lilliehear
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I seriously can’t find a concise answer anywhere so any help would be much appreciated.

What's the difference between a matrix and cement on sedimentary rock, or are they the same? They seem to be used interchangeably


Thanks in advance
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schnapster
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(Original post by lilliehear)
I seriously can’t find a concise answer anywhere so any help would be much appreciated.

What's the difference between a matrix and cement on sedimentary rock, or are they the same? They seem to be used interchangeably


Thanks in advance
They are different, although in the textbook (OCR at least) they're used interchangeably. According to my geology dictionary matrix is 'the fine grained material separating clasts in sedimentary rock', whereas cement is 'mineral matter, introduced after deposition, that binds the sediment into rock'. Hope this helps

Edit: Oh just noticed, if you have the OCR Geology textbook they have definitions on page 115 of cement and matrix. They're pretty much the same as the ones I put above.
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lilliehear
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(Original post by schnapster)
They are different, although in the textbook (OCR at least) they're used interchangeably. According to my geology dictionary matrix is 'the fine grained material separating clasts in sedimentary rock', whereas cement is 'mineral matter, introduced after deposition, that binds the sediment into rock'. Hope this helps

Edit: Oh just noticed, if you have the OCR Geology textbook they have definitions on page 115 of cement and matrix. They're pretty much the same as the ones I put above.
Thank you, and yes i was using the OCR book so really should read it properly first
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Dave Bizy
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In addition to the above explanation, here are some differences noteworthy, matrix is the same age as the clasts they hold and cement comes later with pore water, matrix is heterogeneous whereas cement is homogeneous, matrix is chemically impure while cement is chemically pure, matrix drapes over grains while cement lines pores.
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