Tectono-stratigraphic evolution of the Early Proterozoic Wisconsin magmatic terranes of the Penokean Orogen
Tectono-stratigraphic evolution of the Early Proterozoic Wisconsin magmatic terranes of the Penokean Orogen
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佩诺基造山带早元古代威斯康星州岩浆地体的构造地层演化
DOI：
10.1139/e89-180
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发表时间：
1989
影响因子：
1.4
通讯作者：
Z. Peterman
中科院分区：
文献类型：
--
作者：
P. Sims;W. R. Schmus;K. Schulz;Z. Peterman
早元古代Penokean造山带沿太古宙上克拉通南缘发育。造山带由位于太古宙基底之上的北部变形大陆边缘棱柱和南部洋弧组合威斯康星州岩浆地体组成。南倾的尼亚加拉断裂(缝合)带将南向大陆边缘与增生的弧形地体分开。缝合带包含一块被肢解的蛇绿岩。威斯康星州的岩浆地体由两个根据岩性和构造区分的地体组成。北部Pembine-Wausau地体含有1860年至1889年 Ma期间沉积的拉斑玄武岩和钙碱性火山岩的主要系列，以及1835年至1845年 Ma左右沉积的较为受限的钙碱性火山岩系列。花岗岩类岩石的年龄约为1870年至1760年 Ma，侵入火山岩。较老的层序形成于南倾俯冲之上的岛弧和(或)闭合的弧后盆地。
The Early Proterozoic Penokean Orogen developed along the southern margin of the Archean Superior craton. The orogen consists of a northern deformed continental margin prism overlying an Archean basement and a southern assemblage of oceanic arcs, the Wisconsin magmatic terranes. The south-dipping Niagara fault (suture) zone separates the south-facing continental margin from the accreted arc terranes. The suture zone contains a dismembered ophiolite.The Wisconsin magmatic terranes consist of two terranes that are distinguished on the basis of lithology and structure. The northern Pembine–Wausau terrane contains a major succession of tholeiitic and calc-alkaline volcanic rocks deposited in the interval 1860–1889 Ma and a more restricted succession of calc-alkaline volcanic rocks deposited about 1835 – 1845 Ma. Granitoid rocks ranging in age from about 1870 to 1760 Ma intrude the volcanic rocks. The older succession was generated as island arcs and (or) closed back-arc basins above the south-dipping subducti...