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Radiometric dating sedimentary rock

Posted on by Fauzshura Posted in Big Cock 2 Comments ⇩

Similarly, it may be possible to date crystals formed in cleavage caused by deformation, or to date the surrounding rock layers e. As the sedimentary rock had to have existed to be intruded, this can give us a minimum age for the rock. But, the decay elements need to be set, much like you would re-set a stop watch for a runner, to ensure an accurate measurement. Depending on their composition, the age of these grains can sometimes be determined using radiometric dating e. If the sedimentary rock is relatively young e. Because the elements used for dating need to be re-set by volcanism. However, the ages resulting from such analyses inform us about the cooling age of the crystal, so can only provide a maximum age for deposition of the sedimentary rock in which they are found. For example, if you find a dinosaur bone in a sedimentary sequence and you find an ash layer 10 meter above the bone and another ash layer 20 meters below it, you can determine the age of the two ash layers. A minimum age for the sedimentary rock can sometimes be determined by looking at what has happened to the sediment or rock after it was deposited or lithified. However, sedimentary rocks can be age dated if a volcanic ash horizon or a diabase sill or dyke can be found within the sequence. Sedimentary rocks may have radioactive elements in them, but they have been re-worked from other rocks, so essentially, there radiometric clock has not been re-set back to zero. When minerals get subducted into the Earth and come back as volcanic magmas or ash, this essential re-sets the radiometric clock back to zero and therefore a reliable age date is possible. If you get volcanic rocks within sedimentary succession, that can also be dated by the radiometric method such as U-Pb or Ar-Ar. Stephen James Rippington Added an answer This isn't a straightforward question and there is no simple answer. By formation, do you mean the timing of deposition, or the timing of lithification?

Radiometric dating sedimentary rock


Let the contributor know! If you get volcanic rocks within sedimentary succession, that can also be dated by the radiometric method such as U-Pb or Ar-Ar. But, the decay elements need to be set, much like you would re-set a stop watch for a runner, to ensure an accurate measurement. Depending on their composition, the age of these grains can sometimes be determined using radiometric dating e. U-Pb dating of zircons, or K-Ar dating of micas. By formation, do you mean the timing of deposition, or the timing of lithification? A minimum age for the sedimentary rock can sometimes be determined by looking at what has happened to the sediment or rock after it was deposited or lithified. For example, it may be possible to use radiometric dating to ascertain the age of an intrusion in to a sedimentary body. When minerals get subducted into the Earth and come back as volcanic magmas or ash, this essential re-sets the radiometric clock back to zero and therefore a reliable age date is possible. Because the elements used for dating need to be re-set by volcanism. Stephen James Rippington Added an answer This isn't a straightforward question and there is no simple answer. All these techniques provide ranges of time in which the rock could have been deposited. However, the ages resulting from such analyses inform us about the cooling age of the crystal, so can only provide a maximum age for deposition of the sedimentary rock in which they are found. You can then infer that the dino must have lived some time between these two age dates. However, sedimentary rocks can be age dated if a volcanic ash horizon or a diabase sill or dyke can be found within the sequence. Radioactive elements decay at a certain constant rate and this is the basis of radiometric dating. For example, if you find a dinosaur bone in a sedimentary sequence and you find an ash layer 10 meter above the bone and another ash layer 20 meters below it, you can determine the age of the two ash layers. If the sedimentary rock is relatively young e. Similarly, it may be possible to date crystals formed in cleavage caused by deformation, or to date the surrounding rock layers e. As the sedimentary rock had to have existed to be intruded, this can give us a minimum age for the rock. Sedimentary rocks may have radioactive elements in them, but they have been re-worked from other rocks, so essentially, there radiometric clock has not been re-set back to zero.

Radiometric dating sedimentary rock


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