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  4. Molecular and isotopic signatures of life surrounding the Neoproterozoic Snowball Earth events
 
Zitierlink URN
https://nbn-resolving.de/urn:nbn:de:gbv:46-00106925-15

Molecular and isotopic signatures of life surrounding the Neoproterozoic Snowball Earth events

Veröffentlichungsdatum
2017-12-08
Autoren
Van Maldegem, Lennart Martijn  
Betreuer
Hallmann, Christian  
Gutachter
Pancost, Richard  
Zusammenfassung
Life on Earth transitioned from being mainly dominated by bacteria prior to the Cryogenian Snowball Earth events (717a 635 Ma) to an ecosystem in which biologically more complex eukaryotes (e.g. Archaeplastida and Metazoa) where able to proliferate. Using lipid biomarker analyses combined with inorganic and isotopic geochemical techniques, this dissertation investigates the sedimentary rocks of the Chuar Group ( 750 Ma, Grand Canyon, USA) and Araras Group ( 635 Ma, Amazon Craton, Brazil), to gain a greater understanding about the environments and community compositions before and after the Cryogenian glaciations. This work shows how the ecosystem recovered after the Snowball Earth events and investigates the carbon isotopic relationship between bulk organic matter and individual hydrocarbons in the Proterozoic. Overall this work observes heterotrophic organisms played a significant role in the investigates Precambrian environments, highlighting their importance in ancient ecosystems.
Schlagwörter
Biomarkers

; 

Carbon isotopes

; 

Neoproterozoic

; 

Snowball Earth

; 

Heterotrophs
Institution
Universität Bremen  
Fachbereich
Fachbereich 05: Geowissenschaften (FB 05)  
Dokumenttyp
Dissertation
Zweitveröffentlichung
Nein
Sprache
Englisch
Dateien
Lade...
Vorschaubild
Name

00106925-1.pdf

Size

13.69 MB

Format

Adobe PDF

Checksum

(MD5):79d71aa22e817d2f8f6414b577c246d6

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