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The Iapygia quadrangle is one of a series of 30 quadrangle maps of Mars used by the United States Geological Survey (USGS) Astrogeology Research Program. The Iapygia quadrangle is also referred to as MC-21 (Mars Chart-21).〔Davies, M.E.; Batson, R.M.; Wu, S.S.C. “Geodesy and Cartography” in Kieffer, H.H.; Jakosky, B.M.; Snyder, C.W.; Matthews, M.S., Eds. ''Mars.'' University of Arizona Press: Tucson, 1992.〕 The Iapygia quadrangle covers the area from 270° to 315° west longitude and from 0° to 30° south latitude on Mars. Parts of the regions Tyrrhena Terra and Terra Sabaea are found in this quadrangle. The largest crater in this quadrangle is Huygens. Some interesting features in this quadrangle are dikes,.〔Head, J. et al. 2006. The Huygens-Hellas giant dike system on Mars: Implications for Late Noachian-Early Hesperian volcanic resurfacing and climatic evolution. Geology. 34:4: 285-288.〕 the many layers found in Terby Crater, and the presence of carbonates on the rim of Huygens Crater.〔http://www.jpl.nasa.gov/news/news.cfm?release=2011-071&rn=news.xml&rst=2929〕 ==Dikes== Near Huygens, especially just to the east are a number of narrow ridges which appear to be the remnants of dikes, like the ones around Shiprock, New Mexico. The dikes were once under the surface, but have now been eroded. Dikes are magma-filled cracks that often carry lava to the surface. Dikes by definition cut across rock layers. Some dikes on earth are associated with mineral deposits.〔 Discovering dikes on Mars means that perhaps future colonists will be able to mine needed minerals on Mars, instead of transporting them all the way from the Earth. Image:Dike near Hygens.JPG|Dike near the crater Huygens shows up as narrow dark line running from upper left to lower right, as seen by THEMIS. ESP 036909 1675iapygiaridge.jpg|Possible dikes, as seen by HiRISE under HiWish program Arrows point to possible dikes, which appear as relatively straight, narrow ridges. ESP 042830 1675dikes.jpg|Possible dike, as seen by HiRISE under HiWish program 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Iapygia quadrangle」の詳細全文を読む スポンサード リンク
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