临汾-运城地区高精度航磁异常特征及地质意义

临汾-运城地区位于华北地块南缘,鄂尔多斯地块与河淮地块交界处的南端,是汾渭地堑系的一部分,位于华北克拉通中部山西新生代断陷盆地的南部。研究区区域地质结构复杂,构造运动强烈,岩浆活动频繁。本文基于最新的高精度航磁资料,结合区域地质、区域重力和物性资料等,对临汾-运城地区进行了航磁综合解释。依据化极ΔT磁场不同区带分块特点,详细分析了磁场面貌、特征及其与区域构造的对应关系,展现了不同特征的磁场是构造、岩浆活动以及地层分布等信息的综合体现,并对断裂系统进行划分和研究,揭示了研究区内断裂构造尤其是深大断裂在磁场上的特征。断裂构造总体以NE、NW向展布为主,断裂在磁场图上反映为不同磁场分区的边界线和磁异常梯度带,在其相互作用下,形成了“X”型断裂构造系统;NE向断裂对磁场划分、沉积建造、岩浆作用、变质作用和矿物分布有明显的控制作用;NW向断裂对岩浆作用有一定的控制作用,NW向断裂具有错动NE断裂的特征,NE向断裂形成时间早于NW向断裂。研究成果为今后在研究区进行基础地质研究和寻找铁等金属矿产提供了重要的地球物理依据和参考。

Characteristics of fault structures in the south coastal zone of Taizhou based on aeromagnetic data

The south coastal of Taizhou lies on the magmatic rock belt along the southeast coast of China,which has a complex regional geological structures,intense tectonic movement,and frequent magmatic activities.On the basis of the latest aeromagnetic data,combined with regional geology,gravity,and magnetic susceptibility information,integrated interpretation of the regional aeromagnetic anomalies and their refl ected faults was completed.According to the block features in diff erent zones of the reduction to the pole aeromagnetic data,the magnetic field characteristics and relationship with the structure division were described in detail.The different characteristics of the magnetic field are the concentrated reflection of tectonic movements,magmatic activities,and stratigraphic distributions;the fault structure,especially deep and large fault structures,was inferred and studied.The fault structures were mainly distributed in the NE,NNE,and NW directions,with approximately equal spacing between them.The magnetic anomaly is mainly characterized by the boundary,gradient zones,and beaded anomalies in a different magnetic field.The faults are not only important tectonic boundaries in this region but also tectonic belts that control the distribution of mineralization.Under the interaction of these faults,they form the basic structural pattern of the east-west zone and the north-south block.The NE faults have the largest scale and obviously control the diff erent magnetic fi elds and magmatic activities.The results can provide a reference for further study of the distribution and activity characteristics of magmatic rocks in the coastal zone.

Characteristics and Geological Significance of Aeromagnetic Data in Taiyuan,Shanxi,China

The study area is located in the central part of Shanxi Province,between Qinling Tectonic Belt and Yinshan Tectonic Belt,which is an important part of North China Platform;General direction of the structural line is NNE,with clear geological structure outline and developed structural features.The study area has complex regional geological structure,intense tectonic movement and frequent magmatic activities.Based on the latest high-precision aeromagnetic data,integrated interpretation was completed,combining with the existing geological and geophysical research results.According to the block features in different zones of the RTP aeromagnetic data,this article thoroughly studied the characteristics of aeromagnetic anomalies and found the relationship between aeromagnetic anomalies and surface geological information,and the fault distribution,magmatic rock distribution and magnetic characteristics in this area are discussed.

Characteristics and Geological Significance of Aeromagnetic Data in the South of Shanxi

The study area is located in the south margin of the North China Block, the south end of the juncture between the Ordos Block and the Hehuai Block, which is part of Fen-Wei Graben System and located in the south of Shanxi Cenozoic fault basin in the central part of the North China Craton. The study area has complex regional geological structure, intense tectonic movement and frequent magmatic activities. Based on the latest high-precision aeromagnetic data, integrated interpretation was completed, combining with the existing geological and geophysical research results. According to the block features in different zones of the RTP aeromagnetic data, this article thoroughly studied the characteristics of aeromagnetic anomalies and found the relationship between aeromagnetic anomalies and surface geological information, and the fault distribution, magmatic rock distribution and magnetic characteristics in this area are discussed.

Chronic Exposure to Environmentally Relevant Concentrations of Tetracycline Perturbs Gut Homeostasis in Zebrafish

The prevalence of residual antibiotics is a global threat to human health.Less is known about the potential health effects of residual antibiotics in freshwater systems.Here,zebrafish were used to explore chronic effects of environmentally relevant concentrations(ERCs)of tetracycline(TC).Although chronic exposure to TC did not significantly alter the body weight of adult zebrafish,the exposed zebrafish parents exhibited substantial changes in gut microbiota composition and a reduced gut-weight ratio.Notably,male fish exposed to TC showed a significant decline of critical intestinal function-related metabolites(i.e.,triglycerides,glucose,and free fat acid),while this was not observed in females,resulting in sex-dependency.The gut microbial composition of chronically exposed zebrafish parents changed substantially,but the disruption was not transferred to their respective offspring without exposure.However,the perturbation of insulinrelated signaling pathways caused by TC exposure was not attenuated in the zebrafish offspring after removal of TC exposure.Taken together,our findings suggest that chronic exposure to TC disturbs gut microbial communities and metabolism and exerts chronic effects on the insulin/IGF-1 mediated signaling cascades,implying that exposure to antibiotics not only leads to the selection of resistant microbes but also poses long-term deleterious health risks for the next generation.