User:MCarrier18/sandbox
Article evaluation
Magnetite
There appears to be an American bias for this article, but remains neutral for the most part
Most of the resources come from legitimate, with working links and was relevant to what was being stated, however one reference lead me to a blog post. No reference for the reactions section
Missing information on formation processes
No explanation as the importance of magnetite's use in solid solutions
The article is apart of 2 WikiProjects,one for geology and one for rocks and minerals, both being rated as a C
The talk mentions the missing citations blog reference, as well, there are posted questions concerning clarification on various sections of the article with additional references.
The topic has not been mentioned in class yet
Notes
Comments from Sarah If you're going to talk specifically about occurrences just make sure you're not overlapping with another page. For example, the banded iron formation page already exists https://en.wikipedia.org/wiki/Banded_iron_formation ... but as you can see it's very sparse, so you could add to that if you chose to focus on BIF. In terms of magmatic process, what you are describing is fractional crystallization and there is also a wikipedia page on that. What you could do is mention these and link the pages.
I am interested in determining the various processes in which magnetite forms
Magnetite contains both ferrous and ferric iron, requiring environments containing intermediate levels of oxygen availability to form.[1]
Draft
Magnetite contains both ferrous and ferric iron, requiring environments containing intermediate levels of available oxygen to form.[1]
Banded iron formations (also known as banded ironstone formations or BIFs) are distinctive units of sedimentary rock that are almost always of Precambrian age.
A typical banded iron formation consists of repeated, thin layers (a few millimeters to a few centimeters in thickness) of silver to black iron oxides, either magnetite (Fe3O4) or hematite (Fe2O3), alternating with bands of iron-poor shales and cherts, often red in color, of similar thickness, and containing microbands (sub-millimeter) of iron oxides.[2]
Some of the oldest known rock formations, formed over 3,700 million years ago, include banded iron layers.[3] Banded iron formations account for more than 60% of of global iron reserves, and can be found in Australia, Canada, India, Russia, South Africa, Ukraine, and the United States.[4][5]
Formation Process[edit]
BIFs occur in two forms, Algoma and Superior-type.[4] [5][6]
Algoma-type[edit]
Algoma-type are generally smaller in size and formed primarly in the Archean. Algoma-type BIFs are generally found in volcanic rocks in greenstone belts. The formation process involves the chemical precipitation of Iron in anoxic environments. When oxidized the iron would precipitate out and accumulate at the bottom of the seafloor, as the oxygen levels continuously shift, we can see deposits interlaced layers of iron and silicate form.[4][5][6]
Superior-type[edit]
Superior type are the second and larger form of BIFs. They primarily formed during the Paleoproterozoic era, occurring on continental shelves and can be found around the world.[4][5][6] Superior types were formed by chemical precipitation in shallow waters, primarly due to the low atmospheric and ocean oxygen levels, resulting in high iron levels in the oceans. Under calm shallow conditions, oxygen released during photosynthesis by blue-green algae, would combine with the iron creating magnetite, which would then sink and deposit on the floor.[7]
I have decided to switch my project to focus on the formation processes of banded iron formations on the BIF page. I plan on distinguishing between algoma and a superior type BIFs and their respective formation processes.
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- ^ a b E., Kesler, Stephen. Mineral resources, economics and the environment. Simon, Adam F., 1965- (Second edition ed.). Cambridge, United Kingdom. ISBN 9781107074910. OCLC 907621860.
{{cite book}}:|edition=has extra text (help)CS1 maint: multiple names: authors list (link) - ^ Katsuta, N.; Shimizu, I.; Helmstaedt, H.; Takano, M.; Kawakami, S.; Kumazawa, M. (1 June 2012). "Major element distribution in Archean banded iron formation (BIF): influence of metamorphic differentiation". Journal of Metamorphic Geology. 30 (5): 457–472. doi:10.1111/j.1525-1314.2012.00975.
- ^ Minik T. Rosing, et al., Earliest part of Earth's stratigraphic record: A reappraisal of the >3.7 Ga Isua (Greenland) supracrustal sequence, Geology, 1996, v. 24 no. 1 p. 43-46
- ^ a b c d Nadoll, Patrick; Angerer, Thomas; Mauk, Jeffrey L.; French, David; Walshe, John. "The chemistry of hydrothermal magnetite: A review". Ore Geology Reviews. 61: 1–32. doi:10.1016/j.oregeorev.2013.12.013.
- ^ a b c d Zhu, Xiao-Qing; Tang, Hao-Shu; Sun, Xiao-Hui. "Genesis of banded iron formations: A series of experimental simulations". Ore Geology Reviews. 63: 465–469. doi:10.1016/j.oregeorev.2014.03.009.
- ^ a b c Li, Li-Xing; Li, Hou-Min; Xu, Ying-Xia; Chen, Jing; Yao, Tong; Zhang, Long-Fei; Yang, Xiu-Qing; Liu, Ming-Jun. "Zircon growth and ages of migmatites in the Algoma-type BIF-hosted iron deposits in Qianxi Group from eastern Hebei Province, China: Timing of BIF deposition and anatexis". Journal of Asian Earth Sciences. 113: 1017–1034. doi:10.1016/j.jseaes.2015.02.007.
- ^ "banded iron formations facts, information, pictures | Encyclopedia.com articles about banded iron formations". www.encyclopedia.com. Retrieved 2018-02-22.