|Latitude & Longitude (WGS84):||29° 32' North , 72° 18' East|
|Latitude & Longitude (decimal):||29.53333,72.30000|
|Locality type:||Meteorite Fall Location|
|Meteorite Class:||EL6 chondrite meteorite|
|Meteoritical Society Class:||EL6|
|Metbull:||View entry in Meteoritical Bulletin Database|
|Köppen climate type:||BWh : Hot deserts climate|
Enstatite Chondrite [EL6; S2]
Early Enstatite Chondrite fall, 13.6 kg
As dawn was breaking on 23 September 1873, a swarm of bolides were seen, detonations were almost immediately heard, and a shower of meteorites fell over a 5 km x 25 km region of the Punjab forming a number of small craters. A few stones which fell near the village of Khairpur were recovered. The Khairpur meteorite was soon recognized by G. T. Prior (1918) and others as an unusual meteorite with affinities to other meteorite oddballs such as the Daniel’s Kuil (1868) and Hvittis (1901) falls. Today we classify all three meteorites as Enstatite Chondrites, petrologic type EL6. The class name is derived from their most prominent mineral, Enstatite, an iron-poor silicate which is relatively uncommon in earth rocks. In mineralogical circles, interest has been also been piqued by the discovery of a suite of minerals unknown in terrestrial rocks. The Oldhamite in Khairpur described by Prior was an early instance of an ongoing pursuit.
Enstatite Chondrites are marked by sub-solar Mg/Si ratios, near terrestrial Oxygen-isotope ratios, abundant ‘free’ Fe-Ni metal (~10 vol%), and highly reduced mineral assemblages. Both low-iron (EL) and high-iron (EH) chemical groups have abundant Fe-Ni metal, but the (EL) group has less overall Fe content. The EL group is also distinguished by moderately large chondrules and the invariable presence of ferroan alabandite.
Most EL chondrites, including Khairpur, are designated as petrologic type EL6. Metamorphic heating has homogenized most minerals, coarsened feldspar, converted low-Ca pyroxene to orthopyroxene, and obliterated many chondrule outlines. No melting of chondrules is observed.
As the third observed Enstatite Chondrite fall and as the third most massive EL fall, Khairpur has offered both material for study and food for thought for well over a century.
14 valid minerals.
Meteorite/Rock Types Recorded
Select Rock List TypeAlphabetical List Tree Diagram
Entries shown in red are rocks recorded for this region.
This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.
Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org
2.588 - 23.03 Ma
|Cenozoic sedimentary rocks|
Age: Neogene (2.588 - 23.03 Ma)
Lithology: Sedimentary rocks
Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529.