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Title: Faulting in Atlantic Coastal Plain sediments at the Savannah River Site, SC: Interpretations from seismic reflection time maps

Abstract

Time-structure, isochron, and reflection amplitude maps were constructed from 270 km of reprocessed seismic reflection data recorded at the Savannah river Site (SRS), South Carolina. These maps indicate the presence of three major basement blocks bounded by northeast trending faults that penetrate upward from basement into the Atlantic coastal Plain sediments. Most of these faults appear to be Paleozoic and Mesozoic structures reactivated in compression. The northernmost fault block is bounded on the southeast by the Upper Tree Runs fault (UTRF), a high-angle southeast dipping reverse fault, which appears to be a reactivated splay from a major decollement (Augusta fault ) at 5 km depth. The Pen Branch fault (PBF) is the main throughgoing fault in a 3 km wide, 25 km long, fault zone consisting of subparallel fault segments that are commonly down-to-the-northwest north of PBF and down-to-the-southeast south of PBF. The offset of time horizons by PBF increases to the northeast and the shallowest resolvable time horizons appear to be deformed across its length. The Steel Creek fault, an antithetic fault to PBF, controls the drainage of Pen Branch, a tributary stream to the Savannah River. The third fault block is bounded by the Pen Branch fault onmore » the northwest. The southeast boundary of this southernmost block is unknown, but could be defined by the Martin fault, a down-to-the-southeast fault located south of SRS that appears to be a major structure. Interpretation of isochron maps and analysis of trend surfaces fitted to reflection time horizons suggest that faulting was ongoing through the Late Cretaceous and was accompanied by tilting of the fault blocks, possibly associated with the transfer of strain from the UTRF to the PBF.« less

Authors:
; ;  [1];  [2]
  1. Virginia Polytechnic Inst. and State Univ., Blacksburg, VA (United States). Dept. of Geological Sciences
  2. Westinghouse Savannah River Co., Aiken, SC (United States)
Publication Date:
OSTI Identifier:
7059290
Report Number(s):
CONF-9404221-
Journal ID: ISSN 0016-7592; CODEN: GAAPBC
Resource Type:
Conference
Journal Name:
Geological Society of America, Abstracts with Programs; (United States)
Additional Journal Information:
Journal Volume: 26:4; Conference: 43. annual meeting of the Southeastern Section of the Geological Society of America, Blacksburg, VA (United States), 7-8 Apr 1994; Journal ID: ISSN 0016-7592
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; 22 GENERAL STUDIES OF NUCLEAR REACTORS; 54 ENVIRONMENTAL SCIENCES; GEOLOGIC FAULTS; SEISMIC SURVEYS; SAVANNAH RIVER PLANT; SITE CHARACTERIZATION; DATA ANALYSIS; SOUTH CAROLINA; DEVELOPED COUNTRIES; GEOLOGIC FRACTURES; GEOLOGIC STRUCTURES; GEOPHYSICAL SURVEYS; NATIONAL ORGANIZATIONS; NORTH AMERICA; SURVEYS; US AEC; US DOE; US ERDA; US ORGANIZATIONS; USA; 580000* - Geosciences; 220501 - Nuclear Reactor Technology- Environmental Aspects- Siting; 540250 - Environment, Terrestrial- Site Resource & Use Studies- (1990-)

Citation Formats

Domoracki, W J, Coruh, C, Costain, J K, and Stephenson, D E. Faulting in Atlantic Coastal Plain sediments at the Savannah River Site, SC: Interpretations from seismic reflection time maps. United States: N. p., 1994. Web.
Domoracki, W J, Coruh, C, Costain, J K, & Stephenson, D E. Faulting in Atlantic Coastal Plain sediments at the Savannah River Site, SC: Interpretations from seismic reflection time maps. United States.
Domoracki, W J, Coruh, C, Costain, J K, and Stephenson, D E. Tue . "Faulting in Atlantic Coastal Plain sediments at the Savannah River Site, SC: Interpretations from seismic reflection time maps". United States.
@article{osti_7059290,
title = {Faulting in Atlantic Coastal Plain sediments at the Savannah River Site, SC: Interpretations from seismic reflection time maps},
author = {Domoracki, W J and Coruh, C and Costain, J K and Stephenson, D E},
abstractNote = {Time-structure, isochron, and reflection amplitude maps were constructed from 270 km of reprocessed seismic reflection data recorded at the Savannah river Site (SRS), South Carolina. These maps indicate the presence of three major basement blocks bounded by northeast trending faults that penetrate upward from basement into the Atlantic coastal Plain sediments. Most of these faults appear to be Paleozoic and Mesozoic structures reactivated in compression. The northernmost fault block is bounded on the southeast by the Upper Tree Runs fault (UTRF), a high-angle southeast dipping reverse fault, which appears to be a reactivated splay from a major decollement (Augusta fault ) at 5 km depth. The Pen Branch fault (PBF) is the main throughgoing fault in a 3 km wide, 25 km long, fault zone consisting of subparallel fault segments that are commonly down-to-the-northwest north of PBF and down-to-the-southeast south of PBF. The offset of time horizons by PBF increases to the northeast and the shallowest resolvable time horizons appear to be deformed across its length. The Steel Creek fault, an antithetic fault to PBF, controls the drainage of Pen Branch, a tributary stream to the Savannah River. The third fault block is bounded by the Pen Branch fault on the northwest. The southeast boundary of this southernmost block is unknown, but could be defined by the Martin fault, a down-to-the-southeast fault located south of SRS that appears to be a major structure. Interpretation of isochron maps and analysis of trend surfaces fitted to reflection time horizons suggest that faulting was ongoing through the Late Cretaceous and was accompanied by tilting of the fault blocks, possibly associated with the transfer of strain from the UTRF to the PBF.},
doi = {},
url = {https://www.osti.gov/biblio/7059290}, journal = {Geological Society of America, Abstracts with Programs; (United States)},
issn = {0016-7592},
number = ,
volume = 26:4,
place = {United States},
year = {1994},
month = {3}
}

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