THERE AND BACK AGAIN: RECYCLING OF THE APPALACHIAN SIGNATURE IN DZ U-PB RECORDS OF PHANEROZOIC NORTH AMERICA

I. Allred, M. Blum, B. Frederick, Abdullah M. Wahbi
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Abstract

Continental-scale recycling of detrital zircon (DZ) grains and associated sediment across North American is not well understood. We trace a through line following the DZ proxy for the detritus originally sourced from Grenville and Appalachian orogens. This paper lays out an antecedent framework for one of the greatest sedimentation episodes of the Phanerozoic: the initial dispersal of Appalachian- and Grenville-age DZ grains to the western passive margin of Laurentia and the subsequent paleodrainage reorganization and sediment remobilization back to the east. The DZ U-Pb signature of the Appalachian-Ouachita orogenic system is dominated by Grenville (ca. 1250–950 Ma) and Appalachian (ca. 500–275 Ma) age groups and dominates the Phanerozoic record of North America. This study juxtaposes Pennsylvanian to modern DZ U-Pb data from across North America and demonstrates a persistent Appalachian signature, including a recycled Appalachian signature across Western North America. Lower Pennsylvanian deposits proximal to the Appalachian orogen are 50%–75% Appalachian- and Grenville-age DZ grains, representing the key component in the primary Appalachian signature. It remains unclear how the Appalachian signal was propagated to the west, but the Appalachian DZ signature was clearly present across the late Paleozoic passive margin of Laurentia and thus antecedent to potential DZ recycling throughout the Mesozoic and Cenozoic Eras. Triassic DZ samples document transcontinental fluvial systems that reached the western Laurentian margin, but subsequent Jurassic-Cretaceous samples indicate drainage reversal due to the rise of the Mesozoic Western Cordillera. A persistent Appalachian signature exists in these western-sourced, eastward-flowing systems—a phenomenon that continues to the present: samples are frequently composed of >40% Appalachian- and Grenville-age DZ. However, none of these systems are interpreted to be sourced by primary Appalachian or Grenville terranes, suggesting a recycled Appalachian signature. The persistent Appalachian signature, originally sourced by the linking of two orogenic terranes, continues to dominate the Phanerozoic record of much of North America to this day.
再来再来:在北美显生宙的dz u-pb记录中回收阿巴拉契亚特征
碎屑锆石(DZ)颗粒和伴生沉积物在北美大陆尺度上的再循环尚不清楚。我们追踪了一条贯穿线,沿着DZ代理的碎屑最初来自格伦维尔和阿巴拉契亚造山带。本文提出了显生宙最伟大的沉积时期之一的先行框架:阿巴拉契亚和格伦维尔时代的DZ颗粒最初扩散到劳伦西亚西部被动边缘,随后的古排水重组和沉积物再移动回到东部。Appalachian- ouachita造山系的DZ U-Pb特征以Grenville(约1250 ~ 950 Ma)和Appalachian(约500 ~ 275 Ma)两个年龄组为主,主导了北美显生宙记录。本研究将来自北美各地的宾夕法尼亚和现代DZ U-Pb数据并列,证明了持久的阿巴拉契亚特征,包括北美西部的阿巴拉契亚特征。近阿巴拉契亚造山带的宾夕法尼亚下沉积50%-75%为阿巴拉契亚和格伦维尔时代的DZ颗粒,是阿巴拉契亚原始特征的关键组成部分。目前尚不清楚Appalachian信号是如何向西传播的,但Appalachian DZ信号明显存在于Laurentia晚古生代的被动边缘,因此在整个中生代和新生代可能的DZ再循环之前。三叠纪DZ样品记录了横贯大陆的河流系统到达西劳伦边缘,但随后的侏罗纪-白垩纪样品表明,由于中生代西科迪勒拉的崛起,排水逆转。在这些来自西部、向东流动的体系中,存在着持久的阿巴拉契亚特征——这种现象一直持续到现在:样品通常由>40%的阿巴拉契亚和格伦维尔时代的DZ组成。然而,这些系统都没有被解释为来自主要的阿巴拉契亚或格伦维尔地区,这表明阿巴拉契亚地区的特征是再生的。持续存在的阿巴拉契亚特征,最初来源于两个造山带的连接,直到今天仍然主导着北美大部分显生宙的记录。
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