How Old is the Earth

These are K-Ar data obtained on glauconite, a potassium-bearing clay mineral that forms in some marine sediment. Woodmorappe fails to mention, however, that these data were obtained as part of a controlled experiment to test, on samples of known age, the applicability of the K-Ar method to glauconite and to illite, another clay mineral. He also neglects to mention that most of the 89 K-Ar ages reported in their study agree very well with the expected ages. Evernden and others 43 found that these clay minerals are extremely susceptible to argon loss when heated even slightly, such as occurs when sedimentary rocks are deeply buried. As a result, glauconite is used for dating only with extreme caution. The ages from the Coast Range batholith in Alaska Table 2 are referenced by Woodmorappe to a report by Lanphere and others Whereas Lanphere and his colleagues referred to these two K-Ar ages of and million years, the ages are actually from another report and were obtained from samples collected at two localities in Canada, not Alaska. There is nothing wrong with these ages; they are consistent with the known geologic relations and represent the crystallization ages of the Canadian samples. The Liberian example Table 2 is from a report by Dalrymple and others

“Polonium Haloes” Refuted

This age is obtained from radiometric dating and is assumed by evolutionists to provide a sufficiently long time-frame for Darwinian evolution. And OE Christians theistic evolutionists see no problem with this dating whilst still accepting biblical creation, see Radiometric Dating – A Christian Perspective. This is the crucial point:

It follows that uranium-lead, potassium-argon (K-Ar), and Rubidium-Strontium (Rb-Sr) decay can be used for very long time periods, whilst radiocarbon dating can only be used up to about 70, years.

Mineralogy As a discipline, mineralogy has had close historical ties with geology. Minerals as basic constituents of rocks and ore deposits are obviously an integral aspect of geology. The problems and techniques of mineralogy, however, are distinct in many respects from those of the rest of geology, with the result that mineralogy has grown to be a large, complex discipline in itself.

Nepheline greasy light gray , sodalite blue , cancrinite yellow , feldspar white , and ferromagnesian minerals black in an alkalic syenite from Litchfield, Maine, U. About 3, distinct mineral species are recognized, but relatively few are important in the kinds of rocks that are abundant in the outer part of the Earth. Thus a few minerals such as the feldspars, quartz, and mica are the essential ingredients in granite and its near relatives.

Limestones , which are widely distributed on all continents, consist largely of only two minerals, calcite and dolomite. Many rocks have a more complex mineralogy, and in some the mineral particles are so minute that they can be identified only through specialized techniques.

Radiometric dating

The half-life of a radioisotope can be used to measure the age of things. The method is called radiodating. Radiodating can be used to measure the age of rocks see below and carbon dating can be used to date archaeological specimens. Using Uranium to Date Rock. Some rocks contain uranium which is radioactive and follows a decay series until it produces a stable isotope of lead.

The various dating techniques available to archaeologists by Michael G. Lamoureux, March/April Introduction. Today’s archaeologist has a wide variety of natural, electro-magnetic, chemical, and radio-metric dating methodologies available to her that can be used to accurately date objects that are just a few hundred years old as well as objects that are a few million years old with high.

History[ edit ] All the elements and isotopes we encounter on Earth, with the exceptions of hydrogen, deuterium, helium, helium-3, and perhaps trace amounts of stable lithium and beryllium isotopes which were created in the Big Bang , were created by the s-process or the r-process in stars, and for those to be today a part of the Earth, must have been created not later than 4. All the elements created more than 4.

At the time when they were created, those that were unstable began decaying immediately. There are only two other methods to create isotopes: Unstable isotopes decay to their daughter products which may sometimes be even more unstable at a given rate; eventually, often after a series of decays, a stable isotope is reached: Stable isotopes have ratios of neutrons to protons in their nucleus which are typical about 1 for light elements e. The elements heavier than that have to shed weight to achieve stability, most usually as alpha decay.

There are many relatively short beta decay chains, at least two a heavy, beta decay and a light, positron decay for every discrete weight up to around and some beyond, but for the higher weight elements isotopes heavier than lead there are only four pathways which encompass all decay chains. This is because there are just two main decay methods: There are other decay modes, but they invariably occur at a lower probability than alpha or beta decay.

It should not be supposed that these chains have no branches: Three of those chains have a long-lived isotope or nuclide near the top; this long-lived isotope is a bottleneck in the process through which the chain flows very slowly, and keeps the chain below them “alive” with flow. The fourth chain has no such long lasting bottleneck isotope, so almost all of the isotopes in that chain have long since decayed down to very near the stability at the bottom. Near the end of that chain is bismuth , which was long thought to be stable.

Decay chain

Carbon , Radiometric Dating and Index Fossils Carbon dating is used to determine the age of biological artifacts up to 50, years old. This technique is widely used on recent artifacts, but educators and students alike should note that this technique will not work on older fossils like those of the dinosaurs alleged to be millions of years old. This technique is not restricted to bones; it can also be used on cloth, wood and plant fibers.

As explained on pages –, other heat sources are generating heat within the earth, so these thicknesses of granite would be even granite crust is generally estimated to be at least 50 km (30 miles) thick. Therefore, steady state has not been reached.

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. Hooke believed that the fossils were the remains of extinct species and could not be accounted for by the Flood. Using Descartes’s cosmology, the assumption that the earth was once entirely flooded, and the observation that the sea level was dropping three inches per century near his home, he calculated the age of the earth to be greater than 2 billion years.

Observation sur la Formation des Montagnards

Radioactive Dating Game

At the time that Darwin’s On the Origin of Species was published, the earth was “scientifically” determined to be million years old. By , it was found to be 1. In , science firmly established that the earth was 3. Finally in , it was discovered that the earth is “really” 4.

Carbon dating is used to determine the age of biological artifacts up to 50, years old. This technique is widely used on recent artifacts, but educators and students alike should note that this technique will not work on older fossils (like those of the dinosaurs alleged to be millions of years old).

Radioactive decay[ edit ] Example of a radioactive decay chain from lead Pb to lead Pb. The final decay product, lead Pb , is stable and can no longer undergo spontaneous radioactive decay. All ordinary matter is made up of combinations of chemical elements , each with its own atomic number , indicating the number of protons in the atomic nucleus. Additionally, elements may exist in different isotopes , with each isotope of an element differing in the number of neutrons in the nucleus.

A particular isotope of a particular element is called a nuclide. Some nuclides are inherently unstable.

Changing Views of the History of the Earth

Gentry by [Last Updated: It can be an especially difficult challenge when the Creationist author has professional credentials and has published in mainstream scientific journals. One such individual is Robert Gentry, who holds a Master’s degree in Physics and an honorary doctorate from the fundamentalist Columbia Union College. For over thirteen years he held a research associate’s position at the Oak Ridge National Laboratory where he was part of a team which investigated ways to immobilize nuclear waste.

"Every Rock Has A Story” Rocks are composed of chemical compounds naturally occurring in nature. Rocks are composed of particles ranging from microscopic grains to full sized crystals and crystal grains of different kinds of minerals, and containing many different identifiable physical characteristics. It is conceptually important that each rock has an origin in concepts of place, time, and.

See Article History Rock, in geology , naturally occurring and coherent aggregate of one or more minerals. Such aggregates constitute the basic unit of which the solid Earth is comprised and typically form recognizable and mappable volumes. Rocks are commonly divided into three major classes according to the processes that resulted in their formation. These classes are 1 igneous rocks, which have solidified from molten material called magma; 2 sedimentary rocks, those consisting of fragments derived from preexisting rocks or of materials precipitated from solutions; and 3 metamorphic rocks, which have been derived from either igneous or sedimentary rocks under conditions that caused changes in mineralogical composition , texture, and internal structure.

These three classes, in turn, are subdivided into numerous groups and types on the basis of various factors, the most important of which are chemical, mineralogical, and textural attributes. Rocks can be any size. Some are smaller than these grains of sand. Others, like this large rock that was dropped as a glacier melted, are as large as, or larger than, small cars. Since their constituent minerals are crystallized from molten material, igneous rocks are formed at high temperatures.

They originate from processes deep within the Earth—typically at depths of about 50 to kilometres 30 to miles —in the mid- to lower-crust or in the upper mantle. Igneous rocks are subdivided into two categories: OverviewThe Earth’s surface and crust are constantly evolving through a process called the rock cycle. Most are deposited from the land surface to the bottoms of lakes, rivers, and oceans.

Uranium–lead dating

In addition to its uses in nuclear technology, uranium has been used as a colorant in uranium glass, producing orange-red through lemon yellow hues. It was also used for tinting in early photography. Occurrence Biotic and abiotic Uraninite , also known as Pichblende, is the most common ore mined to extract uranium.

Uranium is a naturally occurring element that can be found in low levels within all rock, soil, and water.

Geology: Geology, the fields of study concerned with the solid Earth. Included are sciences such as mineralogy, geodesy, and stratigraphy. An introduction to the geochemical and geophysical sciences logically begins with mineralogy, because Earth’s rocks are composed of .

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, [2[23]o improve the appearance of dentures , [2[24]nd in the leather and wood industries for stains and dyes. Uranium salts are mordants of silk or wool.

Uranyl acetate and uranyl formate are used as electron-dense “stains” in transmission electron microscopy , to increase the contrast of biological specimens in ultrathin sections and in negative staining of viruses , isolated cell organelles and macromolecules. The discovery of the radioactivity of uranium ushered in additional scientific and practical uses of the element. The long half-life of the isotope uranium 4.