皖南和赣东北蛇绿岩成因及其构造意义：元素和Sm－Nd同位素制约

本文对扬子块体南缘构造侵位于板溪群（及相应地层）的皖南和赣东北晚元古代蛇绿岩进行了系统的元素和Ｓｍ－Ｎｄ同位素地球化学研究，结果表明两套蛇绿岩具有类似的元素地球化学特征，即二者的火山岩元素地球化学特征均类似于形成于弧后盆地构造环境的拉斑玄武岩。但是，两套蛇绿岩的Ｎｄ同位素组成明显不同。赣东北蛇绿岩具有相当均一的高εＮｄ（Ｔ）值（＋５．５±１．２），表明来源于一较亏损的上地幔源区，并且没有受到明显的较成熟地壳物质的混染。相反，皖南蛇绿岩的εＮｄ（Ｔ）值低，并有较大的变化范围（＋４．５──１．０），并和Ｓｍ／Ｎｄ、Ｎｄ、ＭｇＯ、ＳｉＯ２呈明显的二元混合相关关系，表明蛇绿岩是由亏损幔源岩浆（初始εＮｄ（Ｔ）≈＋５．５）在结晶分异过程中与地壳组分（初始εＮｄ（Ｔ）≈－１）混合形成的。皖南和赣东北蛇绿岩的Ｎｄ同位素和元素地球化学特征以及该地区的同时代花岗岩和火山岩的时空分布特征，可以用华南和扬子元古宙陆－弧－陆碰撞模式来解释。大约在１．０Ｇａ前，扬子和华南块体之间存在一多岛弧洋盆。大陆边缘岛弧和大洋岛弧在扬子块体南缘发育演化。皖南和赣东北蛇绿岩就是在大陆边缘盆地和弧间盆地演化过程中形成的洋壳构造侵位的碎片。该地区Ｉ型     

蕴震系统自组织演化与构造微动态研究

蕴震系统是在多种环境动力因子作用下，由多个不同性质、不同层次的子系统强烈相互作用所形成的“复杂巨系统”或“复杂的非线性动力学系统”。本文概述了蕴震系统的自组织演化理论，提出并采用蕴震系统方向信息合成法研究了相应的构造微动态特征。     

曲江断裂断面结构及地震地质意义

本文在野外地质调查的基础上，从曲江断裂两盘的地层分布、产状变化、破碎带宽度的异常分布等方面对曲江断裂的断面结构进行了初步分析，认为曲江断裂上存在两个尺度较大的凹凸体。结合该断裂的右旋运动特点，对曲江断裂破碎带异常展宽段及串珠状小盆地的成因给予了解释，同时认为曲江断裂上三次７级以上强震的震中与凹凸体的位置明显相关。     

GRADIENT MEASUREMENTS OF METHANE FLUX IN LIN''''AN RICE PADDIES

From July to September of 1990,CH_4 flux measurements were made in Lin'an rice paddies using gradient profiletechniques.Some characteristics of the turbulence structure under the stable conditions have been verified in the surfacelayer according to the in situ measurements.The semi-empirical turbulent parameters β_m,β_h and β_c and their changeswith the stability parameter Ri are given.Observed results indicate that CH_4 flux in the rice-paddy is mainly decided bythe methnogenesis and the process of CH4 transport from internal soils to the atmosphere,and that the CH_4 verticaltransfer is depressed in the stable surface layer.The CH_4 flux shows that its obvious diurnal changes,and the meanCH_4 flux are higher in nighttime and lower in daytime,and the peaks appear at about 2000 BST at night and 0300 BSTin the early morning,respectively.The mean value of CH_4 flux is about 4.18±2.3 mg/m~2 h.     

GRADIENT MEASUREMENTS OF METHANE FLUX IN LIN’AN RICE PADDIES*

From July to September of 1990,CH₄ flux measurements were made in Lin'an rice paddies using gradient profile techniques.Some characteristics of the turbulence structure under the stable conditions have been verified in the surface layer according to the in situ measurements.The semi-empirical turbulent parameters β_m,β_h and β_c and their changes with the stability parameter Ri are given.Observed results indicate that CH₄ flux in the rice-paddy is mainly decided by the methnogenesis and the process of CH₄ transport from internal soils to the atmosphere,and that the CH₄ vertical transfer is depressed in the stable surface layer.The CH₄ flux shows that its obvious diurnal changes,and the mean CH₄ flux are higher in nighttime and lower in daytime,and the peaks appear at about 2000 BST at night and 0300 BST in the early morning,respectively.The mean value of CH₄ flux is about 4.18±2.3 mg/m² h.     

房山花岗闪长岩体长石斑晶的数学特征及相带划分

对北京房山花岗闪长岩体中长石斑晶进行了系统测量,测点密度平均4.37个/km~2,测量标志为长石斑晶长轴长度和长石斑晶线含量等。对测得数据进行了分布统计、有序样品最优分割、和趋势变化分析等处理。揭示了长石斑晶在岩体中的分布规律和数学特征,划分了趋势岩相带,从而提出了较为合理的岩相带划分原则。     

镉—5—Br—PADAP—溴化十六烷基三甲基铵—十八醇聚氧乙烯(20)醚显色体系的研究及应用

本文研究了镉-5-Br-PADAP-溴化十六烷基三甲基铵-peregalo显色体系的光谱特征,显色条件,络合物的组成、干扰及其消除。实验证明该法灵敏度高,ε=1.3×10~5l·mol~(-1)·cm~(-1)。选择性较好,显色酸度范围较宽pH=8.0-9.5,络合物最大吸收波长为560nm,镉在0-10μg/25ml的含量范围内服从比尔定律。经标准水样、工业废水及生活用水验证,不经分离可测定水中PPb级的微量镉。     

~(218)Po法寻找隐伏铀矿体初见成效

本文介绍了一种寻找隐伏铀矿体的快速测氡方法,即~(218)Po法。作者叙述了该法的工作原理、特点以及找矿效果,并阐述了~(218)Po法寻找隐伏铀矿体的可能性。最后着重叙述了~(218)Po法测量结果的解释方法。通过野外试验,作者认为:~(218)Po法不仅可以寻找隐伏铀矿体,而且能够定量预测盲矿体的埋藏深度与规模。     

Origin and distribution of tonsteins in late permian coal seams of Southwestern China

We have surveyed the areal and stratigraphic distribution of tonsteins in Late Permian coalfields of southwestern China over an area of several hundred thousand square kilometers. We studied the relationship between tonstein distribution and sedimentary environment. Based on mineralogical and petrographic data, we have concluded that these tonsteins originated as air-fall volcanic ashes. Following accumulation in the peat swamps, in situ alteration of the vitric and lithic components took place under acidic conditions, leading to the formation of kaolinite.Based on petrologic, mineralogic, and chemical analytical data, we have determined that the application of mineralogic and geochemical criteria for tonsteins may be useful in correlating coal beds, predicting coal qualities and reconstructing related sedimentary paleoenvironmental conditions.