[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-detail-228265-en":3,"doc-seo-228265-105":30,"detail-sidebar-cat-0-en-105":96},{"code":4,"msg":5,"data":6},0,"success",{"doc_id":7,"user_id":8,"nickname":9,"user_avatar":10,"doc_module":4,"category_id":11,"category_name":12,"doc_title":13,"doc_description":14,"doc_content":15,"file_id":16,"file_url":17,"file_type":18,"file_size":19,"view_count":20,"is_deleted":4,"is_public":20,"is_downloadable":20,"audit_status":20,"page_count":21,"language":22,"language_code":23,"site_id":24,"html_lang":23,"table_of_contents":25,"faqs":26,"seo_title":27,"seo_description":14,"update_tm":28,"read_time":29},228265,16904993612988,"Olivia Brown","https://ap-avatar.wpscdn.com/davatar_a8503ba1806abce46bf441b54a3ca4cd",8,"Research & Report","GEOLOGIC MAPPING IN THE HESPERIA PLANUM REGION OF MARS - Tracy K.P. Gregg and David A. Crown","Geologic mapping in the Hesperia Planum region of Mars targets the stratigraphic relationships among wrinkle-ridged plains units and volcanic deposits associated with Tyrrhenus Mons. The study addresses evidence that Hesperia Planum may not consist of identical materials emplaced at a single geologic time. Using 1:1.5M-scale mapping and continued work on Mars Transverse Mercator quadrangles at 1:500,000, the effort refines unit boundaries and relative ages, clarifies the extent of eruptive materials, and characterizes erosional morphology. Current results include multiple distinct plains units and a youngest “dark lobate plains” unit that embays volcanic edifice materials.","GEOLOGIC MAPPING IN THE HESPERIA PLANUM REGION OF MARS. Tracy K.P. Gregg 1 and David A. Crown2,1Dept. of Geology, 411 Cooke Hall, University at Buffalo, Buffalo, NY 14260 ([tgregg@buffalo.edu](tgregg@buffalo.edu)), 2Planetary Science Institute, 1700 E. Ft. Lowell, Suite 106, Tucson, AZ 85719 ([crown@psi.edu](crown@psi.edu)) .  \nIntroduction: Hesperia Planum, characterized by a high concentration of mare-type wrinkle ridges and ridge rings [1-4], encompasses > 2 million km2 in the southern highlands of Mars (Fig. 1) . The most common interpretation is that the plains were emplaced as“flood” lavas with total thicknesses of \u003C3 km [4-10] . The wrinkle ridges on its surface make Hesperia Planum the type locale for “Hesperian-aged ridged plains” on Mars [e.g., 9], and wrinkle-ridge formation occurred in more than one episode [4] . Hesperia Planum’s stratigraphic position and crater-retention age [e.g., 9, 11-12] define the base of the Hesperian System. However, preliminary results of geologic mapping reveal that the whole of Hesperia Planum is unlikely to be composed of the same materials, emplaced at the same geologic time. To unravel these complexities, we are generating a 1:1.5M-scale geologic map of Hesperia Planum and its surroundings (Fig. 1) . To date, we have identified 4 distinct plains units within Hesperia Planum and are attempting to determine the nature and relative ages of these materials (Fig. 2) [13-15] .  \nFigure 1. Gridded MOLA data (128 pixels/degree) of the Hesperia Planum region being mapped at 1:1 .5 million. Reds are topographic highs (Tyrrhena Patera summit is ~3 km above mean planetary radius) and blues are lows. Locations of MTM quadrangles-15257 and-20257 noted.  \nFigure 2. Rough boundaries of identified plains materials within Hesperia Planum. Portions of these materials were originally mapped as “Hesperian-aged ridged plains” at 1:15 million [9] .  \nHesperia Planum contains the volcano Tyrrhenus Mons, and embays the eastern flanks of the volcano. A large (~1000 km x 300 km) lava flow field, connected to the Tyrrhena Patera summit caldera complex via a volcano-tectonic rille, is superposed on the surrounding plains materials [16, 17] . Thus, the volcanic activity at Tyrrhenus Mons both pre-dates and postdates the emplacement of at least some Hesperia Planum materials. To constrain and elucidate the relation between Hesperia Planum and Tyrrhenus Mons deposits, we are completing the geologic mapping of Mars Transverse Mercator (MTM) quadrangles-20257 and-15257 (Figure 3) at 1:500,000 [18] . These quadrangles are located to the west of the Tyrrhenus Mons summit, and contain the western boundary of Hesperia Planum as well. Mapping is almost completed for these quadrangles. Important discoveries as a result of geologic mapping include the extent of Tyrrhenus Mons eruptive materials, and the erosional morphology of these materials.  \nHesperia Planum Materials: The region of Hesperia Planum located to the east of Tyrrhenus Mons (Fig. 2) is the typical “Hesperian ridged plains” [7, 9] . Aside from Tyrrhena Patera, no obvious volcanic vents  \nhave been found within Hesperia Planum [cf. 4, 12, 17-20] . Lava flows can be seen at available image resolutions in the Tyrrhenus Mons lava flow field [17] that post-date the ridged plains, but they are not readily apparent within the ridged plains. In eastern Hesperia Planum, we have identified the following plains units: highland knobby plains, smooth plains, highland smooth plains, and knobby plains. Less than a dozen narrow (\u003C100 m wide), linear to sinuous channels have been observed within Hesperia Planum (approximately 6 have been seen within the Tyrrhenus Mons MTM quadrangles-15257 and-20257) . These channels have no obvious source or deposits associated with them, and regrettably High Resolution Imaging Science Experiment (HiRISE) images (25 cm/pixel) reveal that these channels are covered with secondary aeolian bedforms. Although their origin remains unclear, their ","cbCaihkFL0pphkUO","https://ap.wps.com/l/cbCaihkFL0pphkUO","pdf",480903,1,2,"English","en",105,"# Introduction\n## Hesperia Planum context and mapping goals\n# Hesperia Planum Materials\n## Plains units and channel observations\n## Further subdivision in MTM quadrangles\n# Tyrrhenus Mons Materials\n## Previous mapping and newly identified units","[{\"question\":\"What is the primary goal of the geologic mapping in Hesperia Planum?\",\"answer\":\"To resolve complexities in the stratigraphy and relative ages of plains materials and their relationship to Tyrrhenus Mons deposits by producing detailed geologic maps of Hesperia Planum and surrounding areas.\"},{\"question\":\"How are Hesperia Planum materials characterized in the mapping?\",\"answer\":\"The mapping identifies multiple distinct plains units, including highland knobby plains, smooth plains, highland smooth plains, and knobby plains, and notes that cross-cutting relations are limited between these units.\"},{\"question\":\"What new observations connect Tyrrhenus Mons activity with Hesperia Planum deposits?\",\"answer\":\"The study refines the extent of Tyrrhenus Mons eruptive materials and describes erosional morphology, including evidence that volcanic activity both predates and postdates emplacement of at least some Hesperia Planum materials, plus identification of newly mapped stratigraphically underlying edifice units.\"}]","GEOLOGIC MAPPING IN THE HESPERIA PLANUM REGION OF MARS - Tracy K.P. 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Crown | PDF",1789023992,5,{"code":4,"msg":31,"data":32},"ok",{"site_id":24,"language":23,"slug":33,"title":13,"keywords":34,"description":14,"schema_data":35,"social_meta":91,"head_meta":93,"extra_data":95,"updated_unix":28},"geologic-mapping-in-the-hesperia-planum-region-of-mars-tracy-kp-gregg-and-david-a-crown","",{"@graph":36,"@context":90},[37,53,73],{"@type":38,"itemListElement":39},"BreadcrumbList",[40,44,47,50],{"item":41,"name":42,"@type":43,"position":20},"https://docshare.wps.com","Home","ListItem",{"item":45,"name":46,"@type":43,"position":21},"https://docshare.wps.com/document/","Document",{"item":48,"name":12,"@type":43,"position":49},"https://docshare.wps.com/document/research-report/",3,{"item":51,"name":13,"@type":43,"position":52},"https://docshare.wps.com/document/geologic-mapping-in-the-hesperia-planum-region-of-mars-tracy-kp-gregg-and-david-a-crown/228265/",4,{"url":51,"name":13,"@type":54,"image":55,"author":60,"headline":13,"publisher":62,"fileFormat":65,"inLanguage":23,"description":14,"dateModified":66,"datePublished":67,"encodingFormat":65,"isAccessibleForFree":68,"interactionStatistic":69},"DigitalDocument",{"url":56,"@type":57,"width":58,"height":59},"https://docshare.wps.com/thumbnails/geologic-mapping-in-the-hesperia-planum-region-of-mars-tracy-kp-gregg-and-david-a-crown/228265.png","ImageObject",300,407,{"name":9,"@type":61},"Person",{"url":41,"name":63,"@type":64},"DocShare","Organization","application/pdf","2026-09-11","2026-09-10",true,{"@type":70,"interactionType":71,"userInteractionCount":20},"InteractionCounter",{"@type":72},"ViewAction",{"@type":74,"mainEntity":75},"FAQPage",[76,82,86],{"name":77,"@type":78,"acceptedAnswer":79},"What is the primary goal of the geologic mapping in Hesperia Planum?","Question",{"text":80,"@type":81},"To resolve complexities in the stratigraphy and relative ages of plains materials and their relationship to Tyrrhenus Mons deposits by producing detailed geologic maps of Hesperia Planum and surrounding areas.","Answer",{"name":83,"@type":78,"acceptedAnswer":84},"How are Hesperia Planum materials characterized in the mapping?",{"text":85,"@type":81},"The mapping identifies multiple distinct plains units, including highland knobby plains, smooth plains, highland smooth plains, and knobby plains, and notes that cross-cutting relations are limited between these units.",{"name":87,"@type":78,"acceptedAnswer":88},"What new observations connect Tyrrhenus Mons activity with Hesperia Planum deposits?",{"text":89,"@type":81},"The study refines the extent of Tyrrhenus Mons eruptive materials and describes erosional morphology, including evidence that volcanic activity both predates and postdates emplacement of at least some Hesperia Planum materials, plus identification of newly mapped stratigraphically underlying edifice units.","https://schema.org",{"og:url":51,"og:type":92,"og:title":13,"og:site_name":63,"og:description":14},"article",{"robots":94,"canonical":51},"index,follow",{"doc_id":7,"site_id":24},{"code":4,"msg":5,"data":97},[98,102,106,110,114,119,124,127,132,135,139],{"id":20,"doc_module":4,"doc_module_name":46,"category_name":99,"show_sort_weight":100,"slug":101},"Story & Novel",90,"story-novel",{"id":21,"doc_module":4,"doc_module_name":46,"category_name":103,"show_sort_weight":104,"slug":105},"Literature",80,"literature",{"id":52,"doc_module":4,"doc_module_name":46,"category_name":107,"show_sort_weight":108,"slug":109},"Exam",70,"exam",{"id":29,"doc_module":4,"doc_module_name":46,"category_name":111,"show_sort_weight":112,"slug":113},"Comic",60,"comic",{"id":115,"doc_module":4,"doc_module_name":46,"category_name":116,"show_sort_weight":117,"slug":118},6,"Technology",50,"technology",{"id":120,"doc_module":4,"doc_module_name":46,"category_name":121,"show_sort_weight":122,"slug":123},7,"Healthcare",40,"healthcare",{"id":11,"doc_module":4,"doc_module_name":46,"category_name":12,"show_sort_weight":125,"slug":126},30,"research-report",{"id":128,"doc_module":4,"doc_module_name":46,"category_name":129,"show_sort_weight":130,"slug":131},9,"Religion & Spirituality",20,"religion-spirituality",{"id":130,"doc_module":4,"doc_module_name":46,"category_name":133,"show_sort_weight":130,"slug":134},"World Cup","world-cup",{"id":136,"doc_module":4,"doc_module_name":46,"category_name":137,"show_sort_weight":136,"slug":138},10,"Lifestyle","lifestyle",{"id":140,"doc_module":4,"doc_module_name":46,"category_name":141,"show_sort_weight":29,"slug":142},19,"General","general"]