Добірка наукової літератури з теми "Palaeo-redox"
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Статті в журналах з теми "Palaeo-redox"
Lüning, Sebastian, Sadat Kolonic, David K. Loydell, and Jonathan Craig. "Reconstruction of the original organic richness in weathered Silurian shale outcrops (Murzuq and Kufra basins, southern Libya)." GeoArabia 8, no. 2 (April 1, 2003): 299–308. http://dx.doi.org/10.2113/geoarabia0802299.
Повний текст джерелаJin, Chengsheng, Chao Li, Thomas J. Algeo, Guochang Wang, Wei Shi, Meng Cheng, Zihu Zhang, Haiyang Wang, Na Li, and Wei Wang. "Spatial heterogeneity of redox-sensitive trace metal enrichments in upper Ediacaran anoxic black shales." Journal of the Geological Society 178, no. 5 (March 4, 2021): jgs2020–234. http://dx.doi.org/10.1144/jgs2020-234.
Повний текст джерелаMahoney, Carol, Christian März, Jim Buckman, Tom Wagner, and Vladimir-Orlando Blanco-Velandia. "Pyrite oxidation in shales: Implications for palaeo-redox proxies based on geochemical and SEM-EDX evidence." Sedimentary Geology 389 (July 2019): 186–99. http://dx.doi.org/10.1016/j.sedgeo.2019.06.006.
Повний текст джерелаYiqing, Zhu, Wang Xingzhi, Feng Mingyou, Pu Kun, and Cai Jiacheng. "Palaeo-redox environment analysis of Longmaxi formation shale in southern Sichuan basin by XRF and ICP-MS." ScienceAsia 44, no. 2 (2018): 109. http://dx.doi.org/10.2306/scienceasia1513-1874.2018.44.109.
Повний текст джерелаKillick, A. M. "The setting and style of manganese mineralization in the Constantiaberg Massif, Cape Peninsula, South Africa." South African Journal of Geology 123, no. 4 (October 26, 2020): 493–510. http://dx.doi.org/10.25131/sajg.123.0034.
Повний текст джерелаGuo, Yu, Wenzhe Gang, Gang Gao, Shangru Yang, Chong Jiang, Guo Chen, Chuanzhen Zhu, et al. "An integrated organic–inorganic geochemical characterization of Paleogene sediments in No.1 Structural Belt of the Nanpu Sag, Bohai Bay Basin, eastern China: implications for the origin of organic matter." Geochemistry: Exploration, Environment, Analysis 21, no. 1 (October 5, 2020): geochem2019–060. http://dx.doi.org/10.1144/geochem2019-060.
Повний текст джерелаMen, Yekai, Ende Wang, Jianfei Fu, Sanshi Jia, Xinwei You, and Qiangwen He. "Geology and geochemistry of the Yuanjiacun banded iron formation in Shanxi Province, China: constraints on the genesis." Geological Magazine 156, no. 11 (April 15, 2019): 1839–62. http://dx.doi.org/10.1017/s0016756819000219.
Повний текст джерелаZheng, Xue, Baruch Spiro, and Zuozhen Han. "Comparison of Geochemical and Mineralogical Characteristics of Palaeogene Oil Shales and Coals from the Huangxian Basin, Shandong Province, East China." Minerals 10, no. 6 (May 29, 2020): 496. http://dx.doi.org/10.3390/min10060496.
Повний текст джерелаZhang, Lei, Shan Chang, Maliha Zareen Khan, Qinglai Feng, Cui Luo, Michael Steiner, Marie-Béatrice Forel, Kai Liu, and Sébastien Clausen. "Influence of palaeo-redox and diagenetic conditions on the spatial distribution of Cambrian biotas: A case study from the upper Shuijingtuo Formation (Cambrian Series 2, Stage 3), Three Gorges area of South China." Palaeogeography, Palaeoclimatology, Palaeoecology 548 (June 2020): 109696. http://dx.doi.org/10.1016/j.palaeo.2020.109696.
Повний текст джерелаBullock, Liam A., John Parnell, Joseph G. T. Armstrong, Magali Perez, and Sam Spinks. "Gold in Irish Coal: Palaeo-Concentration from Metalliferous Groundwaters." Minerals 10, no. 7 (July 17, 2020): 635. http://dx.doi.org/10.3390/min10070635.
Повний текст джерелаДисертації з теми "Palaeo-redox"
Liebelt, S. R. "Testing the redox coupling between chromium and nitrogen isotopes in modern and ancient redox-stratified depositional systems: the Coorong Lagoon and the Greater McArthur Basin." Thesis, 2019. https://hdl.handle.net/2440/136963.
Повний текст джерелаThe history of Earth’s atmospheric oxidation following the Great Oxidation Event (GOE) is widely debated and currently poorly constrained. This uncertainty is largely because the use of different geochemical proxies provides a broad range of possible palaeo-redox conditions during the mid-Proterozoic. Such proxies include nitrogen (δ15N) and chromium (δ53Cr) isotopes, which are the focus of this study. These redox-sensitive proxies have recently demonstrated coupled behaviour in both modern seawaters and recent marine sediments, suggesting isotopic fractionation of Cr could result from biologically mediated redox cycling of N. This concept is opposed to Cr isotope fractionation being purely representative of oxidative weathering on continents, thus challenging the reliability of the δ53Cr proxy as a direct tracer for past atmospheric O2 levels. The aim of this study is to test the purported redox coupling of the δ53Cr and δ15N proxies in two redox-stratified depositional systems, specifically investigating (i) modern waters and organic matter from the Coorong Lagoon of South Australia, and (ii) organic-rich shales from the greater McArthur Basin in the Northern Territory (including the Velkerri, Mainoru, Barney Creek and Fraynes Formations). These marine settings display notable redox gradients, allowing insight into the isotopic behaviour of N and Cr through a variety of conditions. Contrary to published data, this study revealed no positive co-variance between δ53Cr and δ15N records. Rather, δ15N changes in both waters and shales are interpreted to largely result from pH-driven volatilisation of NH3, while δ53Cr variations in shales exhibit a systematic temporal increase. This increase likely reflects progressive basin oxygenation, linked to gradually increasing atmospheric O2 during the mid-Proterozoic (i.e. from 1.64 to 1.31 Ga). Thus, the validity of δ53Cr values in marine archives as a palaeo-redox proxy are supported in this instance, with no direct evidence for biologically driven redox cycling of Cr coupled to local N cycling.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2019
McFadzean, G. J. "Geochemical analysis of the McArthur and Tawallah Groups, McArthur Basin: chemostratigraphy & palaeo-redox proxies using shales and carbonates." Thesis, 2019. https://hdl.handle.net/2440/136976.
Повний текст джерелаThe lower portion of the McArthur Basin includes the Palaeoproterozoic to Mesoproterozoic McArthur and Tawallah Groups. During this time, Earth had comparatively less oxygen following the beginning of ‘The Great Oxygenation Event’ (GOE, Palaeoproterozoic ca. 2.34 Ga) and organisms were simple. In conjunction, the ‘Boring Billion’ (1800 to 800 Ma) is an acknowledged period following the GOE due to reported flat carbon and oxygen isotope trends which is evidence for a relatively stable climate and delayed organism evolution. The aim of this thesis is to gather a coupled dataset using conventional geochemistry and organic geochemistry through the use of carbon/oxygen isotopes, redox sensitive trace elements (Mo, V and U), rare earth elements and organic carbon content in order to understand the oxygen conditions (through palaeo-redox techniques) within the lower portions of the Palaeoproterozoic McArthur Basin. Shale units of the McArthur and Tawallah groups (Mallapunyah, Wollogorang and Wuraliwuntya Formations) are shown to be deposited in a stratified oxygenation and sulfidic environment. These episodes of anoxia or euxinia are shown by elevated concentrations of rare earth elements (REE) and trace elements at specific drill core depth. Subtle and fluctuating cerium and europium anomalies along with trace and major elemental data were coupled by total organic carbon (TOC) to show a relationship with the organic matter within the Wollogorang Formation specifically. The trace elements seemingly concentrated within the regions of high organic content, which resulted in euxinia events causing elevated levels of trace metals. Potential trace metal elevations within the Wollogorang and Mallapunyah Formations specifically are compared against the reported evidence for sedimentary exhalative deposits (SedEX deposits). The Amelia Dolostone recorded carbon isotope values of 0 to -2‰ and oxygen isotope values of -5 to -9‰ - expected carbon and oxygen isotopic concentrations for the Palaeoproterozoic to Mesoproterozoic Era.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2019