湘西南石英脉型金矿矿物流体包裹体pH值和Eh值的估算

以湘西南石英脉型金矿床为例,研究ｐ Ｈ、Ｅｈ 估算值的结果表明利用围岩蚀变反应方程以及采用碱金属离子、卤素元素离子估算ｐＨ 值是不完善的。本文根据热力学原则（ 相平衡、电价中和） 提出了矿物流体包裹体成分体系计算ｐＨ 估算值的方法,并且讨论了测试包裹体时气体成分外逸是影响ｐＨ 和Ｅｈ 估算值的主要因素之一。     

Oxygen isotope compositions of quartz grains (4–16 μm) from Chinese eolian deposits and their implications for provenance

Oxygen isotope compositions were measured in quartz grains extracted from a 7.0 Ma red clay-loess sequence at Lingtai and six late Pleistocene loess sediments (Malan loess). Results show that the changes in oxygen isotope compositions of Malan loess are basically controlled by the geochemical characteristics of the source materials, while the effect of weathering process after dust deposition could be minor. The oxygen isotope distribution of quartz grains from red clay at Lingtai is similar to that of the overlying loess-paleosol sequence, thus indicating that the red clay at Lingtai has the same eolian origin as the loess-paleosol deposits. Furthermore, the oscillations of the isotope compositions in 4–16 μm-sized quartz grains may reflect the changes, to some extent, of the climatic systems of the source region.     

东天山大盐池西闪长岩锆石SHRIMP U-Pb测年——对伴生超基性岩时代下限的制约

大盐池西超基性岩一直缺乏可靠的年龄资料,因此时代厘定一直存在疑问.该超基性岩侵入于一个闪长岩体中,1∶5万区域地质矿产调查获得该闪长岩的年龄为303Ma±15Ma.这表明该超基性岩形成于晚石炭世以后.     

高纯球形-准球形亚微米晶质SiO2材料的制备与表征

以天然粉石英为基本原料,通过氢氟酸与盐酸混合酸溶蚀技术和机械强力搅拌处理,制备了高纯球形-准球形亚微米晶质SiO2材料。XRD,SEM表征结果表明,制备的高纯球形亚微米晶质SiO2材料为纯结晶SiO2相,粒子呈球形-准球形,球化-准球化率达80%～90%,粒径一般为300 nm～800 nm;其化学组成为:w(SiO2)99.90%,w(Al2O3)192×10-6,w(Fe2O3)33×10-6,w(Mg)1×10-6,w(Ca)2×10-6,w(Cl-)20×10-6。     

Chronology of an oyster reef on the coast of Bohai Bay, China: Constraints from optical dating using different luminescence signals from fine quartz and polymineral fine grains of coastal sediments

Fossil oyster reefs are indicators of past sea levels, and their formation is usually dated by means of radiocarbon. However, radiocarbon dating of the shells from coastal areas may be complicated by the varying sources of carbon. Here we applied optical dating methods to date the samples from above and below a fossil oyster bed in a section on the coast of Bohai Bay, China. The optical ages of the sediments were used to constrain the oyster bed. Single-aliquot regenerative-dose procedures using the OSL signal from fine grain quartz, the IRSL and post-IR OSL signals from polymineral fine grains were employed to determine equivalent dose (D_e). The behaviors of the different luminescence signals from quartz and polymineral grains during D_e measurements were examined. The results showed that the quartz OSL signal is more reliable than the polymineral IRSL and post-IR OSL signals with respect to dating for these coastal samples. The optical ages indicated that the oyster reef formed between ca. 6.2 and 5.0 ka.     

内蒙古大青山北石兰哈达石英闪长岩构造环境讨论

内蒙古大青山北石兰哈达地区的晚古生代黑云石英闪长岩,1∶20万区域地质调查时将其置于华力西中期第二次侵入体(δο42(2)),现经岩石学、地球化学、同位素年代学研究,认为该石英闪长岩为早二叠世岩浆活动的产物。岩石具高铝、高钾、高钙的特点,A/CNK<1.1,σ在2.05～2.83之间,为高钾钙碱性岩,属I型花岗岩类,产于碰撞后的抬升构造环境。岩石稀土总量偏低,LREE富集,δEu=0.8～1.0,稀土曲线呈右倾平滑型,其物质来源很可能是源于软流圈的玄武质岩浆与元古宙地壳物质混合作用的结果。     

JMD型滤池双层滤料的净水试验及比较

大量的试验数据表明石英砂和陶粒组成的双层滤料，其净水处理性能明显好于石英砂和无烟煤双层滤料以及单层石英砂滤料，特别是出水浊度、微絮凝作用，反冲洗周期、藻类的去除、絮凝剂的使用量等指标上具有明显优势，陶粒做为一种新的水处理滤料，正被应用于净水和污水处理。     

粉石英在蓄电池胶壳中的应用

本文着重介绍了粉石英的工艺矿物特性以及其在蓄电池胶壳中的应用效果,证明了粉石英用作蓄电池胶壳的填料,能够改善混炼工艺、提高产品质量、增加填充量、降低生产成本,是一种理想的橡胶填料。     

内蒙古迪彦庙蛇绿岩带早石炭世闪长岩成因与古亚洲洋洋内俯冲作用

由于缺少对SSZ型蛇绿岩和洋内弧火成岩的系统研究,制约了古亚洲洋东段古生代洋内俯冲过程的进一步认识。本文报道了内蒙古迪彦庙SSZ型蛇绿岩带北部新发现的巴嘎哈尔早石炭世闪长岩。LA-ICP-MS锆石U-Pb定年显示,巴嘎哈尔闪长岩的侵位年龄为324.2±1.8 Ma,其形成时代为早石炭世末期。巴嘎哈尔闪长岩SiO₂含量为57.71%～61.24%;高铝(Al₂O₃含量为15.58%～16.68%);具有相对富钠(Na₂O含量为3.29%～4.15%)、低钾(K₂O含量为1.05%～1.69%)的特征,Na₂O/K₂O比值为2.18～3.95;MgO含量较高(3.30%～4.23%),Mg^#为47.20～51.82;贫TiO₂(0.65%～0.76%)和P₂O₅(0.14%～0.15%);稀土元素总量(ΣREE为85.19×10^-6