Kondjor massif

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Kondjor massif
Post-processed satellite image

Post-processed satellite image

height 1387  m
location Siberia
Mountains Aldan highlands
Coordinates 57 ° 35 ′ 0 ″  N , 134 ° 40 ′ 0 ″  E Coordinates: 57 ° 35 ′ 0 ″  N , 134 ° 40 ′ 0 ″  E
Kondjor massif (Khabarovsk region)
Kondjor massif

The Kondjor massif ( Russian Кондёр ) is an almost perfectly circular mountain range with a diameter of about 8 km and up to 1387  m in height in the eastern part of the Aldan highlands near the Pacific coast of Russia . It is located on the territory of the Khabarovsk region , but the closest major city is Yakutsk , capital of the Sakha Republic (Yakutia), about 570 km to the northwest .

Emergence

Contrary to original hypotheses, the Kondjor massif is neither a volcanic crater ( caldera ) nor an impact crater created by a meteorite impact , but an extrusion of deeper-lying material with deposits of rare ores that originally arose a few thousand meters below the earth's surface and in the course of became visible on the surface about a million years ago when it was exposed by erosion .

Geology and Mineral Finds

Platinum nugget from the Kondjor massif

It is one of the richest platinum deposits in Russia. In addition to other precious metals such as solid gold , silver , iridium and osmium , an extraordinary variety of sometimes rare minerals such as erlichmanite , hollingworthite , laurite , monticellite , tetra-auricupride and zvyagintsevite as well as the minerals known as gemstones spinel and titanite were found here.

A total of around 80 mineral species have been documented for the Kondjor massif so far (as of 2017). For the minerals Bortnikovit , Cuproiridsit , Ferhodsit , Ferrorhodsit and Konderit also the Kondyor Massif is considered type locality .

See also

literature

  • Alkaline Rocks and Carbonatites of the World. Part 2: L. Kogarko, V. Kononova, M. Orlova, AR Woolley: Former USSR. Chapman and Hall, London et al. 1995, ISBN 0-412-61410-3 .
  • Galina G. Shcheka, Bernd Lehmann, Eike Gierth, Karsten Gömann, Alex Wallianos: Macrocrystals of Pt-Fe alloy from the Kondyor PGE placer deposit, Khabarovskiy Kray, Russia: Trace-element content, mineral inclusions and reaction assemblages . In: The Canadian Mineralogist . tape 42 , no. 2 , 2004, ISSN  0008-4476 , p. 601–617 , doi : 10.2113 / gscanmin.42.2.601 ( tu-clausthal.de [PDF; 1,2 MB ; accessed on January 22, 2018]).

Web links

Commons : Kondjor-Massiv  - Collection of images, videos and audio files

Individual evidence

  1. homepage Kondyor Platinum Mine ( Memento of 10 October 2007 at the Internet Archive ).
  2. Mindat - type locality Konder alkaline-ultrabasic massif (Konder placers; Konder mine; Kondyor), Aldan shield, Ayan-Maya district, Khabarovskiy Kray, Far-Eastern Region, Russia (English, including list of minerals discovered there so far).