美国伊利诺斯盆地深部基底寒武系碎屑锆石年代学:Laurentia中部古元古代-寒武系构造与沉积演化的证据

IF 1.5 4区 地球科学 Q2 GEOLOGY Journal of Geology Pub Date : 2020-04-15 DOI:10.1086/708432
Jared T. Freiburg, M. Holland, D. Malone, S. Malone
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引用次数: 11

摘要

我们从美国伊利诺斯盆地的三个新的深钻孔中获得960个碎屑锆石。这些锆石年龄谱揭示了伊利诺伊盆地晚古元古代至早寒武纪构造历史的新细节,包括Reelfoot裂谷发育时间和Rodinia分裂时间的证据。最古老的碎屑锆石群为~1650 Ma,比盆地其他深钻岩心中已知的结晶岩年龄都要早,在该地区其他寒武系地层中明显缺失。我们认为这个种群来自于存在于伊利诺斯盆地之下的晚古元古代地壳,并在寒武纪地层沉积期间暴露出来。主要年龄峰为~1375 Ma,为南花岗流纹岩省火成岩的特征,同时也存在于东花岗流纹岩省圣弗朗索瓦山脉(EGRP)。~1460 Ma碎屑锆石的次峰反映了伊利诺斯盆地外围测定的EGRP晶体岩石的已知年龄。这个寒武纪地层中的碎屑锆石群可能反映了伊利诺斯盆地下~1370 Ma地壳的丰度比目前所认识的要高。这些数据表明,伊利诺斯盆地的基础寒武纪砂岩具有碎屑锆石物源,这与上覆的晚寒武纪arenites不同,并且以前未知的Reelfoot裂谷的北部分支延伸到伊利诺斯州中部,比目前绘制的位置向北延伸了300多公里。Reelfoot裂谷的裂口是新元古代和早寒武纪Rodinia大裂谷的一部分,其锆石可能来自Reelfoot裂谷火成岩,年龄在540 ~ 525 Ma之间。
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Detrital Zircon Geochronology of Basal Cambrian Strata in the Deep Illinois Basin, USA: Evidence for the Paleoproterozoic-Cambrian Tectonic and Sedimentary Evolution of Central Laurentia
We present 960 detrital zircon ages from three new, deep boreholes from the Illinois Basin, USA. These zircon age spectra reveal new details of the late Paleoproterozoic through early Cambrian tectonic history of the Illinois Basin, including evidence of the timing of the development of the Reelfoot Rift and breakup of Rodinia. The oldest detrital zircon population is ~1650 Ma, older than any known age for crystalline rocks from other deep drill cores in the basin and conspicuously absent in other Cambrian strata in the region. We interpret this population to have been derived from late Paleoproterozoic crust that exists beneath the Illinois Basin and was exposed during the deposition of Cambrian strata. The principal age peak is ~1375 Ma, characteristic of igneous rocks of the Southern Granite-Rhyolite Province but also present in the St. Francois Mountains of the Eastern Granite-Rhyolite Province (EGRP). A secondary peak of ~1460 Ma detrital zircon reflects the known ages of crystalline rocks that characterize EGRP determined from along the periphery of the Illinois Basin. This population of detrital zircon in Cambrian strata may reflect a greater abundance of ~1370 Ma crust beneath the Illinois Basin than presently recognized. These data reveal that basal Cambrian sandstones in the Illinois Basin have a detrital zircon provenance that is distinct from the overlying late Cambrian arenites and that a previously unknown northern arm of the Reelfoot Rift extends into central Illinois, which is more than 300 km further north than currently mapped. The opening of the Reelfoot Rift, which was part of the broader rifting of Rodinia during the Neoproterozoic and early Cambrian, is marked by zircons, probably from Reelfoot Rift igneous rocks, that range from 540 to 525 Ma.
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来源期刊
Journal of Geology
Journal of Geology 地学-地质学
CiteScore
3.50
自引率
5.60%
发文量
0
审稿时长
3 months
期刊介绍: One of the oldest journals in geology, The Journal of Geology has since 1893 promoted the systematic philosophical and fundamental study of geology. The Journal publishes original research across a broad range of subfields in geology, including geophysics, geochemistry, sedimentology, geomorphology, petrology, plate tectonics, volcanology, structural geology, mineralogy, and planetary sciences. Many of its articles have wide appeal for geologists, present research of topical relevance, and offer new geological insights through the application of innovative approaches and methods.
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