Earth:Greenstone Flow
From HandWiki
Short description: Lava flow in North America
The Greenstone Flow is one of the world's largest known lava flows, estimated at a volume of around 1,650 to 6,000 cubic kilometers (400 to 1,440 cu mi) of mafic lava.[2][3] In places, the lava pooled to depth of 487 meters (1,598 ft).[4] The flow was generated by a flood basalt eruption during the formation of the Midcontinental Rift, which occurred 1.1 billion years ago.[5] Where the solidified lava is exposed, it forms much of the Keweenaw Peninsula and Isle Royale in Lake Superior. At Isle Royale, the flow forms the backbone of the island and the Greenstone Ridge trail runs along its length.[1] The flow is the typical source for the semiprecious Isle Royale greenstone.[6]
References
- ↑ 1.0 1.1 "The Portage Lake Volcanics (Middle Keweenawan) on Isle Royale, Michigan". United States Geological Survey. https://www.nps.gov/parkhistory/online_books/geology/publications/pp/754-C/sec2.htm.
- ↑ "Large Lava Flows". https://geo.mtu.edu/KeweenawGeoheritage/BlackLavas/Large_Lava_Flows.html.
- ↑ Zhang, Yiming; Swanson‐Hysell, Nicholas L.; Schmitz, Mark D.; Miller, James D.; Avery, Margaret S. (September 13, 2021). "Synchronous Emplacement of the Anorthosite Xenolith‐Bearing Beaver River Diabase and One of the Largest Lava Flows on Earth" (in en). Geochemistry, Geophysics, Geosystems 22 (10). doi:10.1029/2021GC009909. ISSN 1525-2027. https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2021GC009909.
- ↑ "How to explore a billion-year-old volcanic mystery along Lake Superior" (in en). October 23, 2024. https://www.nationalgeographic.com/travel/article/volcanic-mystery-lake-superior-upper-midwest.
- ↑ "Lake Superior Geology" (in en). National Park Service. https://www.nps.gov/articles/000/lake-superior-geology.htm.
- ↑ "Exploring the Rich History of Michigan's Greenstone" (in en). Main Street Rocks. https://www.mainstreetrocks.com/s/stories/exploring-the-rich-history-of-michigans-greenstone.
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