Geology 1003 note (3)

Geology 1003 note (3) - Geology 1003 notes(3 I Late Archean...

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Geology 1003 notes (3) I. Late Archean to Early Proterozoic A. This time period can be broken up into three sections: 1. Neoproterozoic (0.5 BY – 1 BY) 2. Mesoproterozoic (1 BY – 1.6 BY) 3. Paleoproterozoic (1.6 BY – 2 BY) B. Late Archean Scene: 1. mafic crust → felsic crust a. mafic crust is easily subducted, but felsic crust isn’t b. mafic crust can be subducted under the felsic crust, but not reverse 2. Protocontinents: a small body of continental lithosphere a. ex: Barberton Mountain Land 3. coalesce: fuse together a. crusts coalesce to form cratons i. cratons: strong areas of continental crust that have not undergone tectonic deformation since Precambrian or early Paleozoic time. 4. there are shallow marine sediments in intracratonic sedimentary basins a. “modern” sediments 5. the late Archean marks the beginning of more modern looking things C. Proterozoic: 1. onset of modern plate tectonics a. two themes of plate tectonics: i. assembly of protocontinents in North America –
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Geology 1003 note (3) - Geology 1003 notes(3 I Late Archean...

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