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Zhong & Chen 1992

Zhong, H. and Chen, J. (1992). Carbon isotope evidence for lower biomass about 1400 Ma ago. Bulletin of the Geological Society of Denmark 1992(2): 160-168.

In THE Ming Tomb section (Beijing) and Jixian section (Tianjing), the carbon isotope measurement in marine carbonates of 1400Ma old show light delta (super 13) C values comparative to that of Cenozoic carbonates. The samples studied are basically of original carbon isotope composition, and the lighter delta (super 13) C may be of global characteristic at that time. This widely distributed lighter original delta (super 13) C was caused by a lower organic carbon buried rate, and the organic carbon buried rate was correlated to the biomass because of lacking free oxygen in middle Perterozoic atmosphere. The lighter delta (super 13) C measured may be thus explained by the existence of lower global biomass. Finally, the biomass produced by organisms before 1400Ma is estimated, at least 8.11X10 (super 8) tons per year.

BACKGROUND DATA FILES

	Abstract

Keywords
Asia; Beijing China; biomass; C-13/C-12; carbon; carbonate rocks;, China; Far East; geochemistry; Hebei China; isotopes; Jixian, China; Mesoproterozoic; Ming Tomb; organic carbon; organic, compounds; organic materials; Precambrian; Proterozoic;, sedimentary rocks; stable isotopes; upper Precambrian, 12 Stratigraphy; 02D Isotope geochemistry

Journal
Bulletin of the Geological Society of Denmark
http://www.2dgf.dk/Publikationer/ramme-publikat.htm

Publisher
Geological Society of Denmark
Geological Museum
Oster Voldgade 5-7
DK-1350 Copenhagen K
+45-3532-2354
+45-3532-2325
dgf@geologi.com