HistGeolChapt11 - Chapter 11 - Late Paleozoic Mountain...

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Chapter 11 - Late Paleozoic Mountain building events that began with the Taconic Orogeny continued throughout remainder of Paleozoic. Events are preserved in the rock record as part of the “building of Pangaea”. Silurian (438 to 408 m.y.) - Laurentia and Baltica collided along a convergent plate boundary to form the larger continent of Laurasia. This collision closed the northern Iapetus Ocean = the Caledonian orogeny.
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Silurian Period – peak of Tippecanoe inundation, prior to initiation of Caledonia uplift. Majority of craton covered by epeiric sea with carbonate bottom conditions. 2
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Devonian Period The presence of widespread reefs and evaporite deposits indicate the climate was uniformly warm and mild world- wide, and generally dry. http://www.palaeos.com/Paleozoic/Devonian/Devonian.htm Laurentia/Baltica collision = uplift of Caledonian Highlands – Acadian Orogeny 3
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Devonian Period (408 to 360 m.y.) Mountain building continued along the eastern margin of Laurentia with the Acadian orogeny (Laurentia + Baltica collision = Laurasia). Acadian Orogeny – rejuvenation of highlands, more active in present NE portion of continent, renewed deposition of clastic wedge to NW – Catskill Delta, similar to Queenston Delta. Antler Orogeny – marked change in Cordilleran (west continent) from a passive to an active margin. Kaskaskia Sequence deposition began with gradual inundation during the early Devonian Period. 4
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Kaskaskia Sequence basal sediments include clean quartz sands containing heavy mineral deposits. Clastics derived from Acadian Highlands from two source areas: 1) Older sedimentary units of east and north (tourmaline, zircon & rutile); 2) Igneous and metamorphic origin from highlands (unstable pyroxene, amphibole, biotite & garnet) Continuing transgression resulted in lime-muds and reef complexes. Locally restricted sites Late Devonian Black Shales near "eastern" craton
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This note was uploaded on 03/27/2012 for the course GEOL 2413 taught by Professor Moody during the Spring '10 term at Texas A&M University, Corpus Christi.

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HistGeolChapt11 - Chapter 11 - Late Paleozoic Mountain...

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