Accretion of Japanese island arcs and implications for the origin of Archean greenstone belts

Article Abstract:

A kinematic model for the development of Archean greenstone belts can be derived from the region created by the collision between the Izu-Bonin Arc and Japan's Honshu Arc. The region, called the Izu Collision Zone (ICZ), possesses a crust whose compositional assemblage, thermal structure and structural style present similarities with those of Archaen greenstone belts. The ICZ crust exhibits a tectonic style similar to Archaen convergent margins.

Izu Peninsula

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Structural relationships along a greenstone/shallow water shelf contact, Belingwe greenstone belt, Zimbabwe

Article Abstract:

The Belingwe greenstone belt in Zimbabwe has a thick tholeiitic basalt and komatiite sequence above the shallow water shelf rocks, and the nature of the contact plays an important role in the tectonic setting of greenstone belts. The tholeiitic basalt and komatiite together form the Mberengwa allochthon. The distribution of the rock types indicate that the tectonic history indicated by the Belingwe belt may be found all over central Zimbabwe.

Observations, Zimbabwe

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Formation of an Archean tectonic melange in the Schreiber-Hemlo greenstone belt, Superior Province, Canada: Implications for Archean subduction-accretion process

Article Abstract:

Detailed structural mapping and geochemistry of sedimentary, volcanic and intrusive rocks in the Schreiber assemblage of the late Archean Schreier-Hemlo greenstone belt was studied, to determine if the assemblage can be interpreted as an Archean tectonic melange. It is suggested that orogen-parallel strike-slip faulting in the Schreiber-Hemlo greenstone belt was important in magma emplacement.

Canada, Geology, Stratigraphic, Stratigraphy, Archean Eon

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