Correlation of Avalonian regions and their role in Paleozoic orogenies
Conference
·
· Geol. Soc. Am., Abstr. Programs; (United States)
OSTI ID:6875951
Avalonian regions are characterized by rock types usually found in tectonically active settings. Differences between Avalonian regions suggest that they do not share a specific common history: 1) regions show little similarity in basement age and characteristics: 2) separate regions began forming at different times: 3) not all regions show evidence of Cadomian I orogenesis: 4) timing and style of Avalonian-Cadomian II orogenesis varies between regions; and 5) Cambrian sections differ in lithologic character. Development of Avalonian regions maybe similar to modern circum-pacific activity, where similar age rocks, associated with active tectonism, are being formed around the perimeter of the Pacific Ocean. Evolution of Avalonian regions could, at least in part, be related to Pan African tectonism and regions may constitute part or parts of a mobile belt at the margin of the African craton. Avalonian regions may be divided into three regions that acted independently of each other during the Paleozoic. The first region (Carolina Slate Belt and the Nashoba Zone of Southeaster New England) may have accreted to North America during the Ordovician. The second region (Nova Scotia, Newfoundland, Avalonian regions in the United Kingdom, and Britany) rifted from Gondwana after the Ordovician and collided with Laurasia during the Devonian-Acadian orogeny. The third region (Boston Platform and New Brunswick) remained attached to Gondwana throughout the Paleozoic, and collided with Laurasia during the Permian Alleghanian orogeny.
- Research Organization:
- Oak Ridge National Laboratory, TN (USA)
- OSTI ID:
- 6875951
- Report Number(s):
- CONF-8510489-
- Conference Information:
- Journal Name: Geol. Soc. Am., Abstr. Programs; (United States) Journal Volume: 17
- Country of Publication:
- United States
- Language:
- English
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