Extensional evolution of the central East Greenland Caledonides
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 2001. CDROM contains entire thesis in PDF format. CDROM copy of thesis held by MIT Institute Archives only. Includes bibliographical references. This thesis addresses the complexity of both s...
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ftmit:oai:dspace.mit.edu:1721.1/8233 2023-06-11T04:11:21+02:00 Extensional evolution of the central East Greenland Caledonides White, Arthur Percy, 1972- Kip V. Hodges. Massachusetts Institute of Technology. Dept. of Earth, Atmospheric, and Planetary Sciences. Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences 2001 301 p. 26523528 bytes 26523284 bytes application/pdf http://hdl.handle.net/1721.1/8233 eng eng Massachusetts Institute of Technology http://hdl.handle.net/1721.1/8233 50179772 M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 Earth Atmospheric and Planetary Sciences Thesis 2001 ftmit 2023-05-29T07:26:56Z Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 2001. CDROM contains entire thesis in PDF format. CDROM copy of thesis held by MIT Institute Archives only. Includes bibliographical references. This thesis addresses the complexity of both syn- and post-orogenic extension in the overriding plate during Caledonian continental collision through field and laboratory investigations in the central East Greenland Caledonides. During the course of this work, attempts were made to answer some of the outstanding regional and local questions in East Greenland geology. Structural, U-Pb and ⁴⁰Ar/³⁹Ar geochronologic, petrographic and thermobarometric data were combined to constrain and reconstruct a portion of the tectonic history of this orogen. Most extension was accommodated along a system of orogen-parallel, N-S striking normal faults known as the Fjord Region Detachment (FRD) system. The FRD system comprises two temporally distinct, but overlapping, splays just south of 73⁰ N. The lowermost splay is called the Hogedal detachment was active from ca. 417 to 380 Ma, and was active for a second time as recently as ca. 357 Ma. The uppermost splay is the Tindern detachment. This fault was active from ca. 425-423 Ma, exhuming material at rates as fast as 6.5 mm/year. Continued extension in the hanging-wall of this fault accounts for additional denudation at much slower rates over a 25 my time-period. In-between activity on these faults, there is evidence to suggest that middle-crustal thickening continued to occur. Thus, the East Greenland Caledonides preserve evidence for crustal thickening (minimum -16 km) and orogen parallel shear, followed by rapid upper-middle crustal thinning (-13 km), followed by coeval middle-crustal thickening (unknown amount) and upper-crustal thinning (5 km), and ending with crustal collapse (-16 km thinning). (cont.) This is the first time that an alternation between thrusting and normal faulting has been observed in an ... Thesis East Greenland Greenland DSpace@MIT (Massachusetts Institute of Technology) Greenland |
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Open Polar |
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DSpace@MIT (Massachusetts Institute of Technology) |
op_collection_id |
ftmit |
language |
English |
topic |
Earth Atmospheric and Planetary Sciences |
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Earth Atmospheric and Planetary Sciences White, Arthur Percy, 1972- Extensional evolution of the central East Greenland Caledonides |
topic_facet |
Earth Atmospheric and Planetary Sciences |
description |
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 2001. CDROM contains entire thesis in PDF format. CDROM copy of thesis held by MIT Institute Archives only. Includes bibliographical references. This thesis addresses the complexity of both syn- and post-orogenic extension in the overriding plate during Caledonian continental collision through field and laboratory investigations in the central East Greenland Caledonides. During the course of this work, attempts were made to answer some of the outstanding regional and local questions in East Greenland geology. Structural, U-Pb and ⁴⁰Ar/³⁹Ar geochronologic, petrographic and thermobarometric data were combined to constrain and reconstruct a portion of the tectonic history of this orogen. Most extension was accommodated along a system of orogen-parallel, N-S striking normal faults known as the Fjord Region Detachment (FRD) system. The FRD system comprises two temporally distinct, but overlapping, splays just south of 73⁰ N. The lowermost splay is called the Hogedal detachment was active from ca. 417 to 380 Ma, and was active for a second time as recently as ca. 357 Ma. The uppermost splay is the Tindern detachment. This fault was active from ca. 425-423 Ma, exhuming material at rates as fast as 6.5 mm/year. Continued extension in the hanging-wall of this fault accounts for additional denudation at much slower rates over a 25 my time-period. In-between activity on these faults, there is evidence to suggest that middle-crustal thickening continued to occur. Thus, the East Greenland Caledonides preserve evidence for crustal thickening (minimum -16 km) and orogen parallel shear, followed by rapid upper-middle crustal thinning (-13 km), followed by coeval middle-crustal thickening (unknown amount) and upper-crustal thinning (5 km), and ending with crustal collapse (-16 km thinning). (cont.) This is the first time that an alternation between thrusting and normal faulting has been observed in an ... |
author2 |
Kip V. Hodges. Massachusetts Institute of Technology. Dept. of Earth, Atmospheric, and Planetary Sciences. Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
format |
Thesis |
author |
White, Arthur Percy, 1972- |
author_facet |
White, Arthur Percy, 1972- |
author_sort |
White, Arthur Percy, 1972- |
title |
Extensional evolution of the central East Greenland Caledonides |
title_short |
Extensional evolution of the central East Greenland Caledonides |
title_full |
Extensional evolution of the central East Greenland Caledonides |
title_fullStr |
Extensional evolution of the central East Greenland Caledonides |
title_full_unstemmed |
Extensional evolution of the central East Greenland Caledonides |
title_sort |
extensional evolution of the central east greenland caledonides |
publisher |
Massachusetts Institute of Technology |
publishDate |
2001 |
url |
http://hdl.handle.net/1721.1/8233 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
East Greenland Greenland |
genre_facet |
East Greenland Greenland |
op_relation |
http://hdl.handle.net/1721.1/8233 50179772 |
op_rights |
M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 |
_version_ |
1768386335350980608 |