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首页> 美国政府科技报告 >TRACE ELEMENT STUDIES OF ROCKS AND SOILS FROM OCEANUS PROCELLARUM AND MARE TRANQUILLITATIS
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TRACE ELEMENT STUDIES OF ROCKS AND SOILS FROM OCEANUS PROCELLARUM AND MARE TRANQUILLITATIS

机译：海洋生物和马尾松岩石和土壤的微量元素研究

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Neutron-activation data on Zn, Ga„ Ge, Cd, In and Ir are reported for six rocks and two soils from the Apollo-12 mission. A comparison of these data and similar data for Apollo-11 samples indicates extralunar components in the 12070 and 10084 soils of about 1.0 and 1.1% expressed in terms of an assumed composition which is the same as the water-free portion of CI chondrites. A relationship between the integrated flux of extralunar material and the increase in concentration of such material in the fines portion of the lunar regolith is derived. According to this relationship, the integrated flux at the Apolio-1l site is 25% higher than that at the Apollo-12 site, which in¬dicates that the influx of extralunar material has been decreasing with time* A reanalysis of the data on the Apolio-11 fines shows them to be consistent with a minor depletion in ilmenite and inclusion of a 20% component resembling wood's anorthositic gabbro. Terrestrial basalts show relatively small variations in their contents of Zn, Ga, Ge, In and possibly Cd, indepen¬dent of their geographical origin. Apollo-12 rocks have con¬centrations of Zn, Ge, Cd, In and possibly Ir which are lower by factors of 60 or more relative to terrestrial basalts* A mechanism is proposed for the late accretion of volatile-rich materials, including comets, in which a primitive terrestrial atmosphere is invoked to explain the significantly higher con¬centrations of such substances on the earth.

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