scholarly journals Geology and constituent rocks of the Chungju-Goesan area in the northwestern part of Ogcheon metamorphic zone, Korea: Considering on the history of igneous activities accompanying formation and evolution processes of the Ogcheon rift basin

2017 ◽  
Vol 53 (1) ◽  
pp. 51-77 ◽  
Author(s):  
Ji-Hoon Kang ◽  
Deok-Seon Lee ◽  
Sin-Young Noh ◽  
Jin-Woo Jeong ◽  
Sang-Mo Koh
2019 ◽  
Vol 4 (3) ◽  
pp. 208-212
Author(s):  
JAAP EVERT ABRAHAMSE ◽  
MENNE KOSIAN

‘Sluisbuurt’ Amsterdam: world heritage and high-rise buildings On the northwestern part of the Zeeburgereiland, an island in the IJ, the municipality of Amsterdam is developing the Sluisbuurt quarter: a mixed-use neighbourhood with shops, offices, catering and education and no less than 5,500 residential units, some of which are high-rise. The Sluisbuurt soon proved controversial because of the visibility of the towers from the Amsterdam city centre and from the rural area around Waterland. In this article we discuss the planning and the history of the island.


Author(s):  
Mauro D’Onofrio ◽  
Paola Marziani ◽  
Cesare Chiosi

We review the properties of the established Scaling Relations (SRs) of galaxies and active galactic nuclei (AGN), focusing on their origin and expected evolution back in time, providing a short history of the most important progresses obtained up to now and discussing the possible future studies. We also try to connect the observed SRs with the physical mechanisms behind them, examining to what extent current models reproduce the observational data. The emerging picture clarifies the complexity intrinsic to the galaxy formation and evolution process as well as the basic uncertainties still affecting our knowledge of the AGN phenomenon. At the same time, however, it suggests that the detailed analysis of the SRs can profitably contribute to our understanding of galaxies and AGN.


2015 ◽  
Vol 52 (7) ◽  
pp. 444-465 ◽  
Author(s):  
Christopher R.M. McFarlane

The Matthew Creek Metamorphic Zone (MCMZ) exposes what is inferred to be the lowest structural level of the lower Aldridge Formation in the Canadian portion of the Belt–Purcell Supergroup. Zircon, monazite, and titanite were dated using the U–Pb system by LA–ICP–MS. The detrital zircon populations of quartzite layers in these rocks define a provenance dominated by sources of Laurentian affinity with a minor component of non-North American ages between 1600 and 1490 Ma. Special attention was paid to monazite in sillimanite-grade metapelitic schists that was analyzed using in situ LA–ICP–MS techniques guided by BSE imaging and compositional mapping. Textural and geochronological evidence indicate that coupled dissolution–reprecipitation affected detrital monazite at 1413 ± 10 Ma. This was followed by prograde monazite growth at 1365 ± 10 Ma, synchronous with crystallization of the nearby Hellroaring Creek peraluminous granite at 1365 ± 5 Ma. Late-stage pegmatite emplacement and ductile shearing along the contact of the MCMZ and overlying rocks occurred at 1335 ± 5 Ma, interpreted as a period of post-collisional extension, core complex formation, exhumation, and decompression melting. The entire package was subsequently affected by a pervasive ∼1050 Ma hydrothermal overprint that partially reset U–Pb dates in monazite, zircon, and titanite contained in all lithologies examined. The lowermost Belt–Purcell stratigraphy in southeast British Columbia preserves a detailed record of sedimentary provenance and a long history of episodic collision and extension that must be reconciled with plate reconstruction models for the break-up of the Nuna supercontinent and assembly of Rodinia.


Kavkazologiya ◽  
2021 ◽  
pp. 219-288
Author(s):  
M.A. KHAKUASHEVA ◽  
◽  
L.B. KHAVZHOKOVA ◽  

The article examines some of the issues of the formation and evolution of the genre of the story in Circassian literature. The relevance of the study is due, on the one hand, to the insufficient development of the stated topic, on the other hand, to the need to identify trends in the development of national prose, starting from the problems of its genesis. In the center of research attention is the ideological and thematic orientation of the Circassian story mainly of the initial stage of evolution, i.e. Soviet era. In particular, the author examines the stories of S. Temirov, I. Amirokov, M. Adamokov, H. Gashokov and others, who laid the foundations of the genre in Circassian literature. During the indicated period, the Circassian tale was the first attempt to comprehend the problems of collective farms, youth brigades, the Soviet attitude to work, the range of urgent problems of young people, their aspirations, the formation of the criteria of Soviet morality. It also reflects various aspects of the Great Patriotic War, mainly as a war for independence. The research uses the method of artistic analysis. The results obtained can be used in compiling special courses on Adyghe (Kabardino-Circassian) prose, writing the history of the literature of the peoples of the North Caucasus.


2020 ◽  
Vol 896 (1) ◽  
pp. 14
Author(s):  
Doo Ri Han ◽  
Young Sun Lee ◽  
Young Kwang Kim ◽  
Timothy C. Beers

2019 ◽  
Vol 132 (3-4) ◽  
pp. 884-896 ◽  
Author(s):  
Manuel Roda ◽  
Michele Zucali ◽  
Alessandro Regorda ◽  
Maria Iole Spalla

Abstract In the Sesia-Lanzo Zone, Western Alps, the Rocca Canavese Thrust Sheets (RCT) subunit is characterized by a mixture of mantle- and crust-derived lithologies, such as metapelites, metagranitoids, metabasics, and serpentinized mantle slices with sizes ranging from meters to hundreds of meters. Structural and metamorphic history suggests that the RCT rocks experienced a complex evolution. In particular, two different peak conditions were obtained for the metabasics, representing different tectono-metamorphic units (TMUs), namely, D1a under eclogite facies conditions and D1b under lawsonite-blueschist-facies conditions. The two TMUs were coupled during the syn-D2 exhumation stage under epidote-blueschist-facies conditions. The different rocks and metamorphic evolutions and the abundance of serpentinites in the tectonic mixture suggest a possible subduction-related mélange origin for the RCT. To verify whether a subduction-related mélange can record tectono-metamorphic histories similar to that inferred for the RCT, we compare the pressure-temperature evolutions with the results of a 2-D numerical model of ocean-continent subduction with mantle wedge serpentinization. The predictions of the numerical model fully reproduce the two peak conditions (D1a and D1b) and the successive exhumation history of the two TMUs within the subduction wedge. The degree of mixing estimated from field data is consistent with that predicted by the numerical simulation. Finally, the present-day location of the RCT, which marks the boundary between the orogenic wedge (Penninic and Austroalpine domains) and the southern hinterland (Southalpine domain) of the Alpine chain, is reproduced by the model at the end of the exhumation in the subduction wedge. Therefore, the comparison between natural data and the model results confirms the interpretation of the RCT as a subduction-related mélange that occurred during exhumation within a serpentinized mantle wedge.


2015 ◽  
Vol 744-746 ◽  
pp. 407-412
Author(s):  
Ya Qun Liu ◽  
Hai Bo Li ◽  
Qi Tao Pei ◽  
Jing Sen Liu

In high mountain and deep river valley areas, geological materials of river valley evolution are often missing or incomplete. To address this problem, tectonic movements at project site are analyzed using mathematical statistics based on the analysis of formation and evolution history of river terraces, and then a new method to determine the thickness of river incision layers is proposed. Taking Jiata dam area at the Western Route of South-to-North Water Transfer Project in China for an example, the reliability and reasonability of the proposed method are validated through a case study.


Minerals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 794
Author(s):  
Wenxiao Zhou ◽  
Haiquan Li ◽  
Feng Chang ◽  
Xinbiao Lv

The early Paleozoic is a crucial period in the formation and evolution of the Eastern Kunlun Orogenic Belt (EKOB), and is of great significance for understanding the evolutionary history of the Proto-Tethyan Ocean. This paper presents new petrography, geochemistry, zircon U–Pb dating, and Lu–Hf isotopic research on the Yuejingshan gabbro from the eastern segment of the EKOB. Zircon U–Pb data suggests that the gabbro formed in the Early Silurian (435 ± 2 Ma). All samples have relatively low TiO2 contents (0.45–2.97%), widely varying MgO (6.58–8.41%) and Mg# (58–65) contents, and are rich in large ion lithophile elements (LILE such as Rb, Ba, Th, and U) and light rare earth elements (LREE). This indicates that it has a similar geochemical composition to island arc basalt. The major element features indicate that the formation of this gabbro underwent fractional crystallization of clinopyroxene, olivine, and plagioclase. The depletion of high field strength elements (HFSE, such as Nb, Ta, and Ti), and a slightly positive Hf isotope (with εHf(t) ranging from 1.13 to 2.45) may be related to the partial melting of spinel-bearing peridotite, led by slab fluid metasomatism. The gabbro likely represents magmatic records of the latest period of the early Paleozoic oceanic crust subduction in the Eastern Kunlun. Therefore, the final closure of the Proto-Tethyan Ocean and the beginning of collisional orogeny occurred before the Early Silurian.


2011 ◽  
Vol 7 (S282) ◽  
pp. 379-384 ◽  
Author(s):  
Simon Albrecht

AbstractIn this talk I will review the Rossiter-McLaughlin (RM) effect; its history, how it manifests itself during stellar eclipses and planetary transits, and the increasingly important role its measurements play in guiding our understanding of the formation and evolution of close binary stars and exoplanet systems.


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