Cape York Meteorite

The Cape York meteorite, also known as the Innaanganeq meteorite, is one of the largest known iron meteorites, classified as a medium octahedrite in chemical group IIIAB. In addition to many small fragments, at least eight large fragments with a total mass of 58 tonnes have been recovered, the largest weighing . The meteorite was named after Cape York, a prominent geographic feature located approximately west of the east coast of Meteorite Island and the nearby peninsulas in northern Melville Bay, Greenland, where the first meteorite fragments were discovered.

The date of the meteorite fall is debated, but was likely within the last few thousand years. It was known to the Inughuit (the local Inuit) for centuries, who used it as a source of meteoritic iron for tools. The first foreigner to reach the meteorite was Robert Peary in 1894, with the assistance of Inuit guides. Large pieces are on display at the American Museum of Natural History and the Natural History Museum of Denmark.

History

Presumably the meteorite fell to Earth a few thousand years ago. Some estimates have put the date of the fall as 10,000 years ago.
All fragments recovered were found at the surface, partly buried, some on unstable terrain. The largest fragment was recovered in an area where the landscape consists of "flowing" gravel or clay-like sediments on permafrost. There are mainly two hypotheses being discussed: the meteorites fell in an unknown place in Greenland, but were carried by glaciers to their current locations, or they fell directly to where they were found after the glaciers had retreated.

Presumably, none of the people saw the fall. Although, based on legends told by locals to Western travelers, there are some dubious grounds to assume that the fall happened after the first people, known as the Dorset people, arrived in these places in the 7th and 8th century AD. Later Inuit people referred to the known meteorite fragments under the general name ''Saviksue'' (Great Irons). The three most important fragments, according to the legend told to Robert Peary, were Inuit sewing woman (''the Woman'') with her tent (''the Tent'') and curled up dog (''the Dog'') who had been all hurled from heaven by the evil spirit Tornarsuk. For centuries, Inuit living near the meteorites used them as a source of metal for tools and harpoons. The Inuit would work the metal using cold forging, that is, by hammering the metal with stones. Excavations of a medieval Norse farm in the modern day Nuuk area in 1976 revealed an arrowhead made of iron from the meteorite. Its presence is evidence of the connections between Greenland Norse and northern Greenland. Other pieces of Cape York meteoritic iron dating prior to 1450 (i.e. before the Little Ice Age) have been found throughout the Arctic Archipelago and on the North American mainland, and are evidence of an extensive Thule culture trade network which supplied iron to First Nations peoples prior to European contact.

In 1818, the British First Ross Expedition (led by Captain John Ross) made contact with Inuit on the northern shore of Melville Bay, who stated they had settled in the area to exploit a nearby source of iron. The Inuit loosely described the location of this iron as Sowallick (probably this refers to Savilik which in Greenlandic means ‘with knife’), but poor weather and sea ice prevented Ross from investigating further. Ross correctly surmised that the large iron rocks described by the Inuit were meteorites, and purchased several tools with blades made of the meteoritic iron.

Between 1818 and 1883, several further expeditions to the area were mounted by Britain, Sweden, and Denmark, which all failed to find the source of the meteoritic iron. Gradually, more and more iron objects were found on the west coast of Greenland. In 1870, Nordenskiöld located the main source of this iron at Ovifak (Uivfaq) on the south coast of Disko Island. But it soon became clear that this iron mass was of terrestrial origin. By the end of the century, the Sowallick irons had been discredited as meteorites.

Only in 1894 did a Western explorer reach the meteorite: Robert E. Peary, of the US Navy. Peary enlisted the help of a local Inuit guide, who brought him to the vicinity of the island now known as Meteorite island. Peary dedicated three years to planning and executing the removal of the meteorite, a process which required, among other things, the construction of a short "railroad" of heavy timbers. In 1895 he managed to transport two smaller fragments (''the Woman'' and ''the Dog''). In 1897, after great effort, he managed to obtain the third and the largest fragment (''the Tent''). The curious name ''“Ahnighito”'' was given to the meteorite by Peary’s daughter during a “baptizing” ceremony. Her middle name was Ahnighito, which is likely an anglophile version of the Inuit name Arnakitsoq (the name of the daughter’s nanny). Peary sold this specimen for $40,000 (equivalent to $ in ) to the American Museum of Natural History in New York, where all three of the first discovered Cape York fragments are still on display. ''Ahnighito'' is the second heaviest meteorite known to date (after the Hoba meteorite in Namibia) and the heaviest meteorite to have been relocated. It is so heavy that it was necessary to build its display stand so that the supports reached directly to the bedrock below the museum.

During his expedition to retrieve the meteorite, Peary convinced six Inughuit Greenlandic Inuit people ("three men, one woman, a boy, and a girl"), including Minik Wallace, to travel with him in the United States for study at the American Museum of Natural History, where four died within a few months. Later Peary has received significant criticism for his treatment of the Inuit.

A fourth large piece of the meteorite, 3.4 tonne Savik I, was discovered in 1913 on the promontory Saveqarfik, 10 km east of Woman-Dog location, but had evidently also been known to previous generations of Eskimos, since basaltic hammer stones were located around it. Due to World War I it was left at the scene of its discovery until 1923-24 when the mass was brought down from the top of the cliff to the seashore and transported across 25 km of sea ice to the Bushnan Island. Here, open water allowed the ship Sokongen to pick it up and sail with it to Copenhagen where it was unloaded in 1925 and thoroughly described.

Thule meteorite was found relatively close to Thule town and Thule Air Base in 1955 by a group of American glaciologists who surveyed the glacier flowing from Blue Ice Valley into the Moltke Glacier. The meteorite was resting as a boulder between gneissic boulders on a nunatak protruding through the glaciers which are heading for Wolstenholme Fjord. The meteorite has the shape and size of a resting goose, measuring 35 x 30 x 20 cm in the greatest dimensions and weighing 48.6 kg. Its distinctive feature is the "neck and head," a narrow extension of the massive meteorite, measuring about 10 x 3 x 10 cm. It appears that it was formed by fragmentation and sculpturing during the atmospheric flight.

After the local people had been encouraged to report any unusual boulder in the Cape York area, in 1961 a small, complete mass of 7.8 kg, Savik II, was discovered at the coast 1 km east of the site of Savik I. It was found between gneissic boulders at the foot of a cliff by the Eskimo Augo Suerssaq while on a hunting trip.

In 1963, a fifth major piece of the Cape York meteorite was discovered by on Agpalilik peninsula. The , also known as ''the Man'', weighs about , and it is currently on display in the Geological Museum of the University of Copenhagen, Denmark.

Tunorput mass was found in September 1984 by Jeremias Petersen, a hunter from the settlement Savigsivik, on the east coast of the Meteorite island near the Ahnighito mass original location. It is probably the first meteorite ever to be found in the ocean. It was lying very close to the shore, and was exposed at low tide. Surveys of the area with a magnetometer in 2012 and georadar in 2014 found no evidence of further large iron fragments on Meteorite island, either buried or on the surface.

Numerous other small meteorite fragments have been found over the past century, as well as a variety of meteoritic iron artifacts. Most of the finds are not precisely coordinated and are not particularly useful for determining the expected meteorite strewn field, but they do reflect the important role that the Cape York meteorite once played as a major source of iron for local people.

Specimens

Composition and classification

It is an iron meteorite (medium octahedrite) and belongs to the chemical group IIIAB. The main distinguishing feature of meteoric iron is the high nickel content in its composition. There are abundant elongated troilite nodules. The troilite nodules contain inclusions of chromite, sulfides, phosphates, silica and copper. The rare nitride mineral carlsbergite (CrN) occurs within the matrix of the metal phase. Graphite was not observed and the nitrogen isotopes are in disequilibrium.

In popular culture

* In the manga and anime series '' JoJo's Bizarre Adventure'', the '' Diamond is Unbreakable'' and '' Golden Wind'' story arcs prominently feature a set of six arrows which are made out of meteoric iron sourced from the Cape York meteorite.

See also

* Glossary of meteoritics
* History of ferrous metallurgy
* List of largest meteorites on Earth
* Archaeometallurgy
* Inuit culture
* Meteoric iron

Notes

References

Bibliography

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External links

American Museum of Natural History

www.meteoritestudies.com

Cape York on the Meteoritical Bulletin Database

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