Henan Province, China. The eggshells display elongatoolithid macro- and microstructures, including ridges and nodes on the outer surface, two ultrastrncturai layers, and an undulatory boundary between the mammiilary and continuous layers.A phylogenic analysis shows that the Luanchuan eggshells belong to the ooclade Eiongatoolithidae.Within Elongatoolithidae, the thickness ratio of the mammillary layer to the entire eggshell, and the porosity of the Luanchuan eggshells are comparable to the oogenera Macroolithus and Elongatoolithus. There is no direct evidence for the taxonomic identity of the Luanchuan eggshells;however, they were likely laid by oviraptorids based on their phyiogenetic position and their similarities with known oviraptorid eggs.     

皖北灵璧地区新元古代灰岩的稀土元素特征

对皖北灵璧地区新元古代九顶山组、张渠组和望山组灰岩进行了系统的岩石学和稀土元素分析,并对古海水的稀土配分模式进行了反演,结果表明,灰岩主要由方解石组成,含有少量的黄铁矿颗粒和有机质。其稀土含量很低(平均为10.38×10-6),且轻重稀土分异明显,并具有微弱的负Ce异常和中等的负Eu异常。反演的古海水与灰岩稀土元素特征相似,但稀土总量明显偏低。灰岩和古海水较高的Y/Ho值反映受陆源物质的影响微弱,而Ce负异常较弱指示海水属于弱的氧化环境,形成水深小于200m。结合北美页岩标准化Eu异常值及前人研究成果认为,皖北新元古代灰岩是正常海水受热液改造后沉积形成的。     

安徽褐铁矿的磁化焙烧-磁选工艺

针对安徽某低品位褐铁矿石,采用磁化焙烧-磁选工艺进行了实验研究,对该矿的原矿进行了岩相分析,并对磁化焙烧-磁选工艺参数进行了优化.结果表明,该矿属低磷硫的低品位褐铁矿,褐铁矿与脉石矿物的镶嵌关系较为复杂,结晶水含量高,属难选矿石.对铁品位48.01%的原矿,在850℃、内配煤5%(质量分数)的条件下,磁化焙烧15min,焙烧矿磁化率达到最佳值,褐铁矿几乎全部转化为磁铁矿,这由X射线衍射结果证实.该褐铁矿通过磁化焙烧-磁选工艺可获得品位62.94%、回收率87.99%的铁精矿.     

Dental caries in the deciduous teeth of the children from Gulbarga, Karnataka

A cross-sectional dental examination of 1,560 randomly selected unrelated children of Gulbarga, Karnataka has shown about 30% of the children with deciduous teeth suffering from one or more carious teeth. The proportion of male children with df teeth was larger than female ones; the difference between the two being statistically significant (chi 12 = 8.0387). Its incidence was higher in children of low income group. Muslims (36.2%) were found to be affected more than Hindus (29.6%) and Christians (27.8%). An increase in the frequency of carious children was observed with the increasing age excepting the children aged 12 years and above who have shown a decreasing trend. In both the sexes mandibular teeth were found more susceptible than maxillary ones. No side difference was found in either jaw. Lower second molars were affected more, followed by lower first and upper second molars. Toothwise prevalence of caries by age showed no consistent trend either in maxilla or mandible.     

安徽某铅锌多金属矿床伴生金银赋存状态研究

矿石结构构造、矿物组成、矿物间的嵌布关系等较复杂。金矿物主要为银金矿,载体矿物以黄铁矿为主,金在硫化物中占近85％,粒间金及裂隙金占53％,微细粒,成色为660‰。银矿物主要以硫铜银矿、自然银以及以类质同象的形式存在于黝铜矿中,以中细粒为主。