B. Geochemical mechanisms • In relation to the early history of the earth and subsequent mechanisms of change there emerge some generalities about rock composition which are of considerable interest. • Igneous rocks formed by the solidification of melts are the major component of the earth’s crust which is now land. • These rocks are mainly silicic and basaltic types in the radio of 2:1. The major component minerals of these rocks determine fairly predictably the trace elements that solidified out with them
B. Geochemical mechanisms • In relation to the early history of the earth and subsequent mechanisms of change there emerge some generalities about rock composition which are of considerable interest. • Igneous rocks formed by the solidification of melts are the major component of the earth’s crust which is now land. • These rocks are mainly silicic and basaltic types in the radio of 2:1. The major component minerals of these rocks determine fairly predictably the trace elements that solidified out with them
C. The orgin and development of the biosphere • 3 000 – 4 000 million years ago earth: hot, pure • 2 000 – 3 000 million years ago the surface: clay, sand and limestone; Hydrosphere: H2S, NaCl, KCl etc in low concentration Atmosphere : CO2 , N2 with little H2S
C. The orgin and development of the biosphere • 3 000 – 4 000 million years ago earth: hot, pure • 2 000 – 3 000 million years ago the surface: clay, sand and limestone; Hydrosphere: H2S, NaCl, KCl etc in low concentration Atmosphere : CO2 , N2 with little H2S
• In time. Atmosphere: N2 , CO2 ; Hydrosphere: NaCl the appearance of organically formed FeO(OH) and CaCO3 and peptides, pyrimidines and purines were produced (Bernal, 1959) —— The “pure”earth was being organically polluted and eventually eobionts, became organelles, organelles oranisms and then protozoa
• In time. Atmosphere: N2 , CO2 ; Hydrosphere: NaCl the appearance of organically formed FeO(OH) and CaCO3 and peptides, pyrimidines and purines were produced (Bernal, 1959) —— The “pure”earth was being organically polluted and eventually eobionts, became organelles, organelles oranisms and then protozoa