Thickness of Impact Crater Ejecta on the Lunar Surface PDF Download

Author: Nicholas Martin Short
Publisher:
ISBN:
Category : Lunar craters
Languages : en
Pages : 75

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Author: Grant Heiken
Publisher: CUP Archive
ISBN: 9780521334440
Category : Science
Languages : en
Pages : 796

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The only work to date to collect data gathered during the American and Soviet missions in an accessible and complete reference of current scientific and technical information about the Moon.

Author: Gwendolyn Diane Bart
Publisher:
ISBN:
Category :
Languages : en
Pages : 174

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Finally, I describe the morphology of some lunar crater wall landslides that strongly resemble martian gullies, despite the lack of geologically active water on the Moon today or in the past. The lunar features indicate that alcove-channel-apron morphology, attributed on Mars to seepage of liquid water, can also form via a dry landslide mechanism. Therefore alcove-channel-apron morphology is not diagnostic of water carved gullies.

Author: Manned Spacecraft Center (U.S.)
Publisher:
ISBN:
Category : Apollo Lunar Surface Experiments Package
Languages : en
Pages : 328

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"Apollo 14, the third mission during which men have worked on the surface of the Moon, was highly successful. This mission to the Fra Mauro Formation provided geophysical data from a new set of instruments... Because of improved equipment, such as the modularized equipment transporter, and because of the extended time spent on the lunar surface, a large quantity and variety of lunar samples were returned to Earth for detailed examination. New information concerning the mechanics of the lunar soil was also obtained during this mission. In addition, five lunar-orbital experiments were conducted during the Apollo 14 mission, needing no new equipment other than a camera. The experiments were executed by the command module pilot in the command and service module while the commander and the lunar module pilot were on the surface of the Moon. This report is preliminary in nature; however, it is meant to acquaint the reader with the actual conduct of the Apollo 14 scientific mission and to record the facts as they appear in the early stages of the scientific mission evaluation. As far as possible, data trends are reported, and preliminary results and conclusions are included."--p. xi.

Author: Michael Raymond Zanetti
Publisher:
ISBN:
Category : Cratering
Languages : en
Pages : 0

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The formation of an impact crater ejecta blanket can be viewed as a form of organized chaos. Material that is ejected from a crater is heavily brecciated, but falls back to the surface along ballistic trajectories, generally preserving an inverted sense of the original stratigraphy. As the ejecta re-impacts the area surrounding the crater it forms a thick blanket of ejected material and reworked target surface that gradually thins away from the crater rim. Within the crater, crater modification processes, such as wall terrace formation and impact melt drainage, transform the crater in expectable ways. The approach adopted in this research is to use what is known about impact cratering and ejecta emplacement processes to geologically map craters on the Moon using remote-sensing data, determine the timing of individual impacts on the Moon, and investigate terrestrial impact melt glass. Research has been divided into three parts: 1) a detailed geomorphologic and geologic map of the lunar crater Aristarchus; 2) detailed crater size-frequency distribution measurements on the ejecta blankets of the lunar craters Aristarchus and Tycho; and 3) characterization of zircon decomposition in impact melt glass from the Mistastin Lake impact structure, Labrador, Canada. Mapping the geomorphology and geology of Aristarchus has shown that there are differences in the distribution of morphologic and compositional units related to pre-existing topography. I use the basic principles of inverted stratigraphy and remote-sensing data to investigate the geology of the subsurface material excavated by the crater and determine that Aristarchus likely excavated a buried pluton, or hypabyssal intrusive body, related to the large, possibly bi-modal, Cobra Head volcanic complex on the southern Aristarchus Plateau. Measuring crater size-frequency distributions on the ejecta blankets of Aristarchus and Tycho were done to determine the timing of these impacts; however, my measurements revealed that there is a significant difference in crater density, irrespective of crater diameter, between impact melt and ejecta blanket units. I show that the difference in crater density between these units can most likely be explained by a mechanism of self-secondary cratering, where late-arriving fragments of ejecta crater the surface of the ejecta blanket after it forms, but prior to the arrival of impact melt flows. These measurements call into question the long-held notion that ejecta blankets represent completely resurfaced units through ballistic sedimentation, free of impact craters immediately after formation, and these measurements suggest that cratering flux over the last billion years of the Solar System may be considerably lower. Lastly, I use field observations and a number of state-of-the-art laboratory analyses of a sample of impact melt glass from the Mistastin Lake impact structure to study the decomposition of zircon grains and the provenance of the impact melt. From my measurements, I show that zircon grains from a mangerite target rock were entrained in a superheated melt of very low viscosity and quenched, preserving high temperature mineral phases, and revealing how zircon grains undergo decomposition in a natural sample.

Author: David Hurd
Publisher:
ISBN:
Category : Braille books
Languages : en
Pages : 8

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The phases bring the Moon to life and highlight the complex moonscape of hills and ridges and dark and light areas. This book is designed to give you the basics about the craters that are found on the Moon.

Author: G. R. Osinski
Publisher: John Wiley & Sons
ISBN: 140519829X
Category : Science
Languages : en
Pages : 362

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Book Description
Impact cratering is arguably the most ubiquitous geological process in the Solar System. It has played an important role in Earth’s history, shaping the geological landscape, affecting the evolution of life, and generating economic resources. However, it was only in the latter half of the 20th century that the importance of impact cratering as a geological process was recognized and only during the past couple of decades that the study of meteorite impact structures has moved into the mainstream. This book seeks to fill a critical gap in the literature by providing an overview text covering broad aspects of the impact cratering process and aimed at graduate students, professionals and researchers alike. It introduces readers to the threat and nature of impactors, the impact cratering process, the products, and the effects – both destructive and beneficial. A series of chapters on the various techniques used to study impact craters provide a foundation for anyone studying impact craters for the first time.

Author: Henry J. Moore
Publisher:
ISBN:
Category : Cryptoexplosion structures
Languages : en
Pages : 60

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Author: Manned Spacecraft Center (U.S.)
Publisher:
ISBN:
Category : Astronautics
Languages : en
Pages : 656

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Preliminary results of Apollo 16 investigations.

Author: Ralph Belknap Baldwin
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 556

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