scholarly journals The geological and geodynamic condition on the formation of the Dabashan thrust nappe structure: Based on FLAC numerical modelling

2016 ◽  
Vol 20 (4) ◽  
pp. 1 ◽  
Author(s):  
Xiaoning Zhang ◽  
Yunpeng Dong
Keyword(s):  
Late Triassic ◽  
Key Factors ◽  
North China Block ◽  
Plan View ◽  
Huangling Anticline ◽  
Two Stages ◽  
North And South ◽  
Geodynamic Condition ◽  
Plate Subduction ◽  
Intracontinental Orogeny

The Dabashan thrust nappe structure at the southern margin of the Qinling orogenic belt suffered at least two stages of evolution which are Late Triassic plate subduction collisional orogeny between North China block, Qinling micro-plate and Yangtze block followed by intracontinental orogeny since the Meso-Cenozoic. A prominent topography characteristic within the Dabashan area is a southwestward extrusive arc (Bashan Arc fault) that is one of key factors to understand the geodynamic condition of the Dabashan thrust nappe structure. In this work, two-dimensional plan-view models are constructed to simulate the collisional and intracontinental orogenic movements, and the factors that may control the formation of the Bashan Arc fault are analysed. The modelling results show that the compressive stress produced by the plates collision along both north and south boundaries is the main driving force. The dextral shearing derived from the inconsistent shape on the block margins is the main controller. Rigid tectonic units such as Bikou and Hanan-Micangshan terranes, Foping and Wudang domes, as well as Shennongjia-Huangling anticline also contribute as “anchor” effects. Additionally, the rheology properties of rock material in the Dabashan area affect the shape of the arc. Condición geológica y geodinámica para la formación estructural de la falla de cabalgamiento en las montañas Dabashan basada en el modelo numérico del software FLAC ResumenLa estructura de la falla de cabalgamiento de las montañas Dabashan en el margen sur del cinturón orogénico de Qinling sufrió por lo menos dos etapas de evolución, la colisión orogénica del Triásico Superior entre el bloque de la China del Norte, la microplaca de Qinling y el bloque Yangtze, y la orogénesis intracontinental desde el Meso-Cenozoico. Una característica topográfica prominente del área de Dabashan es un arco extrusivo (falla Arco de Bashan) hacia el suroeste, que es un factor determinante para entender la condición geodinámica de la falla de cabalgamiento en las montañas Dabashan. En este trabajo se construyeron modelos bidimensionales planos para simular los movimientos de colisión e intracontinental orogénicos y se analizaron los factores que podrían controlar la formación de la falla del Arco de Bashan. Los resultados del modelado muestran que el esfuerzo de compresión producido por las placas de colisión en los límites norte y sur es la principal fuerza impulsora de la falla. La principal controladora es la fuerza de cizallamiento dextral derivada de la forma inconsistente en los margenes del bloque. Las unidades tectónicas rígidas como los terrenos Bikou y Hanan- Micangshan, el domo Foping y Wudang, al igual que el anticlinal Shennongjia-Huangling tienen funciones de ancla. Adicionalmente, las propiedades reológicas del material rocoso en el área Dabashan afectan la forma del arco.

scholarly journals Detrital zircon provenance of the Late Triassic Songpan-Ganzi complex: Sedimentary record of collision of the North and South China blocks: Comment and Reply: REPLY

Geology ◽  
2006 ◽  
Vol 34 (1) ◽  
pp. e107-e108
Author(s):  
A. L. Weislogel ◽  
S. A. Graham ◽  
E. Z. Chang ◽  
J. L. Wooden ◽  
G. E. Gehrels ◽  
...  
Keyword(s):  
South China ◽  
Detrital Zircon ◽  
Late Triassic ◽  
Sedimentary Record ◽  
The North ◽  
North And South

Analysis of Trust Chain Transitivity in TCG

2012 ◽  
Vol 490-495 ◽  
pp. 2042-2046
Author(s):  
Ce Zhang ◽  
Gang Cui ◽  
Zhong Chuan Fu ◽  
Yong Dong Xu
Keyword(s):  
Trusted Computing ◽  
Key Factors ◽  
Loss Measurement ◽  
General Trust ◽  
Trust Chain ◽  
Trust Relation ◽  
Measurement Function ◽  
Chain Transitivity ◽  
Two Stages

Trust chain is fundamental technology of Trusted Computing facing many problems. This paper points out that trust chain is made of two stages, analyses different trust relation building mechanism of two stages, and also thinks and proves that trust loss during trust transitivity process comes from composition loss and so on, describes behavior of trust chain transitivity quantitatively. After discussing key factors affect the trust, this paper defines the general trust transitivity model and trust loss measurement function, and discusses trust loss of Stage1 in TCG.

scholarly journals The Mesozoic Tectonic Dynamics and Chronology in the Eastern North China Block

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Quanlin Hou ◽  
Qing Liu ◽  
Hongyuan Zhang ◽  
Xiaohui Zhang ◽  
Jun Li
Keyword(s):  
North China ◽  
Late Triassic ◽  
Upper Crust ◽  
North China Block ◽  
Late Mesozoic ◽  
Detachment Faults ◽  
The North ◽  
North Part ◽  
Strong Compression ◽  
Tectonic System

Mesozoic tectonic events in different areas of the eastern North China Block (NCB) show consistency in tectonic time and genesis. The Triassic collision between NCB and Yangtze results in the nearly S-N strong compression in the Dabie, Jiaodong, and west Shandong areas in Middle Triassic-Middle Jurassic. Compression in the Yanshan area in the north part of NCB was mainly affected by the collision between Mongolia Block and NCB, as well as Siberia Block and North China-Mongolia Block in Late Triassic-Late Jurassic. However, in the eastern NCB, compressive tectonic system in Early Mesozoic was inversed into extensional tectonic system in Late Mesozoic. The extension in Late Mesozoic at upper crust mainly exhibits as extensional detachment faults and metamorphic core complex (MCC). The deformation age of extensional detachment faults is peaking at 120–110 Ma in Yanshan area and at 130–110 Ma in the Dabie area. In the Jiaodong area eastern to the Tan-Lu faults, the compression thrust had been continuing to Late Mesozoic at least in upper crust related to the sinistral strike slipping of the Tan-Lu fault zone.The extensional detachments in the eastern NCB would be caused by strong crust-mantle action with upwelling mantle in Late Mesozoic.

scholarly journals Supplemental Material: Syn-exhumation magmatism in an active continental margin above a continental subduction zone: Evidence from Late Triassic mafic igneous rocks in the southeastern North China Block

2020 ◽  
Author(s):  
Wei Fang ◽  
Li-Qun Dai
Keyword(s):  
Trace Element ◽  
Subduction Zone ◽  
Continental Margin ◽  
North China ◽  
Active Continental Margin ◽  
Hf Isotope ◽  
Igneous Rocks ◽  
Late Triassic ◽  
North China Block ◽  
Pb Isotope

Table S1: Major and trace element compositions of mafic igneous rocks from the southeastern North China Block; Table S2: Whole-rock Rb-Sr, Sm-Nd, and Lu-Hf isotope compositions of mafic igneous rocks from the southeastern North China Block; Table S3: LA-ICPMS zircon U-Pb isotope compositions of mafic igneous rocks from the southeastern North China Block; Table S4: Zircon LA-MC-ICPMS Lu-Hf and SIMS O isotopic compositions of mafic igneous rocks from the southeastern North China Block.

scholarly journals Analysis on Cognitive Behaviors and Prevention of Human Errors of Coalmine Hoist Drivers

2020 ◽  
Vol 10 (5) ◽  
pp. 663-670
Author(s):  
Pengye Zhu ◽  
Linhui Sun ◽  
Yunfeng Song ◽  
Liao Wang ◽  
Xiaofang Yuan ◽  
...  
Keyword(s):  
Cognitive Process ◽  
Process Model ◽  
Cognitive Errors ◽  
Key Factors ◽  
Analytic Hierarchy ◽  
Human Errors ◽  
Factors Affecting ◽  
Cognitive Behaviors ◽  
Two Stages ◽  
Hierarchy Process

Human errors are commonplace among hoist drivers in the hoisting task of coalmines. To reduce these errors and prevent accidents, it is necessary to identify the features of cognitive behaviors and main cognitive errors of the hoist drivers. This paper analyzes the accident cases and operating flow of coalmine hoist, and establishes a cognitive process model of coalmine hoist drivers. Further, the cognitive behaviors and functions of the drivers were analyzed stage by stage, revealing the distributions of their main cognitive behaviors and functions. It is learned that most coalmine hoist accidents concentrate in two stages: lifting, and operation monitoring. The operating processes in the two stages were further deliberated. The specific operations were extracted as the influencing factors of human errors, and the importance of each index was calculated through analytic hierarchy process (AHP). The research results provide a theoretical reference for identifying the key factors affecting the human errors of the operations by coalmine hoist drivers, and shed new light on how to prevent such errors.

Effects of a Threat and Alliance on International Cooperation: Comparison of Inter-Korean and Turkish-Armenian Railway Projects

2021 ◽  
Vol 23 (2) ◽  
pp. 225-232
Author(s):  
Yongsung Cho
Keyword(s):  
South Korea ◽  
International Cooperation ◽  
The United States ◽  
Diplomatic Relations ◽  
Infrastructure Projects ◽  
Key Factors ◽  
Independent Variables ◽  
Railway Line ◽  
Cross Border ◽  
North And South

The article examines restricting factors in international cooperation, drawing a comparative analysis of two cases on cross-border infrastructure projects: the Gyeongui railway line that connects North and South Korea and the Kars-Gyumri-Tbilisi railway line that links Turkey and Armenia. In both cases, states involved strive for the normalization of diplomatic relations and border openness as well as potential economic opportunities and national security. Nevertheless, neither Seoul and Pyongyang nor Ankara and Yerevan succeeded in building a sustainable cooperation framework. While the outcome is the same, independent variables in both cases are different. Firstly, two Koreas have been in a military confrontation for seven decades, whereas Turkey and Armenia never engaged in a direct conflict. Secondly, the configuration of alliances (South Korea and the United States and Turkey and Azerbaijan) weakens the decision-making on the troublesome infrastructure projects. Consequently, alliances are identified as one the key factors that determine the mode of international cooperation.

Atlantic Seafaring

2012 ◽  
Author(s):  
N. A. M. Rodger
Keyword(s):  
Fifteenth Century ◽  
Atlantic World ◽  
South Atlantic ◽  
Atlantic History ◽  
The North ◽  
Celestial Navigation ◽  
Basic Facts ◽  
Two Stages ◽  
North And South ◽  
Current Systems

Without the ocean — or rather, the two oceans, the North and South Atlantic — we cannot account for many of the basic facts of Atlantic history. Only ships and seafaring made possible the construction of the Atlantic world. Two stages in the making of the Atlantic world need to be distinguished; the age of exploration, when the geography of the two oceans was yet to be determined, and the age of exploitation which followed. Besides knowledge of celestial navigation and the wind systems, there was one further key element of the Atlantic navigation system which was developed in the fifteenth century: the three-masted ship rig. Just as the wind and current systems favoured the Spaniards in the Caribbean, they favoured the Portuguese in the South Atlantic Ocean. The study of Atlantic navigation raises as many questions as it answers. It seems to account for the early success of Portugal and Spain, but also seems to make almost impossible the rise to prominence in international trade of such remote and unfavoured ports as London and Amsterdam.

Palaeomagnetism, North China and South China collision, and the Tan-Lu fault

1990 ◽  
Vol 331 (1620) ◽  
pp. 589-598 ◽  
Keyword(s):  
South China ◽  
North China ◽  
Eastern China ◽  
Early Jurassic ◽  
Late Triassic ◽  
Polar Wander ◽  
The North ◽  
Indosinian Orogeny ◽  
North And South ◽  
Transcurrent Faults

Refined Apparent Polar Wander (APW) paths for the North and South China Blocks (ncb and scb) are presented and the collision between the NCB and SCB discussed. We suggest that the amalgamation of the NCB and SCB was completed in the late Triassic-early Jurassic, during the Indosinian Orogeny. This proposed timing is based on an analysis of palaeomagnetic signatures relating to continental collisions, such as the convergence of palaeolatitude, deflections of declination, hairpin-like loops in and superposition of APW paths. Like the Cenozoic India—Eurasia collision, the Mesozoic NCB- SCB collision reactivated ancient faults in eastern China, converting some of them into transcurrent faults, of which the Tan-Lu fault is the most famous.

scholarly journals Supplemental Material: Syn-exhumation magmatism in an active continental margin above a continental subduction zone: Evidence from Late Triassic mafic igneous rocks in the southeastern North China Block

2020 ◽  
Author(s):  
Wei Fang ◽  
Li-Qun Dai
Keyword(s):  
Trace Element ◽  
Subduction Zone ◽  
Continental Margin ◽  
North China ◽  
Active Continental Margin ◽  
Hf Isotope ◽  
Igneous Rocks ◽  
Late Triassic ◽  
North China Block ◽  
Pb Isotope

Table S1: Major and trace element compositions of mafic igneous rocks from the southeastern North China Block; Table S2: Whole-rock Rb-Sr, Sm-Nd, and Lu-Hf isotope compositions of mafic igneous rocks from the southeastern North China Block; Table S3: LA-ICPMS zircon U-Pb isotope compositions of mafic igneous rocks from the southeastern North China Block; Table S4: Zircon LA-MC-ICPMS Lu-Hf and SIMS O isotopic compositions of mafic igneous rocks from the southeastern North China Block.

Provenance of Carboniferous strata (the Meishan Group) on the northern margin of the Dabie orogenic belt and implications of oblique convergence between the North and South China blocks

2021 ◽  
Vol 91 (9) ◽  
pp. 1010-1023
Author(s):  
Cheng Cheng ◽  
Shuangying Li ◽  
Xiangyang Xie ◽  
Yanlin Lu ◽  
Arthur B. Busbey ◽  
...  
Keyword(s):  
South China ◽  
Orogenic Belt ◽  
South China Block ◽  
The South ◽  
North China Block ◽  
Northern Margin ◽  
The North ◽  
Dabie Orogenic Belt ◽  
Oblique Convergence ◽  
North And South

ABSTRACT The newly defined Carboniferous Meishan Group, along the northern margin of the Dabie orogenic belt, provides unique opportunities to document the poorly understood Paleozoic tectonic evolution of the Dabie orogenic belt and the Paleozoic convergence between the North and South China blocks. We apply sandstone petrology, geochemistry, and U-Pb detrital-zircon geochronology to constrain the provenance of the Carboniferous Meishan Group and to document its potential tectonic significance. We conclude that the Meishan Group received most sediment directly from early Paleozoic continental island arc rocks that are currently missing in the Dabie orogenic belt, with minor contributions from middle Neoproterozoic magmatic rocks of the South China Block and recycling of Archean to Proterozoic basement rocks of both the North and South China blocks. Compilation and comparison of detrital zircons and geochemistry data of the Silurian–Devonian and Carboniferous units suggests that all of them share similar source areas, but that individual contributions from each source were different. These results support the hypothesis that the Dabie orogenic belt developed a similar Paleozoic accretionary system, and shares a similar tectonic history, with the Qinling orogenic belt. These provenance patterns can be explained by a model of oblique convergence between the North and South China blocks during the Paleozoic. The South China Block was obliquely subducted beneath the North China Block with its opening to the east, forming an eastward-widening sedimentary basin. As a result, the eastern part of the basin received more sediment from the northern passive margin of the South China Block, while the western part of the basin received more material from the southern active margin of the North China Block.

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