Mesoproterozoic Basement From the Central and Southern Appalachians Reveal High-temperature Magmatic Conditions and Non-laurentian origin of Earth\u27s Most Zircon Fertile Magmas

The Mesoproterozoic (1.4-0.9 Ga) Grenville Orogeny led to the formation of the supercontinent Rodinia. One unique characteristic of the Grenville Orogeny is that it produced a volumetrically significant amount of zirconium- (Zr) enriched granitoids, evidently more than any period both prior to and after the Grenville. To investigate this further, Mesoproterozoic basement rocks were sampled along the axis of the current Appalachian Mountains from western North Carolina north to southern New York, as well as from the northern Andes in southern Colombia. Zircon was extracted from these rocks to exploit its propensity to incorporate several isotopic tracers useful in determining age, petrogenesis, and thermal conditions during crystallization. These include Uranium-Lead (U-Pb), Hafnium (Hf), the rare earth elements (REE), stable isotopes of Oxygen (O), and Titanium (Ti). Using these isotope systems together, the main goal of the research presented here is to better our understanding of the tectonic history of southeastern Laurentia during the Mesoproterozoic (Chapter 1), to investigate the potential link between Laurentia and Amazonia during the formation of Rodinia (Chapter 2), and to elucidate the tectonic processes responsible for creating Zr-enriched magmas (Chapter 3)

Mesoproterozoic Basement From The Central And Southern Appalachians Reveal High-temperature Magmatic Conditions And Non-laurentian Origin Of Earth’s Most Zircon Fertile Magmas

The Mesoproterozoic (1.4-0.9 Ga) Grenville Orogeny led to the formation of the supercontinent Rodinia. One unique characteristic of the Grenville Orogeny is that it produced a volumetrically significant amount of zirconium- (Zr) enriched granitoids, evidently more than any period both prior to and after the Grenville. To investigate this further, Mesoproterozoic basement rocks were sampled along the axis of the current Appalachian Mountains from western North Carolina north to southern New York, as well as from the northern Andes in southern Colombia. Zircon was extracted from these rocks to exploit its propensity to incorporate several isotopic tracers useful in determining age, petrogenesis, and thermal conditions during crystallization. These include Uranium-Lead (U-Pb), Hafnium (Hf), the rare earth elements (REE), stable isotopes of Oxygen (O), and Titanium (Ti). Using these isotope systems together, the main goal of the research presented here is to better our understanding of the tectonic history of southeastern Laurentia during the Mesoproterozoic (Chapter 1), to investigate the potential link between Laurentia and Amazonia during the formation of Rodinia (Chapter 2), and to elucidate the tectonic processes responsible for creating Zr-enriched magmas (Chapter 3)

Problematic prospects for US-Turkish ties in the Biden era: human rights, sanctions likely among early tests

Minimal discussion of foreign policy during the US presidential campaign has left President-elect Joe Biden pinned to very few specific foreign policy positions and given him great flexibility in carrying out his program. He would probably prefer to avoid confrontation with Turkey; in fact, he will likely explore areas of potential US‑Turkish cooperation, especially against Russia. However, Biden's core positions on human rights and rule of law, his long-time focus on Aegean and Eastern Mediter­ranean issues, and his seeming inclination to continue to fight ISIS in cooperation with the Syrian-Kurdish People's Protection Units (YPG) militia - deemed "terrorists" by Ankara - probably augur deepening difficulties in US-Turkish ties. Down the line, a make-or-break decision on the future of US-Turkish ties will likely hinge on the Biden Administration’s assessment of Turkish-Russian relations. Europe may have an important say on Biden's Turkish policy; a senior Biden adviser has said the new president will coordinate his approach to Turkey with the European Union. (author's abstract

Music-Play and Communication in Children with Autism and Their Families: An Ethnographic Study

This is an ethnographic research study regarding the nature of commun-, ication, musical behavior, emotional expression, and social relationships in children with autism. Four children completed the study by participating in at least three private music-play sessions attended by the child, his or her mother, and the researcher. All music-play sessions were person-centered and child-led. A local public elementary school hosted the music-play sessions in the music classroom after school hours. In addition, the school supplied all the musical instruments used in the study. The researcher utilized the SCERTS Model assessment tool to examine each child’s abilities in socio-musical communication and emotional regulation throughout the study. The research design is an ethnographic study of the children’s reactions to music-play and their use of the music-play sessions to express their emotions, communicate with the researcher and a parent, connect with others in an environment free of neurotypical communication requirements, and engage in social interaction in the form of socio-musical games. Each child led the researcher to conclusions about the functionality of music-play, the use of music in therapeutic programs, the nature of relationships between individuals with autism and their family members, and possible ways to promote open discourse between family members of children with autism and proponents of neurodiversity

The Geothermal System Near Paisley Oregon: A Tectonomagmatic Framework for Understanding the Geothermal Resource Potential of Southeastern Oregon

The tectonic and magmatic framework of southeast Oregon provides the conditions necessary for the existence of geothermal energy resources. However, few detailed studies of geothermal systems in this part of the Basin and Range have been conducted. Young bimodal magmatism and faulting associated with the High Lava Plains coupled with the encroachment of the Basin and Range tectonic province and potentially the Walker Lane have created the structural configuration, heat source, and secondary permeability necessary for geothermal systems in southeast Oregon. The relative contribution of these provinces to the overall tectonomagmatic framework is less well understood. In this study, the geothermal system near Paisley, Oregon has been characterized by a detailed regional heat flow study, geologic mapping, aqueous geochemical analysis, a gravity survey, and a X-ray diffraction analysis of secondary alteration minerals. Based on these analyses, the Paisley geothermal system shares many aspects similar to Basin and Range geothermal systems. Geologic mapping has revealed a sequence of rocks with ages spanning from the mid Eocene-Present as well as structures related to the Basin and Range Province. A structural transfer zone connects two en-echelon normal faults in Summer Lake Basin, which controls the upwelling of thermal waters. The fault controlling fluid flow in the Paisley geothermal system was imaged using a gravity survey. Thermal water in the Paisley geothermal system has been determined to be of meteoric source, and is interpreted to be of Pleistocene age based on stable isotopes having average values of -119.59‰ and -14.18‰ for δD and δ18O, respectively. Recharge to the thermal aquifer is driven dominantly by topographic flow, with residence times on the order of 1000s of years. Aqueous geochemistry was used to determine that the Paisley geothermal system is not magmatic in origin, with low values of magmatic SO4, As, B, and high values of HCO3 and Na. Geothermometers were used to calculate reservoir temperatures between 95 °C – 166 °C. These results were independently checked by X-ray diffraction studies of alteration mineral assemblages in reservoir rocks from two production wells drilled by Surprise Valley Electrification, which revealed similar temperatures for the stability field of mineral assemblages present in the wells. Because it has been determined that the Paisley geothermal fluids are not influenced by recent magmatism, the role of bimodal magmatism associated with the High Lava Plains on geothermal systems in southeastern Oregon appears to be minimal. However, in areas where magmatism is younger than 2 million years, this may not be true. Like the geothermal systems of the western Great Basin, the location of geothermal systems in southeast Oregon is highly dependent on the regional structural architecture. Also similar to some geothermal systems of the Basin and Range, the source of water is not modern meteoric water, but is “fossil” water, which implies that production must be managed carefully to create a sustainable resource

SEED: a tool for disseminating systematic review data into Wikipedia

Wikipedia, the free-content online encyclopaedia, contains many heavily accessed pages relating to healthcare. Cochrane systematic reviews contain much high-grade evidence but dissemination into Wikipedia has been slow. New skills are needed to both translate and relocate data from Cochrane reviews to implant into Wikipedia pages. This letter introduces a programme to greatly simplify the process of disseminating the summary of findings of Cochrane reviews into Wikipedia pages

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ПРОГНОЗ ОПЕРАЦИОННОГО ВЗАИМОДЕЙСТВИЯ НА КОНТЕЙНЕРНЫХ ПЛОЩАДКАХ

The article describes a study on simulation of interaction of the main elements of a container yard. The author suggests considering operation of container handling as an absorbing Markov process. The article contains algorithm and the results of simulation of operations at container yard, recommendations for planning of maintenance works, as well as a scale of assessment of the risks related to delays in container goods dispatch. The contents are deemed to help a manager to determine the real capacity of handling resources, to forecast probable supplementary costs or extraordinary situations.Объектом изучения в статье выступает контейнерная площадка с имитационным моделированием взаимодействия ее основных элементов. Автором предлагается рассматривать операции по переработке контейнеров как марковский процесс с поглощением. Приведены алгоритм и результаты моделирования работы площадки, даны рекомендации по планированию технического обслуживания, а также шкала оценки рисков, связанных с задержками отправки контейнерных грузов. В совокупности представленный материал помогает руководителю процесса определить не только реальный потенциал перерабатывающих мощностей, но и прогнозировать возможные дополнительные затраты или неординарные для обычной практики ситуации.