DENSITIES OF METAMORPHIC ROCKS

DENSITIES OF METAMORPHIC ROCKS
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变质岩的密度

DOI:
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发表时间:
1971
期刊:
影响因子:
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通讯作者:
S. Smithson
S. Smithson
中科院分区:
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文献类型:
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作者:
S. Smithson

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尽管变质岩占结晶地壳的很大一部分,但有关变质岩密度的数据相对较少。在本文中,我们介绍了七种不同变质地形的岩石密度。岩石类型的平均密度范围从黑云花岗岩片麻岩的 2.65 克/厘米 3 到透辉石花岗岩的 3.04 克/厘米 3 。变质地形的平均岩石密度范围为 2.70 至 2.86gm/cm3。上地壳下部的岩石密度可能会降低。大多数变质地形的平均岩石密度在 2.70 至 2.79gm/cm3 之间;上晶壳常用的平均密度2.67gm/cm3太低了。
Although metamorphic rocks comprise a large part of the crystalline crust, relatively few data concerning metamorphic rock densities are available. In this paper, we present rock densities from seven different metamorphic terrains. Mean densities for rock types range from 2.65gm/cm3 for biotite granite gneiss to 3.04gm/cm3 for diopside granofels. Mean rock densities for metamorphic terrains range from 2.70 to 2.86gm/cm3. Rock density may decrease in the lower part of the upper crust. Most mean rock densities for metamorphic terrains fall between 2.70 and 2.79gm/cm3; the mean density of 2.67gm/cm3 commonly used for the upper crystalline crust is too low.