Abstract
The gas contents of granites and other continental plutonic rock samples were investigated and compared with a number of mantle rock samples and particularly with samples of the ophiolite sequence of the Troodos massif (Cyprus). The total volatile loss at 1000°C was investigated. The gas composition was analysed by means of a quadrupole mass spectrometer after releasing the gases by crushing the samples in high vacuum at room temperature. In further experiments, release of CO2 and volatile loss were determined as a function of temperature by means of derivatography. The high (about 9–15%) H2O and gas content of many mantle samples is compared to the always lower (1–2%) volatile content of crustal samples which seem to have been at least partially degassed in the course of geological evolution of the Earth’s crust. It is assumed that the primordial atmosphere originated in the degassing of the crust. Gas carrier magmatic rocks in the deeper layers of the Earth, in the mantle still contain the components of the primordial atmosphere. Some of them are accessible and were analysed in this work.
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Dedicated to Prof. I. Tarján on his 70th birthday.
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Szalay, A. Gas carrier and degassed magmatic rocks and the primordial atmosphere. Acta Physica 53, 291–298 (1982). https://doi.org/10.1007/BF03156198
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DOI: https://doi.org/10.1007/BF03156198