High School Earth Science/Absolute Ages of Rocks

Leibnitz reworked Descartes’s cosmogony. Protogea was published much later in An essay toward a Natural History of the Earth. Woodward came down fairly strongly for the view that the flood was an act of God that could not be accounted for by normal physical processes. He also postulated hydrological sorting to account for the ordering of fossils. Whiston added comets to Burnet’s cosmogony as the source of the waters of the flood. Lectures and Discourse of Earthquakes and Subterranean Eruptions.


Roman poet Lucretius, intellectual heir to the Greek atomists, believed its formation must have been relatively recent, given that there were no records going back beyond the Trojan War. The Talmudic rabbis, Martin Luther and others used the biblical account to extrapolate back from known history and came up with rather similar estimates for when the earth came into being.

Within decades observation began overtaking such thinking. In the s Nicolas Steno formulated our modern concepts of deposition of horizontal strata. He inferred that where the layers are not horizontal, they must have been tilted since their deposition and noted that different strata contain different kinds of fossil.

Radiometric dating. Geologists use radiometric dating to estimate how long ago rocks formed, and to infer the ages of fossils contained within those rocks.

The only dating methods discussed over and over by evolution-believing scientists and the mass media are those that supposedly “prove” that the earth is billions of years old. One of the most popular of these is known as radiometric dating. However, not as well known is the fact that such methods have serious flaws which are often glossed over, or ignored when writing on, or discussing this subject in public. Another pertinent thing that’s also ignored, minimized, or scoffed at are the numerous other scientific methods of dating the earth, solar system, and or universe that yield much younger ages than million years max.

With the exception of Carbon , radiometric dating is used to date either igneous or metamorphic rocks that contain radioactive elements such as uranium. And even though various radioactive elements have been used to “date” these rocks, for the most part, the methods are basically the same. They consist of measuring the amount of radioactive mother element and comparing it to the amount of stable daughter element.

Uranium is radioactive, which means it is in the process of changing from an unstable element into a stable one. The most common form is uranium It has a half-life of about 4. This means that if you had some pure uranium with no lead in it, 4. Few people realize it but all radiometric dating methods require making at least three assumptions.

The Age of the Earth

Making Sense of the Patterns This three-part series will help you properly understand radiometric dating, the assumptions that lead to inaccurate dates, and the clues about what really happened in the past. Most people think that radioactive dating has proven the earth is billions of years old. Yet this view is based on a misunderstanding of how radiometric dating works.

Part 1 in the previous issue explained how scientists observe unstable atoms changing into stable atoms in the present.

Before the development of isotopic dating methods, the age of the Earth was estimated by. Identify the FALSE statement. Radiometric dating. Can be used only if there’s some uranium present in the rock – many different radioactive isotopes of many different minerals can be used GEO CH 50 terms. gyl test 2 ch OTHER SETS BY.

Reference to a case where the given method did not work This is perhaps the most common objection of all. Creationists point to instances where a given method produced a result that is clearly wrong, and then argue that therefore all such dates may be ignored. Such an argument fails on two counts: First, an instance where a method fails to work does not imply that it does not ever work. The question is not whether there are “undatable” objects, but rather whether or not all objects cannot be dated by a given method.

The fact that one wristwatch has failed to keep time properly cannot be used as a justification for discarding all watches. How many creationists would see the same time on five different clocks and then feel free to ignore it? Yet, when five radiometric dating methods agree on the age of one of the Earth’s oldest rock formations Dalrymple , p.

What are the Methods Used for Knowing the Age of the Earth

European Southern Observatory Here are fourteen natural phenomena which conflict with the evolutionary idea that the universe is billions of years old. The numbers listed below in bold print usually in the millions of years are often maximum possible ages set by each process, not the actual ages. The numbers in italics are the ages required by evolutionary theory for each item.

The point is that the maximum possible ages are always much less than the required evolutionary ages, while the biblical age 6, years always fits comfortably within the maximum possible ages.

The Uranium Dating Method Page 3 Generation of Palaeocene Adakitic Andesites According to the article 17 this rock formation from North Eastern China was dated in by scientists from China and Japan. According to the essay the true age is: “Palaeocene (c. Ma) adakitic andesites from the.

This is what archaeologists use to determine the age of human-made artifacts. But carbon dating won’t work on dinosaur bones. The half-life of carbon is only 5, years, so carbon dating is only effective on samples that are less than 50, years old. Dinosaur bones, on the other hand, are millions of years old — some fossils are billions of years old. To determine the ages of these specimens, scientists need an isotope with a very long half-life.

Some of the isotopes used for this purpose are uranium , uranium and potassium , each of which has a half-life of more than a million years. Unfortunately, these elements don’t exist in dinosaur fossils themselves. Each of them typically exists in igneous rock, or rock made from cooled magma. Fossils, however, form in sedimentary rock — sediment quickly covers a dinosaur’s body, and the sediment and the bones gradually turn into rock.

But this sediment doesn’t typically include the necessary isotopes in measurable amounts. Fossils can’t form in the igneous rock that usually does contain the isotopes.

Evolution: Library: Radiometric Dating

It is the only naturally occurring fissile isotope and is found in small concentrations in soil, rock and water and is mined from uranium-bearing minerals such as uraninite. Here are some of the most common uses of uranium in the world today! Uses of Uranium Military Uses: The main application of uranium in the military sector is in projectiles. Depleted uranium is used to create high-density penetrators such as those projectiles used to piece heavily armored targets.

I understand there are a few radio-dating methods to determine the age of the earth, uranium-lead to name one (maybe not the best though). The ratio Pb + Pb to U allows you to find when the u.

Radiometric dating In , shortly after the discovery of radioactivity , the American chemist Bertram Boltwood suggested that lead is one of the disintegration products of uranium, in which case the older a uranium-bearing mineral the greater should be its proportional part of lead. Analyzing specimens whose relative geologic ages were known, Boltwood found that the ratio of lead to uranium did indeed increase with age.

After estimating the rate of this radioactive change, he calculated that the absolute ages of his specimens ranged from million to 2. Though his figures were too high by about 20 percent, their order of magnitude was enough to dispose of the short scale of geologic time proposed by Lord Kelvin. Versions of the modern mass spectrometer were invented in the early s and s, and during World War II the device was improved substantially to help in the development of the atomic bomb.

Soon after the war, Harold C. Wasserburg applied the mass spectrometer to the study of geochronology. This device separates the different isotopes of the same element and can measure the variations in these isotopic abundances to within one part in 10, By determining the amount of the parent and daughter isotopes present in a sample and by knowing their rate of radioactive decay each radioisotope has its own decay constant , the isotopic age of the sample can be calculated.

For dating minerals and rocks, investigators commonly use the following couplets of parent and daughter isotopes: The SHRIMP Sensitive High Resolution Ion Microprobe enables the accurate determination of the uranium-lead age of the mineral zircon, and this has revolutionized the understanding of the isotopic age of formation of zircon-bearing igneous granitic rocks.

Another technological development is the ICP-MS Inductively Coupled Plasma Mass Spectrometer , which is able to provide the isotopic age of the minerals zircon, titanite, rutile, and monazite.

Age of the Earth

Uranium glass glowing under UV light Before and, occasionally, after the discovery of radioactivity, uranium was primarily used in small amounts for yellow glass and pottery glazes, such as uranium glass and in Fiestaware. This waste product was diverted to the glazing industry, making uranium glazes very inexpensive and abundant. Besides the pottery glazes, uranium tile glazes accounted for the bulk of the use, including common bathroom and kitchen tiles which can be produced in green, yellow, mauve , black, blue, red and other colors.

Uranium glass used as lead-in seals in a vacuum capacitor Uranium was also used in photographic chemicals especially uranium nitrate as a toner , [9] in lamp filaments for stage lighting bulbs, [23] to improve the appearance of dentures , [24] and in the leather and wood industries for stains and dyes.

Absolute dating is the process of determining an age on a specified chronology in archaeology and geology. Some scientists prefer the terms chronometric or calendar dating, as use of the word “absolute” implies an unwarranted certainty of accuracy.

His calculations did not account for heat produced via radioactive decay a process then unknown to science or, more significantly, convection inside the Earth, which allows more heat to escape from the interior to warm rocks near the surface. For biologists, even million years seemed much too short to be plausible. In Darwin’s theory of evolution , the process of random heritable variation with cumulative selection requires great durations of time.

According to modern biology, the total evolutionary history from the beginning of life to today has taken place since 3. Huxley , attacked Thomson’s calculations, suggesting they appeared precise in themselves but were based on faulty assumptions. The physicist Hermann von Helmholtz in and astronomer Simon Newcomb in contributed their own calculations of 22 and 18 million years respectively to the debate: However, they assumed that the Sun was only glowing from the heat of its gravitational contraction.

The process of solar nuclear fusion was not yet known to science. In John Perry challenged Kelvin’s figure on the basis of his assumptions on conductivity, and Oliver Heaviside entered the dialogue, considering it “a vehicle to display the ability of his operator method to solve problems of astonishing complexity.

Dating Sedimentary Rock

November 29, NASA When asked for your age, it’s likely you won’t slip with the exception of a recent birthday mistake. But for the sprawling sphere we call home, age is a much trickier matter. Before so-called radiometric dating, Earth’s age was anybody’s guess.

No. Carbon dating is one form of radiometric dating, but it is only useful out to 50, years before present, give or take. (interesting note: “present”, for the purposes of carbon dating, is actually post , nuclear testing changed the.

John Rennie k So as long as whatever process formed the Earth also differentiated the parent and daughter isotopes that were present in the solar nebula not an unreasonable assumption , then there is no reason to expect that enough daughter isotopes in a radioactive sample would be older than the formation event to affect the measurement. Similarly for volcanic rocks, which lose daughter isotopes to the air during an eruption. But if it doesn’t contain any lead it must have formed very recently, maximum tens of millions of years ago.

And if the uranium is older there must be lead somewhere, not incorporated in the zircon. So you have an amount of uranium, of which you don’t know how many percent of the original it is. And without this ratio there’s no dating. One half life later there are equal numbers of uranium and lead atoms. Two half lives later the lead:

Age of the Earth

For example, back in , Lord Kelvin calculated how long Earth might have taken to cool from its original molten state. He concluded that Earth was born 20 to million years ago. Their message proved difficult to decipher. How old is Earth?

The thing is just not uranium dating, but dozens and dozens of other things. Yes one or two may be wrong, but you unless you have a specific reason to think so (i.e. young earth creationism is right no matter what), they can’t all be wrong.

For millennia, humans assumed that the Earth was about as old as we were. The “begats” in the Bible were another source for estimates: In the 17th century, Ireland’s Archbishop James Ussher reconstructed the genealogy of biblical figures and declared that Earth was created at 6 p. Scientists now know the Earth is actually 4.

The modern effort to understand the age of the planet started with Nicholas Steno , a Danish anatomist and geologist who was among the first to realize that fossils are the remains of living creatures. Where do old spacecraft go when they die? Not only was the Earth not young, but it was not static, Hutton said. Others looked at the average rate of sedimentation and concluded it would take anywhere from 3 million to 1.

Why do we love our pets? Here’s how that works:

Creation v. Evolution: How Carbon Dating Works