Anticlockwise metamorphic pressure–temperature paths and nappe stacking in the Reisa Nappe Complex in the Scandinavian Caledonides, northern Norway: evidence for weakening of lower continental crust before and during continental collision

Faber, Carly; Stünitz, Holger; Gasser, Deta; Jeřábek, Petr; Kraus, Katrin; Corfu, Fernando; Ravna, Erling K.; Konopásek, Jiří

doi:https://doi.org/10.5194/se-10-117-2019

Articles | Volume 10, issue 1

https://doi.org/10.5194/se-10-117-2019

© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/se-10-117-2019

© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 10, issue 1

Research article

|

17 Jan 2019

Research article |

| 17 Jan 2019

Anticlockwise metamorphic pressure–temperature paths and nappe stacking in the Reisa Nappe Complex in the Scandinavian Caledonides, northern Norway: evidence for weakening of lower continental crust before and during continental collision

Carly Faber, Holger Stünitz, Deta Gasser, Petr Jeřábek, Katrin Kraus, Fernando Corfu, Erling K. Ravna, and Jiří Konopásek

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Final revised paper (published on 17 Jan 2019)
Supplement to the final revised paper
Preprint (discussion started on 31 Jul 2018)
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Interactive discussion

Status: closed

AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

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RC1: 'Revie and comments:', Torgeir B. Andersen, 10 Aug 2018
- AC1: 'Response to referee comment by T.B. Andersen', Carly Faber, 20 Nov 2018
RC2: 'review faber et al.', Thorsten Nagel, 23 Oct 2018
- AC2: 'Response to referee comment by T. Nagel', Carly Faber, 27 Nov 2018

Peer-review completion

AR: Author's response | RR: Referee report | ED: Editor decision

AR by Carly Faber on behalf of the Authors (06 Dec 2018) Author's response Manuscript

ED: Publish subject to minor revisions (review by editor) (13 Dec 2018) by Federico Rossetti

Dear Authors,
based on the reviewer's report and the overall assessment of the review process, your revised manuscript can be accepted for publication in Solid Earth, pending the minor revisions (mostly editing issues) as detailed below.

As a general remarks
(i) when referring to a regional tectonic event you are referring to deformation/metamorphism stage/s that include(s) not only tectonic foliation (S tectonites) but likely also a lineation (S-L tectonites). Maybe more appropriate to replace "S" with "D" when dealing with tectonic episodes;
(ii) the error bars for ages and P-T estimates should be taken into consideration when presenting these data in the text (abstract, main text and Conclusions). In the text is written that errors for P-T are +/- 50 °C and +/- 1 kbar and this should be taken into consideration when presenting the thermo-baric conditions. The error bars for ages vary from +/- 1 to +/- 6 Ma. This is consistent with what presented in Figure 15, where the tectonic reconstruction is presented for time lapses of 5 Ma. Text should be revised accordingly (see also specific comments below);
(iii) editing: "S1" and "S2" with "1" and "2" as subscript.

Below some specific points that regards only the Abstract and Conclusions, but these issues should be fixed in the entire manuscript;

Abstract
line 19: "S1", "1" as subscript, here and throughtout the ms. + add "foliation" after "S1"
line 19: "S2", "2" as subscript, here and throughtout the ms. + add "foliation" after "S2"
line 19: "At 439 Ma", please indicate the error bar for the age or better to change with "At ca. 440 Ma"
line 20: "9-11.4 kbar", decimal approximation for pressure estimates; which the error bar? maybe better to substitute with " 9-11 kbar"
line 21 (same as above, the P-T range), "(590 – 610 °C, 5.5-6.8 kbar)", maybe better "ca. 600 °C and 6-7 kbar".
line 23 & 24: please correct the provided P-T range
line 25: "440 and 427 Ma", which the error bar for the ages? "440-425 Ma"

Conclusions (pg. 41)
line 20 & 21: "443-435 Ma" "~437-427 Ma", which the error bar for the ages?

Looking forward to receiving a suitable revised version soon,

sincerely,
federico rossetti

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AR by Carly Faber on behalf of the Authors (16 Dec 2018) Author's response Manuscript

ED: Publish as is (17 Dec 2018) by Federico Rossetti

ED: Publish as is (17 Dec 2018) by Federico Rossetti (Executive editor)

AR by Carly Faber on behalf of the Authors (21 Dec 2018)

Short summary

The Caledonian mountains formed when Baltica and Laurentia collided around 450–400 million years ago. This work describes the history of the rocks and the dynamics of that continental collision through space and time using field mapping, estimated pressures and temperatures, and age dating on rocks from northern Norway. The rocks preserve continental collision between 440–430 million years ago, and an unusual pressure–temperature evolution suggests unusual tectonic activity prior to collision.