http://www.sciencedirect.com/science/article/pii/S1674987111000491

Based on the interpretations of three seismic profiles and one wide-angle seismic profile across the Northwest Sub-basin, South China Sea, stratigraphic sequences, deformation characteristics and an extension model for this sub-basin have been worked out. Three tectonic-stratigraphic units are determined. Detailed analyses of extension show that the event occurred mainly during the Paleogene and resulted in the formation of half-grabens or grabens distributed symmetrically around the spreading center. Sediments are characterized by chaotic and discontinuous reflectors, indicating clastic sediments. Farther to the southwest, the sub-basin features mainly continental rifting instead of sea-floor spreading. The rifting would have been controlled by the shape of the massif and developed just along the northern edge of the Zhongsha-Xisha Block, rather than joined the Xisha Trough. After 25 Ma, a southward ridge jump triggered the opening of the Southwest Sub-basin. The NW-directed stress caused by the sea-floor spreading of the Northwest Sub-basin may have prevented the continuous opening of the sub-basin. After that the Northwest Sub-basin experienced thermal cooling and exhibited broad subsidence. The deep crustal structure shown by the velocity model from a wide-angle seismic profile is also symmetrical around the spreading center, which indicates that the Northwest Sub-basin might have opened in a pure shear model.     

东天山-北山镁铁-超镁铁质岩特征、成矿意义及构造背景

东天山-北山地区镁铁-超镁铁质岩体成群成带分布,明显受区域内主干断裂控制,主要分布于东天山、中天山地块和北山裂谷。镁铁-超镁铁质岩体与Cu-Ni矿化密切相关,小岩体成大矿为普遍现象。含矿岩相多集中在橄榄辉长岩、角闪橄榄岩、辉橄岩和各岩相接触带上。岩体低Ti高Mg,高m/s和m/f是评价其含矿性的良好指标。SrNd同位素显示镁铁-超镁铁质岩体整体上源于亏损地幔,在演化过程中经历了同化混染作用,中天山和北山地区较东天山地区混染程度较小。成岩成矿集中在早二叠世约280 Ma,指示其可能是统一地球热力学的产物。镁铁-超镁铁质岩体的构造背景复杂,争议较多,单一的构造背景不能解释所有问题,后碰撞伸展和地幔柱的共同作用可能诱发大规模成岩成矿事件。     

基于MATLAB的定点形变观测数据时频分析软件设计及应用研究

为方便台站工作人员快速准确分析定点形变观测数据的时频响应特征,利用MATLAB软件研发了基于小波分析和同步挤压时频变换的交互式数据处理与成图软件包。该软件包遵循模块化设计原则,利用导入模块读取从中国地震前兆台网数据处理系统下载的原始数据,利用预处理模块对缺失数据进行插值补全,利用小波分解与重构模块从原始数据中提取待分析的目标信号分量,利用同步挤压时频分析模块对提取目标进行高精度时频分析,并在各模块关键节点中增加绘图功能,全部处理过程采用绘图-参数输入-绘图交互的方式进行,参数灵活可调,且每步计算结果直观清晰。应用该软件包对2020年1月至2021年6月西昌小庙台DSQ型水管仪和SS-Y型伸缩仪整时值采样数据进行固体潮时频计算,并与理论固体潮时频结果进行对比,结合时频辅助分析方法,从时频谱角度初步评价了2套仪器观测资料的质量情况,为台站日常数据跟踪分析提供了参考。     

南极磷虾商业化开发的战略性思考

南极磷虾的区域特色、资源保有量优势和广泛的应用价值,使它成为重要的战略资源。南极磷虾商业化开发战略是海洋战略的重要组成部分,其资源特色为战略制定与实施提供了支撑,符合战略性新兴产业发展要求。基于中国海洋开发的战略环境,结合南极磷虾资源特色,评估其战略能力,确立发展目标为形成并完善南极磷虾资源开发的产业体系,确立发展战略重点为跟踪南极磷虾资源养护管理措施变化和开发利用政策、中国南极磷虾产业发展模式及风险评估、中国发展南极磷虾产业关键技术突破与产业化机制、中国发展南极磷虾产业的政策措施与保障机制研究。     

广东东莞不同类型云的雨滴谱和降水特征

利用设置在东莞站的Parsivel激光降水粒子谱测量系统于2010年获取的观测资料,对数据有效性进行验证并开展15次降水的特征参量分析。层状云降水（S）、积层混合云降水（M）、积雨云降水（C）各选取两次典型过程,对各种特征参量之间的相关性和雨滴谱特征进行细致分析,结果表明：平均粒子直径、平均雨强、平均雨水含量、过程最大立方根直径、过程最大雨强的分布规律明显,基本遵循“C>M>S”的规律;同种类型降水的雨滴谱型非常接近,层状云存在单峰谱,混合云和积状云是明显的双峰谱或多峰谱; M、C型降水的大雨滴明显多于S型降水;雨水含量与雨强的相关性最好,雷达反射率因子与雨强的相关性次之;层状云降水主要为1 mm以下小粒子,积状云和积层混合云降水雨滴谱宽较大,1 mm以上大粒子数浓度较大。     

江苏省冬季连阴雨（雪）期间异常环流特征及其成因

利用江苏省24个国家站降水、日照时数观测资料,以及NCEP/NCAR再分析资料、海温指数、HadISST全球海表温度资料,采用EOF分析、合成分析等方法,分析了1961—2019年江苏省冬季连阴雨（雪）出现次数全省一致偏多年份的异常环流特征及其成因。结果表明：江苏省冬季连阴雨（雪）出现次数的空间分布主要为全省一致型和南北相异型,前者为主要模态。连阴雨（雪）出现次数全省一致偏多型年份,中高纬高层欧亚地区上空环流形势为“＋ － ＋”分布型,位于青藏高原北部高压脊以及东亚大槽和欧洲东部低压槽均较常年偏弱。低层位于欧亚地区中部的冷高压较常年偏弱,导致冷空气势力偏弱。中低纬低层西太平洋(菲律宾附近)存在异常反气旋环流,其西部的异常偏南气流加强了水汽的向北输送,冷暖气流在30°N交汇抬升,为江苏省连阴雨（雪）天气过程提供了有利的水汽条件和抬升条件。当中部型El Nio事件发生时,Walker环流在西太平洋的异常下沉气流会激发出异常反气旋,使得东亚冬季风减弱,向北水汽输送加强,导致江苏省一致偏多型连阴雨（雪）天气的发生。     

Grain Coarsening of Hematite in the Gushan Iron Deposit,Anhui Province,China

The iron ores of the Gushan mine occur in the contact zone of a Mesozoic diorite intrusion and are composed primarily of hematite microcrystallites and chalcedony,The hematite microcrystallites have undergone post-mineralization recrystallization and coarsening with resultant formation of lath-shaped hematite porphyroblasts.Microscopic investigation reveals that recrystallization and coarsening of the hematite ores of the Gushan mine took place without the formation of new nuclei,due to the coalescence of the microcrystallites.The whole process could have begun with the mutual approach of the microcrystallites,followed by grain rotation to realize paralleism and ending by the welding of these grains to form optically homogeneous porphyroblastic hematite.     

保险与地震系统在开展震灾保险中的合作模式

震灾保险新制式是地震科技导入保险营运过程以强化其科学性，规范性的一次创新尝试；制式的推行同时将给保险与系统的联手协作主各自相关业务的拓展带来新的概念和新的该文论述了这种合作的方式和特点，并向人们展示了合作必将获妈巨大社会效益的良好前景。     

Molecular Records of Primary Producers and Sedimentary Environmental Conditions of Late Permian Rocks in Northeast Sichuan, China

A series of biomarkers were identified in the aliphatic and aromatic fractions of the extracts from Late Permian Dalong (大隆) and Wujiaping (吴家坪) formations in Shangsi (上寺) Section, Northeast Sichuan (四川), South China, on the basis of the analysis of gas chromatography-mass spectrometry (GC-MC). The dominance of lower-molecular-weight n-alkanes throughout the profile suggests the dominant contribution of algae and bacteria to the organics preserved in the marine section. Wujiaping Formation is characterized by the elevated contribution from algae as well as other photoantotrophs such as photosynthetic bacteria as shown by the molecular ratios of hopanes to steranes or tricyclic terpanes as well as the ratio of pristane (Pr) and phytane (Ph) to C17 and C18 n-alkanes. This is in accord with the data from the microscopic measurement on the calcareous algae. In contrast, Dalong Formation is featured by enhanced contribution from bacteria and probably terrestrial organics indicated by the enhanced C24 tetracyclic terpanes relative to tricyclic terpanes. The two formations also show a distinct discrimination in sedimentary environmental conditions including redox condition and salinity. The anoxic condition was only found in the middle of the Dalong Formation as shown by the ratios of Pr/Ph and dibenzothiophene to phenanthrene, consistent with the reported data of Mo and U. An enhancedsalinity indicated by the homohopane index is observed at the shallow Wujiaping Formation. On the basis of the composition of primary productivity and the redox condition, Dalong Formation is proposed, herein, to be potential hydrocarbon source rocks in the study site. It is notable that the topmost end-Permian is characterized by a large perturbance in both the redox condition and salinity, with oxic conditions being frequently interrupted by short-term anoxia, likely showing a causal relationship with the episodic biotic crisis across the Permian-Triassic boundary.