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Laurentia

Laurentia, juga dikenali sebagai kraton Amerika Utara

Laurentia atau Kraton Amerika Utara ialah muka benua atau "kraton" yang besar yang membentuk teras geologi purba benua Amerika Utara. Beberapa kali di masa lalu, Laurentia telah menjadi benua yang berasingan, kerana ia kini dalam bentuk Amerika Utara, walaupun pada asalnya ia juga termasuk kawasan-kawasan cratonik Greenland dan juga bahagian barat laut Scotland, yang dikenali sebagai Hebridean Terrane. Pada masa-masa yang lain di masa lalu, Laurentia telah menjadi sebahagian daripada benua dan superbenua lebih besar dan itu sendiri terdiri daripada banyak terran yang lebih kecil yang dipasang pada rangkaian ikat orogenik awal Proterozoik. Mikrobenua kecil dan pulau-pulau lautan bertembung dan disedut ke Laurentia yang sentiasa berkembang, dan bersama-sama membentuk cagar tanah Prakambrium stabil yang dilihat hari ini.[1][2]

Kraton ini dinamakan sempena Dataran Laurentius yang menempatkan Pergunungan Laurentius mendekati Sungai St. Lawrence yang pada asasnya dinamakan sempena Laurentius, seorang paderi Romawi bergelar santo.[3]

  1. ^ Dalziel, I.W.D. (1992). "On the organization of American Plates in the Neoproterozoic and the breakout of Laurentia". GSA Today. 2 (11). m/s. 237–241.
  2. ^ Hoffman, Paul F. (1988). "United Plates of America, The Birth of a Craton: Early Proterozoic Assembly and Growth of Laurentia" (PDF). Annual Review of Earth and Planetary Sciences. 16: 543–603. Bibcode:1988AREPS..16..543H. doi:10.1146/annurev.ea.16.050188.002551.
  3. ^ Graham, Joseph (2005). "The Laurentians". Naming the Laurentians: A History of Place Names 'up North'. m/s. 15.

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Laurentia
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