• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of geophysical research. Planets >Retrieval of Compositional End-Members From Mars Exploration Rover Opportunity Observations in a Soil-Filled Fracture in Marathon Valley,Endeavour Crater Rim
【24h】

Retrieval of Compositional End-Members From Mars Exploration Rover Opportunity Observations in a Soil-Filled Fracture in Marathon Valley,Endeavour Crater Rim

机译：从火星勘探罗弗机会观察在马拉松谷的土壤骨折中检索，努力的火山口轮

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The Opportunity rover investigated a gentle swale on the rim of Endeavour crater called Marathon Valley where a series of bright planar outcrops are cut into polygons by fractures. A wheel scuff performed on one of the soil-filled fracture zones revealed the presence of three end-members identified on the basis of Pancam multispectral imaging observations covering ~0.4 to 1 μm: red and dark pebbles, and a bright soil clod. Multiple overlapping Alpha Particle X-ray Spectrometer (APXS) measurements were collected on three targets within the scuff zone. The field of view of each APXS measurement contained various proportions of the Pancam-based end-members. Application of a log maximum likelihood method for retrieving the composition of the end-members using the 10 APXS measurements shows that the dark pebble end-member is compositionally similar to average Mars soil, with slightly elevated S and Fe. In contrast, the red pebble end-member exhibits enrichments in Al and Si and is depleted in Fe and Mg relative to average Mars soil. The soil clod end-member is enriched in Mg, S, and Ni. Thermodynamic modeling of the soil clod end-member composition indicates a dominance of sulfate minerals. We hypothesize that acidic fluids in fractures leached and oxidized the basaltic host rock, forming the red pebbles, and then evaporated to leave behind sulfate-cemented soil.
机译：机会流浪者在努力呼吸口轮上调查了一个叫马拉松山谷的温和的沼泽地，其中一系列明亮的平面露头被裂缝切成多边形。在一个土壤填充的骨折区域上执行的车轮垫透露了在Pancam MultiSpectral成像观察的基础上覆盖〜0.4至1μm：红色和深色鹅卵石的三个终端构件的存在，以及明亮的土壤。在磨损区内的三个目标上收集多个重叠的α粒子X射线光谱仪（APX）测量。每个APX测量的视野包含基于Pancam的最终成员的各种比例。利用10APX测量检索端部构件的对数最大似然方法的应用表明，暗卵石末端构件与平均火星土壤合成，具有略微升高的S和Fe。相反，红卵石末端构件在Al和Si中表现出富集，并相对于平均火星土壤耗尽Fe和Mg。土壤Clod末端构件富含Mg，S和Ni。土壤Clod末端成员组合物的热力学建模表明硫酸盐矿物质的优势。我们假设骨折中的酸性液体浸出并氧化玄武岩宿主岩石，形成红卵石，然后蒸发以留下硫酸盐粘稠的土壤。

著录项

相似文献

  • 外文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号