Geologic_history_of_Precambrian_and_Pale

Geologic_history_of_Precambrian_and_Pale - R o d i n i a...

Info iconThis preview shows pages 1–13. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: R o d i n i a Future super continent Mountains formed during Pangaea assembly, e.g. Appalachians, Urals, Atlas, Scandinavia Mountains at present plate boundaries, e.g. Himalayas, Alps, Andes, NA Cordillera Mountains and Plate Tectonic Cycles Relationship between first-order sea-level changes and Plate Tectonics cycles Lowest sea levels correspond to periods when supercontinents existed. Pangea Rodinia First-order cycles of global (eustatic) sea-level change Possible explanation: sea level changes are affected byspreading rates. Periods of faster spreading rates at ridges correspond to higher sea level. Periods of slower spreading rates correspond to lower sea level. First-order cycles of climate change? Phanerozoic climate cycles and their causes are debated. The debate centers around relative significance of atmospheric CO 2 and O 2 levels and factors that determine them including volcanic activity (and ultimately-Plate Tectonics), biological activity and deposition of certain sedimentary rocks (for instance, formation of carbonate rocks removes excess CO from the atmosphere). CO 2 as a primary driver of Phanerozoic climate Dana L. Royer, Robert A. Berner, Isabel P. Montaez, Neil J. Tabor, David J. Beerling GSA Today, 14(3), 4-10 CO 2 and climate A . Comparison of model predictions (GEOCARB III; Berner and Kothavala, 2001) and proxy data. Shaded areas represent range of errors for model predictions; B. Light blue indicate cool climate, dark blue- Ice Ages; C. Distribution of direct glacial evidence (tillites, striated bedrock, etc.) by latitude (Cowley, 1998); D. Oxygen isotope data from ocean sediments matches glacial record when corrected for pH effects. A B C D www.gsajournals.org/archive/1052-5173/14/3/pdf/i1052-5173-14-3-4.pdf Major plate tectonic events of Paleozoic: breakup of Rodinia (began during late Proterozoic) and assembly of Pangea. Before Pangea, supercontinent Gondwana was assembled. Pangea during Permian R.S. Dietz and J.C. Holden, Reconstruction of Pangaea, Journal of Geophysical Research , 75:4939-4956, 1970, copyright by the American Geophysical Union. Plummer et al., 2007 Cambrian Upper Ordovician Devonian Carboniferous- Permian Paleozoic Ice Ages:- Upper Ordovician- Carboniferous- Permian Carboniferous-Permian glacial deposits Source: After Arthur Holmes, Principles of Physical Geology , 2d ed., Ronald Press Cratonic sequences and orogenies in North America during Paleozoic and Mesozoic Paleozoic orogenies (mountain building) along eastern margin: Taconic, Acadian, Ouachita, Alleghenian formed Appalachian Mountains. Antler orogeny occurred along western margin. Wicander & Monroe, 2004 Cambrian Ordovician Silurian Devonian Mississippian Pennsylvanian Permian Triassic Jurassic Cretaceous Cenozoic Paleogeographic maps of North America during Paleozoic Wicander & Monroe, 2004 Transgressions and regressions Continental crust Epeiric sea Epeiric sea Deep ocean Deep ocean land oceanic crust oceanic crust Transgression: rising sea level, marine transgression, most continent is covered by the epeiric sea...
View Full Document

This note was uploaded on 04/15/2009 for the course EARTH 122 taught by Professor Calia during the Winter '08 term at Waterloo.

Page1 / 54

Geologic_history_of_Precambrian_and_Pale - R o d i n i a...

This preview shows document pages 1 - 13. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online