利津县黄河湿地生态治理浅析

刁口乡自然保护区位于利津县东北部,丰富的湿地植被和水生生物资源已成为当地生态旅游的重要场所和经济来源,但由于区内自然资源开发,特别是石油、天然气的勘探开采,石油外溢引起的大面积水土污染,导致自然生态系统破坏。根据当地地质环境和湿地生态系统特点,制定了工程措施和生物措施的湿地治理设计方案,使黄河湿地生态系统得到恢复,带动当地海洋经济板块发展和产业结构调整。     

东营市矿产资源开发利用现状与保护措施

以东营市矿产资源总体规划为指导,进行矿产资源开发利用与保护措施研究,在开发利用现状的基础上分析当前存在的矿产资源后备基地紧缺、综合利用水平不高以及过度开采等问题,进而提出促进矿产资源开发利用与保护的措施,以便更好地为东营市经济建设和社会发展服务。     

东营市中心城区地热田地热回灌可行性分析

利用东营市中心城区鲁班公寓的地热生产井,对新近纪馆陶组和古近纪东营组热储层进行了自然压力条件下的异层和同层回灌试验。结果表明,回灌量与水头升高呈正相关关系,单位回灌量与水头升高呈负相关关系,馆陶组东热2井回灌能力为东营组东热。井的3倍左右。通过对该地热田热储地质条件、回灌能力及地热水开采潜力的分析,认为目前条件下东营城区还不适宜全面推行地热回灌。     

Petromagnetic heterogeneities in sintering zones of Permian-Triassic traps of Komsomolsk pipe deposit (Yakutsk diamond province)

Doklady Earth Sciences - Complex petrophysical, paleomagnetic, and tectonophysical studies undertaken at the primary diamond deposit of the Komsomolsk pipe, Daldyn-Alakitsk region (DAR), Yakutsk...     

Petrogenesis of extension-related alkaline volcanism in Karaburhan (Sivrihisar–Eskisehir), NW Anatolia, Turkey

Alkaline lavas were erupted as phonolites and trachytes around Karaburhan (Sivrihisar–Eskisehir, NW Anatolia) within the Izmir–Ankara–Erzincan suture zone. These volcanic rocks were emplaced as domes, close and parallel to the ophiolite thrust line. According to ⁴⁰Ar/³⁹Ar geochronological analyses of sanidine crystals from the phonolites, the age of the alkaline volcanics is 25 Ma (Late Oligocene–Early Miocene).The flow-textured phonolites are porphyritic and consist mainly of sanidine, clinopyroxene, and feldspathoid crystals. The clinopyroxenes show compositional zoning, with aegirine (Na_0.82–0.96Fe⁺³_0.68–0.83) rims and aegirine–augite cores (containing calcium, magnesium, and Fe⁺²). Some aegirine–augites are replaced with sodium-, calcium-, and magnesium-rich amphibole (hastingsite). Feldspathoid (hauyne) crystals enriched with elemental Na and Ca have been almost completely altered to zeolite and carbonate minerals. The fine-grained trachytes with a trachytic texture consist of feldspar (oligoclase and sanidine) phenocrystals and clinopyroxene microphenocrystals within a groundmass made up largely of alkali feldspar microlites.Although there are some differences in their element patterns, the phonolites and trachytes exhibit enrichment in LILEs (Sr, K, Rb, Ba, Th) and LREEs (La, Ce, Pr, Nd) and negative anomalies in Nb and Ta. These geochemical characteristics indicate a lithospheric mantle enriched by fluids extracted from the subduction component. In addition, the high ⁸⁷Sr/⁸⁶Sr (0.706358–0.708052) and low ¹⁴³Nd/¹⁴⁴Nd (0.512546–0.512646) isotope concentrations of the alkaline lavas reflect a mantle source that has undergone metasomatism by subduction-derived fluids. Petrogenetic modeling indicates that the alkaline lavas generated from the subduction-modified lithospheric mantle have undergone assimilation, fractional crystallization, and crustal contamination, acquiring high Pb, Ba, Rb, and Sr contents and Pb isotopic compositions during their ascent through the thickened crust in an extensional setting.     

The influence of volcanism on paleoclimate in the northeast of China： Insights from Jinchuan peat, Jilin Province, China

Just like contemporary sediments, peat itself is a good repository of information about climate change, the effects of volcanic activity on climate change have been truly recorded in peat, since it is a major archive of volcanic eruption incidents. A section of sand was identified as tephra from the Jinchuan peat, Jilin Province, China, for the grains look like slag with surface bubbles and pits, characterized by high porosity, and loose structure with irregular edges and corners. According to the peat characteristics of uniform deposition, the tephra was dated at 2002–1976 a B.P. by way of linear interpolation, so the time of volcanic eruption was 15 B.C.–26 A.D. (the calibrated age). While the geochemical characteristics of tephra in this study are quite the same as those of tephra from the Jinlongdingzi volcano at Longgang and from alkaline basaltic magma, with the contents of SiO₂<55%, and the similar contents to Al₂O₃ and Fe, but the contents of Na₂O>K₂O. We speculated that the tephra in this study came from the Longgang volcano group. Compared with 11 recorded volcanic eruption events as shown on the carbon and oxygen isotope curves of the Jinchuan peat cellulose, it is obviously seen that adjacent or large-scale volcanic eruptions are precisely corresponding to the minimum temperature and humidity. It seems that these volcanic eruptions indeed affected the local climate, leading to the drop of regional temperature and humidity. As a result, there was prevailing a cold and dry climate there, and all these changes can be well recorded in peat. So the comparison of volcanic eruption events with information about climate change developed from peat, can provide strong evidence for the impact of volcanism on climate change.     

浅谈山东省防震减灾重点项目档案的管理

山东省防震减灾“十一五”规划项目建设期间,山东省地震局加强对重点项目建设档案的管理工作,保证档案的完整、准确和安全,使项目顺利通过验收,为项目建设后的运行维护留下了完整翔实的宝贵资料。文章对强化全员档案管理意识,建立健全档案管理机构和制度,规范档案工作流程及注重验收时档案的质量等方面进行介绍,进一步阐明如何加强重点项目的档案管理工作。     

老挝波乔省某磁铁矿区磁法勘探

勘查区位于老挝西北部之波乔省,地表风化严重、浮土掩盖厚、深林茂密、基岩露头少,虽然局部地段出露有大量的铁帽,但不敢判断该区是否有大规模的磁铁矿.为此,我们采用1∶10000地面高精度磁法测量以了解磁铁矿的有无、范围、延伸、规模.后期勘探阶段开展2.5D人机交互正反演工作以了解深部磁铁矿的有无.结果表明,在老挝西北部地质勘查程度低的地区开展高精度磁测扫面工作是寻找磁铁矿产行之有效的方法,能够解决基础地质问题,矿山勘查问题,后期运用2.5D人机交互正反演能够解决一定的矿层预测工作.     

Paleomagnetic constraints on Miocene rotation in the central Japan Arc

We present new Middle Miocene paleomagnetic data for the central Japan Arc, and discuss their implications for Miocene rotation. To obtain a refined paleodirection, we made magnetic measurements on basaltic to andesitic lavas and intrusive rocks from 12 sites in the Tsugu volcanic rocks (ca 15 Ma) in the northern part of the Shitara area, Japan. Significant secondary magnetizations in samples with strong magnetic intensities are interpreted as lightning‐induced components. Mean directions carried by magnetite and/or titanomagnetite were determined for all sites. An overall mean direction with a northerly declination was obtained from dual‐polarity site means for nine sites. This direction is indistinguishable from the mean direction for coeval parallel dikes in the northern part of the Shitara area, and also indistinguishable from the Miocene reference direction derived from the paleopole for the North China Block in the Asian continent. These comparisons suggest little or no rotation or latitudinal motion in the study area with respect to the North China Block since 15 Ma. We obtained a refined early Middle Miocene paleodirection (D = 9.7°, I = 52.5°, α₉₅ = 4.8°; 30 sites) and paleopole (82.0°N, 230.8°E, A₉₅ = 5.6°) for Shitara by combining data from the Tsugu volcanic rocks and a coeval dike swarm. An anomalous direction found at three sites could be a record of an extraordinary field during a geomagnetic polarity transition or excursion. Paleomagnetic data from Shitara suggest that: (i) the western wing of the Kanto Syntaxis, a prominent cuspate geologic structure in central Honshu, underwent a counterclockwise rotation with respect to the main part of the southwestern Japan Arc between ca 17.5 Ma and 15 Ma; (ii) collision between the Japan and Izu–Bonin (Ogasawara) Arcs began prior to 15 Ma; and (iii) clockwise rotation of the entire southwestern part of the Japan Arc had ceased by 15 Ma.     

“区域-时间-长度算法”用于甘肃及邻近地区中强地震预测的回溯性检验

应用蒋海昆等改进后的"区域-时间-长度算法"研究了甘肃及邻近地区的中强震地震活动前兆特征。结果表明,该方法在地震预测回溯性检验中效果较好,可作为检测本区的地震活动性异常的一种手段。36次M_s≥5.0中强以上地震震例中,检测出RTL值异常的地震达24次,占研究总数的66.7%,出现异常的时间距离主震的时间间隔集中在10~37个月。