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The origin and emergence of life under impact bombardment

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Original languageEnglish
Pages (from-to)1845-1855
Number of pages11
JournalPhilosophical Transactions of the Royal Society B: Biological Sciences
Volume361
Issue number1474
DOIs
Publication statusPublished - 29 Oct 2006
EventDiscussion Meeting on Conditions for the Emergence of Life on the Early Earth - London, United Kingdom
Duration: 13 Feb 200614 Feb 2006

Abstract

Craters formed by asteroids and comets offer a number of possibilities as sites for prebiotic chemistry, and they invite a literal application of Darwin's 'warm little pond'. Some of these attributes, such as prolonged circulation of heated water, are found in deep-ocean hydrothermal vent systems, previously proposed as sites for prebiotic chemistry. However, impact craters host important characteristics in a single location, which include the formation of diverse metal sulphides, clays and zeolites as secondary hydrothermal minerals (which can act as templates or catalysts for prebiotic syntheses), fracturing of rock during impact (creating a large surface area for reactions), the delivery of iron in the case of the impact of iron-containing meteorites (which might itself act as a substrate for prebiotic reactions), diverse impact energies resulting in different rates of hydrothermal cooling and thus organic syntheses, and the indiscriminate nature of impacts into every available lithology-generating large numbers of 'experiments' in the origin of life. Following the evolution of life, craters provide cryptoendolithic and chasmoendolithic habitats, particularly in non-sedimentary lithologies, where limited pore space would otherwise restrict colonization. In impact melt sheets, shattered, mixed rocks ultimately provided diverse geochemical gradients, which in present-day craters support the growth of microbial communities.

    Research areas

  • organics, colonization, thermophiles, asteroid, crater, INDUCED HYDROTHERMAL ACTIVITY, PREBIOTIC SYNTHESIS, AMINO-ACIDS, ORGANIC-SYNTHESIS, EARLY EARTH, BIOCHEMICAL EVOLUTION, METABOLIC CYCLES, CARBON FIXATION, SYSTEMS, ROCKS

Event

Discussion Meeting on Conditions for the Emergence of Life on the Early Earth

13/02/0614/02/06

United Kingdom

Event: Conference

ID: 25224415