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Статті в журналах з теми "Wonoka Formation"

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Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 29 січня 2023

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1

Haines, Peter W. "Problematic fossils in the late Neoproterozoic Wonoka Formation, South Australia." Precambrian Research 100, no. 1-3 (March 2000): 97–108. http://dx.doi.org/10.1016/s0301-9268(99)00070-4.

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2

Minguez, D., and K. P. Kodama. "Rock magnetic chronostratigraphy of the Shuram carbon isotope excursion: Wonoka Formation, Australia." Geology 45, no. 6 (March 30, 2017): 567–70. http://dx.doi.org/10.1130/g38572.1.

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3

Cui, Huan. "Rock magnetic chronostratigraphy of the Shuram carbon isotope excursion: Wonoka Formation, Australia: COMMENT." Geology 45, no. 10 (October 1, 2017): e429-e429. http://dx.doi.org/10.1130/g39593c.1.

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4

Minguez, Daniel, and Kenneth P. Kodama. "Rock magnetic chronostratigraphy of the Shuram carbon isotope excursion: Wonoka Formation, Australia: REPLY." Geology 45, no. 10 (October 1, 2017): e430-e430. http://dx.doi.org/10.1130/g39648y.1.

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5

Husson, J. M., A. C. Maloof, B. Schoene, C. Y. Chen, and J. A. Higgins. "Stratigraphic expression of Earth's deepest 13C excursion in the Wonoka Formation of South Australia." American Journal of Science 315, no. 1 (January 1, 2015): 1–45. http://dx.doi.org/10.2475/01.2015.01.

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6

DiBona, P. A., C. C. von der Borch, and N. Christie‐Blick. "Sequence stratigraphy and evolution of a basin‐slope succession: The Late Proterozoic Wonoka Formation, Flinders Ranges, South Australia." Australian Journal of Earth Sciences 37, no. 2 (June 1, 1990): 135–45. http://dx.doi.org/10.1080/08120099008727916.

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7

Haines, Peter W. "Storm-dominated mixed carbonate / siliciclastic shelf sequence displaying cycles of hummocky cross-stratification, late Proterozoic Wonoka Formation, South Australia." Sedimentary Geology 58, no. 2-4 (August 1988): 237–54. http://dx.doi.org/10.1016/0037-0738(88)90071-1.

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8

Moynihan, David P., Justin V. Strauss, Lyle L. Nelson, and Colin D. Padget. "Upper Windermere Supergroup and the transition from rifting to continent-margin sedimentation, Nadaleen River area, northern Canadian Cordillera." GSA Bulletin 131, no. 9-10 (March 8, 2019): 1673–701. http://dx.doi.org/10.1130/b32039.1.

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Анотація:

AbstractNeoproterozoic–Cambrian rocks of the Windermere Supergroup and overlying units record the breakup of Rodinia and formation of the northwestern Laurentian ancestral continental margin. Understanding the nature and timing of this transition has been hampered by difficulty correlating poorly dated sedimentary successions from contrasting depositional settings across Mesozoic structures. Here we present new litho- and chemo-stratigraphic data from a Cryogenian–lower Cambrian succession in east-central Yukon (Canada), establish correlations between proximal and distal parts of the upper Windermere Supergroup and related strata in the northern Canadian Cordillera, and consider implications for the formation of the northwestern Laurentian margin. The newly defined Nadaleen Formation hosts the first appearance of Ediacaran macrofossils, while the overlying Gametrail Formation features a large negative carbon isotope anomaly with δ13Ccarb values as low as –13‰ that correlates with the globally developed Shuram-Wonoka anomaly. We also define the Rackla Group, which includes the youngest (Ediacaran) portions of the Windermere Supergroup in the northern Cordillera. The top of the Windermere Supergroup is marked by an unconformity above the Risky Formation that passes into a correlative conformity in the Nadaleen River area. This surface has been interpreted to mark the top of the rift-related succession, but we draw attention to evidence for tectonic instability through the early-middle Cambrian and argue that the transition from rifting to post-rift thermal subsidence is marked by a widespread unconformity that underlies upper Cambrian carbonate rocks. This is younger than the interpreted age of the rift to post-rift transition elsewhere along the ancestral western Laurentian continental margin.

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9

Kernen, Rachelle A., Katherine A. Giles, Mark G. Rowan, Timothy F. Lawton, and Thomas E. Hearon. "Depositional and halokinetic-sequence stratigraphy of the Neoproterozoic Wonoka Formation adjacent to Patawarta allochthonous salt sheet, Central Flinders Ranges, South Australia." Geological Society, London, Special Publications 363, no. 1 (2012): 81–105. http://dx.doi.org/10.1144/sp363.5.

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10

Sui, Yu, Chunju Huang, Rui Zhang, Zhixiang Wang та James Ogg. "Astronomical time scale for the middle-upper Doushantuo Formation of Ediacaran in South China: Implications for the duration of the Shuram/Wonoka negative δ13C excursion". Palaeogeography, Palaeoclimatology, Palaeoecology 532 (жовтень 2019): 109273. http://dx.doi.org/10.1016/j.palaeo.2019.109273.

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11

Widyahening, Indah S., Rodri Tanoto, Fedri Rinawan, Elsa P. Setiawati, and Zorayda E. Leopando. "Does the establishment of universal health coverage drive the foundation of postgraduate education for primary care physicians?" Medical Journal of Indonesia 26, no. 2 (August 18, 2017): 141–51. http://dx.doi.org/10.13181/mji.v26i2.1857.

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Background: Studying the formation of postgraduate training in primary care within countries which has attained Universal Health Coverage (UHC) is important to support the development of similar training in low-and middle-income countries aiming to achieve UHC by 2030. This review aims to describe the state of postgraduate training for primary care physicians in UHC-attaining countries.Methods: A literature review of published literature and official documents from the websites of regional and global health/primary care organizations or societies such as World Health Organization (WHO), World Organization of Family Doctors (WONCA), European Forum for Primary Care, European Union of General Practitioners (GP)/Family Physicians (FP), European Academy of Teachers in GP/Family Medicine (FM), as well as the websites of GP/FP organizations in each of the respective countries. The list of UHC attained countries were identified through WHO and International Labor Organization databases.Results: A total number of 72 UHC-attained countries were identified. Postgraduate education for primary care physicians exists in 62 countries (86%). Explicit statements that establish primary care postgraduate training were corresponded with the policy on UHC is found in 11 countries (18%). The naming of the program varies, general practice and family medicine were the commonest. In 33 countries (53%), physicians are required to undertake training to practice in primary level. The program duration ranged from 2–6 years with 3 years for the majority.Conclusion: Although UHC is not the principal driving force for the establishment of postgraduate training for primary care physicians in many countries, most UHC-attaining countries make substantial endeavor to ensure its formation as a part of their health care reform to improve national health.

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12

Mutuku, Richard Kyalo. "Africa Rising: a Pathway of Three Frontiers – Internet of Things, Population Growth and Free Trade Area." African Review 47, no. 1 (March 30, 2020): 141–60. http://dx.doi.org/10.1163/1821889x-12340012.

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Abstract Africa rising is a raging discourse among policy wonks and African scholars. Some have questioned the veracity of this proposition, while others agree that indeed Africa’s prospects are incontrovertible. In this article, the author developed an exegesis to theorize that Africa’s future growth, at least for the next one century, shall depend on three praxes: internet of things, population growth and the eventual implementation of AfCFTA. Internet of things accentuated by increased internet connectivity is going to create prodigious solutions to African problems, especially in increasing financial inclusion, solving election malpractices through blockchain technology, raising income earnings for rural communities via the sharing economy and improving agribusiness productivity through smart farming. These solutions will mostly target small-holder business players and poor households in hinterland Africa, aiming to lift them from poverty and narrowing the inequality gap. Besides, Africa’s population growth is estimated to reach 2.4 billion by 2050 and theorized to create a market revolution punctuated by a demographic dividend of 15–64-year-olds. The youthful population shall be necessary for providing workforce and technological innovations for driving the wheels of growth in the continent. Moreover, AfCFTA shall be the largest Free Trade Area since the formation of WTO, providing a 1.2 billion people mass market (Signe, 2018: 3). In retrospect, the author intends to demonstrate that the three pathways – the internet of things, population growth and AfCFTA – shall be quintessential building blocks for actualizing the Africa Rising narrative.

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13

Ali, Essossinam. "Climate change and agricultural development in West Africa: Role of renewable energy and trade openness." Environmental Economics 12, no. 1 (February 8, 2021): 14–31. http://dx.doi.org/10.21511/ee.12(1).2021.02.

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The design, implementation, and evaluation of energy policies in combating climate change are becoming increasingly evident to strengthen economic growth driven by the agricultural sector in most developing countries. The study analyzes the direct and indirect effects of renewable energy consumption (REC) on agriculture value-added (AgVA), CO2 emissions, and trade openness in the short- and long-run in the West African countries. The second-generation panel unit root tests, the panel cointegration methods, and Panel Vector Error Correction Model are used with World Bank data from 1990 to 2015. A panel Granger causality test was also used to determine the direction of causality between variables. Findings show a unidirectional relationship between AgVA, CO2 emissions, and REC; between REC, gross fixe capital formation (GFCF) and trade openness. Moreover, the bidirectional hypothesis is verified between agricultural development and trade openness. However, the null hypothesis is found between AgVA and GFCF, on the one hand, and GFCF and CO2 emissions, on the other hand. These results suggest that fostering renewable energy policy and revisiting trade policy toward reducing environmental pollution will enable agricultural development and boost the regional economy. AcknowledgmentThe author wants to thank Dr. Moukpè GNINIGUE for his technical supports and Prof. Jean Marcelin Bosson BROU from the University of Houphouet Boigny (Cote d’Ivoire), Dr. Odzadifo K. WONYRA and Dr. Hodabalo BATAKA from the University of Kara, Dr. Koffi Massesso ADJI from the West African Sciences Services Centre on Climate Change and Land Use (University of Cheikh Anta Diop, Dakar) and Essotanam MAMBA from the University of Lomé for their constructive comments on the earlier version of this manuscripts. Finally, the author is grateful to the anonymous reviewers and Editor-in-Chief of Environmental Economics, whose comments have improved this paper. However, the opinions expressed in this paper are solely those of the author.

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14

Ha, Tae-Hyun, Jun-Seok Park, Gyu-Bong Cho, Hyo-Jun Ahn, Ki-Won Kim, Jou-Hyeon Ahn, and Kwon-Koo Cho. "The Effect of Si Doping or/and Ti Coating on the Electrochemical Properties of Ni-Rich NCA (LiNi0.8Co0.15Al0.05O2) Cathode Material for Lithium-Ion Batteries." Science of Advanced Materials 12, no. 10 (October 1, 2020): 1581–85. http://dx.doi.org/10.1166/sam.2020.3797.

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LiNixCoyAlzO2 (NCA) is one of the most promising candidates of cathode material for lithium ion batteries because of its high capacity, energy density, and low cost. However, Ni-rich NCA cathode materials suffer from side reaction (formation of lithium carbonate and hydrogen fluoride attack) between electrolyte and surface of electrode and irreversible phase transition leading to capacity fading and thermal instability. These problems could be improved by coating and doping of transition metal elements. Si doping contributes to stabilization of the unstable R-3m structure, and Ti coating is capable of prohibiting the direct physical contact of electrode with electrolyte. In this work, LiNi0.8Co0.15Al0.05O2 (NCA) cathode materials coated or/and doped by Ti and Si elements were fabricated by co-precipitation method using the ball-milling. The crystal structure, morphology and electrochemical properties are investigated using X-ray diffraction (XRD), scanning electron microscopy (FE-SEM), transmission electron microscopy (FE-TEM), and WBCS3000 (WonA tech Co., Ltd.). The EIS and charge/discharge results of Si doped and Ti coated NCA exhibited the lowest resistance value (147.19 Ω) and capacity retentions of 88% after 100 cycles at 0.5 C.

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15

P. A. DiBona (2), C. C. von der Bor. "Sedimentary Geology and Evolution of an Outcropping Shelf-Margin Delta, Late Proterozoic Wonoka Formation, South Australia." AAPG Bulletin 77 (1993). http://dx.doi.org/10.1306/bdff8db2-1718-11d7-8645000102c1865d.

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16

Willman, Sebastian, John S. Peel, Jon R. Ineson, Niels H. Schovsbo, Elias J. Rugen, and Robert Frei. "Ediacaran Doushantuo-type biota discovered in Laurentia." Communications Biology 3, no. 1 (November 6, 2020). http://dx.doi.org/10.1038/s42003-020-01381-7.

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Abstract The Ediacaran period (635–541 Ma) was a time of major environmental change, accompanied by a transition from a microbial world to the animal world we know today. Multicellular, macroscopic organisms preserved as casts and molds in Ediacaran siliciclastic rocks are preserved worldwide and provide snapshots of early organismal, including animal, evolution. Remarkable evolutionary advances are also witnessed by diverse cellular and subcellular phosphatized microfossils described from the Doushantuo Formation in China, the only source showing a diversified assemblage of microfossils. Here, we greatly extend the known distribution of this Doushantuo-type biota in reporting an Ediacaran Lagerstätte from Laurentia (Portfjeld Formation, North Greenland), with phosphatized animal-like eggs, embryos, acritarchs, and cyanobacteria, the age of which is constrained by the Shuram–Wonoka anomaly (c. 570–560 Ma). The discovery of these Ediacaran phosphatized microfossils from outside East Asia extends the distribution of the remarkable biota to a second palaeocontinent in the other hemisphere of the Ediacaran world, considerably expanding our understanding of the temporal and environmental distribution of organisms immediately prior to the Cambrian explosion.

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17

Fan, Haifeng, Xuewu Fu, Jack F. Ward, Runsheng Yin, Hanjie Wen, and Xinbin Feng. "Mercury isotopes track the cause of carbon perturbations in the Ediacaran ocean." Geology, October 12, 2020. http://dx.doi.org/10.1130/g48266.1.

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The unusual carbon biogeochemical cycling that occurred in the Ediacaran (ca. 635–541 Ma) ocean may have been critical for ocean oxygenation and Ediacaran life evolution. However, the triggers of the peculiar Ediacaran carbonate carbon isotope (δ13Ccarb) excursions are not well understood. Because mercury (Hg) has a strong affinity for organic carbon, we measured Hg isotope compositions (δ202Hg and Δ199Hg) from Ediacaran marine sediments of South China and South Australia to better understand the causes of the Ediacaran δ13Ccarb excursions. During two local positive δ13Ccarb excursions in the Doushantuo Formation, gradually decreasing Δ199Hg and increasing δ202Hg trends are primarily ascribed to enhanced terrestrial input. Decreasing δ202Hg in both the Doushantuo and Wonoka Formations during the latter part of the Shuram negative δ13Ccarb excursion demonstrates the significant, and potentially widespread, contribution of upwelling Hg associated with dissolved organic carbon (Hg-DOC) from the open deep ocean. New Hg isotope data also suggest that a large Hg-DOC reservoir may have been present in the open ocean continuously from the early to mid–late Ediacaran Period (ca. 635–551 Ma), buffering ocean oxygenation at that time.

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18

Linnemann, Ulf, Mandy Hofmann, Andreas Gärtner, Jessica Gärtner, Johannes Zieger, Rita Krause, Robert Haenel, et al. "An Upper Ediacaran Glacial Period in Cadomia: the Granville tillite (Armorican Massif) – sedimentology, geochronology and provenance." Geological Magazine, December 9, 2021, 1–15. http://dx.doi.org/10.1017/s0016756821001011.

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Abstract In the Cadomian orogenic belt a package of glacigenic sedimentary deposits have been recently described in the Armorican Massif (Normandy, France). The Granville Tillite Member, the middle part of the upper Granville Formation, is late Ediacaran in age. Maximum depositional ages of the pre- and syn-glacial sedimentary deposits obtained by LA-ICP-MS U–Pb detrital zircon dating indicate a maximum age of 561 ± 3 Ma. Combined with geochronological data on the previously described glacial deposits in Cadomia, West Africa, Arabia and Iran, the Granville Tillite Member appears to represent an Upper Ediacaran Glacial Period in northern peri-Gondwana, clearly younger than the c. 580 Ma old Gaskiers glaciation. Detailed mapping and analysis of the depositional regime of two sections near the city of Granville are indicative of two independent glaciomarine lower and upper tillite deposits separated by a distinct conglomeratic marker horizon, evidently a massive gravel beach horizon deposited during an interglacial stage. Age spectra of detrital zircon U–Pb ages constrain the palaeogeographical position of the upper Granville Formation to the periphery of the West African Craton. Post-Gaskiers aged glaciations in Cadomia and in West Africa should be grouped into an Upper Ediacaran Glacial Period dated at c. 565 Ma. This glacial period seems not to be related to the negative δ13C Shuram–Wonoka anomaly. Sedimentary deposits formed during the Upper Ediacaran Glacial Period show a scattered distribution along the marginal orogens of the Gondwana supercontinent independent of palaeolatitude and are coupled most likely to contemporaneous orogenic processes and uplift.

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