LiDAR and other evidence for the southwest continuation and Late Quaternary reactivation of the Norumbega Fault System and a cross-cutting structure near Biddeford, Maine, USA

IF 1.2 4区地球科学 Q2 GEOLOGY

Atlantic Geology Pub Date : 2019-10-28 DOI:10.4138/atlgeol.2019.011

R. Marple, J. Hurd

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引用次数: 2

Abstract

High-resolution LiDAR (light detection and ranging) images reveal numerous NE-SW-trending geomorphic lineaments that may represent the southwest continuation of the Norumbega fault system (NFS) along a broad, 30- to 50-km-wide zone of brittle faults that continues at least 100 km across southern Maine and southeastern New Hampshire. These lineaments are characterized by linear depressions and valleys, linear drainage patterns, abrupt bends in rivers, and linear scarps. The Nonesuch River, South Portland, and Mackworth faults of the NFS appear to continue up to 100 km southwest of the Saco River along prominent but discontinuous LiDAR lineaments. Southeast-facing scarps that cross drumlins along some of the lineaments in southern Maine suggest that late Quaternary displacements have occurred along these lineaments. Several NW-SE-trending geomorphic features and geophysical lineaments near Biddeford, Maine, may represent a 30-km-long, NW-SE-trending structure that crosses part of the NFS. Brittle NWSE-trending, pre-Triassic faults in the Kittery Formation at Biddeford Pool, Maine, support this hypothesis.

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美国缅因州Biddeford附近Norumbega断层系统和横切结构西南延续和晚第四纪复活的LiDAR和其他证据

高分辨率激光雷达（光探测和测距）图像揭示了许多NE-SW走向的地貌线理，这些地貌线理可能代表了Norumbega断层系统（NFS）沿30至50公里宽的脆性断层带的西南延续，该断层带在缅因州南部和新罕布什尔州东南部持续至少100公里。这些线性构造以线性凹陷和山谷、线性排水模式、河流急转弯和线性陡崖为特征。NFS的Nonesuch河、South Portland和Mackworth断层似乎沿着突出但不连续的激光雷达线理在萨科河西南方向延伸了100公里。沿着缅因州南部的一些线性构造穿过鼓点的东南向陡崖表明，这些线性构造发生了晚第四纪的位移。缅因州Biddeford附近的几个西北-东南走向地貌特征和地球物理线理可能代表一个30公里长的西北-东南方向结构，该结构穿过NFS的一部分。缅因州Biddeford Pool Kittery组的脆性NWSE走向、三叠纪前断层支持了这一假设。

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来源期刊

Atlantic Geology GEOLOGY-

CiteScore

2.10

自引率

18.80%

发文量

审稿时长

>12 weeks

期刊介绍： Atlantic Geology (originally Maritime Sediments, subsequently Maritime Sediments and Atlantic Geology) covers all aspects of the geology of the North Atlantic region. It publishes papers, notes, and discussions on original research and review papers, where appropriate to the regional geology.