Rb/Sr geochronology in the Thompson belt, Manitoba: implications for Aphebian crustal development and metallogenesis

1981 ◽  
Vol 18 (5) ◽  
pp. 932-943 ◽  
Author(s):  
C. Brooks ◽  
P. Theyer
Keyword(s):  
Broad Band ◽  
Early Period ◽  
Growth Trajectories ◽  
Isotopic Data ◽  
Depositional History ◽  
Sedimentary Sequences ◽  
Thompson Groups ◽  
Facies Metamorphism ◽  
History Of

The supracrustal metasediments of the Thompson belt (Pipe and Thompson Groups) show pronounced differences in Rb/Sr age (1855–1685 and 1665–1575 Ma, respectively) and initial Sr ratio (0.7096–0.7166 and 0.7203–0.7233). However, they have similar Rb/Sr ratios (0.8–1.2), and the age and isotopic differences are attributed to differing degrees of postdepositional, metamorphic reworking. The Sr-growth trajectories of these metasediments define a broad band on the evolution diagram and indicate a probable (maximum?) age of deposition of ca. 2.0 ± 0.1 Ga. Furthermore, the role of Archean detritus in the depositional history of these sediments is quite limited, based on isotopic data for the basement gneisses and adjoining granulites of the Pikwitonei region.Comparison of these data with those for metagraywackes of the adjacent Kisseynew gneisses (average [Formula: see text]) indicates that there were fundamental differences between the marine environments within which the two Aphebian sedimentary sequences were deposited. The high Rb/Sr in the Thompson belt metasediments is interpreted to reflect a relatively "long" equilibration of authigenic clays with circulating seawater (open ocean?) whereas the lower Rb/Sr of the Kisseynew metasediments reflects rapid sedimentation in an eugeosynclinal environment dominated by juvenile Aphebian material.Combined K/Ar and Rb/Sr ages suggest that the metamorphic reworking of the Thompson belt metasediments had three phases, an early period of folding ([Formula: see text]), followed by cross-folding and amphibolite facies metamorphism corresponding to the main pulse of the Hudsonian Orogeny ([Formula: see text]), and finally, late-stage shearing, faulting, and retrograde metamorphism (1625–1550 Ma). Mafic to ultramafic magmatism and associated nickel mineralization are confined to the interval between the deposition of the Thompson belt supracrustals and the first phase of Hudsonian deformation (i.e., ca. 2.1–1.8 Ga).

The ‘Nautch’, the Veil and the Bayadère: The Indian Dance as Musical Nexus

2019 ◽  
pp. 213-235
Author(s):  
Margaret E. Walker
Keyword(s):  
19Th Century ◽  
Real Life ◽  
Early Period ◽  
Art Music ◽  
Western Art ◽  
Artistic Production ◽  
History Of ◽  
Indian Dance ◽  
The Veil

During the early period of mercantile contact with India, the exotic spectacle of the Bayadères or Nautch Girls seized the imagination of western sojourners and inspired an abundance of artistic production back in Europe. The ‘dancing girl’ is found everywhere in late 18th- and 19th-century orientalist paintings, poetry, novels, and of course, ballets, operas and other musical compositions. Although there are substantial studies exploring musical orientalisms in western art music, little attention has been paid to the role of real-life performances in such musical creation. This chapter explores the influence of the colonial interaction with Indian dance performances over the long 19th century. It argues not only for a nuanced and historicised approach to musical encounter but also, given the centrality of the Nautch in the Indian context, for the crucial inclusion of dance in the global history of music.

scholarly journals PERSONALITIES OF LEADERS OF THE UKRAINIAN CHURCH IN THE CREATIVE HERITAGE OF THE MEMBERS OF CYRIL AND METHODIUS BROTHERHOOD

2020 ◽  
pp. 65-71
Author(s):  
Svitlana Kahamlyk
Keyword(s):  
Early Period ◽  
State Building ◽  
Creative Work ◽  
Russian History ◽  
Scientific Heritage ◽  
Holistic Concept ◽  
Positive Assessment ◽  
History Of ◽  
The Church

The literary and scientific heritage of the leaders of the Cyril and Methodius Brotherhood are analyzed in the article. The place of church themes and socio-cultural activities of the leaders of the Ukrainian Church is determined in this works. A comparative analysis of the creative work of P. Kulish and M. Kostomarov in the field of presentation and evaluation of individual figures of the senior Ukrainian clergy is done. It was concluded that history of the Ukrainian Church is largely represented in their works, but the disclosure of church themes in the creative work of each of the authors had its own peculiarities. The historical works of P. Kulish of the early period reflected the creative pursuits of the members of the Kyiv-Methodius Brotherhood and were typical of their environment. P. Kulish expressed his own view on the role of the clergy in history through the prism of the heroes of the Black Council, in particular, the priest I. Shram, as an important factor in Ukrainian cultural and state-building processes. At the same time, the evolution of P. Kulish's views led him to the idea of a dual Russia, in the light of which the writer's positive assessment was mainly received by those church figures who contributed to it. Unlike P. Kulish, who did not deal with history of the Church in Ukraine, M. Kostomarov became the first secular researcher who created its holistic concept. The archpastoral activities and literary works of prominent clergy of the XVII century from Petro Mohyla to Dimitri Tuptal are analyzed in his series "Russian history in the biographies of its main figures" as so as their influence on Ukrainian and Russian culture is emphasized. Therefore, M. Kostomarov can rightly be considered one of the creators of the Ukrainian secular historiography of the history of the Church, the main merit of which is the creation in this area of separate monographs and numerous studies of a biographical nature.

Re-examining the early history of the Leiden jar: Stabilization and variation in transforming a phenomenon into a fact

2018 ◽  
Vol 56 (3) ◽  
pp. 314-342 ◽  
Author(s):  
Cibelle Celestino Silva ◽  
Peter Heering
Keyword(s):  
Knowledge Production ◽  
Current Knowledge ◽  
Early Period ◽  
Electrical Circuit ◽  
Early History ◽  
Primary Sources ◽  
New Device ◽  
Scientific Knowledge Production ◽  
History Of

In this paper, we examine the period that immediately followed the invention of the Leiden jar. Historians of science have developed narrations that emphasize the role of grounding during the process of charging the jar. In this respect, this episode shows significant aspects that can be used to characterize science, scientific knowledge production, and the nature of science. From our own experimentation, we learned that grounding was not necessary in order to produce the effect. These experiences inspired us to go back to primary sources. In doing so, we came to a new understanding of the early period after Kleist’s and Musschenbroek’s initial creation of the effect. From our analysis, we conclude that it is not the grounding which was perceived as a major innovation (as well as a challenge) during this early period of the discussion but the concept of an electrical circuit. This understanding was fundamental in characterizing the Leiden jar as a new device challenging the then current knowledge of experimental practices in the field of electricity.

scholarly journals Early Symptoms of Modernism in Traditional Balinese Painting Began in Northern Bali

2020 ◽  
Vol 5 (2) ◽  
pp. 59-72
Author(s):  
I Dewa Alit Dwija Putra ◽  
◽  
Sarena Abdullah ◽  
Keyword(s):  
Modern Art ◽  
Early Period ◽  
The West ◽  
Early Symptoms ◽  
History Of ◽  
Traditional Arts ◽  
The Village ◽  
Visual Changes

The history of significant changes in traditional Balinese art towards modern art took place in the 1930s in the village of Ubud, South Bali. Visual changes in Balinese art are unlike changes in modern art in the West or in Indonesian modern art. The visuals show a strong traditional style, although signs of modernity as this paper will argue, can be found. Modern Balinese art in Ubud in the 1930s actually started in North Bali in the 1870s. It was the role of two Dutchmen named Van der Tuuk and W.O.J. Nieuwenkamp, a linguist and academic artist, who contributed to the introduction of modern art to North Balinese artists. The interaction between the two Dutchmen and the local artists gave birth to arts that are slightly different from traditional arts in Bali. This paper will discuss the shift from traditional to modern painting done by Balinese artists in this early period that resulted in the transition of traditional to modern art through the changes in techniques and media; and themes and functions of these visuals. As such, this marks a shift from art that are no longer spiritual but lean more towards the profane.

scholarly journals A new dinoflagellage cyst sequence biostratigraphic framework for the Miocene of the Baltimore Canyon Trough and adjacent Salisbury Embayment

1992 ◽  
Vol 6 ◽  
pp. 299-299
Author(s):  
Laurent De Verteuil ◽  
Geoffrey Norris
Keyword(s):  
Field Studies ◽  
Third Order ◽  
Depositional History ◽  
Margin Setting ◽  
Independent Test ◽  
History Of ◽  
Age Model ◽  
Using Data ◽  
Stratigraphic Sequences

Over the past two decades, extensive seismic mapping of the Baltimore Canyon Trough off New Jersey, Delaware and Virginia, has documented a succession of progradational Miocene stratigraphic sequences. Understanding the depositional timing of these sequences is critical in evaluating the role of eustasy in their development, but has until now been hampered by the lack of suitably high resolution biostratigraphic data. Attempts to produce an integrated Neogene basin history have previously been frustrated by an inability to directly correlate individual shelf-based seismic sequences, with regionally mapped onshore, unconformity-bound, stratigraphic units. This study addresses both problems using data comprising the stratigraphic distribution of dinoflagellate cysts in two composited outcrop and ten subsurface sections from the Salisbury Embayment and adjacent Baltimore Canyon Trough. The result is a detailed age model for the entire Miocene depositional history of the area. Onshore samples are from the type sections of the Chesapeake Group in Maryland and Virginia. Offshore COST B-2 & B-3, Exxon 684 & 902 and Mobil 500 wells are directly tied to the regional seismic grid.According to our model, the magnitude and timing of mapped sequences in the Baltimore Canyon Trough compare well with Miocene third order cycles of the Exxon Cycle Chart. With the exception of the 22 Ma sequence (Cycle 1.5 of Haq et al., 1988), all of the other postulated eustatically controlled sequences are potentially present in the study area. In addition, on the basis of seismic mapping and integrated biostratigraphy, our model predicts one additional lower Serravalian sequence between 15.5 Ma and 13.8 Ma, and two additional lower Tortonian sequences between 10.5 Ma and 8.2 Ma. The onshore expression of these sequences are, respectively, the Calvert Beach Member of the Calvert Formation and parts of the Little Cove Point Beds of the Saint Marys Formation. An important implication of the age model is that the entire Fairhaven Member and “beds 4-9” of the Plum Point Marl Member, of the Calvert Formation, are lower Miocene strata.These dinocyst data were not available when the Exxon model of Miocene eustatic cycles was developed and therefore represent a critical independent test of that model. This is particularly so because the tectonically quiescent, mature, divergent-margin setting of the basin limits the role of causative variables other than eustasy, in the development and architecture of third order depositional sequences. Our model should be further tested by detailed sedimentological and taphonomic field studies of the Chesapeake Group.

scholarly journals Role of Electromagnetics in Polarization Radar Development from 1970-1995: Personal Reflections

2019 ◽  
Author(s):  
Viswanathan Bringi ◽  
Dusan Zrnic
Keyword(s):  
World War Ii ◽  
Wave Attenuation ◽  
Early Period ◽  
Radiowave Propagation ◽  
Radar Polarimetry ◽  
History Of ◽  
Personal Reflections ◽  
Rain Rates ◽  
Modern Era

The modern era of polarimetric radar begins with radiowave propagation research starting in the early 1970s with applications to measurement and modeling of wave attenuation in rain and depolarization due to ice particles along satellite-earth links. While there is a rich history of radar in meteorology after World War II, the impetus provided by radiowave propagation requirements lead to high quality antennas and feeds. Our journey starts by describing the key institutions and personnel responsible for development of weather radar polarimetry. The early period was dominated by circularly polarized radars for propagation research and at S-band for hail detection. By the mid-to late 70s, a paradigm shift occurred which led to the dominance of linear polarizations with applications to slant path attenuation prediction as well as estimation of rain rates and inferences of precipitation physics. The period from early 1980s to 1995 can be considered as the “golden” period of rapid research that brought in meteorologists, cloud physicists and hydrologists. This article describes the evolution of this technology from the vantage point of the authors. Their personal reflections and “behind the scenes” descriptions offer a glimpse into the inner workings at several key institutions which cannot be found elsewhere.

scholarly journals Atalyks and the Institute of Atalykship in the Kazakh Khanate

2021 ◽  
Vol 136 (3) ◽  
pp. 10-24
Author(s):  
N.A. Atygayev ◽  
Keyword(s):  
Early Period ◽  
Main Function ◽  
Historical Sources ◽  
Russian State ◽  
The Social ◽  
The Status ◽  
History Of ◽  
Legislative Reforms ◽  
Important State

The article analyzes information from historical sources about the atalyks and the Institute of Atalykship in the Kazakh Khanate. The materials of the study were the information of medieval works of Muslim historians, including those not yet put into scientific circulation, published official materials of the 16th18th centuries, the ambassadorial order of the Russian state, magazines, and official notes of the diplomat A.I. Tevkelev, data from Chinese sources, etc. The author cites information from historical sources indicating the existence of the Institute of Atalykship in the Kazakh Khanate. The author draws attention to the fact that the earliest information about the ataliks is contained in the works of Shibanid and Safavid historiography. The work gives the names of more than ten persons who bore the title «atalyk» in the Kazakh Khanate. Despite the paucity of materials about the institution of Atalykship in the Kazakh Khanate, the author makes some assumptions based on the analogy of the institution of atalism in neighboring countries. During the study, the following preliminary conclusions were made about the atalyks and the Institute of Atalykship in the Kazakh Khanate: 1. In the Kazakh Khanate, as well as in many medieval Turkic-Mongolian states, there was an Institute of Atalykship. 2. The Institute of Atalykship was one of the important state-forming elements in the Kazakh Khanate of the 15-17th centuries. 3. The main function of the atalyk in the Kazakh Khanate, as well as in other Turkic-Mongolian states, was to educate the heirs to the throne. 4. Atalyk, as the most faithful and close to the khan people, performed the most important diplomatic functions. 5. The role of the atalyk underwent a transformation in the Kazakh Khanate. In the early period of the history of the Kazakh state, the status of the atalyk at the khan’s court was high. From the end of the 17th century, in connection with the legislative reforms of Tauke Khan, the status of the atalyk significantly decreased and he began to occupy a status in the social hierarchy below the clan elders

Iron-titanium oxides as an indicator of the role of the fluid phase during the cooling of granites metamorphosed to granulite grade

1980 ◽  
Vol 43 (329) ◽  
pp. 623-631 ◽  
Author(s):  
Hugh R. Rollinson
Keyword(s):  
Fluid Phase ◽  
Granulite Facies ◽  
Granitic Rocks ◽  
Titanium Oxides ◽  
Cooling History ◽  
Granulite Facies Metamorphism ◽  
North West ◽  
Facies Metamorphism ◽  
History Of

SummaryA detailed electron probe study of irontitanium oxide intergrowths from slowly cooled granitic rocks from the granulite grade, Archaean Scourian complex of north-west Scotland has yielded a wealth of information about magmatic and metamorphic temperatures, subsolidus cooling, and the behaviour of the fluid phase during cooling. Five stages are documented in the cooling history of granites and trondhjemites which include: (i) magmatic-subsolidus cooling (1035 °C–890 °C); (ii) granulite facies metamorphism and the accompanied expulsion of a hydrous fluid phase (890 °C–830 °C); (iii) subsolidus cooling following the peak of the granulite facies metamorphism (830 °C–660 °C); (iv) the localized reintroduction of water into the rocks during retrogression (660 °C–530 °C) and (v) subsolidus cooling and re-equilibration in the presence of a finite amount of H2O (530 °C–320 °C).

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