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Allan Hills 88020 meteorite, Allan Hills, Victoria Land, Eastern Antarctica, Antarcticai
| Regional Level Types | |
|---|---|
| Allan Hills 88020 meteorite | Meteorite Fall Location |
| Allan Hills | Group of Hills |
| Victoria Land | Region |
| Eastern Antarctica | Region |
| Antarctica | Continent |
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Latitude & Longitude (WGS84):
76° 41' 22'' South , 159° 21' 21'' East
Latitude & Longitude (decimal):
Meteorite Class:
Meteoritical Society Class:
Köppen climate type:
Other/historical names associated with this locality:
ALH 88020
Ordinary chondrite, unequilibrated (H3.5; S2; W1)
Found,1988; 53.71 g
The Allan Hills 88020 (ALH 88020) meteorite is a small, unequilibrated meteorite found in Antarctica during the 1988-1989 collecting season. In thin sections its most obvious constituents are the distinct chondrules, mostly barred olivine (BO) and porphyritic pyroxene (PP), rimmed by feldspathic mesostasis. Olivine and orthopyroxene grains are also abundant within the surrounding matrix along with Fe-Ni metal and troilite. Mean olivine composition (Fo18) is characteristic of the H (high iron) ordinary chondrite group. Undulose extinction in the olivine exhibits only moderate (preterrestrial) shock (level S2). Minimal weathering (W1) is apparently due to both a relatively short terrestrial exposure age and a relatively recent removal of a protective ice cover.
A cosmic ray exposure (CRE) age of ~33.5 Ma clearly differentiated ALH 88020 from a number of somewhat similar surrounding meteorites which had apparently fallen in a single meteorite shower. Rather, the CRE age of ALH 88020 may instead be associated with a 33 Ma peak in the ages of a number of other H chondrites, especially prominent within the H6 petrologic type.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsMineral List
1 valid mineral.
Meteorite/Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
| ⓘ 'Fayalite-Forsterite Series' Description: Olivine mean composition (Fa18.0). |
| ⓘ 'Limonite' |
| ⓘ 'Meteoritic Iron' |
| ⓘ 'Orthopyroxene Subgroup' |
| ⓘ Troilite Formula: FeS |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Troilite | 2.CC.10 | FeS |
| Unclassified | |||
| ⓘ | 'Limonite' | - | |
| ⓘ | 'Fayalite-Forsterite Series' | - | |
| ⓘ | 'Meteoritic Iron' | - | |
| ⓘ | 'Orthopyroxene Subgroup' | - | |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Fayalite-Forsterite Series | |
| Mg | Magnesium | |
| Mg | ⓘ Fayalite-Forsterite Series | |
| Si | Silicon | |
| Si | ⓘ Fayalite-Forsterite Series | |
| S | Sulfur | |
| S | ⓘ Troilite | FeS |
| Fe | Iron | |
| Fe | ⓘ Troilite | FeS |
| Fe | ⓘ Fayalite-Forsterite Series | |
Other Regions, Features and Areas containing this locality
Antarctic MeteoritesGroup of Meteorite Fall Locations
Antarctic PlateTectonic Plate
- Ross Orogen
- South Victoria LandOrogenic Belt
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