Skip to Main Content
Skip Nav Destination

Tectonic evolution of the southern Laurentian Grenville orogenic belt

Sharon Mosher
Tectonic evolution of the southern Laurentian Grenville orogenic belt
Geological Society of America Bulletin (November 1998) 110 (11): 1357-1375


The Grenville orogenic belt along the southern margin of Laurentia records more than 300 m.y. of orogenic activity culminating in arc-continent and continent-continent collision ca. 1150-1120 Ma. Exposures in Texas provide a unique profile across the Grenville orogen from the orogen core to the cratonal margin. In the Llano uplift of central Texas, ca. 1360-1232 Ma upper amphibolite-lower granulite facies, polydeformed supracrustal and plutonic rocks represent the core of the collisional orogen. This exposure contains a suture between a 1326-1275 Ma exotic island-arc terrane and probable Laurentian crust and records A-type subduction. In west Texas, 1380-1327 Ma amphibolite to greenschist facies, polydeformed supracrustal rocks are thrust over ca. 1250 Ma carbonate and volcanic rocks along the cratonal margin. The carbonate and volcanic rocks form a narrow thrust belt with post-1123 Ma synorogenic sedimentary rocks, which grade into undeformed sedimentary rocks northward on the Laurentian craton. The Texas basement reveals a consistent but evolving tectonic setting for the southern margin of Laurentia during Mesoproterozoic time. This paper summarizes recent advances in our knowledge of the Texas basement and proposes plate models to explain the tectonic evolution of this margin during Mesoproterozoic time. The orogenic history is strikingly similar to that of the Canadian Grenville orogen and requires a colliding continent off the southern Laurentian margin during the assembly of Rodinia.

ISSN: 0016-7606
EISSN: 1943-2674
Serial Title: Geological Society of America Bulletin
Serial Volume: 110
Serial Issue: 11
Title: Tectonic evolution of the southern Laurentian Grenville orogenic belt
Author(s): Mosher, Sharon
Affiliation: University of Texas at Austin, Department of Geological Sciences, Austin, TX, United States
Pages: 1357-1375
Published: 199811
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 125
Accession Number: 1999-000393
Categories: Structural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., 2 tables, geol. sketch maps
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 199901
Close Modal

or Create an Account

Close Modal
Close Modal