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Structural Analysis and Slip Kinematics of the Keweenaw Fault System Between Bete Grise Bay and Gratiot Lake, Keweenaw County, Michigan.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Structural Analysis and Slip Kinematics of the Keweenaw Fault System Between Bete Grise Bay and Gratiot Lake, Keweenaw County, Michigan./
Author:	Lizzadro-McPherson, Daniel J.
Description:	1 online resource (152 pages)
Notes:	Source: Masters Abstracts International, Volume: 84-11.
Contained By:	Masters Abstracts International84-11.
Subject:	Geology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30420118click for full text (PQDT)
ISBN:	9798379554989

Structural Analysis and Slip Kinematics of the Keweenaw Fault System Between Bete Grise Bay and Gratiot Lake, Keweenaw County, Michigan.
Lizzadro-McPherson, Daniel J.

Structural Analysis and Slip Kinematics of the Keweenaw Fault System Between Bete Grise Bay and Gratiot Lake, Keweenaw County, Michigan. - 1 online resource (152 pages)

Source: Masters Abstracts International, Volume: 84-11.

Thesis (M.S.)--Michigan Technological University, 2023.

Includes bibliographical references

The Keweenaw fault is perhaps the most significant geologic structure on the Keweenaw Peninsula, with an estimated 7-11 km of reverse slip juxtaposing volcanic strata of the ~1.1 Ga Portage Lake Volcanics above ~1.0 Ga Jacobsville Sandstone. The fault has been interpreted as a rift-bounding normal fault later inverted by compressional pulses of the Grenville Orogeny or, more recently, as part of a detached thrust fault system unrelated to an earlier normal fault. The fault is shown on published maps as a single continuous fault trace whose sinuosity implies multiple fault segments and complex slip dynamics. Mapping along Bete Grise Bay in 2017-2018 revealed that the Keweenaw fault at the east-most exposure on land is better characterized as a network of interconnected, left-stepping fault segments with easterly strike and exhibiting a 2:1 ratio of dextral strike-slip to reverse-slip. Mapping west from Bete Grise Bay to Mohawk, MI in 2019-2020 as part of the USGS EDMAP program focused on constraining the geometry and slip kinematics of this adjacent portion of the Keweenaw fault system.This thesis project focused on the eastern half of the 2019-2020 project area and mapped the Keweenaw fault system between Bete Grise Bay and Gratiot Lake. The new mapping and structural measurements have produced an updated bedrock geology map and cross-sections that better constrain the three-dimensional geometry of the fault system and reveal folds and fault-bounded blocks in the fault's footwall. Three directional fault sets were identified and interpreted in the study area: 1) ENE-striking faults with steep northerly dips; 2) ESE-striking faults with steep northerly dips; and 3) NNE-striking faults with shallow to moderate westerly dips, connecting Set 2 faults to Set 1 faults. Inferred layer-parallel detachment faulting along Portage Lake Volcanic sedimentary units is modeled in cross-sections and constrained by locally dense surface control and by subsurface diamond drill hole logs. Analyses of fault slip measurements indicates an overall strike-to-dip slip ratio of 1.7:1 and tectonic shortening in a direction 083°-263°. The strike-to-dip slip ratio of each directional fault set is inferred to vary as a function of its strike relative to the shortening direction.Fault-bounded blocks were transported eastward along Set 1 and Set 2 strike-slip faults, which movement was probably facilitated by layer-parallel detachments and Set 3 thrusts that ramp up towards the east on the block's leading edge. The three fault sets with a combination of dextral strike slip and reverse dip slip define a multistranded transpressional network of fault segments. These findings are consistent with the other studies correlating far-field compressive pulses of the Grenville Orogeny to Keweenaw fault slip events.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798379554989Subjects--Topical Terms:

516570
Geology.
Subjects--Index Terms:

Fault kinematicsIndex Terms--Genre/Form:

542853
Electronic books.

Structural Analysis and Slip Kinematics of the Keweenaw Fault System Between Bete Grise Bay and Gratiot Lake, Keweenaw County, Michigan.
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245 1 0 $a Structural Analysis and Slip Kinematics of the Keweenaw Fault System Between Bete Grise Bay and Gratiot Lake, Keweenaw County, Michigan.
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300 $a 1 online resource (152 pages)
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500 $a Source: Masters Abstracts International, Volume: 84-11.
500 $a Advisor: DeGraff, James M.
502 $a Thesis (M.S.)--Michigan Technological University, 2023.
504 $a Includes bibliographical references
520 $a The Keweenaw fault is perhaps the most significant geologic structure on the Keweenaw Peninsula, with an estimated 7-11 km of reverse slip juxtaposing volcanic strata of the ~1.1 Ga Portage Lake Volcanics above ~1.0 Ga Jacobsville Sandstone. The fault has been interpreted as a rift-bounding normal fault later inverted by compressional pulses of the Grenville Orogeny or, more recently, as part of a detached thrust fault system unrelated to an earlier normal fault. The fault is shown on published maps as a single continuous fault trace whose sinuosity implies multiple fault segments and complex slip dynamics. Mapping along Bete Grise Bay in 2017-2018 revealed that the Keweenaw fault at the east-most exposure on land is better characterized as a network of interconnected, left-stepping fault segments with easterly strike and exhibiting a 2:1 ratio of dextral strike-slip to reverse-slip. Mapping west from Bete Grise Bay to Mohawk, MI in 2019-2020 as part of the USGS EDMAP program focused on constraining the geometry and slip kinematics of this adjacent portion of the Keweenaw fault system.This thesis project focused on the eastern half of the 2019-2020 project area and mapped the Keweenaw fault system between Bete Grise Bay and Gratiot Lake. The new mapping and structural measurements have produced an updated bedrock geology map and cross-sections that better constrain the three-dimensional geometry of the fault system and reveal folds and fault-bounded blocks in the fault's footwall. Three directional fault sets were identified and interpreted in the study area: 1) ENE-striking faults with steep northerly dips; 2) ESE-striking faults with steep northerly dips; and 3) NNE-striking faults with shallow to moderate westerly dips, connecting Set 2 faults to Set 1 faults. Inferred layer-parallel detachment faulting along Portage Lake Volcanic sedimentary units is modeled in cross-sections and constrained by locally dense surface control and by subsurface diamond drill hole logs. Analyses of fault slip measurements indicates an overall strike-to-dip slip ratio of 1.7:1 and tectonic shortening in a direction 083°-263°. The strike-to-dip slip ratio of each directional fault set is inferred to vary as a function of its strike relative to the shortening direction.Fault-bounded blocks were transported eastward along Set 1 and Set 2 strike-slip faults, which movement was probably facilitated by layer-parallel detachments and Set 3 thrusts that ramp up towards the east on the block's leading edge. The three fault sets with a combination of dextral strike slip and reverse dip slip define a multistranded transpressional network of fault segments. These findings are consistent with the other studies correlating far-field compressive pulses of the Grenville Orogeny to Keweenaw fault slip events.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
650 4 $a Geology. $3 516570
650 4 $a Geographic information science. $3 3432445
653 $a Fault kinematics
653 $a Jacobsville Sandstone
653 $a Keweenaw fault
653 $a Keweenaw geology
653 $a Portage Lake Volcanics
653 $a Structural Geologic Mapping
655 7 $a Electronic books. $2 lcsh $3 542853
690 $a 0372
690 $a 0370
710 2 $a ProQuest Information and Learning Co. $3 783688
710 2 $a Michigan Technological University. $b Geological/Mining Engineering & Sciences. $3 1019568
773 0 $t Masters Abstracts International $g 84-11.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30420118 $z click for full text (PQDT)