In this Mineralogy lesson, we depart from the main lesson book by Live Education to focus on two lessons where we dive into how iron ore deposits formed in precambrian oceans. We previously did a lesson showing how iron ore is found in granite outcrops, but I wanted to add this lesson because as I researched Iron ore deposits and veins, I found that they are found frequently in sedimentary rocks as well as metamorphic rock and through hydrothermal activity. For this lesson, I illustrated a precambrian ocean which is not accurate by any means. I searched for illustrations online but did not qualify a time period. I chose elements from several illustrations to show plant and animal life in the ocean. In order for iron oxide to form, oxygen needed to be present in the ocean to bind to the dissolved iron. The ferrous ions were oxidized and precipitated out, settling on the ocean floor where they became cemented together over millions of years. Then through tectonic activity and changes in climate, the sedimentary rock lifted and became exposed to the elements. Through rain and wind as well as plant and animal activity, the rock eroded away to expose the iron ore veins.
You can find the complete list of materials we used for this unit, including pictures, links and descriptions of each book or kit, videos, resources and more at the blog post that accompanies this video:
www.pepperandpine.com/mineral...
Check out the Mineralogy, Earth Science and Geology playlist for projects, resources and more!
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28 май 2024
