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BIFs are associated with the oxygenation of Earth's atmosphere, over vast periods of time, in Earth's distant past. They are also a vast storehouse of the element iron (mainly in the form of the minerals hematite and magnetite), and are mined for such.
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What do Proterozoic-aged red beds and banded iron formations tell us about the Earth's early atmosphere?
Banded iron formations indicate that there were oxygen-rich and oxygen-poor episodes during Earth's early atmosphere. Banded iron formations first appear in the Archean, 3 billion years ago. Unbanded iron deposits (red beds) from the Proterozoic, 1.8 billion years ago, indicate that the atmosphere became oxygen rich and that oxygen-poor episodes were no longer prevalent.
Why did banded iron formations stop forming and how did this effect the build up of both oceanic and atmospheric oxygen?
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Scientists can determine if oxygen existed in earths Archean atmosphere by?
The Archean atmosphere is believed to have been free of free oxygen. Banded iron formations did not occur till near the end of the Archean period.
Is iron a rock?
Yes. A rock called 'banded iron' is the main ore of iron.
What are three non silicate minerals that are commonly found in rocks?
Relatively common nonsilicate groups include; Carbonates - such as chalk & limestone or as the matrix/cement in certain sandstones. Halides - potassium, chlorides and sodium minerals forming potashes, salts and evaporation deposits. Oxides - such as banded iron formations.
Banded iron formations were caused by the production of which atmospheric gas?
Oxygen
What do Proterozoic aged red beds and banded iron formations tell us about the Earth's early atmosphere?
Banded iron formations indicate that there were oxygen-rich and oxygen-poor episodes during Earth's early atmosphere. Banded iron formations first appear in the Archean, 3 billion years ago. Unbanded iron deposits (red beds) from the Proterozoic, 1.8 billion years ago, indicate that the atmosphere became oxygen rich and that oxygen-poor episodes were no longer prevalent.
What do Proterozoic-aged red beds and banded iron formations tell us about the Earth's early atmosphere?
Banded iron formations indicate that there were oxygen-rich and oxygen-poor episodes during Earth's early atmosphere. Banded iron formations first appear in the Archean, 3 billion years ago. Unbanded iron deposits (red beds) from the Proterozoic, 1.8 billion years ago, indicate that the atmosphere became oxygen rich and that oxygen-poor episodes were no longer prevalent.
Why did banded iron formations stop forming and how did this effect the build up of both oceanic and atmospheric oxygen?
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HOW OLD IS Banded iron formations?
Banded iron formations (BIFs) are cherts (a form of quartz - SiO2) that exhibit an alteration of rust-red and gray bands. The rust-red bands represent oxygen-rich episodes and are colored by ferric iron oxide (Fe2O3) and the gray bands represent oxygen-poor episodes in Earth's early atmosphere. The first appearance of BIFs was in the Archean, 3 billion years ago. Unbanded iron deposits first appear in the Proterozoic, 1.8 billion years ago. Banded iron formations are the largest source for mined iron. ----------------------------------------------------------------------------------------------------------- Banded Iron Formations are sedimentary rocks deposited in Earth's early oceans. Originally Earth had no Oxygen in its atmosphere or oceans and the oceans were full of Iron salts. As life began to establish on Earth it started in the Oceans and as a waste product it produced Oxygen (from photosynthesis). This oxygen reacted immediately with the Iron salts dissolved in the water and Iron Oxide precipitated out to form the banded Iron formations. This went on for billions of years until all the Iron was gone and the Oxygen began to be released into the atmosphere.
What has the author J E Maynard written?
J. E. Maynard has written: 'The origin of the precambrian banded iron formations'
How old is iron ore?
Most of the world's important iron ore resources occur in iron-rich sedimentary rocks known as banded iron formations (BIFs) which are almost exclusively of Precambrian age (i.e. greater than 600 million years old). Some iron ore deposits were formed more recently.
Scientists can determine if oxygen existed in earths Archean atmosphere by?
The Archean atmosphere is believed to have been free of free oxygen. Banded iron formations did not occur till near the end of the Archean period.
How old is Ore.?
Most of the world's important iron ore resources occur in iron-rich sedimentary rocks known as banded iron formations (BIFs) which are almost exclusively of Precambrian age (i.e. greater than 600 million years old). Some iron ore deposits were formed more recently.
Is iron a rock?
Yes. A rock called 'banded iron' is the main ore of iron.
What does bif stand for?
Banded iron formation
What is the composition of dripstone formations?
iron oxide
