塔里木北部地区三叠系储层溶蚀作用机理

塔里木北部地区三叠系储层在成岩演化过程中曾经历两期溶蚀作用，深埋成岩环境的晚期溶蚀较早期近地表－浅埋成岩环境溶蚀要剧烈得多，溶蚀作用的最大特点是铝硅酸盐矿物较碳酸盐矿物剧烈。溶蚀作用发生的机理是由于三叠系储层处于８０～１２０℃热窗、成岩流体富含低分子量羧酸、碱度由低分子量羧酸控制，铝硅酸盐和碳酸盐矿物均处于去稳定状态。溶蚀作用的发育程度受控于储层砂体的沉积和岩石学特征以及早期成岩发育程度。     

塔中石炭系碎屑岩深埋藏优质储层成因探讨

塔中地区石炭系碎屑岩为一套次生－原生孔隙型深埋藏优质储层。储集岩为中细粒－细粒石英砂岩，储层形成于古地温梯度低、沉积物浅埋时间长、深埋时间短、孔隙水矿化度高及较早被油气占居的条件下，致使原生孔隙保存较好。同时，塔中地区石炭系目前刚进入８０℃－１２０℃的强溶成岩阶段，次生孔隙正在发育，距离碳酸盐岩沉淀带和后期石英次生加大带尚有较大深度，因而储层的孔渗性维持在最佳状态。     

太古宙克拉通型下地壳剖面：华北怀安－丰镇－尚义的麻粒岩－角闪岩系

华北克拉通北缘晋冀内蒙交界地区有变质程度连续变化、从高压基性麻粒岩、麻粒岩到角闪岩相的变质岩系出露。它们的古变质压力由＞１．４ＧＰａ（５０ｋｍ）变化到０．５ＧＰａ（１５ｋｍ）；岩石类型从变辉长岩、中酸性正片麻岩到表壳岩变化；变质矿物组合由不含水的耐火组合变为富含云母和角闪石的组合；地球化学性质表现出从贫Ｓｉ和Ａｌ、轻度亏损生热元素到具有正常的化学成分的连续变化；包裹体流体性质在轻度亏损生热元素的麻粒岩中均为ＣＯ２流体，而在麻粒岩相的表壳岩和角闪岩系中Ｈ２Ｏ流体逐渐增加。上述变质岩系剖面的组成和特点符合大陆下地壳的定义，可能代表了包括最下部地壳在内的华北地块太古宙克拉通型大陆下地壳。据此本文建立了我国第一条克拉通型大陆下地壳剖面，并讨论其地质意义以及相关的问题     

华北中北部高级变质岩区的构造区划及其晚太古代构造演化

通过区域构造编图及重点地段的详细研究，在华北克拉通中北部识别出一条ＮＮＥ向的构造带——龙泉关－桑干带，它以大规模的韧性剪切带网络、重熔钾质花岗岩带、数量众多的高压麻粒岩构造透镜体或岩片为特征。剪切带以低角度逆冲为主，矿物拉伸线理指示运动方向为ＮＷ－ＳＥ向。这些剪切带造成东西两侧基底杂岩与表壳岩系包括孔兹岩系的广泛构造叠置，以及高压麻粒岩的近等温减压上隆。从更大的范围看，龙泉关－桑干带处于鄂尔多斯克拉通和阜平－赞皇克拉通之间，并且被五台－吕梁裂谷型绿岩带截切或不整合覆盖。该带应形成于晚太古代，记录了上述两个克拉通斜向拼合的构造过程     

武宁陆相红盆沉积特征与演化浅析

本文依据1:5万区调资料,扼要介绍了武宁陆相红盆填图单位的拟定、表示方法及工作原理的应用,重点叙述了红盆内多个冲积扇体特征及其之间的叠覆关系,阐明了盆缘断裂是控制红盆成生、发展演化的主导因素。对红盆成生及演化、时代也作了初步探讨。     

Jadeitic rocks within high pressure metamorphic zone from northeastern Jiangxi Province and their forming and surviving conditions

There is a close relation in time, space and origin between the NEJXO, NEJXDFZ and HPMZ from NEJXP which are located in and constrained by both Yangtze Craton and Cathaysia. These HPMRs principally include (i) Jd-Q-Ab schist, (ii) Lw-Jd-Ab schist, (iii) Jd-Ab schist, and (iv) Gl-schist. The Jd is nearly pure (Jd91-98). Jd surrounded by Ab is separated from Q and survived due to the reaction between Jd and Q, while Lw encircled by Ab remains as a pseudomorph composed of CZo+An. The minerals associated with Jd are Lw, Gl, Ab, Q, CZo, An, Pa, II, Ru, Sp, Ap, and Zr. According to the textures, the mineral paragenesis is classified into four groups (i) PI-Am-Q, (ii) Jd-I,w-GI-Q, (iii) CZo-An-Ab-Q, (iv) Ab-Ana-Ser-Ur, corresponding to (i) 1.0–0.93 Ga, 250°C, 2–3 × 10⁸ Pa; (ii) 0.93–0.79 Ga, 300–350°C, 5–12 × 10⁸ Pa; (iii) 0.79–0.223 Ga, 350–400–120°C, 12–5–3 × 10⁸ Pa; and (iv) < 0. 223 Ga, < 120–50°C, < 3 × 10⁸ Pa, in time, temperature and pressure respectively. A clockwiseP-T-t path is isothermal increasing inP (up to 45 km)—isothermal decreasing inP (up to 5 km)— nearly isobar decreasing in T. Project supported by the National Natural Science Foundation of China.     

Research on Relationship Between Fluorine in Tap Water and That in Urine of Chinese Residents

In this study, the relationship between fluorine in drinking water and that in urine of urban residents in China is assessed. Fluorine concentrations in tap water and those in urine show a good correlation with a linear regression coefficient of 0. 9798, indicating that the fluorine concentrations in big cities under investigation are extremely low, and the main source of fluorine is tap water. The weather effect on the intake amount of fluorine is also discussed. When air temperature is above 15℃, people would intake more fluorine through drinking water with the rise of air temperature. When temperature is below 15℃, no remarkable relationship is observed between air temperature and the intake amount of fluorine. This phenomenon indicates that the main source of fluorine in China is tap water instead of foodstuff.     

中国春季沙尘天气频数的时空变化及其与地面风压场的关系

文中利用EOF和SVD方法分析了近半个世纪中国春季沙尘天气频数的时空分布特征及其与近地面风速和海平面气压的关系。中国北方大部分地区春季沙尘天气发生频数近半个世纪呈减少趋势 ,2 0世纪 70年代末以前沙尘天气发生频数较多 ,70年代末开始逐渐减少 ,1997年降到最低值 ,同期中国近地面风速也呈减小趋势 ,两者之间存在显著相关。春季海平面气压场与中国沙尘天气的发生频数有十分密切的联系 ,海平面气压在中高纬度地区降低 ,中低纬度地区升高 ,气压梯度发生改变 ,从而引起地面风速减小 ,进一步影响到沙尘天气发生频数减少     

用L-曲线法确定半参数模型中的平滑因子

提出了一种新的方法——L-曲线法确定平滑因子。通过确定合适的平滑因子，更好地控制了残差部分V^TPV与光滑度部分S^TRS之间的平衡，得到了更准确的参数估值。通过算例，将基于L-曲线法确定平滑因子的半参数模型解算方法和其他方法进行了比较。结果表明，用L-曲线法确定平滑因子后，提高了半参数模型计算结果的精度，可以更好地将观测值中的系统误差分离出来。