Torvela, TM orcid.org/0000-0003-1539-8755 (2017) How (not) to recognize a mid-crustal channel from outcrop patterns. In: Law, RD, Thigpen, JR, Merschat, AJ and Stowell, HH, (eds.) Linkages and Feedbacks in Orogenic Systems. The Geological Society of America Memoirs, 213 (213). Geographical Society of America , pp. 129-148. ISBN 9780813782133
Abstract
Mid-crustal channel flow has been hypothesised to be responsible both for the Greater and Lesser Himalayan Sequences (the Miocene Himalayan channel theory), and for the present east- and northward movement and extension of the Tibetan upper crust (the Tibetan middle crustal channel flow theory). As processes within the crust cannot be directly observed, various studies have attempted to validate mid-crustal channel flow by using indirect approaches, including outcrop patterns and other field data from Himalayas, Tibet, and exposed older orogenic roots. The results have been highly debated because arguments can be made that the internal structure of a channel and, therefore, the outcrop patterns of a palaeo-mid-crustal channel are not unique. This paper investigates what types of structural patterns may be produced within a mid-crustal channel, and discusses why they can be difficult, if not impossible, to distinguish from outcrop patterns produced by other mechanisms. A new example from the exposed middle crust of southern Finland is also discussed in this context. While outcrop structural patterns must indeed agree with other potential results that may infer a mid-crustal channel, the inverse is not necessarily true: one cannot infer a mid-crustal channel based on outcrop patterns alone, due to the non-unique nature of the patterns.
Metadata
Item Type: | Book Section |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2017 The Geological Society of America. This is an author produced version of a chapter published in Linkages and Feedbacks in Orogenic Systems. Uploaded in accordance with the publisher's self-archiving policy. |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Institute for Applied Geosciences (IAG) (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 22 Jun 2017 15:25 |
Last Modified: | 11 Sep 2018 00:38 |
Status: | Published |
Publisher: | Geographical Society of America |
Series Name: | The Geological Society of America Memoirs |
Identification Number: | 10.1130/MEM213 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:92945 |