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Volcanic ash in Meridiani Planum火山灰在子午线平原

(2010-05-13 22:47:00)
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分类: 科学

Volcanic ash in Meridiani Planum 火山灰在子午线平原

 

 


 

Volcanic <wbr>ash <wbr>in <wbr>Meridiani <wbr>Planum火山灰在子午线平原

在子午线平原火山灰存款 Volcanic ash deposits in Meridiani Planum


2010年5月12日 12 May 2010
颜色的火山灰沉积这个子午线平原认为,正如火星快车高分辨率立体照相机看到。 Deposits of volcanic ash colour this view of the Meridiani Planum, as seen by the Mars Express High Resolution Stereo Camera. 他们还给予线索风向在这个火星区域。 They also give clues to the prevailing wind direction in this region of Mars.

Volcanic <wbr>ash <wbr>in <wbr>Meridiani <wbr>Planum火山灰在子午线平原

Meridiani Planum


 
子午线平原,一个在火星南部高地平原北缘,是成功的一半塔尔西斯火山地区之间的方式向西部和低洼海拉斯盆地平原的影响,南,东部。 Meridiani Planum, a plain at the northern edge of the southern highlands of Mars, is half way between the volcanic Tharsis Region to the west and the low-lying Hellas Planitia impact basin to the south-east. 通过望远镜,子午线平原的一个鲜明的,黑暗的特点,接近火星赤道。 Through a telescope, Meridiani Planum is a striking, dark feature, close to the martian equator.


Volcanic <wbr>ash <wbr>in <wbr>Meridiani <wbr>Planum火山灰在子午线平原
鉴于子午线平原透视 Perspective view of Meridiani Planum
子午线平原扩展了63公里127公里,占地约8000平方公里,大约是塞浦路斯面积。 Meridiani Planum extends 127 km by 63 km and covers an area of roughly 8000 sq km, which is about the size of Cyprus. 它被选为一个火星的地理坐标系统的中心参考点。 It was chosen as a central reference point for Mars' geographical coordinate system. 因此,火星本初子午线,在格林威治,英国,地球上的本初子午线,相等于已被设置为贯穿这一地区。 So the martian prime meridian, the equivalent of the Greenwich, UK, prime meridian on Earth, has been set to run through this region.


 
Volcanic <wbr>ash <wbr>in <wbr>Meridiani <wbr>Planum火山灰在子午线平原
子午线平原的中央火山口 Meridiani Planum's central crater
高分辨率立体相机(HRSC)采取这一形象。 The High-Resolution Stereo Camera (HRSC) took this image. 这是9月1日获得2005年,在轨2097,在每一个像素约13米的分辨率。 It was obtained on 1 September 2005, during orbit 2097, at a resolution of about 13 m per pixel.

在图像的中心,一个陨石坑地面将近50公里宽覆盖着黑色的物质。 In the centre of the image, the floor of an impact crater almost 50 km wide is covered in dark material. 这类似于火山灰,这是主要组成矿物如辉石和橄榄石。 This resembles volcanic ash, which is predominantly composed of minerals such as pyroxene and olivine. 通过黑暗覆盖挑逗小土堆,可能更多的材料制成。 Poking through the dark covering are small mounds, probably made of more resistant material. 他们周围的软物质已被侵蚀和吹制出的东北风火山口,现在的形式对周围环境的暗条纹。 The softer material around them has been eroded and blown out of the crater by north-easterly winds and now forms dark streaks on the surroundings.


Volcanic <wbr>ash <wbr>in <wbr>Meridiani <wbr>Planum火山灰在子午线平原
特征火星子午线平原地区 Features in Meridiani Planum region of Mars

一个陨石坑仅15公里宽,到左上角,在其展品的相同西南部边缘黑色的物质。 An impact crater just 15 km wide, to the upper left, exhibits the same dark material on its south-western edge. 很可能,这种材料是从大到一个较小的火山口吹。 It is likely that this material was blown into the smaller crater from the larger one. 近黑色的结构是几乎可以肯定的火山灰丰富的沉积物了沙丘。 The nearly black structures are almost certainly dunes made of volcanic ash-rich sediments. 相比之下,34公里宽的陨石坑,以图像的右下角,主要是充满了轻型材料。 In contrast, the 34-km-wide impact crater to the lower right of the image is largely filled with light material.


南部地区,到下面的小弹坑图像左右,展品黑暗的功能。 The southern area, to the left of the image below the smaller crater, exhibits dark features. 在山脊位于背风面,这些都是灰丰富的物质可能类似存款,再吹出来的火山口。 Located on the lee side of ridges, these are probably similar deposits of ash-rich material, again blown out of the crater.


Volcanic <wbr>ash <wbr>in <wbr>Meridiani <wbr>Planum火山灰在子午线平原
高程的子午线平原 Elevation of the Meridiani Planum


Volcanic <wbr>ash <wbr>in <wbr>Meridiani <wbr>Planum火山灰在子午线平原
子午线平原高分辨率 Meridiani Planum in high resolution


Volcanic <wbr>ash <wbr>in <wbr>Meridiani <wbr>Planum火山灰在子午线平原
陨石坑在火星子午线平原地区 Craters in Meridiani Planum region of Mars


Volcanic <wbr>ash <wbr>in <wbr>Meridiani <wbr>Planum火山灰在子午线平原

鉴于子午线平原透视 Perspective view of Meridiani Planum

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