Transition from complex craters to multi-ringed basins on terrestrial planetary bodies: Scale-dependent role of the expanding melt cavity and progressive interaction with the displaced zone

2010 ◽  
Vol 37 (2) ◽  
pp. n/a-n/a ◽  
Author(s):  
J. W. Head
Keyword(s):  
Planetary Bodies ◽  
Terrestrial Planetary Bodies

scholarly journals Scaling properties of planetary calderas and terrestrial volcanic eruptions

2012 ◽  
Vol 19 (6) ◽  
pp. 585-593 ◽  
Author(s):  
L. Sanchez ◽  
R. Shcherbakov
Keyword(s):  
Solar System ◽  
Scaling Law ◽  
Geographical Location ◽  
Internal Heat ◽  
Volcanic Eruptions ◽  
Scaling Analysis ◽  
Scaling Properties ◽  
Caldera Formation ◽  
Planetary Bodies ◽  
Terrestrial Planetary Bodies

Abstract. Volcanism plays an important role in transporting internal heat of planetary bodies to their surface. Therefore, volcanoes are a manifestation of the planet's past and present internal dynamics. Volcanic eruptions as well as caldera forming processes are the direct manifestation of complex interactions between the rising magma and the surrounding host rock in the crust of terrestrial planetary bodies. Attempts have been made to compare volcanic landforms throughout the solar system. Different stochastic models have been proposed to describe the temporal sequences of eruptions on individual or groups of volcanoes. However, comprehensive understanding of the physical mechanisms responsible for volcano formation and eruption and more specifically caldera formation remains elusive. In this work, we propose a scaling law to quantify the distribution of caldera sizes on Earth, Mars, Venus, and Io, as well as the distribution of calderas on Earth depending on their surrounding crustal properties. We also apply the same scaling analysis to the distribution of interevent times between eruptions for volcanoes that have the largest eruptive history as well as groups of volcanoes on Earth. We find that when rescaled with their respective sample averages, the distributions considered show a similar functional form. This result implies that similar processes are responsible for caldera formation throughout the solar system and for different crustal settings on Earth. This result emphasizes the importance of comparative planetology to understand planetary volcanism. Similarly, the processes responsible for volcanic eruptions are independent of the type of volcanism or geographical location.

scholarly journals Mid-infrared spectroscopy of alkali feldspar samples for space application

2020 ◽  
Vol 114 (5) ◽  
pp. 453-463 ◽  
Author(s):  
Maximilian P. Reitze ◽  
Iris Weber ◽  
Herbert Kroll ◽  
Andreas Morlok ◽  
Harald Hiesinger ◽  
...  
Keyword(s):  
Alkali Feldspar ◽  
Reference Database ◽  
Space Application ◽  
X Ray Diffraction ◽  
Exchange Method ◽  
Infrared Measurements ◽  
Planetary Bodies ◽  
Terrestrial Planetary Bodies ◽  
End Members ◽  
Alkali Feldspars

Abstract Feldspars are major components of terrestrial planetary surfaces. For future space application and the setup of a comprehensive reference database, Na- and K-rich alkali feldspars, NaAlSi3O8 – KAlSi3O8, have been investigated by infrared reflectance spectroscopy. We related the feldspar spectra to the chemical composition and state of Al,Si order/disorder. The infrared measurements were analyzed with respect to band shifts and peak shapes using the autocorrelation function. Natural samples served as starting materials. Some samples were treated by the alkali exchange method to produce pure end-members, which were then heated to generate various states of Al,Si disorder. X-ray diffraction (XRD) methods served to determine the Al,Si distribution. Our autocorrelation allowed to differentiate between the compositional and the order/disorder influences seen in the spectra in the wavelength range between 7 μm up to 14 μm (1429 cm− 1 to 714 cm− 1). Space missions often analyze the surfaces of planetary bodies using remote sensing. Therefore, our results are essential to characterize and distinguish alkali feldspars on the surfaces of terrestrial planetary bodies like Mercury.

scholarly journals D/H ratios of the inner Solar System

2017 ◽  
Vol 375 (2094) ◽  
pp. 20150390 ◽  
Author(s):  
L. J. Hallis
Keyword(s):  
Solar System ◽  
Giant Planet ◽  
Published Data ◽  
Solar System Formation ◽  
Atmospheric Processes ◽  
The Past ◽  
The Earth ◽  
Planetary Bodies ◽  
Original Water

The original hydrogen isotope (D/H) ratios of different planetary bodies may indicate where each body formed in the Solar System. However, geological and atmospheric processes can alter these ratios through time. Over the past few decades, D/H ratios in meteorites from Vesta and Mars, as well as from S- and C-type asteroids, have been measured. The aim of this article is to bring together all previously published data from these bodies, as well as the Earth, in order to determine the original D/H ratio for each of these inner Solar System planetary bodies. Once all secondary processes have been stripped away, the inner Solar System appears to be relatively homogeneous in terms of water D/H, with the original water D/H ratios of Vesta, Mars, the Earth, and S- and C-type asteroids all falling between δD values of −100‰ and −590‰. This homogeneity is in accord with the ‘Grand tack’ model of Solar System formation, where giant planet migration causes the S- and C-type asteroids to be mixed within 1 AU to eventually form the terrestrial planets. This article is part of the themed issue ‘The origin, history and role of water in the evolution of the inner Solar System’.

scholarly journals Shock effects in feldspars: An overview

2021 ◽  
Author(s):  
Annemarie E. Pickersgill ◽  
Steven J. Jaret ◽  
Lidia Pittarello ◽  
Fritz Jörg ◽  
R. Scott Harris
Keyword(s):  
Shock Waves ◽  
Hypervelocity Impact ◽  
Large Numbers ◽  
Planetary Bodies ◽  
Terrestrial Planetary Bodies ◽  
Work Done ◽  
Impact Events

ABSTRACT Feldspars are the dominant mineral in the crust of most terrestrial planetary bodies, including Earth, Earth’s moon, and Mars, as well as in asteroids, and thus in meteorites. These bodies have experienced large numbers of hypervelocity impact events, and so it is important to have a robust understanding of the effects of shock waves exerted on feldspars. However, due to their optical complexity and susceptibility to weathering, feldspars are underutilized as shock barometers and indicators of hypervelocity impact. Here, we provide an overview of the work done on shocked feldspars so far, in an effort to better frame the current strengths and weaknesses of different techniques, and to highlight some gaps in the literature.

scholarly journals Reference Surfaces and Global Figure Parameters of the Terrestrial Planetary Bodies

1990 ◽  
Vol 141 ◽  
pp. 167-168
Author(s):  
K.K. Kamensky
Keyword(s):  
Coordinate System ◽  
Inertial Coordinate System ◽  
Planetary Bodies ◽  
Terrestrial Planetary Bodies ◽  
Astronomical Constants

For connecting the inertial coordinate system with the non-inertial planetocentric one we need to know values of the fundamental astronomical constants as well as global figure parameters of the planet. We distinguish among planetary figures a dynamical, a level, and hypsometric figures.

Role of dactinomycin in the improved survival of children with Wilms' tumor

JAMA ◽  
1966 ◽  
Vol 195 (12) ◽  
pp. 1005-1009 ◽  
Author(s):  
D. J. Fernbach
Keyword(s):  
Wilms Tumor
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