阿巴拉契亚盆地地下的深钻孔发现：宽罗迪尼断裂和新近纪构造热事件

IF 2.2 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Terra Nova Pub Date : 2024-07-30 DOI:10.1111/ter.12741

David W. Valentino, Jeffrey R. Chiarenzelli, Teresa E. Jordan, Robert D. Jacobi, Alexander E. Gates

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引用次数: 0

摘要

除了沿新新生代东劳伦伦大陆边缘的几个孤立的裂谷盆地外，阿巴拉契亚古生代地层不稳定地稳定在中新生代结晶基底上，反映了约 550+ Ma 的间断。然而，在纽约康奈尔大学穿过阿巴拉契亚盆地的一个近 3 千米深的实验性地热钻孔中，却意外地在寒武纪不整合地层下发现了变形的新元古代绿泥石面辉绿岩和变质火山岩（卡尤塔地层）。磁力模型显示，它们位于面积达 5000 平方公里、以断层为界的伊萨卡盆地，该盆地被认为与伊阿佩坦断裂有关。火山作用和变质作用似乎与约 600-650 Ma 的热事件有关，或与延伸无关，但在寒武纪波茨坦群沉积之前需要 5-10 km 岩石的隆起和剥蚀。伊萨卡盆地位于劳伦提斯Iapetus边缘内侧350千米处，这表明至少在纽约州和宾夕法尼亚州的劳伦提斯东部有一个宽广的新近纪断裂带。

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Deep borehole discoveries beneath the Appalachian Basin: Broad Rodinian rift and Neoproterozoic tectonothermal event

Besides a few isolated rift basins along the Neoproterozoic eastern Laurentian margin, the Appalachian Palaeozoic strata rest unconformably on Mesoproterozoic crystalline basement, reflecting a ca. 550+ Ma hiatus. However, a nearly 3 km deep experimental geothermal borehole through the Appalachian basin at Cornell University, New York, unexpectedly encountered deformed Neoproterozoic greenschist facies phyllites and metavolcanics (Cayuta Formation) beneath the Cambrian non‐conformity. Magnetic modelling shows they are in the 5000 km2 fault‐bounded Ithaca basin, proposed to be associated with Iapetan rifting. The volcanism and metamorphism appear linked to ca. 600–650 Ma thermal events related or unrelated to extension, but requiring uplift and denudation of 5–10 km of rock prior to deposition of the Cambrian Potsdam Group. The Ithaca basin is >350 km inboard of the Laurentian Iapetus margin, indicating a broad Neoproterozoic rift zone for at least the NY and PA portion of eastern Laurentia.

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来源期刊

Terra Nova 地学-地球科学综合

CiteScore

4.80

自引率

8.30%

发文量

审稿时长

2.3 months

期刊介绍： Terra Nova publishes short, innovative and provocative papers of interest to a wide readership and covering the broadest spectrum of the Solid Earth and Planetary Sciences. Terra Nova encompasses geology, geophysics and geochemistry, and extends to the fluid envelopes (atmosphere, ocean, environment) whenever coupling with the Solid Earth is involved.