Collisional Snowbird tectonic zone resurrected: Growth of Laurentia during the 1.9 Ga accretionary phase of the Hudsonian orogeny

被引：147

作者：

Berman, R. G. ^{[1
]}

Davis, W. J. ^{[1
]}

Pehrsson, S. ^{[1
]}

机构：

[1] Geol Survey Canada, Ottawa, ON, Canada

来源：

GEOLOGY | 2007年 / 35卷 / 10期

关键词：

geochronology; SHRIMP data; in situ ages; pressure-temperature conditions; tectonic models; Trans-Hudson orogen; Canadian shield;

D O I：

10.1130/G23771A.1

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

The similar to 2800-km-long Snowbird tectonic zone is one of the most controversial tectonic features of the Canadian shield. Metamorphic and in situ geochronologic data reported here reveal that a 1.9 Ga medium- to high-pressure belt extends along most of this tectonic zone. In contrast to recent interpretations, a collisional origin is indicated by the length of this metamorphic belt, tectonic thickening documented in parts of it, geological contrasts across it, and subduction-type microdiamonds within it. This collisional event marks a pre-1.865 Ga phase of the Hudsonian orogeny involving microcontinent accretion that was fundamental to the growth of Laurentia.

引用

页码：911 / 914

页数：4

共 40 条

[1]

ASPLER LB, 2001, PALEOPROTEROZOIC INT, V141, P287, DOI DOI 10.1016/S0037-0738(01)00080-X

[2] Eclogites of the Snowbird tectonic zone: petrological and U-Pb geochronological evidence for Paleoproterozoic high-pressure metamorphism in the western Canadian Shield [J].