四川盆地海相三叠系液态钾盐──富钾含钾气田卤水及其类型和意义

四川盆地海相三叠系富钾含钾气田卤水分布广、品质优、资源富。气田卤水除普遍富合K+组分,构成液态钾盐资源外,Br-、I-、B3+、Li+、Sr2+等有用组分也超过或达到工业品位,为优质化工原料水。富钾含钾气田卤水有沉积变质型和钾盐溶滤叠加型两类。卤水具重要的资源意义和固液态钾盐找矿的指示意义。     

郯庐断裂带南段韧性剪切带糜棱岩化过程中长石成分和结构状态变化特征的研究

在对郯庐断裂带南段３条韧性剪切带中糜棱岩及围岩进行矿物组合、结构构造观察研究的基础上,对长石矿物进行了多项分析测试,发现长石成分及其结构状态参数的变化与构造应力场的构造作用存在明显的对应关系：随剪切变形作用的加强,长石矿物的结构状态参数呈增大趋势,矿物单位晶胞的体积和斜长石中Ｓｉ／Ａｌ比值随之减小;长石的变形指数（Ｉｓｓ）和斜长石中的钙长石分子（Ａｎ）与岩石的变形强度呈明显的正相关关系。这些研究结果为探讨构造变形场中矿物岩石的变形 变质作用提供了一种简捷有效的手段     

Microtextures of authigenic Or-rich feldspar in the Upper Jurassic Humber Group, UK North Sea

ABSTRACT Detrital alkali feldspars currently at burial depths of 3·2–3·5 km in the Upper Jurassic Humber Group of the Fulmar oilfield, UK North Sea, are overgrown and have been partially replaced by authigenic Or‐rich feldspar. Intracrystal microtextures suggest several different provenances for the detrital grains. The overgrowths are uniformly non‐cathodoluminescent and have occasional celsian‐rich zones. Transmission electron microscopy shows that they are composed of a microporous mosaic of subµm‐ to µm‐sized sub‐grains associated with barite, illite and pyrite. The subgrains are somewhat rounded but have an approximate {110} Adularia habit and display a faint modulated microtexture on the nanometre scale. They have triclinic symmetry, but the lattice angles depart only slightly from monoclinic symmetry. These features are characteristic of K‐feldspar precipitated relatively rapidly and at low temperature. Authigenic Or‐rich feldspar has also partially replaced microcline and perthitic albite within the detrital grains, often at a suboptical scale. Although, like diagenetic albitization, replacement by K‐feldspar is probably a very common diagenetic reaction, it has rarely been reported owing to difficulties in imaging the diagnostic textures with the scanning electron microscopy techniques used by most workers. The permeability of the subgrain microtexture may significantly hinder the use of feldspar overgrowths for K/Ar and ⁴⁰Ar/³⁹Ar dating of diagenesis, and the existence of suboptical, replacive authigenic K‐feldspar within detrital grains may significantly modify the apparent Ar ages of detrital grains. Similar subgrain microtextures in optically featureless quartz overgrowths are also illustrated.     

松辽盆地白垩系砂岩长石碎屑的钠长石化作用

松辽盆地白垩系砂岩以长石岩屑砂岩和岩屑长石砂岩为特征。砂岩中发育长石碎屑、岩屑等不稳定组分，而且随着埋藏深度加深（成岩作用加强）钾长石逐渐减少并最终在2700m以下消失。斜长石碎屑中钠长石组分逐渐增多，钙长石组分逐渐减少，最终形成纯钠端元的钠长石。在成岩过程中长石碎屑的钠长石化主要有3种方式：①由离子交代作用导致长石碎屑的钠长石化；②长石碎屑边缘钠长石次生生长；③与长石碎屑溶解伴生的新生钠长石作用。结合热动力学平衡原理分析，斜长石的钠长石化基本不受成岩温度和压力的制约，而钾长石的钠长石化需要较高的成岩温度和压力作用才能进行。因此，斜长石的钠长石化可见于成岩早期，而钾长石的钠长石化只发生于成岩晚期。     

Continuous flow analysis of dissolved total phosphorus in seawater by UV-K2S2O8 online digestion method

Several methods for analysis of dissolved total phosphorus in seawater were reviewed. Discussions were focused on UV irradiation and persulphate oxidation methods which are the most popular dissolved organic phosphorus determination methods presently. The compounds used for the phosphorus recovery test were categorized into three groups according to their chemical structure. It was found that low power UV irradiation can decompose P-O-C or P-C bonds efficiently but may be inefficient for P-O-P bonds. Heating-bath in acid condition is useful for decomposing P-O-P bonds. Using the continuous flow analysis system (Auto-analyzer Ⅱ), UV digestion and heating-bath, series experiments were carried out based on the above analysis. Eleven model compounds were employed for the phosphorus recovery test and the factors influencing the decomposition efficiency of dissolved compounds containing phosphorus were clarified. Finally, the optimal design for determination of dissolved total phosphorus in seawater based on the routine continuous flow analysis system was presented. For the organic mono-phosphate, the recovery is more than 90% and a recovery of 33%～51% was obtained for inorganic or organic polyphosphates. Up to now, this is the highest decomposition efficiency for dissolved phosphorus based on the continuous flow analysis system.     

过硫酸钾氧化法测定水中总有机碳

根据《海洋监测规范》规定的总有机碳分析方法 ,利用HW 5 61 0非色散红外CO2 气体分析仪 ,设计制造成功总有机碳分析装置 ,对《海洋监测规范》的方法进行了根本的改进 ,方法成熟可靠。用该仪器和方法测定TOC ,检出限低于 0 .0 1mg/L ,重现性优于 1 % ,达到了与进口TOC分析仪相近的分析精度及再现性 ,而该TOC分析仪的制造成本仅相当于进口仪器价格的 1 / 1 0～ 1 / 5 ,值得海洋、河流、湖泊等有关监测和研究部门借鉴。     

察尔汗盐湖霍布逊区段资源开采过程中储卤层系统变化特征研究

柴达木盆地察尔汗盐湖赋存储量可观的低品位固体钾盐矿, 其主要的开发方式为液化开采。本文对比分析了霍布逊区段盐湖资源大规模开采前(2004年)和开采后(2011年和2019年)典型钻孔岩芯孔隙度、固体钾矿含量、卤水组分变化特征, 评价了钾盐液化开采效率。结果表明: 由于大规模采卤使得大量高矿化度卤水被带出, 而低矿化度水体补给储卤层孔隙并溶解盐层中盐类矿物, 使得储卤层孔隙率有逐渐增大趋势; 卤水中主要组分KCl和NaCl浓度均出现降低现象, 而MgCl2则出现增加趋势, 这主要与补水工程及补给水体中兑卤有关。在这期间, 卤水矿中KCl品位下降幅度要小于固体矿床KCl品位下降幅度, 说明卤水溶解了石盐层中大量固体低品位钾矿, 提升了其KCl品位。本次研究对于优化霍布逊区段固体钾盐液化开采方案具有重要的指导意义。     

内蒙古阿巴嘎旗阿德拉嘎碱长花岗岩锆石LA- ICP- MS U- Pb年龄、地球化学特征及构造意义

阿巴嘎旗阿德拉嘎碱长花岗岩位于贺根山蛇绿岩带北侧。为了确定该碱长花岗岩体的岩石成因类型,探讨其构造环境,对该岩体进行了野外地质、岩石学、地球化学和LA- ICP- MS锆石U- Pb年代学研究。锆石LA- ICP- MS U- Pb测年表明,阿德拉嘎碱长花岗岩体的侵位年龄为310. 7±2. 6Ma,形成时代为晚石炭世。岩石地球化学研究表明,阿德拉嘎碱长花岗岩具有较高的SiO2、Na2O+K2O含量和较高的Ga/Al、（Na2O+K2O）/CaO值,相对贫CaO、MgO、Sr、Ba、Eu、Ti和P。稀土元素总量较低,轻重稀土分馏不明显,稀土配分曲线呈海鸥性,负铕异常明显（δEu=0. 15~0. 37）。岩石学和岩石地球化学特征表明,该碱长花岗岩为A型花岗岩,形成于弧后伸展构造环境,为晚石炭世古亚洲洋向西伯利亚俯冲作用的产物。     

碳酸钠碱熔-电感耦合等离子体发射光谱法测定石墨中的常量元素硅铝钙镁铁钛锰磷

石墨化学性质稳定,需采用高温碱熔(1000℃)才可使样品分解完全,已有分析方法在样品前处理不同的阶段使用不同材质的坩埚。基于石墨性质和坩埚熔样情况,本文采用预先已均匀铺垫0.50 g碳酸钾的高熔点铂坩埚灼烧石墨样品,样品灼烧后直接在原坩埚中加入0.80 g碳酸钠碱熔,熔融物用稀盐酸提取后用电感耦合等离子光谱法(ICP-OES)实现了石墨中8种常量元素(硅铝钙镁铁钛锰磷)的同时测定。方法检出限为13~228μg/g,方法精密度(RSD,n=12)为0.7%~7.2%;全流程加标回收率为90.5%~105.0%;实际土状和鳞片石墨样品的测定结果与化学分析法无显著差异。本方法避免了铂坩埚的损毁和样品在前处理过程中的损失,分析过程简单、分析速度快。     

察尔汗盐湖单级与增程驱动溶解固体钾矿试验对比研究

钾盐是一种重要的战略矿产资源,为了合理开发利用察尔汗盐湖的低品位钾矿,在察尔汗盐湖开展了两次野外现场溶矿试验。本文以两次野外现场试验监测数据为基础,对比分析了两次野外溶矿试验的等水位线图、水位剖面曲线、典型孔位与典型剖面的K~+浓度变化,各项指标表明,增程驱动溶矿模式达到了预期试验目的,其溶矿效果优于单级驱动溶矿模式。