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Peri-Gondwanan terranes in the Romanian Carpathians:A review of their spatial distribution,origin,provenance,and evolution

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Geoscience Frontiers 2014年第3期5卷 395-411页

作者： Ioan Balintoni Constantin Balica mihai N.ducea Horst-Peter Hann Department of Geology Babes-Bolyai University400084 Cluj-NapocaRomania Department of Geosciences The University of Arizona1040 E.4th StreetTucsonAZ 85721USA Faculty of Geology and Geophysics Bucharest UniversityStr.N.Balcescu Nr 1BucurestiRomania Institut fr Geowissenschaften Universitt Tbingen72076 TbingenGermany

The basement of the Romanian Carpathians is made of Neoproterozoic to early Paleozoic peri- Gondwanan terranes variably involved in the Variscan orogeny, similarly to other basement terrains of Europe. They were hardly dismembered during the Alpine orogeny and traditionally have their own names in the three Carpathian areas. The Danubian domain of the South Carpathians comprises the Dragsan and Lainici-Paiius peri-Amazonian terranes. The Dragsan terrane originated within the ocean surrounding Rodinia and docked with Rodinia at -800 Ma. It does not contain Cadomian magmatism and consequently it is classified as an Avalonian extra-Cadomian terrane, The Lainici-Pfiius terrane is a Ganderian fragment strongly modified by Cadomian subduction-related magmatism, It is attached to the Moesia platform. The TisoviD terrane is an ophiolite that marks the boundary between Drfagsan and Lainici-Paius terranes. The other basement terranes of the Romanian Carpathians originated close to the Ordovician North- African orogen, as a result of the eastern Rheic Ocean opening and closure. Except for the Sebes-Lotru terrane that includes a lower metamorphic unit of Cadomian age, all the other terranes （Bretila, Tulghes, Negrisoara and Rebra in the East Carpathians, Somes, Biharia and Baia de Aries in the Apuseni mountains, Fagaras, Leaota, Carat and Pades in the South Carpathians） represent late Cambrian-Ordovician rock assemblages. Their provenance, is probably within paleo-nortbeast Africa, close to the Arabian-Nubian shield. The late Cambrian-Ordovician terranes are defined here as Carpathian-type terranes. According to their lithostratigraphy and origin, some are of continental margin magmatic arc setting, whereas others formed in rift and back-arc environment and closed to passive continental margin settings. In a paleo- geographic reconstruction, the continental margin magmatic arc terranes were first that drifted out, followed by the passive continental margin terranes with the b

关键词： Romanian Carpathians pre-Alpine terranes U-Pb Geochronology Avalonian-type and Carpathian-type terranes Tornquist Rheic and Paleotethyan sutures Ordovician North-African orogen

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变泥质岩的深熔作用与具铈(Ce)负异常熔体的成因

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岩石矿物学杂志 2005年第5期24卷 425-430页

作者：曾令森 mihai ducea Jason SALEEBY 中国地质科学院地质研究所国土资源部大陆动力学重点实验室北京100037 美国亚利桑那大学地质系美国加州理工学院地质与行星科学系

对美国加州南Sierra Nevada岩基中一个典型的中生代变质表壳岩及其混合岩带进行了详细的野外观察和元素地球化学研究。研究发现:在持久(约为150Ma)的花岗岩侵位作用下,早白垩世变泥质岩发生达角闪岩相的中高级变质作用和部分熔融,导致Is... 详细信息

对美国加州南Sierra Nevada岩基中一个典型的中生代变质表壳岩及其混合岩带进行了详细的野外观察和元素地球化学研究。研究发现:在持久(约为150Ma)的花岗岩侵位作用下,早白垩世变泥质岩发生达角闪岩相的中高级变质作用和部分熔融,导致Isabella混合岩的形成;浅色体具有和变泥质岩及混合岩近平行的REE分布模式,但浅色体的LREE含量相对较低;和变泥质岩相似,混合岩中的浅色体具有显著的Ce负异常。野外观测、岩相观察及元素地球化学特征表明,浅色体显著的Ce负异常是继承了原岩的Ce负异常特征,而不是由于副矿物(磷灰石、独居石或锆石)的差异溶解或结晶分异作用造成的。早白垩世变泥质岩(浅色体的原岩)主要由泥质及沙质海相沉积物组成,局部夹基性火山灰和火山碎屑,形成于与大陆岛弧密切相关的浅海环境。原岩的Ce负异常反映了较还原的浅海沉积环境。具有Ce负异常浅色体的产出表明,如果俯冲带上的沉积岩在俯冲过程中发生部分熔融作用并且所产生的熔体参与大洋型岛弧岩浆作用,最终可以导致具有Ce异常的基性岩浆生成。

关键词：混合岩浅色体深熔作用铈负异常 Sierra Nevada岩基

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Oxidization of the mantle caused by sediment recycling may contribute to the formation of iron-rich mantle melts

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Science Bulletin 2020年第7期65卷 519-521,M0003页

作者： Detao He Yongsheng Liu Chunfei Chen Stephen F.Foley mihai N.ducea State Key Laboratory of Geological Processes and Mineral Resources School of Earth SciencesChina University of GeosciencesWuhan 430074China ARC Centre of Excellence for Core to Crust Fluid Systems Department of Earth and Planetary SciencesMacquarie UniversityNorth RydeNew South Wales 2109Australia Department of Geosciences University of ArizonaTucsonAZ 85721USA Faculty of Geology and Geophysics University of BucharestBucharest 010041Romania

Mantle-derived primary magmas generally have FeOtot contents of about 11 wt%.However,some primary melts show extremely high FeO^tot(>13 wt%)with high MgO(>12 wt%)(ferropicrite)[1].Considering the influence of chemical and mineral compositions of the mantle source on melt compositions,it has been argued that ferropicrites may be near-primary partial melts of pyroxenite formed in the convecting mantle[2–4],whereas others favor an origin by partial melting of an iron-rich peridotitic mantle source[5,6].Melting experiments have shown that melting conditions such as pressure and temperature can strongly influence the melt compositions,such that ferropicrites may be generated by partial melting of an olivine-dominated mantle source at^5 GPa[5].Some ferropicrites seem to be more oxidized than other magmas,as suggested from the Panzhihua intrusions in the Emeishan large igneous province[7],which may imply melting of a more oxidized mantle ***,Johnston and Stout[8]showed that oxygen fugacity exerts great control on the compositions and stabilities of Cr-Fe-rich minerals,and may therefore significantly affect mantle-derived melt *** oxygen fugacity(fO2)and solidus temperature of the mantle can be dramatically affected by recycled sedimentary *** raises the question as to whether sedimentary carbonate recycling could have indirectly contributed to the formation of iron-rich melts in the mantle.

关键词：硫化物矿床单斜辉石矿物组合碳酸岩镁铁矿氧逸度辉石岩再循环

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Mechanical Properties of Collagen Biomimetic Films Formed in the Presence of Calcium,Silica and Chitosan

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Journal of Bionic Engineering 2008年第2期5卷 149-158页

作者： mihai Chirita Medical Bioengineering Faculty Medicine and Pharmacy University "Gr.T.Popa"Iasi 7000115Romania

Using eucollagen solutions from ox hide, we cast collagen films to assess the influence of calcium and silica on the reconstitution of the fibrous structure of collagen. The tensile strength and the breaking elongation of the reconstituted collagen films were measured and analysed. Significant differences were observed between reconstituted collagen films with and without calcium and silica. The breaking elongation of the films obtained in the presence of silica was significantly greater, and the degradation was lower than other films of reconstituted collagen. Collagen and chitosan do not exist together as blends in nature, but the specific properties of each may be used to produce in biomimetic way man-made blends with biomedical applications, that confer unique structural, mechanical （detail） and in vivo properties.

关键词： modified collagen biomimetic films chitosan biomaterials biopolymers mechanical properties

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Regularity Properties of the Degenerate Monge-Ampère Equations on Compact Khler Manifolds

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Chinese Annals of Mathematics,Series B 2008年第6期29卷 623-630页

作者： mihai PAUN Institut lie Cartan Université Henri PoincaréNancy 1 BP 239 54506 Vandoeuvre-lès-Nancy Cedex France.

The author establishes a result concerning the regularity properties of the degenerate complex Monge-Ampère equations on compact Khler manifolds.

关键词： Monge-Ampère operator Estimates Pluripotential theory

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Weak Solutions for the Vlasov-Poisson Initial-Boundary Value Problem with Bounded Electric Field

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Chinese Annals of Mathematics,Series B 2007年第4期28卷 389-420页

作者： mihai BOSTAN Laboratoire de Mathématiques Université de Franche-Comté 16 route de Gray F-25030 BesanconFance.

The aim of this work is to construct weak solutions for the three dimensional Vlasov-Poisson initial-boundary value problem with bounded electric field. The main in-gredient consists of estimating the change in momentum along characteristics of regular electric fields inside bounded spatial domains. As direct consequences, the propagation of the momentum moments and the existence of weak solution satisfying the balance of total energy are obtained.

关键词： Vlasov-Poisson equations Vlasov-Maxwell equations Weak solutions

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Automatic landing system using neural networks and radio-technical subsystems

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Chinese Journal of Aeronautics 2017年第1期30卷 399-411页

作者： Romulus Lungu mihai Lungu University of Craiova Faculty of Electrical Engineering

The paper focuses on the design of a new automatic landing system（ALS） in longitudinal plane; the new ALS controls the aircraft trajectory and longitudinal velocity. Aircraft control is achieved by means of a proportional-integral（PI） controller and the instrumental landing system– the first phase of landing（the glide slope） and a proportional-integral-derivative（PID） controller together with a radio-altimeter – the second phase of landing（the flare）; both controllers modify the reference model associated with aircraft pitch angle. The control of the pitch angle and longitudinal velocity is performed by a neural network adaptive control system, based on the dynamic inversion concept, having the following as components： a linear dynamic compensator, a linear observer, reference models, and a Pseudo control hedging（PCH） block. The theoretical results are software implemented and validated by complex numerical simulations; compared with other ALSs having the same radio-technical subsystems but with conventional or fuzzy controllers for the control of aircraft pitch angle and longitudinal velocity, the architecture designed in this paper is characterized by much smaller overshoots and stationary errors.

关键词： Adaptive control Automatic landing Neural network PID Reference model

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Review of the bennettitalean genus Weltrichia

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Journal of Palaeogeography 2019年第2期8卷 109-129页

作者： mihai Emilian Popa Faculty of Geology and Geophysics Department of Geology and Doctoral School of GeologyLaboratory of PalaeontologyUniversity of Bucharest

The bennettitalean male reproductive structure Weltrichia Braun 1849 *** 1969(Family Williamsoniaceae) is discussed from several points of view,including anatomy and morphology,species diversity and validity,phytogeographical and stratigraphical distribution,and reproduction strategy.A very rare fossil,genus Weltrichia includes 25 valid species distributed in both hemispheres during Triassic and Jurassic *** contribution critically reviews the systematics of the entire genus,together with its stratigraphical and palaeophytogeographical significance.

关键词： Bennettitales Weltrichia Male reproductive structure Triassic Jurassic

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New results on Cll and C12 lattices with applications to Grothendieck categories and torsion theories

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Frontiers of Mathematics in China 2016年第4期11卷 815-828页

作者： Toma ALBU mihai IOSIF Simion Stoilow Institute of Mathematics of the Romanian Academy Research Unit 5 P.O. Box 1-764 RO-010145 Bucharest 1 Romania Bucharest University Department of Mathematics Academiei Str. 14RO-010014 Bucharest 1 Romania

In this paper, which is a continuation of our previous paper [T. Albu, M. Iosif, A. Tercan, The conditions （Ci） in modular lattices, and applications, J. Algebra Appl. 15 （2016）, http： ***/10.1142/S0219498816500018], we investigate the latticial counterparts of some results about modules satisfying the conditions （Cll） or （C12）. Applications are given to Grothendieck categories and module categories equipped with hereditary torsion theories.

关键词： Modular complement lattice C12 theory element lattice upper closed element lattice Goldie dimension continuous lattice essential element uniform lattice condition (Ci) Cll socle Grothendieck category torsion

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Genus Pronephrium Presl 1851 (Thelypteridaceae) in Romania

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Journal of Palaeogeography 2018年第4期7卷 295-307页

作者： Roxana Pirnea mihai Emilian Popa faculty of geology and geophysics doctoral school of geology university of bucharest 1 N. Ealcescu Ave 010041 BucharestRomania faculty of geology and geophysics department of geology laboratory of palaeontology university of bucharest 1 N. Ealcescu Ave 010041 BucharestRomania

Pronephrium stiriacum（Unger） Knobloch et Kvatek 1976（Filicales, Thelypteridaceae Holttum 1971） is reported from the Oligocene Petrosani Basin and from the Miocene Bozovici Basin in Romania. Morphological variations of this species, such as size of the leaves, venation and marginal teeth, in the Oligocene-Miocene time interval in Romania are described, discussed and illustrated. The distribution of the Thelypteridacean species Pronephrium stiriacum is also discussed regarding its European expansion during the Cenozoic. Moreover, the palaeoecology of this species is discussed based on taphonomy and occurrences, as Pronephrium stiriacum was a secondary coal generator.

关键词： Thelypteridaceae Pronephrium stiriacum Oligocene Miocene Romania

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