File:PIA21500-Mars-GaleCrater-LakeStratification.png

本预览的尺寸：799 × 286像素。其他分辨率：320 × 115像素 | 640 × 229像素 | 1,024 × 367像素 | 2,692 × 964像素。

原始文件 ‎（2,692 × 964像素，文件大小：95 KB，MIME类型：image/png）

本文件并非来自中文维基百科，而是来自维基共享资源。请参阅维基共享资源上的详细描述、讨论页、页面历史、日志。

维基共享资源是一个储存自由版权作品的项目。您可以向此项目作出贡献。

摘要

描述	English: PIA21500: Diagram of Lake Stratification on Mars https://photojournal.jpl.nasa.gov/catalog/PIA21500 This diagram presents some of the processes and clues related to a long-ago lake on Mars that became stratified, with the shallow water richer in oxidants than deeper water was. The sedimentary rocks deposited within a lake in Mars' Gale Crater more than three billion years ago differ from each other in a pattern that matches what is seen in lakes on Earth. As sediment-bearing water flows into a lake, bedding thickness and particle size progressively decrease as sediment is deposited in deeper and deeper water as seen in examples of thick beds (PIA19074) from shallowest water, thin beds (PIA19075) from deeper water and even thinner beds (PIA19828) from deepest water. At sites on lower Mount Sharp, inside the crater, measurements of chemical and mineral composition by NASA's Curiosity Mars rover reveal a clear correspondence between the physical characteristics of sedimentary rock from different parts of the lake and how strongly oxidized the sediments were. Rocks with textures indicating that the sediments were deposited near the edge of a lake have more strongly oxidized composition than rocks with textures indicating sedimentation in deep water. For example, the iron mineral hematite is more oxidized than the iron mineral magnetite. An explanation for why such chemical stratification occurs in a lake is that the water closer to the surface is more exposed to oxidizing effects of oxygen in the atmosphere and ultraviolet light. On Earth, a stratified lake with a distinct boundary between oxidant-rich shallows and oxidant-poor depths provides a diversity of environments suited to different types of microbes. If Mars has ever hosted microbial live, the stratified lake at Gale Crater may have similarly provided a range of different habitats for life. NASA's Jet Propulsion Laboratory, a division of the California Institute of Technology, Pasadena, manages the Mars Science Laboratory Project for NASA's Science Mission Directorate, Washington. JPL designed and built the project's Curiosity rover. Malin Space Science Systems, San Diego, built and operates the rover's Mastcam. More information about Curiosity is online at http://www.nasa.gov/msl and http://mars.jpl.nasa.gov/msl/.
日期	2017年6月1日
来源	https://photojournal.jpl.nasa.gov/jpeg/PIA21500.jpg
作者	NASA/JPL-Caltech/Stony Brook University

本图像或视频收录于美国国家航空航天局（NASA）喷气推进实验室（Jet Propulsion Laboratory），其照片编号是： PIA21500

此标签不表示文件的著作权状态。任何文件在附有此标签的同時还需要一个有效的著作权标签。请参阅许可协议说明页面以了解更多信息。

其他语言：

العربية ∙ беларуская (тарашкевіца) ∙ български ∙ català ∙ čeština ∙ dansk ∙ Deutsch ∙ English ∙ español ∙ فارسی ∙ français ∙ galego ∙ magyar ∙ հայերեն ∙ Bahasa Indonesia ∙ italiano ∙ 日本語 ∙ македонски ∙ മലയാളം ∙ Nederlands ∙ polski ∙ português ∙ русский ∙ sicilianu ∙ slovenščina ∙ Türkçe ∙ українська ∙ 简体中文 ∙ 繁體中文 ∙ +/−

许可协议

	本文件完全由NASA创作，在美国属于公有领域。根据NASA的版权方针，NASA的材料除非另有声明否则不受版权保护。（参见Template:PD-USGov/zh、NASA版权方针页面或JPL图片使用方针。）
	警告: 使用NASA的标志、徽章、徽标等受到美国法律14 CFR 1221的限制。 NASA网站大量存储来自苏联或俄罗斯航天机构的图片，以及其他非美国的航天机构图片。这些文件不一定属于公有领域。根据哈勃空间望远镜的数据制作的材料，如果不是明确声明由STScI提供，则可能受到版权保护。[1]参见{{PD-Hubble}}和{{Cc-Hubble}}。 SOHO（ESA和NASA）联合项目表示，由旗下的探测器创作的材料受版权保护，且对于商业性非教育目使用材料需要授权。[2] 每日一天文图（APOD）网站上展示的图片可能受到版权保护。[3] 国家太空科学数据中心（NSSDC）网站据信存储了受版权保护内容。其图库常见问答表明除非另有声明，图库的所有图片都属于公有领域。

文件历史

点击某个日期/时间查看对应时刻的文件。

	日期/时间	大小	用户	备注
当前	2021年10月17日 (日) 19:35	2,692 × 964（95 KB）	Cherurbino	cropped white space from sides
	2021年10月17日 (日) 18:34	2,858 × 1,213（98 KB）	Cherurbino	same size, smaller weight
	2017年6月1日 (四) 20:08	2,858 × 1,213（593 KB）	Drbogdan	User created page with UploadWizard