胶东郭城地区脉岩类岩石地球化学特征及成岩构造背景

胶东海阳郭城地区高密度、高频率产出多种脉岩类岩石,主要包括辉绿岩(βμ)、煌斑岩(χ)、闪长岩(δ)、闪长玢岩(δμ)、花岗斑岩(νπ)、正长斑岩(ξπ)等,且脉岩与金矿密切伴生。为了探讨该区脉岩的成因、源区性质及成岩构造背景,本文通过岩石学和地球化学研究表明,该区脉岩总体属于钾质钙碱性系列,高Mg、Fe、Al,低Ti,来自深部同一岩浆源区,富集LILE和LREE,相对亏损HFSE,为弥散状角闪石相橄榄岩富集地幔部分熔融作用(9.52%)的产物。成岩过程中岩浆经历了橄榄石、单斜辉石、角闪石等暗色矿物以及少量斜长石的分离结晶作用,岩浆侵位过程中没有受到地壳物质的混染。脉岩形成于大陆板内环境,同时具有大陆弧钙碱性玄武岩的地球化学特征,暗示了在构造背景上与太平洋板块的俯冲作用及晚侏罗世至早白垩世华北地块岩石圈的区域性伸展—减薄机制有关,可能与郯庐断裂带在该时期的左行走滑引张关系更为密切。     

天然矿物材料在废水处理中的应用

利用天然矿物进行废水处理优势明显。当前,层状(粘土矿物)、架状(沸石)、链状(硅灰石)、岛状(电气石)硅盐酸矿物及锰的氧化物、氢氧化物和铁的硫化物在废水处理方面已有许多研究成果和成功应用的实例,其发展前景广阔。今后,有关金属矿的矿物学特征及其在环境净化中的应用、天然矿物应用条件和再生条件的研究工作应进一步加强。     

宜昌老林沟石榴石矿床地质特征

老林沟石榴石矿产于黄陵背斜北部类孔兹岩系中一套富铝铁质正常沉积的泥质粉砂岩、泥质岩中,在区域热动力变质作用下,铁铝榴石与夕线石共生,属于巴罗变质系列中夕线石带产物,根据矿物共生组合、指相特征矿物得出形成该矿产的区域变质的温压条件为:t为7 00℃,P为7 30MPa,变质相属低角闪岩相至高角闪岩相。     

Structural Evidence for the in-situ Origin of the HP and UHP Eclogites in the Dabie-Sulu Orogenic Belt

Whether the HP and UHP metamorphic rocks of the Dabie-Sulu orogenic belt are of an "in-situ" or "foreign" origin is a long-standing dispute among geologists. Eclogites preserved today in the HP and UHP units constitute merely 5-10%, which are not isolated exotic bodies tectonically intruding into amphibolite facies gneiss, but remnants of once pervasive or widespread eclogite-facies terranes or slabs. The present spatial distribution and forms of the eclogites have resulted from polyphase and progressive deformation and strain partitioning of the HP and UHP slabs. From their formation in deep mantle to their exhumation to the surface, the eclogites have experienced long-term deformation with different strain regimes. The dominant regime responsible for the present spatial distribution and forms of the eclogites is the shear process. The deformation patterns of the eclogites and gneiss matrix also clearly show that the eclogites were metamorphosed in situ. The original distribution area of the eclogites     

Removal of Cadmium Ions from Aqueous Solution by Silicate-incorporated Hydroxyapatite

This article reports a preliminary research on silicate-incorporated hydroxyapatite as a new environmental mineral used to remove cadmium ions from aqueous solutions. The silicate-incorporated hydroxyapatite was prepared by coprecipitation and calcining, and silicate was incorporated into the crystal lattice of hydroxyapatite by partial substitution of phosphate. The amount of cadmium ions removed by silicate-incorporated hydroxyapatite was significantly elevated, which was 76% higher than that of pure hydroxyapatite. But the sorption behavior of cadmium ions on silicate-incorporated hydroxyapatite was similar to that of pure hydroxyapatite. Morphological study revealed that silicate incorporation confined the crystal growth and increased the specific surface area of hydroxyapatite, which were in favor of enhancing the cadmium ion sorption capacity of the samples. Incorporation of silicate into hydroxyapatite seems to be an effective approach to improve the environmental property of hydroxyapatite on removal of aqueous cadmium ions.     

Diagenetic and Mineralization Age of the Hehuaping Tin-polymetallic Orefield, Hunan Province

The Hehuaping tin deposit is a large deposit found in recent years during geological surveys. The discovered tin deposit includes not only rock-alteration type deposits in fault zones, but also deposits developed in interstratified rupture zones between Devonian carbonate rocks (Qiziqiao Formation) and sandstone (Tiaomajian Formation). The finding of tin deposits of the latter type has greatly enriched tin-mineralization types in the famous Nanling polymetallic metallogenetic region and may provide us with a new potential orientation for prospecting of tin deposits in the region. It is commonly believed that the forming of the tin deposits in the Nanling region should be related to the Yanshanian instead of Indosinian granitic magmatism. Systematical zircon U-Pb SHRIMP dating in this paper shows that tin mineralizations have endured at least two stages. The early stage should be related to the intrusion of the main body of the Wangxianling granite, which was emplaced during the Indosinian period with a diagenetic and mineralized age of 224.0±1.9 Ma (MSWD=0.54), and the late stage should be related to the intrusion of Yanshanian granitic porphyry that took place after 142±3 Ma (MSWD=0.5).     

湘西北杨家坪寒武纪层序地层

湘西北杨家坪地区在寒武纪时位于扬子地台边缘,主要发育一套碳酸盐岩沉积,其沉积环境经历了从滞流盆地、台前斜坡至台地,且盐度不断增高的过程。根据露头层序地层学原理与方法,首次将该区寒武系划分为４个Ⅰ型层序,各层序的低水位体系域发育较全,且均可在扬子地区进行追踪对比,并阐述了各层序的对应层位、组成和其形成的沉积动力学机制以及海平面变化对沉积过程、生物迁移和环境的控制作用。认为研究区寒武纪存在４个海平面变化旋回,第一个旋回发生于梅树村期至沧浪铺期初期;第二旋回为沧浪铺期早期至龙王庙期中期;第三旋回为龙王庙期晚期至徐庄期早期;第四旋回为徐庄期中期至寒武纪末期,并识别出３个平衡型碳酸盐沉积体系。含油性分析表明,层序Ⅰ的海进体系域、高水位体系域和层序２的低水位体系域为有利的生油层段;层序２、层序３和层序４的海进体系域及高水位体系域为有利的储集层段。     

64层螺旋CT对穿孔及非穿孔性阑尾炎的诊断价值

目的：探讨穿孔性和非穿孔性阑尾炎的CT表现,评估CT对其诊断价值。方法：选择经临床证实的24例阑尾炎,根据病理结果将这些病例分为2组：穿孔性阑尾炎组（10例）和非穿孔性阑尾炎组（14例）。分析其CT征象并进行比较。结果：阑尾周围蜂窝组织炎、阑尾壁不连续和阑尾周围积气是穿孔性阑尾炎的直接CT征象,对穿孔性阑尾炎的诊断有很...     

磷酸铝结合剂改性绿松石的结构特征

疏松绿松石经磷酸铝结合剂浸胶充填处理后,宝石学参数、力学和工艺性质均得到明显改善,与天然绿松石相仿.为查明这类改性绿松石的结构和探讨磷酸铝无机结合剂对绿松石的改善机理,采用环境扫描显微镜(ESEM)、差热分析(TG-DSC)、红外吸收光谱(IR)和X射线粉晶衍射分析方法(XRD),对此类浸胶充填处理后的绿松石结构、物相及热性质等特征进行了研究.结果显示充填入的磷酸铝结合剂呈凝胶状分布在绿松石微孔隙间,处理后绿松石的分子结构和矿物组构与处理前一致,但产生了一定程度的非晶质化,与磷酸铝结合剂的填充作用有关,即磷酸铝结合剂在固化过程中生成氢,结合形成无机网络高分子结构;处理后绿松石的热反应温度较处理前普遍有所降低,主要是由于添加入的磷酸铝结合剂具有较低的吸热反应温度所致.