南海西北部水域斑节对虾资源的调查研究

1989－1991年对南海西北部水域进行斑节对虾Penaeusmonodon资源专项调查。结果表明,斑节对虾的密集分布区在海南岛东部和南部海区,其现存资源量为82．6万尾,周年有体长30mm以下的幼虾出现。主要产卵期在9－12月。产卵场在海南岛东部和南部水深30-60m的海区。     

Holocene environmental change according to lake core in Fildes Peninsula of King George Island,Antarctica

Lake core sampled from Xihu in Fildes Peninsula of King Gorge Island, Antarctica could reveal the environmental change of the district. The lake core( GA7) , 9.28 meters long , was sectioned at an interval of 2 cm. Through measuring the organic carbon, magnetic susceptibility, granularity and organic carbon isotope of GA7, by use of 14C age it was estimated that there were four periods of high temperature in Fildes Peninsula; 4800-4400 aB. P. , 3600-3350 aB. P. ,2100 - 1800 aB. P. and 900 aB. P. - present. Meanwhile, results showed that there was a strikingly positive correlation between the content of organic carbon and that of organic carbon isotope (δC01213 ) which could be the substitute indicators of environmental temperature.     

Early Cenozoic paleontological assemblages and provenance evolution of the Lishui Sag,East China Sea

The East China Sea Shelf Basin generated a series of back-arc basins with thick successions of marine- and terrestrial-facies sediments during Cenozoic. It is enriched with abundant oil and gas resources and is of great significance to the petroleum exploration undertakings. Therein, the Lishui Sag formed fan delta, fluvial delta and littoral-to-neritic facies sediments during Paleocene–Eocene, and the research on its sedimentary environment and sediment source was controversial. This study analyzed the paleontological combination characteristics, and conducted a source-to-sink comparative analysis to restore the sedimentary environment and provenance evolution of the Lishui Sag during Paleocene–Eocene based on the integration of detrital zircon U-Pb age spectra patterns with paleontological assemblages. The results indicated that Lishui Sag was dominated by littoral and neritic-facies environment during time corroborated by large abundance of foraminifera, calcareous nannofossils and dinoflagellates. Chronological analysis of detrital zircon U-Pb revealed that there were significant differences in sediment sources between the east and west area of the Lishui Sag. The western area was featured by deeper water depths in the Paleocene–Eocene, and the sediment was characterized by a single Yanshanian peak of zircon U-Pb age spectra, and mainly influenced from Yanshanian magmatic rocks of South China Coast and the surrounding paleo-uplifts. However, its eastern area partly showed Indosinian populations. In particular, the upper Eocene Wenzhou sediments were featured by increasingly plentiful Precambrian zircons in addition to the large Indosinian-Yanshanian peaks, indicating a possible impact from the Yushan Low Uplift to the east. Therefore, it is likely that the eastern Lishui Sag generated large river systems as well as deltas during time. Due to the Yuquan Movement, the Lishui Sag experienced uplifting and exhumation in the late stage of the late Eocene and was not deposited with sediments until Miocene. Featured by transitional-facies depositions of Paleocene–Eocene, the Lishui Sag thus beared significant potential for source rock and oil-gas reservoir accumulation.     

2022年9月5日四川泸定MS6.8地震引起的水温同震响应特征分析

基于全国地下流体观测网的水温观测数据,分析2022年9月5日四川泸定 M_S6.8 地震引起的水温同震响应特征,并结合同震静态应变场探讨了水温同震响应机理。结果表明,泸定 M_S6.8 地震水温同震观测点主要分布在龙门山断裂带和川滇菱形块体中南部; 震中距Δ≤500km范围内水温同震以下降—恢复型和上升型为主,水温同震项数及测项比随震中距的增加逐渐减少; 水温同震响应幅度与震中距和地震能量密度显著相关,且随震中距的增加呈指数衰减,随地震能量密度的增加呈指数增大; 水温同震响应持续时间主要集中在1天以内,持续时间随震中距的增加呈指数衰减。     

柴达木盆地西部新生界异常高压:分布、成因及对油气运移的控制作用

如同世界上其它新生代沉积盆地那样,柴达木盆地在一定深度,区域上普遍存在异常高压。异常高压出现在快速沉积的厚层泥质岩中,水热增压效应明显,而且在上新世末至今发生了强烈的以水平挤压为主的构造运动,因此异常高压的形成是由于不均衡压实作用和构造挤压作用所引起的压应力增大以及热液压力引起流体体积的变化。异常高压是油气运聚的一种重要动力来源:在油气运移中,可以使上覆封隔层产生大量微裂缝,油气向上运移到在较低压储集层中,也可以使封闭性断层开启,通过断层进行侧向运移。     

长时效的正压原始方程能量完全守恒(拟)谱模式

遵循误差反演补偿新计算原理,对正压原始方程传统气象全球拟谱模式方案进行了改造,构造了正压原始方程能量完全守恒全球拟增模式新计算方案,解决了正压原始方程的（非线性）计算稳定性问题和能量守恒整体性质保持问题,改进了相应正压原始方程传统气象全球拟谱模式方案的计算效能。新方案的数值试验表明：在计算实践上,新方案在解决能量守恒问题的同时,可解决（非线性）计算稳定性问题,并在一定条件下可解决非线性计算收敛性问题。进一步的比较数值试验还表明：在计算实践上,新方案具有在提高相应传统气象方案的计算精度,减少其计算量的同时,延长其计算时效,解决其中一类特定“气候漂移”问题方面的效用。本工作原理也适用于斜压原始方程情形。     

成灌高铁运行对成都地磁台观测数据干扰测试

成都地磁台距成灌高铁运行线路垂直距离约1.5 km,使用数字化磁通门磁力仪GM4,在轨道沿线不同距离处进行野外测试。测试结果表明,轨道交通的运行对周围地磁观测环境产生干扰,干扰距离约6 km,干扰主要来自轨道泄露电流及输电线路产生的磁场。     

山东招远大尹格庄金矿成矿流体特征

大尹格庄金矿位于中国胶北地体西北部招平断裂带下盘的蚀变花岗质碎裂岩 (绢英岩 )带中 ,断裂上盘为胶东群变质岩系。金主要产于黄铁绢英岩和黄铁矿±多金属硫化物 石英±碳酸盐脉 -细网脉中 ,构成细脉 -浸染状矿石。对蚀变围岩和金矿石中流体包裹体的研究表明钾长石化岩 (钾长石 -石英脉 )和绢英岩 (第 I和第 II阶段 )的石英中含有丰富的 CO2 -H2 O包裹体 ,而金 -硫化物矿石和石英 -碳酸盐脉 (第 III和第 IV阶段 )中 CO2 - H2 O包裹体数量逐渐减少。显微测温指示 ,钾长石化岩和绢英岩石英中的 CO2 - H2 O包裹体的均一温度范围为 2 80～ 36 0℃ ;而金 -黄铜矿和金 -方铅矿 -闪锌矿矿石中包裹体的均一温度分别为 2 40～ 2 75℃和 180～ 2 5 0℃。显微测温和激光拉曼探针分析表明 ,第 I和第 II阶段的成矿流体含 10～ 2 5mol% CO2 ;而第 III和第 IV阶段的含 <5～ 10 mol% CO2 ,并含少量至可观数量 CH4,H2 S和 SO2 等。广泛的黄铁矿化、碳酸盐化蚀变以及缺乏较高盐度的水包裹体说明金很可能是以硫络合物和碳络合物形式被搬运。金的沉淀与温度下降、由裂隙的(重复 )开放引起明显的压力降低和原始流体的不混溶作用有关 ,具多阶段成矿特点     

Cyclic behavior and failure mechanism of self‐centering energy dissipation braces with pre‐pressed combination disc springs

A new type of bracing system composed of friction energy dissipation devices for energy dissipation, pre‐pressed combination disc springs for self‐centering and tube members as guiding elements is developed and experimentally studied in this paper. The mechanics of this system are explained, the equations governing its hysteretic responses are outlined and large‐scale validation tests of two braces with different types of disc springs are conducted under the condition of low cyclic reversed loading. The experimental results demonstrate that the proposed bracing system exhibits a stable and repeatable flag‐shaped hysteretic response with an excellent self‐centering capability and effective energy dissipation throughout the loading protocol. Furthermore, the maximum bearing force and stiffness are predicted well by the equations governing its mechanical behavior. Fatigue and destructive test results demonstrate that the proposed bracing system can maintain stable energy dissipation and self‐centering capabilities under large deformation cyclic loading even when the tube members exceed the elastic limit and that a larger bearing capacity is achieved by the system that has disc springs without a bearing surface. Copyright © 2016 John Wiley & Sons, Ltd.     

基于改进型BP网络的空间电场分类研究

空间电场信号异常识别是研究地震引起电离层扰动的重要内容。 将空间超低频电场电位数据看作随机数字信号, 以均值、 均方差、 偏度和峰度等四个指标进行描述, 采用“5·12”汶川大地震前空间超低频电场电位数据作为原始数据, 训练改进型BP神经网络, 建立了空间电场信号异常分类识别模型, 并以SOM神经网络进行验证。 计算结果显示, 空间超低频电场电位异常信号主要集中在5°~25°N, 88°~120°E之间的区域, 汶川大地震影响范围内的电离层扰动, 可能是汶川地震发生前引起的, 这与前人研究一致, 说明采用改进型BP神经网络异常分类识别模型研究地震引起的电离层扰动是可行的。