JMDMT #680 Microfossils of Cyanobacteria in Carbonaceous Meteorites
The James M. DuPont Meteorite Collection - of meteorites. The parent asteroids went through a low temperature accumulation process, a high temperature melting and evaporation process, a stage of collision with smaller objects and finally a collision of 2 asteroidal sized bodies. These authors, and later Wiik,- observed that the carbonaceous chondrites belonged to the high iron group. Urey and Craig suggested that the material forming the carbonaceous chondrites had been infiltrated on the parent body by water, carbon compounds, and hydrogen sulfide. It is generally agreed that more information is a necessary prereq- uisite to a satisfactory understanding of the genesis of these meteorites. Wiik- has shown that there are three types of carbonaceous chondrites. The first type (Orgueil, Ivuna, Tonk) contains approximately 20 per cent water, approximately 22 per
Added: Nov 21, 2008; Author: h4ck3rm1k3; Duration: 1:7; Views: 5