Life development on the boundary lava-water (on the example of Palaeoproterozoic Ongeluk lavas of South Africa)

作者: D. Cornell , M. Astafieva , A. Rozanov

DOI:

关键词:

摘要: It is shown on the example of Early Proterozoic pillow-lavas South-Africa that boundary lava – water very interesting from point view bacterial paleontology. In rocks, corresponding to this boundary, such forms as bacteria, including cyanobacteria, developed, cyanobacterial or mats formed and probably even highly organized eucaryots existed. Present-day microbial life known both in surface rocks deep underground. The main part terrestrial microorganism biomass Microorganisms inhabit wet fissures volcanogenic leave evidence their existence imprints rock chemical remains vital functions. Under subsurface conditions, manifestations recent are often closely connected with between water. most ancient microfossils were described Mezo-Archaean Barberton Greenstone belt South Africa. supposed inhabited these underwater just after extrusion about 3.5 GA ago (Furnes et al., 2004). J. Schopf (1993) was first discover fossil filament microbes, resembling Archaean (3.465 Ga) Western Australia. Another discovery (3.235 massive sulphide deposits Pilbara Craton case confined a system thermal springs (Rasmussen, 2000). work samples studied pillow selvages Palaeoproterozoic Ongeluk lavas western margin Kaapvaal Africa . A refinement earlier dates for Ongeluk-Hekpoort Pb-Pb isochron age 2222±13 Ma. rather diverse set pseudomorphs biogenic objects found pillow-lavas. Among filaments, cocci others. elemental composition host identical. As rule silicon iron (in variable ratios) predominate, there also aluminium, calcium magnesium. Solidifying during eruptions create favourable conditions development. On Forms which not (from our view) mats.

参考文章(3)
Harald Furnes, Neil R Banerjee, Karlis Muehlenbachs, Hubert Staudigel, Maarten de Wit, Early Life Recorded in Archean Pillow Lavas Science. ,vol. 304, pp. 578- 581 ,(2004) , 10.1126/SCIENCE.1095858