IMPLICATIONS OF SMALL COMETS FOR THE NOBLE-GAS INVENTORIES OF EARTH AND MARS

Frank et al. [1986a,b] proposed the possibility of large numbers of sm all comets impacting the Earth. Using the parameters for the small com ets suggested by Frank and Sigwarth [1993], we find that, over the lif etime of the solar system, such small comets would deliver far more Ar , Kr, and Xe to the atmospheres of Earth and Mars than those atmospher es presently contain if, as Frank and Sigwarth [1993] assumed, the sma ll comets formed in very cold regions far from the Sun. Comets can be greatly depleted in noble gases if they form relatively close to the S un (for example, near Jupiter), but this source region is inconsistent with other features of the proposed model. Alternatively, if the come ts did form in very cold regions far from the Sun, the current flux wo uld have to be at least a factor of 30,000 higher than the long-term a verage.