城镇地震防灾与应急处置一体化综合查询系统研究

本文在研究政府、社会公众以及地方地震工作部门日常地震防灾与震后应急处置过程中对地震相关业务信息需求的基础上,通过系统架构、业务功能、业务流程等设计,完成了城镇地震防灾与应急处置一体化综合查询系统的设计研究。     

岩浆隐爆作用与金矿化的关系——以华北地台北缘金矿为例

以中元古代碎屑岩—碳酸盐岩为容矿岩石的浸染型金矿床是近年来发现的金矿新类型。 本文简要介绍了该类金矿床的地质特征、矿床类型和成矿模式。 提出华北地台北缘该类金矿的成矿作用与岩浆隐爆作用密切相关。     

浅层土（溶）洞的地震探测问题探讨

对埋深≤30m的土(溶)洞做了理论模型,并对其进行研究(高斯射线束法),再依据三维地震勘探方法,根据我院在工作中的实测成果,指出了土(溶)洞异常的解释理论要点和解释依据,说明了土(溶)洞在实际工作中的复杂多变性。     

低成熟石油概念厘定及其多元多源复合连续成油特征

本文指出了低成熟石油概念和实际划分上的不统一和不规范,并给出了初步定义。另外,对低成熟石油的相关成烃母质进行了综述,在此基础上给出了低成熟成烃母质的定义,指出了低成熟石油成烃母质的多元性和油源的多源性特点,同时还指出低成熟石油是沉积有机质在地质埋藏过程中波动成烃连续模式之部分,其具有多元多源复合成烃行为和分阶段连续演化的特征。这些认识对正确评价含油气盆地中的低成熟油气资源具有重要意义。     

The Late Cretaceous source-to-sink system at the eastern margin of the Tibetan Plateau: Insights from the provenance of the Lanping Basin

The surface uplift of the Tibetan Plateau(TP) and its geomorphology evolution has triggered aridification of Asia's interior and drainage development at the eastern margin of the plateau.However, how the pre-Cenozoic early growth histories of the TP impact the drainage system and climate is poorly constrained.The Late Mesozoic Lacustrine evaporite-bearing basins on the eastern margin of the TP record significant information on the uplift of the source terranes, source-to-sink system development and climate change.In this study, we presented detrital zircon U–Pb ages from the Upper Cretaceous Yunlong Formation in the Lanping Basin, as well as Hf isotopic, petrographic, direct statistical, and multidimensional scaling analyses, and use them to characterize the provenance and reconstruct the drainage system.All of the samples have five major age peaks at 200–290 Ma, 400–490 Ma,750–1000 Ma, 1750–1950 Ma, and 2400–2600 Ma with mostly negative ε_(Hf)(t) values(81%).We infer the sediments are primarily derived from recycled sediments of the Songpan-Garze terrane, and partly from the Sichuan Basin and the Southern Qiangtang terrane, as well as the exposed magmatic rocks of the Yidun Arc and SongpanGarze terrane.The provenance features of the contemporaneous sediments from the Sichuan, Xichang, Chuxiong,and Simao basins indicate a complex hierarchical drainage pattern on the eastern margin of the TP during the Late Cretaceous.The hierarchical drainage system exhibits a complete gradational cycle of lake-basin types from overfilled freshwater Sichuan Basin through balanced fill saline Xichang Basin and underfilled hypersaline Chuxiong, Lanping, Simao, and Khorat Plateau basins from proximal to distal.The early growth of the TP primarily controlled the drainage and lake-basin evolution by not only causing the uplift and exhumation of the source areas and providing large amounts of clastic material to the proximal sub-drainage areas but also intensifying the aridity and deposition of evaporites.     

Simplified equivalent multiple baseline solutions with elevation-dependent weights

Since the assumption of all stations tracking the same satellites with identical weights was previously employed by Shen and Xu (GPS Solut 12:99–108, 2008) to derive the simplified GNSS single- and double-differenced equivalent equations, this supplementary paper expands these simplified equations in the case of each station tracking different satellites with elevation-dependent weights. Numerical experiments are performed to demonstrate the computational efficiency of the simplified equivalent algorithm relative to the traditional method in various scenarios of multi-baseline solutions with tracking different satellites. The fast computational speed of the simplified equivalent algorithm will potentially benefit the local, regional and even global GNSS multi-baseline solutions as well as the combined GNSS application.

Small-scale heterogeneities below the Lanzhou CTBTO seismic array,from seismic wave field fluctuations

Seismic wave field fluctuations below Lanzhou Comprehensive Test Ban Treaty Organization seismic array are determined and interpreted to describe the scattering characteristics of the crust beneath the northeastern margin of Qinghai–Tibet plateau in China. The frequency-dependent intensities of the mean and fluctuation wave fields are analyzed for 21 deep (206–632 km depth) teleseismic events. The observed wave field fluctuations in the frequency range 0.5–2.5 Hz can be explained by the scattering of the teleseismic P wave front at random media-type structures. The stable and narrow range of the fluctuation parameters from these teleseismic events indicates evidence for scattered seismic phases which are generated inside the crust. The reasonable structural models contain heterogeneities with 1–3% velocity fluctuations and 2.4–8.2 km correlation lengths in the crust with 53 km thickness.     

西秦岭北缘断裂带的深部构造特征及其与地震活动的关系

西秦岭北缘断裂带是中国的一条主要超壳断裂带，也是祁连褶皱系与秦岭褶皱系的分界断裂带。利用近几年取得的人工地震、重力、航磁、地热等资料，从地质和地球物理两个方面就该断裂及其两侧的深部构造特征作一初步分析并讨论了断裂带的最新活动及地震活动。     

抚顺西露放边坡工程地质灾害浅析

根据抚顺西露天矿地质灾害及其成灾性的现场调查和室内试验测试数据资料,对边坡地质灾害类型进行归纳、分析。     

黑龙江省那丹哈达与日本美浓地区古地磁结果对比及意义

在那丹哈达地区采集了中三叠世红色硅质岩样品，古地磁分析测试结果表明，该岩样的磁性特征与日本西南美浓地区同时代硅质岩具有相似性，反映了二者是同源同构造环境下的产物。依据沉积地层组合和古地磁数据，那丹哈达和日本美浓地区原为同一地体，而且三叠纪以来均存在大规模北向位移。同时，古地磁数据还表明了日本海是约在８０Ｍａ，相当于晚白垩世开始扩张的，致使那丹哈达与日本美浓两地体相互分离