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Topic: Rubidium Strontium dating

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	Radiometric dating - Wikipedia, the free encyclopedia
		Radiometric dating is a technique used to date materials based on a knowledge of the decay rates of naturally occurring isotopes, and the current abundances.
		Another relatively short-range dating technique is based on the decay of uranium-238 into thorium-230, a process with a half-life of 80,000 years It is accompanied by a sister process, in which uranium-235 decays into protactinium-231, which has a half-life of 34,300 years.
		Finally, fission track dating involves inspection of a polished slice of a material to determine the density of "track" markings left in it by the spontaneous fission of uranium-238 impurities.
	en.wikipedia.org /wiki/Radiometric_dating (2179 words)

	Rubidium-Strontium dating (Site not responding. Last check: 2007-09-07)
		The Rubidum-strontium dating method is a radiometric dating technique that geologists use to determine the age of rocks.
		The Rb-Sr dating method has been used extensively in dating rocks.
		The dates indicate the true age of the minerals only if the rocks have not been subsequently altered.
	www.sciencedaily.com /encyclopedia/rubidium_strontium_dating (357 words)

	Radioactive Dating
		Because the radioactive half-life of a given radioisotope is not affected by temperature, physical or chemical state, or any other influence of the environment outside the nucleus save direct particle interactions with the nucleus, then radioactive samples continue to decay at a predictable rate.
		For geologic dating, where the time span is on the order of the age of the earth and the methods use the clocks in the rocks, there are two main uncertainties in the dating process:
		For geologic dating, the age calculation must take into account the presence of the radioactive species at the beginning of the time interval.
	hyperphysics.phy-astr.gsu.edu /hbase/nuclear/raddat2.html (529 words)

	Radioisotope Dating Methods that date the rock, not the fossil itself.
		Since the radioisotope dating techniques, discussed on this web page, do not date the fossil but the rock surrounding the fossil; We need to look at a different set of assumptions than is necessary when considering either C-14 or Amino Acid dates.
		Evolutionists believe that the fossil will date the same as the surrounding rock because the radioisotope clock is generally thought to reset to zero.
		Radioisotope dating methods that date the rock, and not the fossil itself produce much longer ages than the radioisotope dating methods that only date the fossil itself.
	www.creation-science-prophecy.com /dating.htm (533 words)

	Dating minerals (from dating) -- Encyclopædia Britannica
		Potassium-bearing minerals including several varieties of mica, are ideal for rubidium–strontium dating as they have abundant parent rubidium and a low abundance of initial strontium.
		To date past events, processes, formations, and fossil organisms, geologists employ a variety of techniques.
		The dating of the Chu graves of Changsha
	www.britannica.com /eb/article-69772?tocId=69772 (863 words)

	CHAPTER 7 - DATING METHODS Part 1
		A somewhat different type of radioactive dating method is called "carbon 14 dating" or "radiocarbon dating." It is based on the formation of radioactive elements of carbon in the atmosphere by cosmic radiation and their subsequent decay to the stable carbon isotope.
		Uranium and thorium are only rarely found in fossil-bearing rocks, so recent attention has been given to rubidium dating and two types of potassium dating, all of which are radioactive isotopes of alkali metals, and are found in fossil rocks.
		Here is the meaning of the big words used in that quotation: Geochronology refers to rock dating; stratigraphy is the study of rock strata; paleontology, the study of fossils; petrography, the study of ancient pictures and markings; and parageny, the study of fossils as they might relate to one another.
	www.godrules.net /evolutioncruncher/1evlch07a.htm (9566 words)

	- Radiometric Dating Game -
		It had been noted that some minerals which yield such dates (as beryl, cordierite, etc.) can be claimed to have trapped excess argon in their channel structures or to have fractioned the Ar isotopes, but none of this can apply to the simple mica-like structures of chlorite.
		It’s not surprising that K-Ar dates often agree with the assumed dates of their geological periods, since the dates of the geological periods were largely inferred from K-Ar dating.
		Radiometric dating is predicated on the assumption that throughout the earth’s history radioactive decay rates of the various elements have remained constant.
	www.trueorigin.org /dating.asp (20902 words)

	rubidium-strontium dating -- Britannica Concise Encyclopedia - The online encyclopedia you can trust!
		The method is applicable to very old rocks because the transformation is extremely slow: the half-life, or time required for half the initial quantity of rubidium-87 to disappear, is approximately 48.8 billion years.
		Rubidium-87 comprises 27.85 percent of the total atomic abundance of rubidium, and of the four isotopes of strontium, only...
		Rubidium is a relatively abundant trace element in the Earth's crust and can be found in many common rock-forming minerals in which it substitutes for the major element potassium.
	www.britannica.com /ebc/article-9377275 (900 words)

	Rubidium-Strontium Dating (Site not responding. Last check: 2007-09-07)
		In this exercise, we will use the spreadsheet Excel to help with the calculation of radioactive age determinations for several cosmic materials of astronomical interest.
		Planetary and earth scientists use a number of methods to date rocks and soil samples.
		At this point, all ions are locked up in the individual crystals by amounts that depend on their charge and ion size.
	www.astro.lsa.umich.edu /users/cowley/RbSr (1225 words)

	Unreliability of Radiometric Dating and Old Age of the Earth
		Radiometric dating methods estimate the age of rocks using calculations based on the decay rates of radioactive elements such as uranium, strontium, and potassium.
		However, it would be better to date all five craters by all four different methods, and see what the agreement is. It is also possible that each crater gives a scatter of dates, and the best ones were selected.
		The uncertainties inherent in radiometric dating are disturbing to geologists and evolutionists...
	www.bible.ca /tracks/dating-radiometric.htm (20799 words)

	Evolutionary dating flaws (Site not responding. Last check: 2007-09-07)
		Here is a growing list of problems with dating techniques used in evolution and their problems.
		some are dated, the problems have not gone away.
		The lunar rocks and Skull 1470 are great examples of how dating methods do not agree.
	members.aol.com /acoxon1274/dating_flaws.html (736 words)

	Introduction to Radiometric Dating Techniques
		Since Radiometric Dating Techniques are based on the half-life phenomena of radioactive nuclides, lets explore it a little.
		Scientist use them to date the rock surrounding fossils because they seem to work well, producing numbers that they expect (more on this topic later).
		On the other hand, the rubidium strontium determination is used for rocks that seem to be very old, like the basement rocks of Earth, Moon rocks and meteorites.
	www.creation-science-prophecy.com /intro-dating.htm (1055 words)

	Radioactive Dating (Site not responding. Last check: 2007-09-07)
		might be the mineral K-spar, where rubidium can substitute for potassium because of its similar ion size.
		All rocks are capable of acommodating some amount of rubidium, even when there isn't an obvious substitution.
		In the case of the lunar rocks these initial ratios were taken from old meteorites.
	www.astro.lsa.umich.edu /users/cowley/rbsr.html (270 words)

	The Radiometric Dating Game
		But I believe that their message is true, namely, God created the universe, the earth, and all that is in it, God created life on earth recently, and the earth since then has experienced a major catastrophe.
		If in a few instances creationist discussion of anomalies in radiometric dating is based on a misunderstanding of the literature, there are plenty of other acknowledged anomalies that they could have used just as well.
		But I am thankful for the many voices being raised against this triumvirate of confusion, and believe that in the minds of many it is losing credibility, despite the resistance of establishment science.
	www.cs.unc.edu /~plaisted/ce/dating.html (22012 words)

	Rubidium-strontium dating -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-09-07)
		The rubidum-strontium dating method is a (Click link for more info and facts about radiometric dating) radiometric dating technique that (A specialist in geology) geologists use to determine the age of rocks.
		Sr) as a consequence of different ages, original Rb/Sr values and the initial
		Development of this process was aided by Fritz Strassmann, who later moved onto discovering Nuclear Fission with Otto Hahn and Lise Meitner.
	www.absoluteastronomy.com /encyclopedia/r/ru/rubidium-strontium_dating.htm (308 words)

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	Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations
		Energy Citations Database (ECD) Document #5192191 - Rubidium-strontium dating of clayey sediments
		Availability information may be found in the Availability, Publisher, Research Organization, Resource Relation and/or Author (affiliation information) fields and/or via the "Full-text Availability" link.
		Krasnobaev, A.A. Ronkin, Yu.L. Lepikhina, O.P. Publication Date
	www.osti.gov /energycitations/product.biblio.jsp?osti_id=5192191 (116 words)

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