New Lu-Hf and Pb-Pb Age Constraints on the Earliest Animal Fossils

DSpace/Manakin Repository

New Lu-Hf and Pb-Pb Age Constraints on the Earliest Animal Fossils

Citable link to this page

. . . . . .

Title: New Lu-Hf and Pb-Pb Age Constraints on the Earliest Animal Fossils
Author: Frei, Robert; Xiao, Shuhai; Albarede, Francis; Baker, Joel; Knoll, Andrew; Barfod, Gry H.; Telouk, Philippe

Note: Order does not necessarily reflect citation order of authors.

Citation: Barfod, Gry. H., Francis Albarede, Andrew H. Knoll, Shuhai H. Xiao, Philippe Telouk, Robert Frei, and Joel Baker. 2002. New Lu-Hf and Pb-Pb age constraints on the earliest animal fossils. Earth and Planetary Science Letters 201, no. 1: 203-212.
Access Status: At the direction of the depositing author this work is not currently accessible through DASH.
Full Text & Related Files:
Abstract: The Neoproterozoic Doushantuo Formation, South China, preserves a unique assemblage of early multicellular fossils and overlies rocks, which are thought to have formed during an ice age of global extent. The age of this formation is thus critical for understanding the important biological and climatic events that occurred towards the end of the Proterozoic Eon. Until now, direct dating of sedimentary formations such as the Doushantuo has been difficult and associated with large uncertainties. Here, we show that dating of Doushantuo phosphorites by a novel Lu-Hf dating method and conventional Pb-Pb geochronometry independently yield ages of 584+/-26 Ma and 599.3+/-4.2 Ma, respectively. These ages are in agreement with bio- and chemostratigraphical observations and show that the Doushantuo animal remains predate diverse Ediacaran fossil assemblages, making them the oldest unambiguous remains of metazoans currently known. Furthermore, the Pb-Pb age for the post-glacial Doushantuo rocks suggests that the Neoproterozoic glaciation in China might predate glacial rocks in Eastern North America commonly associated with the younger (Marinoan) of two major Neoproterozoic glaciations. The combination of Lu-Hf and Pb-Pb dating shows considerable potential for dating other phosphorite successions and future application of these methods could therefore provide further constraints on Proterozoic biological and environmental history.
Published Version: http://dx.doi.org/10.1016/S0012-821X(02)00687-8
Other Sources: http://www.geol.ku.dk/pershps/robertfrei/WEB/Barfod%20et%20al.-EPSL-2002.pdf
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:3007655

Show full Dublin Core record

This item appears in the following Collection(s)

  • FAS Scholarly Articles [7362]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University
 
 

Search DASH


Advanced Search
 
 

Submitters