The collision of the newly created Laurasia (North America and Baltica) and Gondwana caused the Iapetus Ocean to close which lead to the Taconic orogeny. This is further explained below.
Generally, The Taconic Orogeny: In the Late Ordovician, the volcanic arc clashed with eastern Laurentia (around 450 m.y. ago). Newfoundland to New York experienced deformation. The previously deposited sedimentary strata underwent metamorphosis and foliation in the center of the newly created mountain belt.
In conclusion, The closing of the Iapetus Ocean was a direct cause of the Taconic orogeny, which was triggered by the collision between the newly formed Laurasia (which included North America and Baltica) and Gondwana.
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