Pruritus
发表于 2025-3-26 22:23:22
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征服
发表于 2025-3-27 02:04:06
,Rb—Sr Dating of Thin Slabs: an Imperfect Method to Determine the Age of Metamorphism,istance over which isotopic equilibrations occurs is not known a priori. One is therefore faced with the following dilemma: if the system chosen for dating is small, e.g., individual mineral grains, isotopic equilibration may continue long after the event of metamorphic crystallization, and the isot
Pigeon
发表于 2025-3-27 08:25:33
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ETCH
发表于 2025-3-27 13:05:59
40Ar/39Ar Dating: Principles, Techniques, and Applications in Orogenic Terranes,ability of K-Argeochronology because it has the ability to distinguish between: (1) samples which have lost a component of radiogenic argon since their initial crystallization, (2) samples which have remained closed systems with respect to potassium and argon since their initial crystallization, and
COMMA
发表于 2025-3-27 17:15:29
The Total Lead Method,so known under other names such as the .. This author has shown in 1952 that, unlike minerals rich in U and Th, those in which they occur as trace elements (zircon, monazite, sphene, xenotime) are able to give good geochronological results. In effect, they do not incorporate any common lead at the t
Obligatory
发表于 2025-3-27 20:16:16
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杠杆
发表于 2025-3-27 22:19:10
Fission-Track Dating and Geologic Annealing of Fission Tracks, are stable over different temperature intervals in different minerals and glasses,and by dating several different minerals present in a rock it is possible to obtain a better understanding of its thermal history. This dating method, used in conjunction with other dating methods, is a powerful tool
嘲笑
发表于 2025-3-28 05:47:51
Correction and Interpretation of Fission Track Ages, out as younger than independently determined ages on the same samples. Obviously, the prerequisite that all fission tracks must be retained since the formation of the sample was not met. It is now known that track retention is a very temperature-sensitive and characteristic property of minerals and
恃强凌弱
发表于 2025-3-28 09:01:26
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碳水化合物
发表于 2025-3-28 13:19:02
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