scholarly journals Evidence for complex iron oxides in the deep mantle from FeNi(Cu) inclusions in superdeep diamond

2020 ◽  
Vol 117 (35) ◽  
pp. 21088-21094
Author(s):  
Chiara Anzolini ◽  
Katharina Marquardt ◽  
Vincenzo Stagno ◽  
Luca Bindi ◽  
Daniel J. Frost ◽  
...  
Keyword(s):  
Ferrous Iron ◽  
Spatial Relation ◽  
Multistage Process ◽  
Metallic Particles ◽  
Earth’S Mantle ◽  
Cu Alloy ◽  
The Earth ◽  
Superdeep Diamond ◽  
Insight Into ◽  
Bulk Chemistry

The recent discovery in high-pressure experiments of compounds stable to 24–26 GPa with Fe4O5, Fe5O6, Fe7O9, and Fe9O11stoichiometry has raised questions about their existence within the Earth’s mantle. Incorporating both ferric and ferrous iron in their structures, these oxides if present within the Earth could also provide insight into diamond-forming processes at depth in the planet. Here we report the discovery of metallic particles, dominantly of FeNi (Fe0.71Ni0.24Cu0.05), in close spatial relation with nearly pure magnetite grains from a so-called superdeep diamond from the Earth’s mantle. The microstructural relation of magnetite within a ferropericlase (Mg0.60Fe0.40)O matrix suggests exsolution of the former. Taking into account the bulk chemistry reconstructed from the FeNi(Cu) alloy, we propose that it formed by decomposition of a complex metalMoxide (M4O5) with a stoichiometry of (Fe3+2.15Fe2+1.59Ni2+0.17Cu+0.04)Σ=3.95O5. We further suggest a possible link between this phase and variably oxidized ferropericlase that is commonly trapped in superdeep diamond. The observation of FeNi(Cu) metal in relation to magnetite exsolved from ferropericlase is interpreted as arising from a multistage process that starts from diamond encapsulation of ferropericlase followed by decompression and cooling under oxidized conditions, leading to the formation of complex oxides such as Fe4O5that subsequently decompose at shallowerP-Tconditions.

scholarly journals New insight into the composition and the structure of the terrestrial planet’s deep seated zones

2016 ◽  
pp. 3-9
Author(s):  
D. Yu. Pushcharovsky ◽  
Yu. M. Pushcharovsky
Keyword(s):  
Giant Planets ◽  
Terrestrial Planets ◽  
Structure And Property ◽  
Earth’S Mantle ◽  
The Earth ◽  
Property Changes ◽  
Insight Into

The structure and composition of the Earth’s mantle and of the terrestrial planets are considered in the light of the new scientific approaches. These data indicate on the further structural subdivision of the Earth’s inner geospheres and of the Moon’s deep seated zones. The results of HP- and HT-experiments related with the transformation of the main mantle’s and core’s components of the Earth, Moon, gaseus giants (Jupiter and Saturn) and ice giant planets (Uranus and Neptune) reveal the new structure and property changes.

scholarly journals A Structural-Thermal Model of the Karkonosze Pluton (Sudetes Mountains, SW Poland) for Hot Dry Rock (HDR) Geothermal Use

2016 ◽  
Vol 61 (4) ◽  
pp. 917-935 ◽  
Author(s):  
Wiesław Bujakowski ◽  
Antoni Barbacki ◽  
Maciej Miecznik ◽  
Leszek Pająk ◽  
Robert Skrzypczak
Keyword(s):  
Central Area ◽  
Tectonic Activity ◽  
Fluid Migration ◽  
Geothermal Resources ◽  
Radiogenic Heat ◽  
Cycle System ◽  
The Earth ◽  
Binary Cycle ◽  
Sw Poland ◽  
Insight Into

Abstract The main objective of this study was to develop a spatial temperature distribution of the Karkonosze Pluton to indicate optimum locations for HDR systems at drillable depth. HDR geothermal technology makes it possible to extract heat from the Earth in areas where no hydro-geothermal resources are present. To produce electricity in a binary cycle, system temperatures of > 100°C are usually required. In this paper, the authors have analysed the potential opportunities for applying HDR technology in the area of the Karkonosze Pluton, which is regarded as an optimum location for the application of the HDR concept (due to the potential for stimulation offered by the mechanical properties of the granites, radiogenic heat production, modern tectonic activity, and the thickness of the pluton). The model used in the analysis, which takes into account a hypothetical assessment of the manner and paths of fluid migration within the pluton, provides an insight into the spatial distribution of subsurface temperatures. It thus allows the location of relatively shallow high-temperature zones, which are optimal for the efficient application of HDR technology, to be identified. With respect to this technology, the Szklarska Poręba area and the NE part of the pluton seem to be better targets than the Cieplice central area, where the model indicated much lower temperatures (e.g. at a depth of 5,000 m, estimated temperatures in the vicinity of Szklarska Poręba were about 185°C and in the vicinity of Cieplice they were about 140°C).

scholarly journals EARTH AS PRIMORDIALLY HYDROGEN-RICH PLANET: HYPOTHESIS AND REALITY

2021 ◽  
Vol 12 (3) ◽  
pp. 645-651
Author(s):  
А. V. Pospeev
Keyword(s):  
Major Part ◽  
Geochemical Data ◽  
Physical Parameters ◽  
Average Volume ◽  
Energy Potential ◽  
Earth’S Mantle ◽  
The Earth ◽  
Proper Consideration ◽  
Hydrogen Energetics

The article is focused on the role of natural hydrogen in the Earth geodynamics and energy potential. With a proper consideration of the physical parameters of the Earth’s core and mantle, we discuss the aspects of the Hydridic Earth (or Primordially Hydrogen-Rich Planet) theory, which is currently used as a fundamental hypothesis in modern projects aimed at hydrogen energetics.A probability of finding natural hydrogen deposits in sedimentary traps is estimated. It is shown that the volume of deep degassing of hydrogen can be calculated from various cosmological, petrophysical and geochemical data, and an average volume is two orders of magnitude less than the amount predicted by the Hydridic Earth hypothesis. This hypothesis gives grounds to conclude that the major part of Earth’s mantle is a metal sphere; however, this conclusion is not supported by the geological and geophysical data.

The Pen and the Spade: Gerrard Winstanley and the Digger Movement

2018 ◽  
Author(s):  
Renata Colwell
Keyword(s):  
Civil Wars ◽  
Negative Impact ◽  
The Bible ◽  
The Earth ◽  
Great Insight ◽  
English Society ◽  
Communal Living ◽  
Religious Sects ◽  
Gerrard Winstanley ◽  
Insight Into

In the wake of the English Civil Wars of the 1640s, increased religious tolerance gave rise to unprecedented religious radicalism. While most emerging religious sects adopted unorthodoxinterpretations of the Bible, some sects were more radical than others. The Diggers, led by Gerrard Winstanley, were unique in that their biblically inspired focus on private property’s inherent corruption drove them to establish an agricultural commune in Surrey in 1649. By setting an example for the rest of the world and encouraging others to adopt their methods, they hoped to ultimately restore the Earth to a state of ‘Common Treasury.’ Drawing on scriptural precedent and personal interpretation of the Bible, Winstanley offered an eloquent, politically charged justification for the Diggers’ program of communal living in The True Levellers Standard (1649), which became the Digger manifesto. It pointedly critiquedseventeenth-century English society, had both a positive and negative impact on the Diggers’ reception at the time, and survived the movement’s violent suppression and subsequent collapse. Today, it continues to offer great insight into the origins, development and fate of the Digger movement, while at the same time inspiring modern scholars to delve deeper into the movement’s significance, and raising questions about property and equality that remain highly relevant in this day and age. 

Žemės stebėjimas iš kosmoso

2021 ◽  
Author(s):  
Justinas Kilpys ◽  
Laurynas Jukna ◽  
Edvinas Stonevičius ◽  
Rasa Šimanauskienė ◽  
Linas Bevainis
Keyword(s):  
Remote Sensing ◽  
Risk Management ◽  
Environmental Monitoring ◽  
Satellite Remote Sensing ◽  
Disaster Risk ◽  
Satellite Observations ◽  
Sensor Data ◽  
Earth Observations ◽  
The Earth ◽  
Insight Into

Title in English: Earth Observations from Space. There are more than 150 environmental satellites orbiting the Earth, and they are constantly monitoring its surface and the processes happening on it. This textbook offers an introduction to the physical concepts of satellite observations, describes how sensor data is transformed into information about the Earth’s surface and how it can be applied. The scientific background of satellite remote sensing is illustrated using examples from applications in agriculture, forestry, environmental monitoring, disaster risk management, and many other areas. Book provides insight into how satellite remote sensing is used to explore and monitor natural and anthropocentric processes on the Earth and serves as introduction to the practical remote sensing.

scholarly journals Accretion of the Moon from non-canonical discs

2014 ◽  
Vol 372 (2024) ◽  
pp. 20130256 ◽  
Author(s):  
J. Salmon ◽  
R. M Canup
Keyword(s):  
Angular Momentum ◽  
Rotation Period ◽  
Major Axis ◽  
The Moon ◽  
Large Excess ◽  
Semi Major Axis ◽  
Earth’S Mantle ◽  
The Earth ◽  
Post Impact ◽  
Impact Simulations

Impacts that leave the Earth–Moon system with a large excess in angular momentum have recently been advocated as a means of generating a protolunar disc with a composition that is nearly identical to that of the Earth's mantle. We here investigate the accretion of the Moon from discs generated by such ‘non-canonical’ impacts, which are typically more compact than discs produced by canonical impacts and have a higher fraction of their mass initially located inside the Roche limit. Our model predicts a similar overall accretional history for both canonical and non-canonical discs, with the Moon forming in three consecutive steps over hundreds of years. However, we find that, to yield a lunar-mass Moon, the more compact non-canonical discs must initially be more massive than implied by prior estimates, and only a few of the discs produced by impact simulations to date appear to meet this condition. Non-canonical impacts require that capture of the Moon into the evection resonance with the Sun reduced the Earth–Moon angular momentum by a factor of 2 or more. We find that the Moon's semi-major axis at the end of its accretion is approximately 7 R ⊕ , which is comparable to the location of the evection resonance for a post-impact Earth with a 2.5 h rotation period in the absence of a disc. Thus, the dynamics of the Moon's assembly may directly affect its ability to be captured into the resonance.

An Insight into the Features of the OAO-C Thermal Design

1973 ◽  
Vol 95 (4) ◽  
pp. 1039-1047 ◽  
Author(s):  
H. Fine ◽  
J. Quadrini ◽  
S. Ollendorf
Keyword(s):  
Thermal Control ◽  
Astronomical Observatory ◽  
Thermal Design ◽  
Test Bed ◽  
Large Space ◽  
Flight Data ◽  
The Earth ◽  
Ground Test ◽  
Earth Observation Satellite ◽  
Insight Into

The Orbiting Astronomical Observatory (OAO)-C was successfully launched into 400-nautical mile circular orbit on August 21, 1972. For this spacecraft, a unique sensitivity approach to the thermal design was developed which resulted in a predictal design—the merits of which should be considered for application on future spacecra. The OAO-C is also serving as a test bed for the evaluation of thermal control hardware. To provide flight data for space program applications, experiments for a new coating and four different heat pipe designs are on this spacecraft. The data derived from OAO-C will be extremely valuable for such future programs as the Large Space Telescope (LST) and the Earth Observation Satellite (EOS). This paper will describe the detailed of the sensitivity design approach and thermal control hardware. For all aspects discussed, a comparison of pertinent analysis, ground test data, and flight data [1] will be given.

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