Clastic Sedimentary Rocks Can Be Directly Dated Using Isotopic Dating
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8 .4 Isotopic Dating Methods - Physical Geology
8 .4 Isotopic Dating Methods - Physical Geology - 2nd Edition
geology chapter 10 Flashcards | Quizlet
Geologists cannot date a clastic sedimentary rock | Chegg .com
19 .4 Isotopic Dating Methods - Physical Geology, First . . .
Sedimentary Rocks - Creation
Why is it difficult to date sedimentary rocks using . . .
Radiometric dating of sedimentary rocks: the application . . .
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In most cases, we cannot use isotopic techniques to directly date fossils or the sedimentary rocks they are found in, but we can constrain their ages by dating igneous rocks that cut across sedimentary rocks , or volcanic ash layers that lie within sedimentary layers . Isotopic dating of rocks , or the minerals in them, is based on the fact that we know the decay rates of certain unstable isotopes of elements and that these rates have been constant over geological time . It is also based on the . . .
In most cases, we cannot use isotopic techniques to directly date fossils or the sedimentary rocks they are found in, but we can constrain their ages by dating igneous rocks that cut across sedimentary rocks , or volcanic layers that lie within sedimentary layers . Figure 8 .4 .1 The decay of 40 K over time .
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Geologists cannot date a clastic sedimentary rock directly using isotopic geochronologic methods . Why not? The dates would indicate the times the minerals and rocks formed in igneous or metamorphic rocks rather than depositional age; Question: Geologists cannot date a clastic sedimentary rock directly using isotopic geochronologic methods . Why not?
In most cases, we cannot use isotopic techniques to directly date fossils or the sedimentary rocks in which they are found, but we can constrain their ages by dating igneous rocks that cut across sedimentary rocks , or volcanic ash layers that lie within sedimentary layers . Isotopic dating of rocks , or the minerals within them, is based upon the fact that we know the decay rates of certain unstable isotopes of elements, and that these decay rates have been constant throughout geological time . . .
ANSWER: Sedimentary rocks cannot be dated directly using radiometric dating , which is based on the idea that when rocks are in liquid form, their radiometric clock resets . This technique is generally used to date igneous and metamorphic rock , which are rocks that were once melted due to extreme heat and pressure .
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 . 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 . However, sedimentary rocks can be age dated if a volcanic ash horizon or a diabase sill or dyke can be found within the sequence .
Although some Precambrian sedimentary rocks have been dated using glauconite Gulbrandsen et al ., 1963, Tugarinov et al ., 1965, Goode and Hall, 1981, Clauer, 1981, its application to dating older strata is hampered by the greater likelihood of isotopic disturbance during weathering, diagenesis or metamorphism . As the estimated closure temperatures for glauconite are relatively low (ca . 200 °C for K-Ar and ca . 230 °C for Rb-Sr; Odin et al ., 1982), the possibility of thermal resetting is . . .
Ý At best, clastic minerals can only provide the age(s) of their parent source rocks . Isotopic Dating of Sedimentary Rocks ? Isotopic dating of a sedimentary rock is only possible if it contains an authigenic mineral or material (e .g . glauconite, K-feldspar, organic matter) that crystallized in the sedimentary environment of deposition . Ý Bracketing the Ages of Sedimentary Rocks
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8) Which types of rocks can be dated using radiometric techniques? Why can't accurate age determinations be obtained from clastic (detrital) sedimentary rocks (like conglomerates)? Explain . Because the radiometric isotopes are not reset when the clastic sedimentary rocks are formed . They form at too low of temperatures and pressures .
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Clastic Sedimentary Rocks Can Be Directly Dated Using Isotopic Dating
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