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11_drift_paleomag_10_post - 11 Continental Drift...

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ft, Paleomag: ft, Paleomag: 1 11: Continental Drift, Paleomagnetism
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ft, Paleomag: ft, Paleomag: 2 Why is this important? Continental drift is the forerunner to plate tectonics , which explains the first-order topography of Earth’s surface; the distribution of mountain belts, fossils, and climate-sensitive sedimentary rocks; how the arrangement of continents and oceans has changed through time; and the locations and ultimate cause of earthquakes and volcanoes. It also provides a framework for exploring for natural resources.
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ft, Paleomag: ft, Paleomag: 3 Timeline 1620 : Sir Francis Bacon --the similarity in the shape of the coastlines of South America and Africa is “no mere accidental occurrence.” Wikipedia Wikipedia
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ft, Paleomag: ft, Paleomag: 4 1858 : Antonio Snider-Pellegrini proposed that all continents were previously assembled in one giant continent that subsequently broke apart due to Noah’s flood. Timeline Wikipedia
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ft, Paleomag: ft, Paleomag: 5 1912 (lecture)- 1915 (book: Die Entstehung der Kontinente und Ozeane ): Alfred Wegener summarized previous work along with his own research to propose the theory of continental displacement (wrongly translated as continental drift) and the former existence of the supercontinent of Pangea Timeline Fig. 3.2 Fig. 3.2 Wikipedia
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ft, Paleomag: ft, Paleomag: 6 Continental drift--evidence Jigsaw fit of continents; matching coastlines Fig. 3.2 Fig. 3.2 Late Paleozoic-Early Late Paleozoic-Early Mesozoic Mesozoic (300-200 Ma) (300-200 Ma) Pangea Pangea
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ft, Paleomag: ft, Paleomag: 7 Continuity of similar rock units (now separated by oceans) when continents are restored Continental drift--evidence Fig. 3.6 Fig. 3.6
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ft, Paleomag: ft, Paleomag: 8 Similarity of Similarity of non-marine non-marine fossils now separated by oceans fossils now separated by oceans Fig. 3.5 Fig. 3.5 Continental drift--evidence
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ft, Paleomag: ft, Paleomag: 9 Rocks now exposed near equator : evidence of past glaciations Fig. 3.3 Fig. 3.3 Continental drift--evidence
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ft, Paleomag: ft, Paleomag: 10 10 Fig. 3.3 Fig. 3.3 Rocks now exposed near equator : evidence of past glaciations Continental drift--evidence
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ft, Paleomag: ft, Paleomag: 11 11 Past tropical conditions in now polar regions Fig. 3.4 Fig. 3.4 Continental drift--evidence
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ft, Paleomag: ft, Paleomag: 12 12 Continental drift--cause Continents plowed through oceanic crust; caused by Earth’s rotation 1924: Harold Jeffreys determines that Wegener’s proposed driving mechanism of continental drift was too weak to move continents through strong oceanic crust. Thus, most geologists rejected Wegener’s theory www.york.ac.uk
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ft, Paleomag: ft, Paleomag: 13 13 Importance of isostasy Those who opposed continental drift required submerged land bridges to explain why now-widely-separated continents contain similar non-marine fossil species but different modern species. However, can continental crust sink into the mantle?
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