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首页> 外文期刊>Journal of geodynamics >Geophysical modeling of the northern Appalachian Brompton-Cameron, Central Maine, and Avalon terranes under the New Jersey Coastal Plain
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Geophysical modeling of the northern Appalachian Brompton-Cameron, Central Maine, and Avalon terranes under the New Jersey Coastal Plain

机译：新泽西沿海平原下的北部阿巴拉契亚布罗姆普顿-卡梅伦，缅因州中部和阿瓦隆山脉的地球物理模拟

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摘要

A regional terrane map of the New Jersey Coastal Plain basement was constructed using seismic, drilling, gravity and magnetic data. The Brompton-Cameron and Central Maine terranes were coalesced as one volcanic island arc terrane before obducting onto Laurentian, Grenville age, continental crust in the Taconian orogeny [Rankin, D.W., 1994. Continental margin of the eastern United States: past and present. In: Speed, R.C., (Ed.), Phanerozoic Evolution of North American Continent-Ocean Transitions. DNAG Continent-Ocean Transect Volume. Geological Society of America, Boulder, Colorado, pp. 129-218]. Volcanic island-arc rocks of the Avalon terrane are in contact with Central Maine terrane rocks in southern Connecticut where the latter are overthrust onto the Brompton-Cameron terrane, which is thrust over Laurentian basement. Similarities of these allochthonous island arc terranes (Brompton-Cameron, Central Maine, Avalon) in lithology, fauna and age suggest that they are faulted segments of the margin of one major late Precambrian to early Paleozoic, high latitude peri-Gondwana island arc designated as "Avalonia", which collided with Laurentia in the early to middle Paleozoic. The Brompton Cameron, Central Maine, and Avalon terranes are projected as the basement under the eastern New Jersey Coastal Plain based on drill core samples of metamorphic rocks of active margin/magmatic arc origin. A seismic reflection profile across the New York Bight traces the gentle dipping (approximately 20 degrees) Cameron's Line Taconian suture southeast beneath allochthonous Avalon and other terranes to a 4 sec TWTT depth (approximately 9 km) where the Avalonian rocks are over Laurentian crust. Gentle up-plunge (approximately 5 degrees) projections to the southwest bring the Laurentian Grenville age basement and the drift-stage early Paleozoic cover rocks to windows in Burlington Co. at approximately 1 km depth and Cape May Co. at approximately 2 km depths. The antiformal Shellburne Falls and Chester domes and Chain Lakes-Pelham dome-Bronson Hill structural trends, and the synformal Connecticut Valley-Gaspe structural trend can be traced southwest into the New Jersey Coastal Plain basement. A Mesozoic rift basin, the "Sandy Hook basin", and associated eastern boundary fault is identified, based upon gravity modeling, in the vicinity of Sandy Hook, New Jersey. The thickness of the rift-basin sedimentary rocks contained within the "Sandy Hook basin" is approximately 4.7 km, with the basin extending offshore to the east of the New Jersey coast. Gravity modeling indicates a deep rift basin and the magnetic data indicates a shallow magnetic basement caused by magnetic diabase sills and/or basalt flows contained within the rift-basin sedimentary rocks. The igneous sills and/or flows may be the eastward continuation of the Watchung and Palisades bodies.
机译：使用地震，钻探，重力和磁数据构造了新泽西州沿海平原地下室的区域地形图。将Brompton-Cameron和Central Maine地层合并为一个火山岛弧状地层，然后才进入Taconian造山带中的Laurentian，Grenville年龄，大陆壳[Rankin，D.W.，1994。美国东部的大陆边缘：过去和现在。在：《速度》，R.C。，（编），北美大陆-海洋过渡的生代演化。 DNAG大陆-海洋样带量。美国地质学会，科罗拉多州博尔德，第129-218页]。阿瓦隆山脉的火山岛弧岩石与康涅狄格州南部的中央缅因州地形岩石相接触，后者被推覆到布伦普顿-卡梅伦地形上，并被推翻到劳伦底层。这些异源岛弧地层（Brompton-Cameron，缅因州中部，阿瓦隆）在岩性，动物群和年龄上的相似性表明，它们是前寒武纪晚期至古生代早期，高纬度冈瓦纳外围岛弧的主要断层段。 “ Avalonia”，在古生代初期至中期与Laurentia相撞。根据活动边缘/岩浆弧成因的变质岩的钻探岩心样本，预计将Brompton Cameron，中缅因州和Avalon地形作为新泽西东部沿海平原的地下室。穿过纽约湾的地震反射剖面图追踪了卡梅隆的Line Taconian缝线向东南倾斜的方向，在异质Avalon和其他地壳下方缓慢倾斜（约20度），达到4秒钟TWTT深度（约9 km），在那里Avalonian岩石覆盖了Laurentian地壳。向西南部的柔和上升（大约5度）投影使Laurentian Grenville年龄基底和漂移阶段的早古生代覆盖岩到达了Burlington Co.约1 km深度和May Cape Cape约2 km深度的窗口。反形式的Shellburne瀑布和切斯特穹顶以及Chain Lakes-Pelham穹顶-Bronson Hill结构趋势，以及康涅狄格州-Gaspe的同形共形结构趋势可以追溯到西南部至新泽西沿海平原基底。根据重力模型，在新泽西州桑迪胡克附近确定了中生代裂谷盆地“桑迪胡克盆地”以及相关的东部边界断层。 “桑迪胡克盆地”中所含的裂谷盆地沉积岩的厚度约为4.7公里，该盆地延伸至新泽西海岸以东的近海处。重力建模表明裂谷盆地较深，而磁数据表明裂谷盆地沉积岩中所含的辉绿岩基岩和/或玄武岩流所引起的浅层磁性基底。火成的基石和/或流动可能是Watchung和Palisades尸体向东的延续。

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