OBDUCTION, BACKFOLDING AND PIGGYBACK THRUSTING IN THE METAMORPHIC HINTERLAND OF THE SOUTHEASTERN CANADIAN CORDILLERA

被引:154
作者
BROWN, RL
JOURNEAY, JM
LANE, LS
MURPHY, DC
REES, CJ
机构
[1] Carleton Univ, Ottawa, Ont, Can, Carleton Univ, Ottawa, Ont, Can
关键词
GEOLOGICAL SURVEYS - Canada - GEOPHYSICS - PETROLOGY - ROCK - Metamorphic;
D O I
10.1016/0191-8141(86)90047-7
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The (paleo-)continental margin of the southeastern Canadian Cordillera was deformed and metamorphosed mainly in the Jurassic and Cretaceous, beginning with the obduction of a composite oceanic terrane, eastwards at least 60 km, onto the western part of the continental margin in the late Early Jurassic. In the Middle Jurassic, W-verging backthrusts and backfolds developed in this region, the folds becoming increasingly overturned and attenuated a deep structural levels. This deformation of the hinterland produced major crustal thickening and regional metamorphism, which peaked in the late Middle Jurassic. The thickening mass of the hinterland curtailed westward vergence. This paper presents two balanced cross-sections; each based on available structural, petrologic, geophysical and geochronologic data. Both sections are internally consistent, and demonstrate that development of a basement duplex beneath the hinterland could have accommodated contemporaneous thin-skinned shortening of the Rocky Mountain Foreland.
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页码:255 / 268
页数:14
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