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Cross-examining Earth's oldest stromatolites: Seeing through the effects of heterogeneous deformation, metamorphism and metasomatism affecting Isua (Greenland)∼3700 Ma sedimentary rocks

Nutman, Allen P.; Bennett, Victoria; Friend, C. R. L.; Van Kranendonk, M. J.; Rothacker, Leo; Chivas, A. R.


The ∼3700 Ma and 3800 Ma meta-volcanic and -sedimentary rocks in the Isua supracrustal belt (Greenland) were affected by heterogeneous ductile deformation under amphibolite facies conditions (∼500–650 °C), and variably modified by secondary silica and carbonate mineralisation deposited from diagenetic and metasomatic fluids. Rare low-deformation areas preserve original volcanic features – submarine basaltic pillows and sedimentary features – including bedding. These are best-preserved in two...[Show more]

CollectionsANU Research Publications
Date published: 2019-05-18
Type: Journal article
Source: Precambrian Research
DOI: 10.1016/j.precamres.2019.105347


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