Provenance of Quartz Arenites of the Early Paleozoic Midcontinent Region, USA
Provenance of Quartz Arenites of the Early Paleozoic Midcontinent Region, USA
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美国中大陆地区早古生代石英砂岩的来源
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
J. Craddock
中科院分区：
文献类型：
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作者：
A. Konstantinou;K. Wirth;J. Vervoort;D. Malone;C. Davidson;J. Craddock
石英砂岩是大陆中部地区早古生代沉积历史的主要特征。尽管有许多研究，但关于这些砂岩如何形成的长达一个世纪的争论仍然没有解决，主要是因为沉积物的成分和结构纯度。在这项研究中，我们提出了一个广泛的数据集碎屑锆石年代学从早古生代超成熟砂屑岩的大陆中部地区，我们提供了新的限制其成因。我们的研究结果，再加上汇编的物源信息，从老盆地和造山带可能表明，寒武纪和奥陶纪砂屑岩代表沉积改造主要是两个不同的老盆地。寒武-奥陶纪沉积物通过两个早古生代河流系统搬运到大陆中部地区，这两个河流系统分别来自古东部（休伦盆地）和古东北部（大陆中部裂谷区）。
Quartz arenites characterize much of the early Paleozoic sedimentary history of the midcontinent region. Despite numerous studies, the century-long debate on how these arenites formed is still unresolved, primarily because of the compositional and textural purity of the deposits. In this study, we present an extensive data set of detrital zircon geochronology from the early Paleozoic supermature arenites of the midcontinent region, and we offer new constraints about their origin. Our results coupled with compiled provenance information from older basins and orogens may indicate that the Cambrian and Ordovician arenites represent sediment reworking primarily of two different older basins. The Cambro-Ordovician sediment was transported to the midcontinent region by two early Paleozoic river systems that sourced from the paleo-east (Huron basin) and paleo-northeast (midcontinent rift region).