Lithospheric accretion and destruction processes on Ganymede and Europa
- 出版日期：2000.
- 页数：258 p. :
- 第一责任说明：Louise Margaret Prockter.
- 分类号：a281
- ISBN：0599941847(ebk.) :
MARC全文
02h0023327 20110420154648.0 cr un||||||||| 110411s2000 xx ||||f|||d||||||||eng | AAI9987826 0599941847(ebk.) : CNY371.35 NGL NGL NGL a281 Prockter, Louise Margaret. Lithospheric accretion and destruction processes on Ganymede and Europa [electronic resource] / Louise Margaret Prockter. 2000. 258 p. : digital, PDF file. Source: Dissertation Abstracts International, Volume: 61-09, Section: B, page: 4622. ; Adviser: James W. Head, III. Thesis (Ph.D.) -- Brown University, 2000. Using high- and regional-resolution Galileo data, I investigate the processes by which new material is created, and old material destroyed, on the surfaces of Jupiter's icy moons, Europa and Ganymede. I show that Ganymede's dark terrain apparently consists of a “dirty” ice substrate overlain by a relatively thin low-albedo veneer of meteoritic material. This veneer becomes concentrated on the surface by the processes of sublimation, impact gardening, and mass wasting. Close to grooved terrain, dark terrain becomes increasingly fractured. Fracture formation may be concentrated within craters, or preexisting furrows. At least one groove lane, Anshar Sulcus, has formed by tectonic deformation in the form of hanging wall rollover. No evidence for cryovolcanism is found within Ganymede's dark terrain, contrary to expectations from Voyager data.;I investigate the formation of pull-apart bands on Europa, particularly within the anti-Jovian region. I show that these features form along preexisting weaknesses, possibly in more than one episode. Bands form from relatively viscous material, probably warm ice, and show several characteristics that are similar to those observed on terrestrial mid-ocean ridges, implying a similar mechanism of formation. Strike-slip movement may be very important in the formation of some bands, such as the relatively young band, Agenor Linea. I show that Europa's bands are intermediate in the stratigraphic column in the anti-Jovian region, and in all places studied are older than lenticulae. This change in the style of resurfacing on Europa may indicate the gradual freezing out of a subsurface ocean. Jupiter (Planet) Satellites. Brown University. aCN bNGL http://168.160.16.198/umi/detail_usmark.jsp?searchword=pub_number%3DAAI9987826&singlesearch=no&channelid=%CF%B8%C0%C0&record=1 NGL Bs170 rCNY371.35 ; h1 bs1104