标定大陆科学钻探孔区地震反射体

在中国大陆科学钻探孔区 (江苏省东海县南部 )进行了系统的地球物理调查 ,包括二维地震测网和专门的地震剖面 ,大地电磁法和位场方法等 .地震调查表明 ,在超高压变质岩出露区上地壳充满了反射体 ,包括倾斜反射体与上拱的反射弧 .本文介绍大陆科学钻探先行研究中地震调查的成果 .根据大陆科学钻探预先导孔的岩芯和测井资料、井旁VSP和数值模拟结果证实 ,高波速的榴辉岩体、破碎断裂带和大型韧性剪切带都可引起倾斜的地震反射 ,而上拱的弧形反射体则是由近似直立的榴辉岩体和其中的破碎带的综合反映 .由于地壳深部广泛分布着经受变质的岩石 ,上述研究结果对标定地壳中的反射地震信号具有一定意义     

辐照绿柱石的色心与赋色机制

在不同辐照剂量的带电粒子作用下，四川无色绿柱石因赋色而呈现浅蓝色，蓝绿色，黄绿色，浅黄色及橙黄色，紫外可见吸收光谱（UV－VIS）和阴极发光光谱（CLS）研究表明，辐照绿柱石中存在两组与赋色密切相关的色心组合，其一为相对稳定的[Fe^3 ]OH和[Fe^3 4]心，其二则为不稳定的[H^0]i心和F^ 心，二者对可见光的能量分别具有不同程度的选择性吸收和发射，由此产生特征的吸收与发射光谱。低温退火处理（210℃），有助于消除辐照绿柱石中不稳定的色心，使相对稳定的[Fe^3 ]OH心黉度再度聚集，并形成新的缺陷（二次缺陷），进而提高稳定色心的主波长和饱和度。研究证实，二次缺陷形成的初始温度，可近似代表辐照绿柱石的最佳热固色温度点，经辐照与热固色作用而形成的黄色，橙黄色绿柱石的颜色相对稳定，并不因长期日照或低温受热（＜280℃）而褪色。     

钻石的肉眼鉴别

根据钻石的光学性质、导热性、亲油疏水性、硬度与工艺钻点,以及钻石的某些表面与内部特征,利用10倍放大镜肉眼可以比较有效地鉴别钻石及其模仿品。     

中国大陆西部强震前超低频磁场时空变化特征

对2015年至2019年期间中国大陆西部的磁通门磁力仪秒采样观测资料开展了5—100 s频段的地磁垂直强度极化分析,并运用一些数学方法对分析结果进行了处理.结果显示,极化高值在经向和纬向均无明显的形态和幅值变化,且极化高值与地磁外源场扰动无关.在此基础上筛选出18次极化高值异常事件,利用插值方法得到了极化高值异常的空间...     

SKS splitting beneath Capital area of China

Based on the polarization analysis of teleseismic SKS waveform data recorded at 49 seismic stations in Capital Area Seismograph Network,the SKS fast-wave direction and the delay time between the fast and slow shear waves at each station were determined by using the grid searching method of minimum transverse energy and the stacking analysis method,and then we acquired the image of upper mantle anisotropy in Capital area.In the study area,the fast-wave polarization direction is basically WNW-ESE,and the delay time falls into the interval from 0.56 s to 1.56 s.The results imply that the upper mantle anisotropy in Capital area is mainly caused by the subduc-tion of the Pacific plate to Eurasian plate.The subduction has resulted in the asthenospheric material deformation in Capital area,and made the alignment of upper mantle peridotite lattice parallel to the deformation direction.And the collision between the Indian and Eurasian plates made the crust of western China thickening and uplifting and material eastwards extruding,and then caused the upper mantle flow eastwards,and made the upper mantle de-formation direction parallel to the fast-wave direction.The deformation model of the crust and upper mantle is possibly vertically coherent deformation by comparing the fast-wave polarization direction with the direction of lithospheric extension and the GPS velocity direction.     

中天山东段古生代淡色花岗岩的发现及其构造意义

在吐鲁番地区底坎尔南的中天山构造带,新发现含电气石和石榴石的淡色花岗岩侵入于富铝泥质片岩系中。SHRIMP U-Pb锆石年代学分析,表明淡色花岗岩的形成不晚于354±16Ma,同时还给出了600～1200Ma的原岩继承锆石年龄。淡色花岗岩的发现及其形成年龄的确定,表明中天山在354Ma前具有与陆缘弧背景相似的构造环境,并在354Ma前完成碰撞过程,为进一步研究古生代天山构造演化提供了新的证据。     

三水盆地古近系下部湖相沉积的稀土元素地球化学特征及其古气候意义

通过分析三水盆地古近系下部岩心的稀土元素丰度和分布模式,并结合其它地球化学指标(Fe/Mn, Mg/Ca),重建了古近纪早期的古气候条件。岩心中稀土元素总量（∑REE）变化于7.06~230.01 μg /g之间,平均值为142.32 μg/g。接近全球平均大陆上地壳成分（UCC）,略低于北美页岩。沉积物显示轻稀土相对富集、右倾斜型、Eu中度亏损以及Ce异常不明显的稀土元素分布模式。岩心各深度处稀土元素分布模式非常相似,且与UCC的稀土元素分布模式基本一致。表明沉积物具有较为一致的物质来源和形成机理,而且源区具有大陆上地壳性质。岩心沉积时期古气候变化经历了较为干燥—温湿—温湿与干旱气候交替出现—以温湿气候条件为主的四个阶段。总体上显示明显的变湿趋势。     

Pharmacokinetics and acetylation of sulfamethoxazole in turbot <Emphasis Type="Italic">Scophthalmus maximus</Emphasis> after intravascular administration

The pharmacokinetic profiles and sulfamethoxazole (SMX) acetylation process in turbot reared at 18°C were investigated. Either SMX (parent drug) or its acetylized metabolite, N₄-acetylsulfamethoxazole (AcSMX), was administered intravascularly to turbot at a dosage of 50 mg/kg BW. Serum concentrations of the parent drug and its metabolite were both measured by HPLC, and the changes in concentration over time were analyzed in two- and non-compartment models because SMX treatment produced multiple peaks. The results demonstrated that the elimination half-life of the parent drugs, SMX and AcSMX, were 159.2 and 5.9 h, respectively. The apparent volume of distribution was 0.2 and 0.8 L/kg, and the clearance was 0.038 and 0.222 L/(h·kg), for SMX and AcSMX, respectively. SMX acetylation in turbot was 2.8%, and the deacetylation of AcSMX was 0.2%. These findings may be useful in optimizing SMX dosage regimens in turbot aquaculture.     

水中爆破地震动强度计算方法的研究

介绍了爆破地震动强度的主要因素及经验公式 ,分析了利用最小二乘法求场地系数K、α值方法的不足之处 ,提出最大似然法求解K、α值的新思路 ,并用实例证明了其具有更高的预测准确度