Les plis hercyniens kilométriques couchés vers l'ouest-sud-ouest dans la région du pic du Midi d'Ossau–col du Somport (zone axiale des Pyrénées occidentales)Kilometric westward Hercynian recumbent folds in the western Pyrenees (Pic du Midi d'Ossau area)

The Palaeozoic of the western Pyrenees shows two superposed tectonics easily defined by their different geometry and the major unconformity of the Permian sediments and volcanics on the Devono-Carboniferous series: an Hercynian tectonic found only in the pre-Permian series, characterised by kilometric westward recumbent folds with a weak cleavage; a Pyrenean tectonic, characterised by tight east–west folds, upright to overturned to the south with slaty cleavage, which is the only deformation found in the Permian and Mesozoic series and the second deformation in the pre-Permian Palaeozoic. The Hercynian folding, roughly perpendicular to the trend of the Pyrenees characterises the northern branch of the Ibero-Armorican virgation. To cite this article: P. Matte, C. R. Geoscience 334 (2002) 773–779.     

基于服务驱动的“天地图·黑龙江”数据快速更新关键技术研究

在分析"天地图·黑龙江"应用需求服务的基础上,本文重点阐述了"天地图·黑龙江"数据快速更新的总体技术路线,并详细描述了多源数据获取与分析整理、遥感影像批量快速更新、基于"天地图·黑龙江"母库的数据动态更新、两期影像变化检测的数据快速更新、地名地址数据快速更新等关键技术。本文提出的基于服务驱动的数据动态快速更新思路,进一步加强了"天地图·黑龙江"地理信息保障服务能力建设。     

基于环境噪声及地震数据对斜坡地震动响应特征分析——以芦山仁加斜坡为例

“4·20”芦山强震导致震区斜坡动力响应强烈,并诱发大量斜坡次生地质灾害。强震后余震频发,在发震断裂附近芦山双石峡谷下游出口,对仁加水电站进水口边坡地震动效应监测初步揭示,该斜坡中上部峰值加速度放大达3.4倍,斜坡放大效应明显,但各监测点场地效应需深入分析。因此,基于对该斜坡环境噪声测试与地震监测数据,采用水平与竖向谱比(H/V)和标准反应谱(SSR)对比分析。研究揭示,该斜坡参考点H/V谱比曲线放大系数约为1.1,场地放大效应微弱;斜坡上部监测点环境噪声揭示H/V与SSR谱比放大峰值频率约为13.0Hz,放大系数为1.2~1.6。环境噪声与地震监测数据对比表明,其平均谱比曲线峰值频率特征接近,但后者谱比放大系数为1.6~2.6。综合研究表明,该斜坡场地地质结构较为单一,其动力效应主要受斜坡地形因素较强,斜坡中上部地形放大效应较明显。基于环境噪声与地震数据对比研究斜坡场地效应,两者在场地卓越频率上较一致,而放大系数后者明显强于前者。     

纳米氢氧化镁的合成方法

以氯化镁和氨水为原料,进行各种工艺条件的试验,在此基础上通过加入各种分散剂获得过滤、洗涤性能良好的氢氧化镁沉淀,并加一定的CaCl2作为添加剂大大提高了产品的收率。根据试验得到最佳的工艺条件,制备出纯度高、成本低的纳米氢氧化镁。     

Stratigraphy and tectonic evolution of the Kazdağı Massif (NW Anatolia) based on field studies and radiometric ages

The Kazda?? Massif was previously considered as the metamorphic basement of the Sakarya Zone, a microcontinental fragment in NW Anatolia. Our new field mapping, geochemical investigations, and radiometric dating lead to a re-evaluation of previous suggested models of the massif. The Kazda?? metamorphic succession is subdivided into two major units separated by a pronounced unconformity. The lower unit (the Tozlu metaophiolite) is a typical oceanic crust assemblage consisting of ultramafic rocks and cumulate gabbros. It is unconformably overlain by a thick platform sequence of the upper group (the Sar?k?z unit). The basement ophiolites and overlying platform strata were subjected to a single stage of high-temperature metamorphism under progressive compression during the Alpine orogeny, accompanied by migmatitic metagranite emplacement. Radiometric age data obtained from the Kazda?? metamorphic succession reveal a wide range of ages. Metagranites of the Kazda?? metamorphic succession define a U–Pb discordia upper intercept age of ca. 230 Ma and a lower intercept age of 24.8 ± 4.6 Ma. This younger age agrees with ²⁰⁷Pb/²⁰⁶Pb single-zircon evaporation ages of 28.2 ± 4.1 to 26 ± 5.6 Ma. Moreover, a lower intercept age of 28 ± 10 Ma from a leucocratic metagranite supports the Alpine ages of the massif within error limits. Reconnaissance detrital zircon ages constrain a wide range of possible transport and deposition ages of the metasediments in the Sar?k?z unit from ca. 120 to 420 Ma. Following high-temperature metamorphism and metagranite emplacement, the Kazda?? sequence was internally imbricated by Alpine compression, and the lowermost Tozlu ophiolite thrust southward onto the Sar?k?z unit. Field mapping, internal stratigraphy, and new radiometric age data show that the Sar?k?z unit is the metamorphic equivalent of the Mesozoic platform succession of the Sakarya Zone. The underlying metaophiolites are remnants of the Palaeo tethys Ocean, which closed during the early Alpine orogeny. After strong deformation attending nappe emplacement, the unmetamorphosed Miocene Evciler and Kavlaklar granites intruded the tectonic packages of the Kazda?? Massif. During Pleistocene time, the Kazda?? Massif was elevated by EW trending high-angle normal faults dipping to Edremit Gulf, and attained its present structural and topographic position. Tectonic imbrication, erosion and younger E–W-trending faulting were the main cause of the exhumation of the massif.     

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提出一种加权半参数模型,对半参数模型中的参数分量与非参数分量分别加权,针对数据的不同特点合理确定权重。分别对模拟数据和GPS真实数据进行处理,并与最小二乘法、岭估计法和半参数模型进行对比,通过残差、均方误差等指标的对比分析可见,加权半参数估计模型得到的估计值与真值最接近,估计残差浮动平缓,均方误差小。     

大理河2017年“7·26”暴雨产洪产沙浅析

阐述了大理河2017年"7·26"暴雨洪水的水文情势,计算了次洪径流量和次洪输沙量,并与历史洪水进行了对比分析,发现本次洪峰流量、次洪径流量和次洪输沙量在历史点群的左上方或点群中间。结果表明:几十年水土保持工作和生态修复政策的实施,大理河流域下垫面发生了一定程度的改变,但是遇到"7·26"这样的强降雨,依然会产生高含沙洪水。     

Late Cretaceous subduction initiation and Palaeocene–Eocene slab breakoff magmatism in South-Central Anatolia,Turkey

The Late Cretaceous Alihoca ophiolite in the Inner Tauride suture zone (ITSZ) of South-Central Turkey represents part of a single ophiolitic thrust sheet that originated from the Inner Tauride ocean. The ophiolite contains upper mantle peridotites, cumulate wehrlites, layered-to-isotropic gabbros, and microgabbroic-to-doleritic dikes. An ophiolitic mélange beneath the Alihoca ophiolite includes blocks of limestone, peridotite, dolerite, basalt, and deep-sea sedimentary rocks (radiolarite, chert) in a matrix comprising sheared serpentinite and mudstone. Isotropic gabbro and dolerite dike rocks show enrichment in Sr, K, Rb, Ba, and Th (LILE) and depletion of Ta, Nb, Zr, Ti, and Y (HFSE), indicating an island arc tholeiite (IAT) affinity. Relatively younger dolerite rocks display low TiO₂ (<0.5 wt.%) contents, concave REE profiles with low HREE concentrations, and high LREE values, typical of boninitic affinities. The Alihoca ophiolite, hence, displays an IAT to boninitic geochemical progression in its magmatic evolution, reminiscent of many other Tethyan ophiolites in the region. It represents the remnant of a forearc oceanic crust, which developed during the early stages of subduction within the Inner Tauride ocean. Volcanic, volcano-sedimentary, and sedimentary rocks of the Uluk??la–Çamard? basin north of the ITSZ disconformably overlie the mafic-ultramafic rocks of the Alihoca ophiolite. Pillowed and massive lavas of the latest Cretaceous–Palaeocene Uluk??la Formation have alkaline basalt-to-basaltic andesite compositions, displaying relatively enriched LILE and LREE patterns with negative Nb and Ta anomalies. These geochemical features suggest that magmas of the Uluk??la–Çamard? volcanic rocks formed from partial melting of a metasomatized lithospheric mantle. This melting event was triggered by the influx of asthenospheric heat through a slab breakoff-induced window in the downgoing Tethyan oceanic lithosphere.     

MAPGIS在北川县“5·12”震后地质灾害调查与评价数据库建设中的应用

"5·12"汶川特大地震给北川县造成重大灾害损失,在开展震后地质灾害调查与评价项目的制图和建库过程中,存在大量的遥感图像、矢量与栅格图形数据以及属性数据需要采集、编辑、储存、入库、分析、查询和更新。本文以MAPGIS6.7为基础,在GPS与RS技术辅助支持下,系统地进行震后地质灾害空间数据和属性数据地采集、编辑、建库、分析和成果输出;并在此基础上总结了基于MAPGIS的震后地质灾害多源数据建库方法和实现技巧,从而实现地质灾害调查数据库规范化管理,满足了震后地质灾害区划评价、专题地图制作和灾后重建规划等对地质灾害信息的要求,为政府有关部门的灾后重建决策提供技术支持。