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An integrated north–south paleo-Dadu-Anning river: New insights from bulk major and trace element analyses of the Xigeda Formation

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China Geology 2024年第1期7卷 91-103页

作者： Yong Zheng Hai-bing Li Jia-wei Pan Ping Wang Ya Lai Zheng Gong Key Laboratory of Deep-Earth Dynamics Institute of GeologyChinese Academy of Geological SciencesChina Geological SurveyMinistry of Natural ResourcesBeijing 100037China Jiangsu Donghai Continental Deep Hole Crustal Activity National Observaion and Research Station Lianyungang 222300China Southern Marine Science and Engineering Guangdong Laboratory Guangzhou 511458China Geophysical Exploration Center China Earthquake AdministrationZhengzhou 450002China Institute of Geophysics China Earthquake AdministrationBeijing 100081China

The Xianshuihe-Anninghe fault extends SE–S and constitutes the southeastern margin of the Tibetan ***,the Dadu river which is associated with the fault does not flow following the path,but makes a 90ºturn within a distance of 1 km at Shimian,heading east,and joins the Yangtze river,finally flowing into the East China *** to the abrupt turn,a low and wide pass near the Daqiao reservoir at Mianning separates the N–S course of the Dadu river from the headwater of the Anning river which then flows south into the Yunnan Province along the Anninghe ***,many previous studies assumed southward flow of the paleo-Dadu river from the Shimian to the Anning ***,evidences for the capture of the integrated N–S paleo-Dadu-Anning river,its timing,and causes are still *** study explored the paleo-drainage pattern of the Dadu and Anning rivers based on bulk mineral and geochemical analyses of the large quantities of fluvial/lacustrine sediments along the trunk of the Dadu and Anning *** with sands in the modern Dadu river,the Xigeda sediments also exhibit a granitoid affinity with the bulk major mineral compositions of quartz(>50%),anorthite(about 10%),orthoclase(about 5%),muscovite(about 5%),and clinochlore(about 4%).Correspondingly,bulk major elements show high SiO_(2),with all samples>60%,and some of them>70%,low TiO_(2)(≤0.75%),P_(2)O_(5)(≤0.55%),FeO*(≤5%),and relatively high CaO(1.02%–8.51%),Na_(2)O(1.60%–2.52%),and K_(2)O(2.17%–2.71%),with a uniform REE ***,synthesizing all these results indicate that these lacustrine sediments have similar material sources,which are mainly derived from its course in the Songpan-Ganzi flysch block,implying that the paleo-Dadu originally flowed southward into the Anning river and provided materials to the Xigeda ancient *** rearrangement of the paleo-Dadu river appears to be closely related to the locally focused uplift driven by strong activities of the Xians

关键词： Dadu river Anninghe fault river diversion Xigeda Formation Tectonic uplift Provenance Songpan-Ganzi flysch Ancient lake Xianshuihe-Xiaojiang fault system Tibetan Plateau

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Plans for the Construction of La Bre a Ⅱ Dam in Spain

Plans for the Construction of La Bre a Ⅱ Dam in Spain

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The Fifth International Symposium on Roller Compacted Concrete(RCC) Dams

作者： Francisco Romero Antonio Sandoval Rafael Ibá ez de Aldecoa Gonzalo Noriega Acuavir Technical Director Acuavir La Bre a Ⅱ Dam Project Manager Dragados S.A. Head of the Hydraulic Works Division Dragados S.A. La Bre a Ⅱ Dam Contract Manager

La Bre a Ⅱ RCC straight gravity dam on the Guadiato river,very close to Cdrdoba city in southern Spain,will be the largest European RCC dam when it will be completed with 119 m in height and 1.4×10 m of RCC volume out of a total of 1.6×10 m of *** Project is at a very early stage of RCC placement at the moment of writing this *** of the main difficulties of the Project is that the dam body has to be built only some 100 m downstream of the existing 54 m high La Brefia I concrete curved gravity dam,and without disturbing the normal operation of it and its related hydropower *** paper reviews the design,the construction layout planned,describing the diverse and very important plant implemented,as well as various previous activities of fundamental importance for the Project,including the complex river diversion scheme adopted due to the existing dam,the spillway’s scale model study,and the RCC full-scale *** benefits obtained from the last two are particularly stated.

关键词： river diversion scale model study FST(Full Scale Trial) MEVR(Mortar-Enriched Vibratable RCC) concrete cooling

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