Geology of the penokean orogen area

A thick succession of arc-derived turbidites constitutes most of the foreland basin-fill along with lesser volcanic rocks.

Geology of the penokean orogen area

A thick succession of arc-derived turbidites constitutes most of the foreland basin-fill along with lesser volcanic rocks. The collision between the two domains around 1. The core of this orogeny, the Churchill Craton , is composed of terranes derived from the 1. A belt of volcanogenic massive sulfide deposits formed in the extending back-arc rift within the arc. First an island arc called the Pembine-Wausau terrane collided with the ancient North American craton along with volcanoes formed in its back-arc basin. Jump to navigation Jump to search The Penokean orogeny was a mountain-building episode that occurred in the early Proterozoic about 1. Penokean orogeny Save The Penokean orogeny was a mountain-building episode that occurred in the early Proterozoic about 1. The second phase involved a microcontinent called the Marshfield terrane , which today forms parts of Wisconsin and Illinois. Additional publication details. The Penokean orogen was strongly overprinted by younger tectonic and thermal events, some of which were previously ascribed to the Penokean. The second phase involved a microcontinent called the Marshfield terrane, which today forms parts of Wisconsin and Illinois.

The convergence of Archean blocks of the Superior and Marshfield cratons resulted in the major contractional phase of the Penokean orogeny. First an island arc called the Pembine-Wausau terrane collided with the ancient North American craton along with volcanoes formed in its back-arc basin.

A belt of volcanogenic massive sulfide deposits formed in the extending back-arc rift within the arc.

the penokean orogeny in the lake superior region precambrian research

At this same time, a suite of post-tectonic plutons intruded the deformed sedimentary sequence and accreted arc terranes marking the end of the Penokean orogeny.

The core of this orogeny, the Churchill Cratonis composed of terranes derived from the 1.

Grenville orogeny

It is composed of two domains separated by the Niagara Fault Zone: the southern, internal domain, the Wisconsin Magmatic Terranes, consists of Paleoproterzoic tholeiitic and calc-alkaline island arc rocks and calc-alkaline plutonic rocks; the northern, external domain consists of a continental margin foreland basin overlying an Archaean basement and includes the supracrustal rocks of the Animikie Group and Marquette Range Supergroup. The collision between the two domains around 1. First an island arc called the Pembine-Wausau terrane collided with the ancient North American craton along with volcanoes formed in its back-arc basin. At this same time, a suite of post-tectonic plutons intruded the deformed sedimentary sequence and accreted arc terranes marking the end of the Penokean orogeny. Synchronous extension and subsidence of the Superior craton resulted in a broad shallow sea characterized by volcanic grabens Menominee Group in northern Michigan. The Penokean orogen was strongly overprinted by younger tectonic and thermal events, some of which were previously ascribed to the Penokean. Download citation as: RIS Dublin Core Abstract The Penokean orogeny began at about Ma when an oceanic arc, now the Pembine-Wausau terrane, collided with the southern margin of the Archean Superior craton marking the end of a period of south-directed subduction. Rocks of the Pembine-Wausau arc were thrust northward onto the Superior craton causing subsidence of a foreland basin in which sedimentation began at about Ma in the south Baraga Group rocks and Ma in the north Rove and Virginia Formations. Jump to navigation Jump to search The Penokean orogeny was a mountain-building episode that occurred in the early Proterozoic about 1. Hundreds of millions of years later, the Keweenawan Rift occurred in the same area creating the basin that would eventually become Lake Superior. All rights reserved.

First an island arc called the Pembine-Wausau terrane collided with the ancient North American craton along with volcanoes formed in its back-arc basin. Principal among these was a period of vertical faulting in the Archean basement and overlying Paleoproterozoic strata.

penokean range

The newly established subduction zone caused continued arc volcanism until about Ma when a fragment of Archean crust, now the basement of the Marshfield terrane, arrived at the subduction zone.

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