scholarly journals The Tell-Rif orogenic system (Morocco, Algeria, Tunisia) and the structural heritage of the southern Tethys margin

2018 ◽  
Vol 189 (2) ◽  
pp. 10 ◽  
Author(s):  
Rémi Leprêtre ◽  
Dominique Frizon de Lamotte ◽  
Violaine Combier ◽  
Oriol Gimeno-Vives ◽  
Geoffroy Mohn ◽  
...  
Keyword(s):  
Large Scale ◽  
Lateral Spreading ◽  
Direct Result ◽  
Deep Basin ◽  
The West ◽  
The North ◽  
Slab Tearing ◽  
Geodynamic Models ◽  
Back Arc ◽  
Central Atlantic

The Tell-Rif (Tell in Algeria and Tunisia; Rif in Morocco) is the orogenic system fringing to the south the West Mediterranean basins. This system comprises three major tectonic-palaeogeographic zones from north to south: (1) the internal zones (AlKaPeCa for Alboran, Kabylies, Peloritan, Calabria) originating from the former northern European margin of the Maghrebian Tethys, (2) the “Flyschs zone” regarded as the former cover of the oceanic domain and (3) the external zones, forming the former southern Maghrebian Tethys margin more or less inverted. The Tell-Rif is interpreted as the direct result of the progressive closure of the Maghrebian Tethys until the collision between AlKaPeCa and Africa and, subsequently, the propagation of the deformation within Africa. This gives a consistent explanation for the offshore Neogene geodynamics and most authors share this simple scenario. Nevertheless, the current geodynamic models do not completely integrate the Tell-Rif geology. Based on the analysis of surface and sub-surface data, we propose a reappraisal of its present-day geometry in terms of geodynamic evolution. We highlight its non-cylindrical nature resulting from both the Mesozoic inheritance and the conditions of the tectonic inversion. During the Early Jurassic, we emphasize the development of NE-SW basins preceding the establishment of an E-W transform corridor connecting the Central Atlantic Ocean with the Ligurian Tethys. The Maghrebian Tethys developed just after, as the result of the Late Jurassic-Early Cretaceous left-lateral spreading between Africa and Iberia. By the Late Cretaceous, the occurrence of several tectonic events is related to the progressive convergence convergence between the two continents. A major pre-Oligocene (pre-35 Ma) compressional event is recorded in the Tell-Rif system. The existence of HP-LT metamorphic rocks associated with fragments of mantle in the External Metamorphic Massifs of the Eastern Rif and Western Tell shows that, at that time, the western part of the North-African margin was involved in a subduction below a deep basin belonging to the Maghrebian Tethys. At the same time, the closure of the West Ligurian Tethys through east-verging subduction led to a shift of the subduction, which jumped to the other side of AlKaPeCa involving both East Ligurian and Maghrebian Tethys. Slab rollback led to the development of the Oligo-Miocene back-arc basins of the West-Mediterranean, reworking the previous West Ligurian Tethys suture. The docking of AlKaPeCa against Africa occurred during the Late Burdigalian (17 Ma). Subsequently, the slab tearing triggered westward and eastward lateral movements that are responsible for the formation of the Gibraltar and Tyrrhenian Arcs respectively. The exhumation of the External Metamorphic Massifs occurred through tectonic underplating during the westward translation of the Alboran Domain. It resulted in the formation of both foredeep and wedge-top basins younger and younger westward. The lack of these elements in the eastern part of the systems signs a different evolution dominated by frontal accretion. In the discussion, we precisely address the origin of the non-cylindrical behavior of the orogenic system and question the mechanisms explaining at large scale the phases of coupling/uncoupling between the major plates.

Structural and metamorphic relationships between the Mount Ida and Monashee Groups at Mara Lake, British Columbia

1982 ◽  
Vol 19 (2) ◽  
pp. 288-307 ◽  
Author(s):  
Kent C. Nielsen
Keyword(s):  
British Columbia ◽  
Large Scale ◽  
Ductile Deformation ◽  
Late Triassic ◽  
Second Phase ◽  
The West ◽  
Late Mesozoic ◽  
The North ◽  
Phase Deformation ◽  
Metamorphic Core

Mara Lake, British Columbia straddles the boundary between the Monashee Group on the east and the Mount Ida Group on the west. Correlation of units across the southern end of Mara Lake indicates lithologic continuity between parts of the groups. Both groups have experienced four phases of deformation. Phases one and two are tight and recumbent, trending to the north and to the west, respectively. Phases three and four are open to closed and upright, trending northwest and northeast, respectively. Second-phase deformation includes large-scale tectonic slides that separate areas of consistent vergence. Slide surfaces are folded by third- and fourth-phase structures and outline domal outcrop patterns. Metamorphic grade increases from north to south along the west side of Mara Lake. Calc-silicate reactions involving the formation of diopside are characteristic. From west to east increasing grade is evident in the reaction of muscovite + quartz producing sillimanite + K-feldspar + water. These prograde reactions are related to relative position in the second-phase structure. The highest grade is located near the lowest slide surface. Greenschist conditions accompanied phase-three deformation. Fourth phase is characterized by hydrothermal alteration, brittle fracturing, and local faulting. First-phase deformation appears to be pre-Late Triassic whereas second and third phases are post-Late Triassic and pre-Cretaceous. The fourth phase is part of a regional Tertiary event. The third folding event is correlated with the development of the Chase antiform and the second-phase folding is related to the pervasive east–west fabric of the Shuswap Complex. The timing of these events indicates that the metamorphic core zone of the eastern Cordillera was relatively rigid during the late Mesozoic foreland thrust development. Ductile deformation significantly preceded thrusting and developed a fabric almost at right angles to the trend of the thrust belt.

The Dabona Cemetery in Xiangyun County, Yunnan

2016 ◽  
Vol 16 (1) ◽  
pp. 13-26
Keyword(s):  
Large Scale ◽  
Erhai Lake ◽  
Warring States Period ◽  
Social Situations ◽  
The West ◽  
Warring States ◽  
The North ◽  
Lake Region ◽  
The People ◽  
The Social

Abstract In 2014, Yunnan Provincial Institute of Cultural Relics and Archaeology and other institutions conducted large-scale excavation to the Dabona Cemetery located in Dabona Village and to its east of the Liuchang Town, Xiangyun County. The west zone of the Dabona Cemetery had widely distributed early cultural remains, including house foundations, postholes, ash pits, ash ditches, etc. The east zone consisted of two sections distributed in the north-south direction, in the north section of which 25 burials were recovered; among these burials, six were large-sized ones with lengths more than 6m, and the other were medium- and small-sized burials. The grave goods unearthed from these burials reflected that the dates of the remains and burials were roughly in the Warring-States Period to the Qin and Han Dynasties. The area where these remains and burials were located was the main inhabited area of the people of Kunming ethnic group; this excavation provided important materials for the researches on the features and the social situations of the bronze cultures in the Erhai Lake region.

Building Domestic Support for West Germany's Integration into NATO, 1953–1955

2020 ◽  
Vol 22 (2) ◽  
pp. 133-162
Author(s):  
Jan Uelzmann
Keyword(s):  
Public Relations ◽  
Large Scale ◽  
Federal Republic Of Germany ◽  
Lower Saxony ◽  
The West ◽  
The North ◽  
Public Sentiment ◽  
Competing Events ◽  
The Government ◽  
Domestic Support

Konrad Adenauer's government in the Federal Republic of Germany (FRG) engaged in a large-scale media campaign to create political consent for the FRG's integration into the West, a policy that rested to a large extent on rearmament and entry into the North Atlantic Treaty Organization. To counter public criticism of rearmament, the West German authorities used Mobilwerbung, a company that maintained a fleet of mobile film screening vans. Clandestinely financed by the government, Mobilwerbung brought government-commissioned films and political speakers into the FRG's remotest areas. Based on archival records on deployments in Lower Saxony and North Rhine-Westphalia, this article traces Mobilwerbung's role as a government unit that reacted dynamically to competing events. Through highly detailed reporting on audience reactions, Mobilwerbung served both as a public relations vehicle to foster consent and as an analytical tool that allowed the mapping of public sentiment regarding rearmament.

Recent tectonic reorganization of the Nubia-Eurasia convergent boundary heading for the closure of the western Mediterranean

2011 ◽  
Vol 182 (4) ◽  
pp. 279-303 ◽  
Author(s):  
Andrea Billi ◽  
Claudio Faccenna ◽  
Olivier Bellier ◽  
Liliana Minelli ◽  
Giancarlo Neri ◽  
...  
Keyword(s):  
Subduction Zone ◽  
Mediterranean Area ◽  
Western Mediterranean ◽  
Small Scale ◽  
The West ◽  
Seismic Reflection Data ◽  
Basin Inversion ◽  
The North ◽  
Reflection Data ◽  
Back Arc

Abstract In the western Mediterranean area, after a long period (late Paleogene-Neogene) of Nubian (W-Africa) northward subduction beneath Eurasia, subduction has almost ceased, as well as convergence accommodation in the subduction zone. With the progression of Nubia-Eurasia convergence, a tectonic reorganization is therefore necessary to accommodate future contraction. Previously-published tectonic, seismological, geodetic, tomographic, and seismic reflection data (integrated by some new GPS velocity data) are reviewed to understand the reorganization of the convergent boundary in the western Mediterranean. Between northern Morocco, to the west, and northern Sicily, to the east, contractional deformation has shifted from the former subduction zone to the margins of the two back-arc oceanic basins (Algerian-Liguro-Provençal and Tyrrhenian basins) and it is now mainly active in the south-Tyrrhenian (northern Sicily), northern Liguro-Provençal, Algerian, and Alboran (partly) margins. Onset of compression and basin inversion has propagated in a scissor-like manner from the Alboran (c. 8 Ma) to the Tyrrhenian (younger than c. 2 Ma) basins following a similar propagation of the cessation of the subduction, i.e., older to the west and younger to the east. It follows that basin inversion is rather advanced on the Algerian margin, where a new southward subduction seems to be in its very infant stage, while it has still to really start in the Tyrrhenian margin, where contraction has resumed at the rear of the fold-thrust belt and may soon invert the Marsili oceanic basin. Part of the contractional deformation may have shifted toward the north in the Liguro-Provençal basin possibly because of its weak rheological properties compared with those of the area between Tunisia and Sardinia, where no oceanic crust occurs and seismic deformation is absent or limited. The tectonic reorganization of the Nubia-Eurasia boundary in the study area is still strongly controlled by the inherited tectonic fabric and rheological attributes, which are strongly heterogeneous along the boundary. These features prevent, at present, the development of long and continuous thrust faults. In an extreme and approximate synthesis, the evolution of the western Mediterranean is inferred to follow a Wilson Cycle (at a small scale) with the following main steps : (1) northward Nubian subduction with Mediterranean back-arc extension (since ~35 Ma); (2) progressive cessation, from west to east, of Nubian main subduction (since ~15 Ma); (3) progressive onset of compression, from west to east, in the former back-arc domain and consequent basin inversion (since ~8–10 Ma); (4) possible future subduction of former back-arc basins.

scholarly journals A Preliminary Study: Marine Biogeography of Nautilus in the Bangka Belitung Seas, Indonesia

2021 ◽  
Vol 26 (3) ◽  
pp. 147-154
Author(s):  
Siti Aisyah ◽  
Josaphat Tetuko Sri Sumantyo ◽  
Aditya Pamungkas ◽  
M Rizza Muftiadi ◽  
Muh Yusuf
Keyword(s):  
Large Scale ◽  
Local Area ◽  
Limiting Factor ◽  
The West ◽  
Living Fossil ◽  
The North ◽  
Surface Temperatures ◽  
Special Cases ◽  
Original Habitat ◽  
West Monsoon

Nautilus is the only surviving genus whose members were numerous and widely dispersed in the oceans throughout the Jurassic and Miocene times. It represents the only living member from the Family Nautilidae and is often considered as a living fossil. Nautilus is found with high biodiversity in Ambon, Indonesia, and were in special cases even found in Bangka Belitung, far from their original habitat. This study aimed to understand the historical component of the habitat and distribution of Nautilus in Bangka Belitung and to determine the depth, temperature, current, and environmental heterogeneity relate to Nautilus. Nautilus samples were found in Bangka Belitung Seas nearby a crack region at 50–75 m deep while the optimal depth of the Nautilus was 150–300 m, depending on the local area. The locations in the Bangka Belitung Seas where Nautilus found have sea surface temperatures between 30-31°C and 27-28°C during the East Monsoon and the West Monsoon respectivelly. The implications of temperature as a limiting factor are fairly significant, as it restricts the upper limit of the living habitat to predictable depths, which vary both geographically and seasonally during the West Monsoon when surface temperatures approach habitable levels. Sea currents at the Bangka Belitung Seas move at 0–0.6 m.s-1 during the East Monsoon and speed up near the North Natuna Sea. During the West Monsoon, currents predominantly flow from the Natuna Sea to the Java Sea at 0–0.5 m.s-1. Large-scale deep-water currents and the effects of smaller currents on scent dispersal influence the directional movements of Nautilus.

scholarly journals Predicted the Cumulative Annual Rainfall in Iraq Using SDSM Modal

2021 ◽  
Vol 32 (2) ◽  
pp. 11
Author(s):  
Ali Mokhles Abdul-Jabbar ◽  
Asraa Khtan Abdulkareem
Keyword(s):  
Large Scale ◽  
Daily Rainfall ◽  
Local Scale ◽  
Annual Rainfall ◽  
Small Scale ◽  
Middle Region ◽  
The West ◽  
The North ◽  
West Region ◽  
The World

Rain is deemed one of the most important climate elements. It must be given special attention for being the basis without which no kind of life in the world can be there. the aim of the study is to use Statistical models Downscaling (SDSM) where it is a universal model used to converting large scale output into a small scale that can be used to study impact at the local scale (Iraq)' to Forecasting cumulative annual rainfall for the next years where there are a few studies used this model in Iraq. Daily rainfall data from the Iraqi Meteorological Organization and Seismology (IMOS) (2007-2016) for the study areas (Baghdad, Karbala, Al-Hay, Mosul, Kirkuk, Khanaqin, Basra, Nasiriya, Diwaniya, and Rutba) is used to estimate the amount of rainfall by using SDSM. The model was used to estimate the rain values and then the results were compared with the actual values, the results were very close to each other. Also, the model used to predict the cumulative annual rainfall from (2017-2021), The result shows that the bigger amount of rainfall in the north region with (3821) mm and the lowest amount in the west region (665) mm, while middle region (1848) mm and south region (1828) mm.

The Remains of Liangzhu Culture at Jiangzhuang Site in Xinghua and Dongtai Cities, Jiangsu

2017 ◽  
Vol 17 (1) ◽  
pp. 18-31
Keyword(s):  
Yangtze River ◽  
Large Scale ◽  
New Materials ◽  
The West ◽  
Academic Field ◽  
The North ◽  
Main Work ◽  
The People ◽  
Water Wells ◽  
Liangzhu Culture

AbstractIn October 2011 to December 2015, the Institute of Archaeology, Nanjing Museum conducted two terms of excavations to the Jiangzhuang Site located in the administrated areas of Xinghua and Dongtai Cities, Jiangsu Province. The main work was the large-scale uncovering of the settlement of the Liangzhu Culture located in the west zone of the site, the features recovered from which included burials, house foundations, ash pits, water wells, ash ditches, etc. In the cemetery of the Liangzhu Culture in the northeast of the west zone of the site, burials were densely arranged; most of the burials had burial receptacles, and the skeletons were well preserved, the burial positions of which included primary burials and secondary burials. The discovery and excavation of the settlement of Liangzhu Culture at Jiangzhuang Site revised the traditional viewpoint of the academic field that the north border of the Liangzhu Culture was limited by the Yangtze River and provided new materials for the comprehensive and in-depth researches on the civilization and society of the Liangzhu Culture. The large amount of human skeletons unearthed from the burials of the Liangzhu Culture will also effectively improve the indepth researches on the burial custom, social organization and relationship and racial attribution of the people of Liangzhu Culture.

scholarly journals Analisis Trafik Pengguna XL Axiata Jakarta Selama Pandemi Covid-19 dengan Menggunakan Metode Regresi Linier

2021 ◽  
Vol 2 (1) ◽  
pp. 24-32
Author(s):  
Diana Dyah Damayanti ◽  
Theresiawati ◽  
Kraugusteeliana
Keyword(s):  
Linear Regression ◽  
Data Processing ◽  
Large Scale ◽  
Traffic Data ◽  
Mining Method ◽  
The West ◽  
The North ◽  
Processing Data ◽  
Regression Techniques ◽  
At Home

2020 is a very disturbing year for the whole world because in 2020 there is a deadly virus, the virus is called Covid-19. The Indonesian government has a strategy to deal with the Covid-19 virus, namely by implementing Large-Scale Social Restrictions (PSBB). Where the implementation of this PSBB requires residents to do more activities at home. To carry out activities at home, internet access is needed. Therefore, providers are the companies that benefit the most, providers are companies that provide internet services, one of which is XL Axiata. During the Covid-19 pandemic, XL Axiata company wants to conduct analysis for XL Axiata in the next year, whether the traffic of XL Axiata users has increased or decreased and how many devices need to be upgraded or safe. In conducting this analysis, it is necessary to perform fast data processing, data processing using the Data Mining method with Linear Regression techniques. The data to be processed will be obtained from the XL Axiata company, namely XL Axiata traffic data. By processing data using Linear Regression results in future predictions, the West Jakarta Municipality has increased per week by an average of 0.12%, the East Jakarta Municipality has decreased per week by an average of 0.27%, the Central Jakarta Municipality experiences the decline per week by an average of 2.31%, the South Jakarta Municipality experienced an increase per week by an average of 1.17%, and in the North Jakarta Municipality it decreased per week by an average of 0.12%.  

scholarly journals Origin and Route of Severe Dust Storms in West Asia (with Horizontal Visibility Less Than 1000 Meters)

2021 ◽  
Author(s):  
zainab Mohammadi ◽  
hassan lashkari
Keyword(s):  
Large Scale ◽  
Temporal Distribution ◽  
Middle Layer ◽  
Dust Storms ◽  
The West ◽  
Horizontal Visibility ◽  
Northwestern Saudi Arabia ◽  
The North ◽  
South Of Iraq ◽  
Annual Distribution

Abstract Storms are intensified atmospheric phenomena which are sometimes accompanied by heavy rainfall and sometimes by dust. Dust storms, especially storms with horizontal visibility of fewer than 1000 meters, have always been harmful and detrimental to human comfort and health. In recent decades, the worrisome phenomena of conflict, climate change, and droughts have increased the frequency of dust storms in West Asia. Identifying the source and route of dust storms is the first step in limiting the harm they inflict. To investigate this phenomenon, using the daily data of the Meteorological Organization of Iran, storms with horizontal visibility of less than 1000 meters in the southwestern region of Iran, as one of the destination areas of these storms, in a statistical period of 33 years (1987 to 2019) was extracted. First, the monthly, seasonal and annual distribution of dust storms in 13 synoptic stations in this area was investigated. Then, using the site https://www.ready.noaa.gov/HYSPLIT by backward method from the GDAS data system with a step of 0.5 degrees, the origin and path of the storms were identified. Finally, maps of each route were drawn in ArcGIS 10.6. The findings of this study revealed that the biggest number of dust storms occurred in the winter, in terms of temporal distribution (38% of storms). With 23% of storms, spring is in second position. In terms of monthly distribution, the month of January has the most storms, followed by February and December. Storms decrease in intensity as they move from the south to the north, and from the west to the east of the region. The central region of Iraq ranks first in terms of storm origin, accounting for 25% of all storms. If dust storms originating in western Iraq are added to this number, about 35% of storms in west Asia originate in western and central Iraq. Regarding the pattern of large-scale atmospheric circulation prevailing in the middle layer of the atmosphere in this region, most of these dust storms in the west-east direction, after passing through the center and south of Iraq, enter Iran. The study also shows that storms in Syria، Jordan or northwestern Saudi Arabia, are very thick. These storms cover the middle layer of the troposphere and then affect high stations such as Shahrekord and Yasuj with an altitude of more than 2000 meters.

Why Has There Been No People’s Power Rebellion in North Korea?

2018 ◽  
pp. 1-34
Author(s):  
Andrew Jackson
Keyword(s):  
Rural Areas ◽  
North Korea ◽  
Large Scale ◽  
Political Elite ◽  
Information Control ◽  
Al Jazeera ◽  
The North ◽  
New Information ◽  
Effective System ◽  
The Right

One scenario put forward by researchers, political commentators and journalists for the collapse of North Korea has been a People’s Power (or popular) rebellion. This paper analyses why no popular rebellion has occurred in the DPRK under Kim Jong Un. It challenges the assumption that popular rebellion would happen because of widespread anger caused by a greater awareness of superior economic conditions outside the DPRK. Using Jack Goldstone’s theoretical expla-nations for the outbreak of popular rebellion, and comparisons with the 1989 Romanian and 2010–11 Tunisian transitions, this paper argues that marketi-zation has led to a loosening of state ideological control and to an influx of infor-mation about conditions in the outside world. However, unlike the Tunisian transitions—in which a new information context shaped by social media, the Al-Jazeera network and an experience of protest helped create a sense of pan-Arab solidarity amongst Tunisians resisting their government—there has been no similar ideology unifying North Koreans against their regime. There is evidence of discontent in market unrest in the DPRK, although protests between 2011 and the present have mostly been in defense of the right of people to support themselves through private trade. North Koreans believe this right has been guaranteed, or at least tacitly condoned, by the Kim Jong Un government. There has not been any large-scale explosion of popular anger because the state has not attempted to crush market activities outright under Kim Jong Un. There are other reasons why no popular rebellion has occurred in the North. Unlike Tunisia, the DPRK lacks a dissident political elite capable of leading an opposition movement, and unlike Romania, the DPRK authorities have shown some flexibility in their anti-dissent strategies, taking a more tolerant approach to protests against economic issues. Reduced levels of violence during periods of unrest and an effective system of information control may have helped restrict the expansion of unrest beyond rural areas.

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