Structure of a Volcanic to Non-volcanic Transitional Margin Segment off Nova Scotia, Atlantic Canada

Details Structure of a Volcanic to Non-volcanic Transitional Margin Segment off Nova Scotia, Atlantic Canada Structure of a Volcanic to Non-volcanic Transitional Margin Segment off Nova Scotia, Atlantic Canada

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....7385d&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #7385

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Scientific paper

The rifted continental margin along much of the Atlantic coast of eastern North America is classified as volcanic, with thick sequences of igneous material emplaced at the continent-ocean transition during Late Triassic to Early Jurassic rifting. A strong, linear magnetic anomaly (ECMA) is observed along the margin from the Blake Spur fracture zone to the Scotian margin, coincident with the mapped extent of igneous material. Off Nova Scotia, the anomaly changes character, becoming disjointed and lower in amplitude until it fades to the east into the regional background level. The loss of magnetic signature plus changes in other characteristics such as the disappearance of seismic seaward dipping reflectors (SDRs) have suggested that most of the Scotian margin is primarily non-volcanic, with the transition occurring northeast of the New England seamounts. However, this interpretation has not previously been substantiated and raises many questions about the transition in time and space from a volcanic margin to one on which melt production was inhibited. New wide-angle seismic reflection / refraction data were collected in 2001 across the ECMA off southwestern Nova Scotia. Preliminary interpretations of the data provide estimates of the thickness and lateral extent of the volcanic layers, and help to identify the continent-ocean transition along this part of the margin. This new information is being used to constrain simple 2D models of magnetic structure, to compare the Scotian margin volcanic volumes and magnetization parameters with those determined to the south where the volcanic nature of the margin is well-established. The results provide insight into the changing thermal and mechanical conditions that led to the gradual reduction in volcanism and eventual transition to a non-volcanic style of rifting along the Scotian margin.

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