ll T-Mobile LTE 11:48 AM Graded Activities-Sediment... Let\'s now move on to an

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ll T-Mobile LTE 11:48 AM Graded Activities-Sediment... Let's now move on to an application! One of the ways sedimentary geologists can quantitatively describe the grain size distribution of a sediment sample is by "sieving. Sieves are used to divide the sediment sample into classes of similar sizes. - Al the front of the room there is a stack of sieves. Each sieve has a different mesh size that will only allow grains smaller than it to pass through. The meshes range from 1400 micrometers on the uppermost sieve to (1.4mm) to a catch pan at the bottom for particles smaler than all the First, take a small portion of either sample alpha orbeta and weigh it. Record this bulk weight here: grams. (remember to tare the cup first) Pour that sample into the stack of sieves and shake the column gently for about 2 minutes. - - You will then remove each sieve pan, turn it over onto a piece of paper, brush the sieve to knock off any lodged grains, tare the cup, dump the sediment from the paper into the cup, and weigh that sample. Repeat for each pan and record your results here: Size Class Grain Diameter (d) Weight Weight Percent 1400 ? 1400 im > d z 600 ?m 600 um > d 2 425 um 425 ?m > d 250 ?m 250 ?m > d 2 150 ?m 90,m > d Dashboard Calendar To Do Notifications Inbox

Explanation / Answer

The retention of unaltered feldspar in an arkose indicates that the climatic conditions were least favorable for weathering of the feldspar to take place, and the deposition took place rapidly in proximity to a source rock containing high amounts of K-feldspar. So, it can be said that the deposition of an arkose took place nearby a granitic terrain in a colder environment.

Sedimentary rock samples:

Rock

Type

Distinguishing properties

Conglomerate

Detrital

Rounded unsorted grains

Breccia:

Detrital,

Angular unsorted grains

Sandstone:

Detrital

Well-sorted, smaller grains of quartz, K-feldspar

Arkose:

Detrital

K-Feldspar abundance

Shale:

Detrital

Fine grained laminations of clay, silt

Rock Gypsum:

Chemical

Mono-mineralic, an abundance of soft, fibrous crystals of gypsum

Chert:

Chemical

Nodular form within other rocks

Dolostone:

Chemical

White-Pink crystals of dolomite producing mild dissolution in reaction with dilute acid

Micrite:

Chemical

Microcrystalline grains of calcite having muddy texture and dull luster.

Fossiliferous Limestone:

Chemical, Organic

Macroscopic fossil abundance with fine-grained calcite

Coquina:

Chemical. Organic

Sorted fragments of fossils

Bituminous coal:

Organic

Black, hard and lustrous

Rock

Type

Distinguishing properties

Conglomerate

Detrital

Rounded unsorted grains

Breccia:

Detrital,

Angular unsorted grains

Sandstone:

Detrital

Well-sorted, smaller grains of quartz, K-feldspar

Arkose:

Detrital

K-Feldspar abundance

Shale:

Detrital

Fine grained laminations of clay, silt

Rock Gypsum:

Chemical

Mono-mineralic, an abundance of soft, fibrous crystals of gypsum

Chert:

Chemical

Nodular form within other rocks

Dolostone:

Chemical

White-Pink crystals of dolomite producing mild dissolution in reaction with dilute acid

Micrite:

Chemical

Microcrystalline grains of calcite having muddy texture and dull luster.

Fossiliferous Limestone:

Chemical, Organic

Macroscopic fossil abundance with fine-grained calcite

Coquina:

Chemical. Organic

Sorted fragments of fossils

Bituminous coal:

Organic

Black, hard and lustrous

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