Life on the early Earth inhabited a planet whose environ-ment was vastly different from the Earth of today. An anaerobic and hot early Earth was the birthplace of the first living cells but the wide-spread small-scale physico-chemical diversity provided opportunities for a variety of specialists: alkalophiles, acidophiles, halophiles etc. The earliest record of life has been lost due to plate tectonic recycling and the oldest preserved terranes are quite altered by metamorphism, although they contain weak traces of fossil life. As of ~3.5 Ga, ancient sediments are so well-preserved that a broad diversity of micro-environments and fossil traces of life can be studied, providing a surprising window into communities of microbes that had already reached the evolutionary stage of photosynthesis.

Biosignatures in Deep Time

HICKMAN-LEWIS, KEYRON
Writing – Original Draft Preparation
;
Cavalazzi B.
Writing – Original Draft Preparation
2019

Abstract

Life on the early Earth inhabited a planet whose environ-ment was vastly different from the Earth of today. An anaerobic and hot early Earth was the birthplace of the first living cells but the wide-spread small-scale physico-chemical diversity provided opportunities for a variety of specialists: alkalophiles, acidophiles, halophiles etc. The earliest record of life has been lost due to plate tectonic recycling and the oldest preserved terranes are quite altered by metamorphism, although they contain weak traces of fossil life. As of ~3.5 Ga, ancient sediments are so well-preserved that a broad diversity of micro-environments and fossil traces of life can be studied, providing a surprising window into communities of microbes that had already reached the evolutionary stage of photosynthesis.
Biosignatures for Astrobiology
145
164
Westall F., Hickman-Lewis K., Cavalazzi B.
File in questo prodotto:
Eventuali allegati, non sono esposti

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/638562
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 8
  • ???jsp.display-item.citation.isi??? 8
social impact