Hypothesis
发表于 2025-3-21 19:20:26
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Arboreal
发表于 2025-3-21 21:41:06
Measurement of Geologic Time by the Rubidium-Strontium Method,pe of rubidium in nature was not positively identified until 1937. In that year H., S., and W. (1937) separated strontium from a specimen of lepidolite from the Silver Leaf Mine in Manitoba, and M. (1937) showed by mass spectroscopy that 99.7 percent of this strontium was .Sr. Since rubidium was kno
conceal
发表于 2025-3-22 02:32:12
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统治人类
发表于 2025-3-22 05:00:02
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扩张
发表于 2025-3-22 12:10:39
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啮齿动物
发表于 2025-3-22 13:31:53
Alkalic Rocks and Carbonatites, than in orogenic belts. B. (1969) estimated that in North America, alkalic rocks occupy a total surface area of only about 1500 square miles, and H. (1966) concluded that the . areal exposure of carbonatites is only about 200 square miles. Yet D. (1933) wrote that as many as one-half of the names t
Control-Group
发表于 2025-3-22 18:23:24
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Analogy
发表于 2025-3-22 23:54:47
Sedimentary Rocks and the Oceans,rocks as well as studies of the variation of the .Sr/.Sr ratios of the oceans in the geologic past. While much progress has been made, many challenging problems remain to be solved. In this chapter we shall examine what has already been done and point out where more progress is still to be made.
确保
发表于 2025-3-23 03:07:00
Isotopic Homogenization of Strontium in Open Systems,e now return to the problem of dating by the Rb-Sr method. We stated in Chapter II that one of the prerequisites for dating rocks or minerals is that their concentrations of rubidium and strontium and their .Sr/.Sr ratios must have changed only as a result of decay of .Rb to .Sr. When this condition
bifurcate
发表于 2025-3-23 07:39:21
Meteorites,d they are classified accordingly as stones, irons, or stony irons. The stony meteorites are made up of olivine, orthopyroxene, and small amounts of other silicate minerals such as feldspar and diopside. The irons are composed mainly of the iron-nickel alloys taenite and kamacite, but they also cont