Wikimedia Commons

File:Gabbroic anorthosite to anorthositic gabbro (anorthosite series, Duluth Complex, Mesoproterozoic, 1099 Ma; Merritt Creek West Skyline Parkway roadcut, Duluth, Minnesota, USA) 1.jpg

Original file ‎(3,357 × 2,658 pixels, file size: 3.33 MB, MIME type: image/jpeg)

Captions

Captions

Add a one-line explanation of what this file represents

Summary edit

Description
English: Gabbroic anorthosite to anorthositic gabbro in the Precambrian of Minnesota, USA.

This is part of the widespread Duluth Complex, a ~1.1 billion year old suite of igneous rocks in northeastern Minnesota that is associated with volcanism in the Lake Superior segment of the ancient Mid-Continent Rift System.

These grayish-colored rocks are gabbroic anorthosite to anorthositic gabbro, which are mafic, phaneritic (coarsely-crystalline), intrusive igneous rocks dominated calcium-rich plagioclase feldspar - CaAl2Si2O8 - calcium aluminosilicate. The light gray-colored crystals are the plagioclase - their composition (An70) is on the border between labradorite plagioclase and bytownite plagioclase. The dark-colored material between the plagioclase crystals is principally a mix of olivine and augite pyroxene.

Gabbroic anorthosite is slightly more plagioclase rich than anorthositic gabbro.

Geologic unit & age: anorthosite series, Duluth Complex, late Mesoproterozoic, 1099 Ma

Locality: Merritt Creek West outcrop - roadcut along the northern & northwestern side of Skyline Parkway, Duluth, northeastern Minnesota, USA (46° 45’ 41.23” North, 92° 09’ 38.58” West)
Date
Source https://www.flickr.com/photos/47445767@N05/22262061155/
Author James St. John

Licensing edit

w:en:Creative Commons
attribution
This file is licensed under the Creative Commons Attribution 2.0 Generic license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/22262061155. It was reviewed on 9 October 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

9 October 2020

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current05:57, 9 October 2020Thumbnail for version as of 05:57, 9 October 20203,357 × 2,658 (3.33 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/22262061155/ with UploadWizard

You cannot overwrite this file.

There are no pages that use this file.

Metadata

This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.

Retrieved from "https://commons.wikimedia.org/w/index.php?title=File:Gabbroic_anorthosite_to_anorthositic_gabbro_(anorthosite_series,_Duluth_Complex,_Mesoproterozoic,_1099_Ma;_Merritt_Creek_West_Skyline_Parkway_roadcut,_Duluth,_Minnesota,_USA)_1.jpg&oldid=684376986"