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Apatite in early Archean Isua supracrustal rocks, southern West Greenland: its origin, association with graphite and
 

Summary: Apatite in early Archean Isua supracrustal rocks, southern
West Greenland: its origin, association with graphite and
potential as a biomarker
Aivo Lepland a,b,
1, Gustaf Arrhenius a
, David Cornell c
a
Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92092-0236, USA
b
Institute of Geology, Tallinn Technical University, EE-0001 Tallinn, Estonia
c
Earth Sciences Centre, Gošteborg University, Box 460, SE-40530, Gošteborg, Sweden
Received 19 September 2001; accepted 6 August 2002
Abstract
Rare earth element (REE) abundances in individual apatite crystals in banded iron formations (BIFs), metacherts,
metacarbonates and mafic dykes in the Isua supracrustal belt (ISB) have been determined by laser ablation inductively
coupled plasma mass spectrometry. The results together with petrographic observations on the distribution of graphite
have been used to track the origin of the different compositional types of apatite and to evaluate the potential, proposed
in earlier studies, for use of the apatite-graphite association as a biomarker. The chondrite-normalized distribution
patterns of apatite in metasedimentary BIFs and metacherts fall into three groups. Relatively flat profiles with distinct

  

Source: Arrhenius, Gustaf - Integrative Oceanography Division, Scripps Institution of Oceanography

 

Collections: Environmental Sciences and Ecology; Geosciences; Biology and Medicine