File:Impact breccia (Middle Ordovician; Hummeln Impact Structure, Sweden) 2.jpg

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English: Impact breccia from the Ordovician of Sweden.

This sample consists of impact-brecciated basement rocks from southern Sweden's Hummeln Impact Structure, a relatively small, eroded crater located in the southern part of Lake Hummeln. The clasts are Precambrian granite, a crystalline-textured, intrusive igneous rock having quartz and potassium feldspar. The impact occurred during the Middle Ordovician at a time in Earth history when impact events were relatively frequent. The L-chondrite parent body in the Asteroid Belt (between Mars and Jupiter) was disrupted during the Ordovician - this event resulted in an increased flux of asteroid and meteoroid impacts on Earth. Fragments of the busted-up L chondrite parent body are now represented by the Flora family of stony asteroids.

Locality: unrecorded/undisclosed site at or near the Hummeln Impact Structure, Lake Hummeln area, Småland Province, southern Sweden

See info. at: en.wikipedia.org/wiki/Hummeln_structure and Alwmark et al. (2015) - Impact origin for the Hummeln structure (Sweden) and its link to the Ordovician disruption of the L chondrite parent body. Geology 43: 279-282. and

en.wikipedia.org/wiki/Ordovician_meteor_event
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Source https://www.flickr.com/photos/47445767@N05/50903893962/
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/50903893962. It was reviewed on 3 February 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

3 February 2021

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current16:59, 3 February 2021Thumbnail for version as of 16:59, 3 February 20213,615 × 2,677 (8.23 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50903893962/ with UploadWizard

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