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Basalt dating methods
The paper methoes -- the Impact article -- locals that Will knew he'd get a relationship age from whole-rock Basalt dating methods of those lava flows, fall before the ICR let a single rock matchmaking of their own. They would sight for a much free absolute timescale than enough geologists would up, but the cute sequence is agreed upon by all lovers. That is, they come that excess day will task rocks and minerals that are before less than 10, costs old to have 'more' old K-Ar dates of resources or billions of resources. These had and reserve layers are Precambrian in age hookup in Figure 1, above. The often meaning is used to the dates.
One particular Precambrian layer known as datingg Cardenas Basalt has been dated by radiometric methods to about 1. The Cenozoic Basat sampled by ICR thus are claimed to yield an age which is about million years older than the Cardenas Basalt. But the Cardenas Basalt cannot be younger than the plateau flows, metbods to the geological relationships discussed in the first section of this document. Metuods says that his methode age is the result of a " research project "methdos. Austin suggests that the slope of his Bzsalt line indicating great age is " unexpected "p.
Mrthods other words, Austin claims that he methdos produced meethods seemingly reliable isochron age which must necessarily be wrong, and therefore the Rb-Sr isochron dating method, which is considered to be among the more reliable of radiometric dating methods, Basalt dating methods be considered suspect. Background on ICR's claims and isochrons The damaging Basalg trail In order to understand what is going on, Basalt dating methods is useful to examine the paper trail. He used data taken out of a mainstream scientist's paper Leeman to construct the Basakt. Leeman's datinng contains quite a bit more data than Austin used, with sufficient scatter to suggest that the resulting isochron probably is either an "inherited" reflection of the mantle source age or has no significance at all.
However, Austin narrowed down the data set to flows which fell into a particular stratigraphic range -- " stages III and IV of Hamblin's later classification ," said Austin -- and those selected data points fell quite close to a single line. In his paper, Austin noted that this sort of "false isochron" is well known, and explained in the mainstream literature. He cited a discussion of it in Faurepp. Isochron dating methods For general information on isochron dating methods, see talk. Further information is available in Dalrymplepp. The requirements of isochron dating One of the requirements for an isochron to signify the age of an object, is that the data points be derived from samples of materials which were isotopically homogeneous with respect to each other when the object formed, and all separated and ceased chemical exchange at the object's time of formation.
Moreover, we may assume that the time required for crystallization of the magma was relatively short and that all rocks produced by this process have very nearly the same age. Under these conditions, Equation 8. The molten state allows isotopic homogenization, the solidification ceases that process, and therefore the expected result is the time since the solidification occurred. It is possible for the data points to fall on an isochron line if this requirement is violated. The result will still have the same meaning: However, that result does not have to be the time since each sample formed.
Often it will be the isotopic age of the common source of the samples. That result could also be the age of the samples themselves, but only in the case where their common source was isotopically homogeneous -- i. For example, as discussed in the talk. It does not imply that the young Earth sediments themselves are 4. This is a well-known and expected behavior of isochrons. No competent geologist would be fooled by this sort of "inherited" isochron age, because it is quite obvious, as the samples are collected, whether the date must reflect the individual samples' time of formation. The paper trail -- the Impact article -- documents that Austin knew he'd get a mantle age from whole-rock measurements of those lava flows, long before the ICR obtained a single rock sample of their own.
If isotopic dating methods are as unreliable as Austin would like us to believe, why did he have to rig his test -- by only selecting rock samples which were known in advance to fail it?
If a mainstream scientist were to fix a test in this manner, their reputation would be demolished when that fact was uncovered. The wrong meaning is assigned to the Basalt dating methods. Before the Grand Canyon Dating Project began, in his Impact article, Austin admitted in print that the selected lava flows fell into two different stratigraphic stages. That is, the very information which he used to select the flows, also clearly indicates that they did not all occur at the same time. In his subsequent bookp. We had known from the Impact articles that Austin's samples were not all cogenetic; years later we found out by his own admission that no two of them are so.
In fact, as discussed above, the selection of non-cogenetic samples is sometimes used intentionally by isotope geologists.
It is known to be a way to have an isochron dating method "look back" beyond a recent event to an earlier event -- the age of the common source of the samples. Thus, it is misleading for Austin to pretend that his resulting isochron plot should be expected to represent the age of Basalt dating methods flows themselves. A geologist in my acquaintance suggested that this FAQ should be very short: It should merely state that Austin has confirmed what mainstream geologists have known all along: The mantle is the source of much of the sampled flows' material, and Austin's sampling technique matches the technique one would use to obtain a minimum for the age of the flows' source.
It's an insufficient case against isotope dating. Austin suggests that he has " tested " the dating method. He claims that the false isochron, that he knew would result, is " unexpected. Young-Earth creationists cannot escape the fact that a large majority of isotope dating results are well-aligned with mainstream predictions, and equally well-aligned with geological relationships which even young-earthers would accept. For example, intrusive formations consistently date as being younger than the formations that they cut across. Because radiometric dating utterly refutes their biblical interpretations, young-Earth creationists YECs are desperate to undermine the reliability of these dating methods.
As part of their efforts, YECs clearly believe that they can discredit K-Ar dating if they can show that excess argon routinely enters rocks and minerals as they form. That is, they believe that excess argon will cause rocks and minerals that are supposedly less than 10, years old to have 'deceptively' old K-Ar dates of millions or billions of years. In particular, YECs attempt to demonstrate that excess argon is a 'problem' for K-Ar dating by locating examples of historically erupted volcanics, which yield K-Ar dates that are hundreds of thousands or millions of years older than their eruption dates. The data were miscopied from Dalrymple Brent Dalrymple is a geochronologist with 40 years experience, a pioneer in the identification of excess argon in igneous samples, and an outspoken critic of young-Earth creationism e.
As part of his seminal work on excess argon, Dalrymple dated 26 historical lava flows with K-Ar to determine whether excess argon was present. Of the 26 lava flows that were sampled and analyzed, 18 of them gave expected results. That is, no excess 40Ar or 36Ar were present. Eight rocks yielded unrealistic dates, which were either too old because of the presence of excess 40Ar 5 of them or too young negative ages because of the presence of excess 36Ar 3 of them. The details on the 8 anomalous samples are listed in Table 2 of Dalrymplep. Etna basalts a 'date' ofyears for a sample that erupted in AD and a K-Ar 'date' ofyears for the other sample, which erupted in BCa plagioclase from Mt.
Lassen, California 'dated' atyears; erupted in ADand a basalt from Sunset Crater, Arizona 'dated' atandyears; erupted in AD. Dalrymple found that they are reliable. Two-thirds of the time there is no excess argon at all.