Comprehensive Study of the Activity in the Middle Sections of Huangzhuang-Gaoliying and Babaoshan Faults

To monitor the activity of the Huangzhuang-Gaoliying and Babaoshan faults in their middle sections,a network for leveling,short-side ranging,and gravity and geomagnetic observations at the same time and at the same station was set up.By this network,the time and space distribution and the relation between different observations have been studied.It is considered that the Huangzhuang-Gaoliying fault is in a locked state for rapid strain energy accumulation,while the Babaoshan fault is in a state of creep or unrestrained motion.To do comprehensive monitoring of fault activity by making deformation,gravity,and geomagnetic observations at the same time and at the same station,it would be possible to acquire the microscopic state of fault activity and the data of earthquake preparation; such an approach is considered worth popularizing.     

唐山地震的重力异常及其震后变化

将唐山地区 1 981～ 1 997年流动重力资料进行整理 ,分析唐山地震前后重力变化的全过程。震后二十余年 ,唐山地区未出现过震前量级的重力异常 ,且在震后 1 0年里重力值逐渐恢复至正常水平。研究表明 ,唐山地震前的异常变化是确实存在的 ,1 995年 1 0月古冶 ML5.4地震前亦出现了形态相似的重力变化     

Rupture process of November 6,1988,Lan-cang-Gengma,Yunnan,China,earthquake of M_s=7.6 using empirical Green’s function de-convolution method

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中国金矿床分布的分形研究

根据1:40O万中国岩金成矿图,在矿床地质研究基础上,用分形理论探讨了中国岩金矿的空间分布。研究表明,在两个尺度范围内,金矿床在空间上呈分形分布,其中数盒子法的分维数D分别为0.3333(5～80km)和1.3259(80～2400km);密度分布的分维数D分别为1.2033(5～80km)和1.5459(80～2400km)。金矿床的分形分布给超大陆旋回会聚构造边缘控制金矿的分布及成矿作用的观点以有力的佐证。     

陕北奥陶系钾盐层位的发现与研究

陕北奥陶系是一个大型海相蒸发岩盆地,笔者在盆地东侧下奥陶统马家沟组,发现了钾石盐,光卤石等钾盐矿物,这是世界上首次在奥陶系发现钾盐,笔者较详细地研究了地质条件,含盐岩系剖面特下,物质成分和地球化学等,探讨了蒸发岩沉积的古地理环境和成盐模式据蒸发岩组成特征,结构构造,赋存状态,组合关系,地球化学诸方面的综合研究,认为陕北盆地钾盐沉积形成于残留卤水湖和干盐湖阶段。     

Distribution and Significance of Carbazole Compounds in Palaeozoic Oils from the Tazhong Uplift, Tarim

Carbazole compounds in crude oils from the Tazhong uplift of the Tarim basin have been fractionated and detected and successfully used to study petroleum migration and trace source rocks in the study area. Alkylcarbazoles have been found in large amounts in the oil samples analyzed and alkylbenzocarbazoles detected in a small concentration only in part of the samples, but alkyldibenzocarbazoles have not been found in oils. Based on the distribution of G1, G2 and G3 of C2-alkylcarbazoles, the ratio of C3-carbazoles to C2-carbazoles and the relative amounts of alkylcarbazoles and alkylbenzocarbazoles, one can know that the vertical oil migration in the Tazhong uplift is generally from below upward, i.e. from the Ordovician through the Silurian to the Carboniferous. Evidently, source rocks in the uplift should be lower Palaeozoic strata (Ordovician and Cambrian). This study shows that carbazoles are of great importance in the study of petroleum migration and source rocks.     

The Crustal Structure and Assembly of Terranes in the Qaidam-Qilian-Beishan Area, Western China

Through a study of the geotransect from Golmud to Ejin Qi published recently, the tectonics of the crust beneath the area from the northern Qinghai-Tibet plateau (Qaidam and the Qilian Mountains) to the border between China and Mongolia and its structure, composition and tectonic evolution have been revealed, and abundant information about the deep structures has been provided. Based on the research into the geotransect, it is suggested that the crust in this area was formed by the assembly of the terranes in different geological stages. Following the formation of the Palaeo-Asian continent, the north part of the corridor of the transect became a part of the huge unifying continent by the end of the Early Permian. In the Mesozoic and Cenozoic, as a result of the compression mainly by the push of the Qinghai-Tibet plateau on the south, the unique crustal structure and geomorphologic features on the northern Qinghai-Tibet plateau were formed. This geotransect together with the Yadong-Golmud geotransect co     

塔中地良奥陶系地层格架与沉积演化

塔里木中部地区奥陶系大致以Ⅰ号断裂为界分东北和西南两个地层分区,自下而上分白云岩段、灰岩段、泥质灰岩段、泥岩夹灰岩段、泥岩夹砂岩段、砂砾岩段、泥岩夹砂岩段、泥岩灰岩互层段和砂岩段等9个岩性段。早奥陶世,塔中地区以碳酸盐岩台地相为主,自西向东为局限台地相、开阔台地相、台地边缘相和深水斜坡相。中——晚奥陶世,塔中地区西部以混积陆架相为主,东部以深水斜坡相为主。中—晚奥陶世,塔中东部及塔东地区在构造上具弧后前陆盆地性质。中—上奥陶统地层完整地记录了该盆地从形成发展到消亡的过程,即早期为深水斜坡相复理石活动沉积,晚期演化为浅海陆架相稳定沉积。     

碳酸盐岩压溶埋藏史和排烃数值模拟模型初步探讨

压溶作用产生的缝合线是烃富集的场所及初次运移的通道。碳酸盐岩烃源岩压溶过程,随着地层厚度和体积的减小,未熟和低熟油气会伴随孔隙流体一同排出。根据碳酸盐岩埋藏与压溶机理,提出了压溶的碳酸盐岩缝合线或溶解缝厚度恢复及其古厚度恢复的数学模型,同时结合碳酸盐岩基质和缝合线孔度随深度的变化曲线建立了定量计算碳酸盐烃源岩压溶排烃量的数学模型。上述数学模型的关键是确定压溶作用开始和结束的深度和时间,缝合线的厚度     

浙江桐庐冷坞二叠纪生物礁的发育模式

礁体底部具脉状层理的潮坪相碎屑沉积,礁体内部藻叠层岩夹层的存在,及礁体上部为煤系地层覆盖等都表明冷坞生物礁是一个典型的二叠纪岸礁;海绵骨架岩的存在表明它是个骨架型岸礁。