Structural Characteristics and Formation Mechanism in the Micangshan Foreland,South China

Lying at the junction of the Dabashan,Longmenshan and Qinling mountains,the Micangshan Orogenic Belt coupled with a basin is a duplex structure and back-thrust triangular belt with little horizontal displacement,small thrust faults and continuous sedimentary cover.On the basis of 3D seismic data,and through sedimentary and structural research,the Micangshan foreland can be divided into five subbelts,which from north to south are:basement thrust,frontal thrust,foreland depression-back-thrust triangle,fore...     

A new kinematic evolutionary model for the growth of a duplex — an example from the Rangit duplex, Sikkim Himalaya, India

The Lesser Himalayan duplex (LHD) is a prominent structure through much of the Lesser Himalayan fold–thrust belt. In the Darjeeling - Sikkim Himalaya a component of the LHD is exposed in the Rangit window as the Rangit duplex (RD). The RD consists of ten horses of the upper Lesser Himalayan Sequence (Gondwana, Buxa, Upper Daling). The duplex varies from hinterland-dipping in the north, through an antiformal stack in the middle to foreland-dipping in the south. The Ramgarh thrust (RT) is the roof thrust and, based on a balanced cross-section, the Main Himalayan Sole thrust is the floor thrust at a depth of ~ 10 km and with a dip of ~ 3.5° N.Retrodeformation suggests that the RD initiated as a foreland-dipping duplex with the Early Ramgarh thrust as the roof thrust and the RT as the floor thrust. The RT became the roof thrust during continued duplexing by a combination of footwall imbrication and concurrent RT reactivation. This kinematic history best explains the large translation of the overlying MCT sheets. The restoration suggests that RD shortening is ~ 125 km, and the original Gondwana basin extended ~ 142 km northward of its present northernmost exposures within the window.     

Structural Styles of Longmen Mountain Thrust Belt,SW China

Through field geological investigation and seismic interpretation of the Longmen (龙门) Mountain thrust belt, we summarized the following structural styles: thrust belt, fault-related fold (fault bend fold, fault propagation fold, and fault decollement fold), pop-up, triangle zone, duplex, superimposed fold, ductile deformation structures, reverse thrust fault, klippe, decollement structure,etc.. These structural styles have evident distribution characteristics; they had zonation and segmentation in plane. Th...     

基于离散事件方法的AFDX建模与仿真

采用了建模仿真的方法来分析航空电子全双工交换式以太网（AFDX,Avionics Full Duplex switched ethernet）协议．通过对AFDX协议的抽象,基于离散事件的建模方法,以基本的网络元素来抽象化网络中的端系统、交换机等设备,以离散事件来描述网络设备的行为,以此构建了AFDX网络模型,并依据模型实现了仿真．网络演算是一种理论计算AFDX最坏延迟界限的方法,将典型场景下仿真得到的结果与理论计算的结果进行比较,验证了模型．通过不同流量方案下仿真结果的对比,对AFDX进行了传输特性的分析．     

同时检测海洋贝类包纳米虫和派琴虫的双重TaqMan MGB探针实时荧光PCR方法

根据包纳米虫（Bonamia sp.）SSU rDNA和派琴虫（Perkinsus sp.）ITS rDNA的保守区序列,设计特异性引物和Taqman MGB探针,建立了同时检测上述两种贝类原虫的双重实时荧光PCR方法.该方法可检测到包纳米虫基因的446拷贝质粒,以及派琴虫基因的171拷贝质粒,具有较高的灵敏度.以10倍系列稀释的包纳米虫阳性标准品质粒和派琴虫阳性标准品质粒为模板,测得该方法的定量标准曲线相关系数分别为0.999和1.000,显示出很好的扩增效率.同时该方法与尼氏单孢子虫（Haplosporidium nelsoni）、沿岸单孢子虫（H.costale）等其他贝类原虫,以及副溶血性弧菌（Vibrio parahaemolyticus）、迟缓爱德华氏菌（Edwardsiella tarda）和鮰爱德华氏菌（E.ictaluri）等海水养殖常见致病菌之间无交叉反应,表现出较高的特异性.福建莆田的湄州湾、平海湾、兴化湾等地采集的296份贝类临床样本的检测证明,该方法是一种有效的快速检测鉴定上述2种贝类原虫的方法,具有良好的灵敏度和特异性,可广泛应用于海洋贝类原虫感染情况调查,以及贝类疫病检疫监控等领域.     

A preliminary study of NW Zhejiang foreland fold and thrust belt in Southeast China

The Upper Permian Dalong Formation (P₂d) and Changxing Formation (P₂C), and the Lower Triassic Zhengtang Formation (Tlz) are of deep-water turbidites. The sedimentary features of the NW Zhejiang are of SE-dipping passive continental margin from the Paleozoic to the early Triassic. Together with the foreland molasse basin during the late Triassic (T₃w), the tectonics of the NW Zhejiang is characterised by a tectogenesis which took place in the middle Triassic. From SE to NW, the structural style varies from multi-duplex, antiformal stack to imbricate fans, and then to Jura Mountain-type fold zone with fold-style varying gradually from large-scale tight fold to midscale chevron fold, then to cylindrical fold, reviewing a preliminary scenario of foreland fold and thrust belt. The space-distributed structures and the tectonic vergence indicate the significance of deformation in (T1-T₃). Project supported by the National Natural Science Foundation of China and Chinese Academy of Sciences.     

准噶尔南缘逆冲带多个逆冲断层同期活动的几何学证据

天山北缘为典型的大陆内部活动构造特征,发育准噶尔盆地南缘逆冲带,主要表现为新生代时期形成的多排平行山体的背斜和逆冲断层。野外地质考察、地表填图指出,第二排背斜带玛纳斯背斜和吐谷鲁背斜核部均发育一条逆冲断层,背斜北翼发育一条逆冲断层,并导致河流阶地变形和断层崖的形成。地震资料解释和钻井数据证实玛纳斯背斜和吐谷鲁背斜北翼和核部存在多条向北逆冲的断层,在这些背斜和南侧第一排构造清水河背斜和奇古背斜之间的向斜之下存在隐伏的东湾背斜。二维地震测网构造解释指出东湾背斜为同时活动的、叠置的双重逆冲构造,并造成玛纳斯背斜和吐谷鲁背斜浅层发育一系列无序叠瓦逆冲断层。野外观察和地震解释的生长地层和地层不整合分析证实,这些无序逆冲断层形成时间主要为中新世晚期,一直到第四纪西域组(Q_1x)和乌苏群(Q_2)时期和第四纪中晚期(Q_4)。我们提出准南地区多个逆冲断层同期活动模式不同于新逆冲断层向前陆方向扩展时,旧断层不活动的模式。同期逆冲作用模式展示由于深部有序逆冲作用形成的双重逆冲构造发育期间,同期活动的逆冲作用可在浅层地表形成一系列无序逆冲断层,类似于叠瓦扇逆冲断层。     

Layer-parallel faults, duplexes, imbricate thrusts and vein structures of the Miura Group: Keys to understanding the Izu fore-arc sediment accretion to the Honshu fore arc

Abstract The Miura Group (Miocene-Pliocene) of south-central Japan shows a number of unique lithological and structural features. The group is composed of volcanic arc-derived marine sediments, and those in the south of the Mineoka Tectonic Belt particularly show various kinds of complex structures such as layer-parallel faults, thrust duplexes, imbricate thrusts and vein structures, yet the degree of compaction of the sediments is still remarkably low. These structures involve deformations at a very early stage and at shallow depths. They arose shortly after sedimentation within the Izu fore arc, and continued during accretion to the Honshu fore arc. The deformational stages are classified here into three stages, the first comprises bedding-parallel faulting associated with gravitational sliding and sediment injection. The first vein structures formed during this stage in the Izu fore arc area. These structures are cut by features developed during the second and third stages: especially thrusting, including duplex and imbricate thrusts. This horizontal shortening occurred during the accretionary prism formation on the subduction plate boundary. The second vein structures formed during this stage in the accretionary prism formation. The origin of the vein structures was discussed both by field observation and laboratory experiments. The latter suggests earthquake origin and the formative process is explained in relation to the field evidence.     

祁连山北缘早白垩世榆木山逆冲推覆构造与油气远景

榆木山地处祁连山北缘与河西走廊南缘的盆山结合带,是青藏高原北缘高原隆升与扩展的关键构造带。野外地质调查与构造填图发现,祁连山北缘的榆木山地区发育大型逆冲推覆构造,逆冲推覆构造之下是被掩埋的、褶皱了的早白垩世早期沉积地层,并被随后的走滑断裂活动和走滑双重构造所改造。深地震反射和大地电磁剖面测量与解释的初步结果,验证了祁连山北缘断裂以北发育的逆冲推覆构造,榆木山北缘山系构成飞来峰构造,将早白垩世酒泉盆地的一个分支掩盖在前中生代地层之下。构造关系分析给出主期逆冲推覆作用的时限大致为早白垩世早期,反映了在新生代印度—亚洲碰撞之前存在一期强烈的晚中生代构造挤压事件。逆冲推覆构造之下发现白垩纪盆地油气显示,扩展了该地区油气前景。