Supplementary files for: Petrology of the Skaergaard Layered Series

Version 2.0
Supplementary files for: Petrology of the Skaergaard Layered Series
Thy, Peter; Tegner, Christian; Lesher, Charles E., 2023, "Supplementary files for: Petrology of the Skaergaard Layered Series", https://doi.org/10.22008/FK2/UTFJP4, GEUS Dataverse, V2
Learn about Data Citation Standards.
Contact Owner Share
Dataset Metrics
4,912 Downloads
Description
The Skaergaard intrusion is a layered, ferrobasaltic intrusion emplaced during the Early Eocene into the rifting volcanic margin of East Greenland. The magma chamber crystallised in response to cooling from the roof and margins upwards and inward, forming upper, marginal and bottom series, the latter referred to as the Layered Series. The phase layering in the bottom series suggests an evolved, olivine-normative tholeiitic melt saturated in plagioclase and olivine, followed by augite, and then simultaneously by ilmenite and magnetite forming primocrysts. Pigeonite appears in the lower parts and continues until the centre of the series. Apatite appears in the upper part concurrently with liquid immiscibility. Cryptic variations of the individual primocrysts record a systematic upward increase in iron and decrease in magnesium for the mafic minerals and a systematic increase in sodium and decrease in calcium for plagioclase. The appearance of pigeonite is caused by reactions and crystallisation in the trapped melt and by subsolidus adjustments without this phase reaching liquidus saturation. The high mode of olivine at the base of the upper part with the appearance of apatite is interpreted to mark the onset of liquid immiscibility. This may have led to the separation of conjugate melts with granophyre migrating upward and the basic component largely staying stationary or sinking. Petrologic and geochemical observations indicate differentiation in the lower part of the intrusion, principally controlled by crystal fractionation with the efficiency of fractionation controlled by the evolution and escape of liquid from the solidifying mush. During the final stages of solidification, the onset of liquid immiscibility and termination of melt convection impeded differentiation. Modelling by perfect Rayleigh fractionation shows that major and included trace elements conform reasonably to observations, while excluded elements deviate from model predictions. This decoupling is caused by the mobility of a granophyre component formed in the trapped melt and in the main residual magma chamber. Consequently, the sampled gabbros may not be representative of the final solid-melt mush. By restoring the gabbros to their original mush compositions, it is possible to constrain granophyre migration pathways. We suggest that the granophyre formed in the trapped melt in the lower part of the intrusion mostly migrated laterally through pressure release pathways to form lenses and pockets with only limited upward migration into the main magma reservoir. Near the end stage of differentiation, the residual magma exsolved and formed complex mixtures of ferrobasaltic and granophyric melts. Estimates predict that a substantial amount of the granophyric melt penetrated as sills into the downward crystallising, upper part of the body as well as into the host rocks. The redistribution of granophyric melts within the solidifying crystal mush complicates predictions of trapped-melt content and mass-balance calculations but helps to explain apparent decoupling of included and excluded trace elements, especially towards the end stages of evolution. Final crystallisation was controlled mostly by in situ crystallisation leaving complex mixtures of ferrodiorite and granophyre components.
Subject Earth and Environmental Sciences
Related Publication Thy et al. 2023: Petrology of the Skaergaard Layered Series. GEUS Bulletin 56. doi: 10.34194/geusb.v56.8327
License/Data Use Agreement

Custom Dataset Terms

Table
Tree
Filter by
1 to 10 of 223 Files
SKG73_3407.jpg
S8-Aerial-photos/jpeg-images/JPEG Image - 41.3 MB
Published Feb 8, 2024
11 Downloads
MD5: 41e03e0271b3376babe18705660d1b0a
Stereoscopic aerial colour photo (1:27 000).
SKG73_3406.jpg
S8-Aerial-photos/jpeg-images/JPEG Image - 40.2 MB
Published Feb 8, 2024
11 Downloads
MD5: 04abde8eadb23d3942d91c7103db828c
Stereoscopic aerial colour photo (1:27 000).
SKG73_3405.jpg
S8-Aerial-photos/jpeg-images/JPEG Image - 41.1 MB
Published Feb 8, 2024
11 Downloads
MD5: aa4e156d54e83f0faae5790823510f58
Stereoscopic aerial colour photo (1:27 000).
SKG73_3403.jpg
S8-Aerial-photos/jpeg-images/JPEG Image - 37.9 MB
Published Feb 8, 2024
11 Downloads
MD5: c9a9dfdd0a4ea6437b93668a4ca8649c
Stereoscopic aerial colour photo (1:27 000).
SKG73_3402.jpg
S8-Aerial-photos/jpeg-images/JPEG Image - 40.9 MB
Published Feb 8, 2024
11 Downloads
MD5: 0fe3e833528ba503b89399d83afe3deb
Stereoscopic aerial colour photo (1:27 000).
SKG73_3314.jpg
S8-Aerial-photos/jpeg-images/JPEG Image - 58.4 MB
Published Feb 8, 2024
11 Downloads
MD5: 4cbbc13f2aab0c7d8d9351cd22e992d9
Stereoscopic aerial colour photo (1:27 000).
SKG73_3313.jpg
S8-Aerial-photos/jpeg-images/JPEG Image - 55.1 MB
Published Feb 8, 2024
14 Downloads
MD5: 95ff7bc91633296a44a5a6e0b55bc6f3
Stereoscopic aerial colour photo (1:27 000).
SKG73_3312.jpg
S8-Aerial-photos/jpeg-images/JPEG Image - 52.5 MB
Published Feb 8, 2024
14 Downloads
MD5: 2aba51d96a924cfdf536ea06001efc07
Stereoscopic aerial colour photo (1:27 000).
SKG73_3311.jpg
S8-Aerial-photos/jpeg-images/JPEG Image - 49.3 MB
Published Feb 8, 2024
14 Downloads
MD5: 0b743b592c29000b5fada2ede40a8f0b
Stereoscopic aerial colour photo (1:27 000).
SKG73_3310.jpg
S8-Aerial-photos/jpeg-images/JPEG Image - 113.7 MB
Published Feb 8, 2024
14 Downloads
MD5: 00efa997d5f86cced3466faaa0100473
Stereoscopic aerial colour photo (1:27 000).
Edit File

This file has already been deleted (or replaced) in the current version. It may not be edited.

Restrict Access

Restricting limits access to published files. People who want to use the restricted files can request access by default. If you disable request access, you must add information about access to the Terms of Access field.

Learn about restricting files and dataset access in the User Guide.

Enable access request
You must enable request access or add terms of access to restrict file access.
Save Changes
Edit Embargo

The selected file or files have already been published. Contact an administrator to change the embargo date or reason of the file or files.
Delete Files

The file will be deleted after you click on the Delete button.

Files will not be removed from previously published versions of the dataset.

Select File(s)

Please select one or more files.

Share Dataset

Share this dataset on your favorite social media networks.

Dataset Citations

Citations for this dataset are retrieved from Crossref via DataCite using Make Data Count standards. For more information about dataset metrics, please refer to the User Guide.

Sorry, no citations were found.
Restricted Files Selected

The selected file(s) may not be downloaded because you have not been granted access.

Download Options

The files selected are too large to download as a ZIP.

You can select individual files that are below the 16.0 GB download limit from the files table, or use the Data Access API for programmatic access to the files.

Select File(s)

Please select a file or files to be downloaded.

Restricted Files Selected

The restricted file(s) selected may not be downloaded because you have not been granted access.

Click Continue to download the files you have access to download.

Delete Dataset

Are you sure you want to delete this dataset and all of its files? You cannot undelete this dataset.

Delete Draft Version

Are you sure you want to delete this draft version? Files will be reverted to the most recently published version. You cannot undelete this draft.

Unpublished Dataset Private URL

Private URL can only be used with unpublished versions of datasets.

Unpublished Dataset Private URL

Are you sure you want to disable the Private URL? If you have shared the Private URL with others they will no longer be able to use it to access your unpublished dataset.

Delete Files

The file(s) will be deleted after you click on the Delete button.

Files will not be removed from previously published versions of the dataset.

Compute

This dataset contains restricted files you may not compute on because you have not been granted access.

Deaccession Dataset

Are you sure you want to deaccession? The selected version(s) will no longer be viewable by the public.

Deaccession Dataset

Are you sure you want to deaccession this dataset? It will no longer be viewable by the public.

Version Differences Details

Please select two versions to view the differences.

Version Differences Details
 
Version:
Last Updated:
Version:
Last Updated:
Select File(s)

Please select a file or files for access request.

Select File(s)

Embargoed files cannot be accessed. Please select an unembargoed file or files for your access request.

Edit Tags

Select existing file tags or create new tags to describe your files. Each file can have more than one tag.

Request Access

  You need to Log In to request access.

Dataset Terms

This dataset is made available under the following terms. Please confirm and/or complete the information needed below in order to continue.

Our Community Norms as well as good scientific practices expect that proper credit is given via citation. Please use the data citation shown on the dataset page.

Custom Dataset Terms — the following Custom Dataset Terms have been defined for this dataset.

Files S1, S2, S3, S4, S8 and S9 are published here under a standard CC-BY 4.0 licence (https://creativecommons.org/licenses/by/4.0/) permitting free redistribution and reproduction for any purpose, even commercial, provided proper citation of the original work. Copyright: the Author(s) of the associated paper, Peter Thy, Christian Tegner and Charles E Lesher. The maps displayed in Files S5, S6 and S7 have custom terms of use and various copyright holders. Further re-use of the maps displayed in these files requires permission from the sources (copyright holders) listed in those files.
The maps displayed in Files S5, S6 and S7 have custom terms of use and various copyright holders. Further re-use of the maps displayed in these files requires permission from the sources (copyright holders) listed in those files.
Preview Guestbook

Upon downloading files the guestbook asks for the following information.

Account Information

Package File Download

Use the Download URL in a Wget command or a download manager to download this package file. Download via web browser is not recommended. User Guide - Downloading a Dataverse Package via URL

https://dataverse.geus.dk/api/access/datafile/

Request Access

Please confirm and/or complete the information needed below in order to request access to files in this dataset.

The authors have permission to publish the following files here as part of supplementary material to their monograph. Permission to further re-use the original files should be sort from the copyright holders as provided here and in Files S5, S6, S7 and S8:

File S5-1: The rights to the 1930-1953 Wager sample locality map belong to the Oxford University Museum of Natural History. The map is part of their Lawrence Rickard Wager Collection (M.113). Used here with permission from Oxford University Museum of Natural History.

File S5-2: The McBirney Skaergaard sample locality map is shown with permission from the A.R. McBirney estate and family. The original map is now at the American Museum of Natural History in New York as part of their A.R. McBirney Skaergaard sample collection.

File S6-1: The Wager and Deer geological map is here shown by permission of the Wager family. The map was originally published in the series Meddelelser om Grønland in 1939 (Volume 105, Number 4) and reprinted in 1962. The Museum Tusculanum Press, University of Copenhagen released in 2010 a facsimile edition of Wager and Deer’s original monograph (the 1962 reprint edition) that contained a size reduced and grey scale copy of the original geological map.

File S6-2: The rights to the 1961 W.A. Deer map of the Skaergaard intrusion belong to the Sedgwick Museum of Earth Sciences, University of Cambridge. It is part of their W.A. Deer Archives (DEER DDF Archive 219c). Available here with their permission.

File S6-3: The 1967 Geological Map of the Skaergaard Intrusion was included as Plate XI (facing page 244) in Layered Igneous Rocks published in 1967 by W.H. Freeman and Company in San Francisco. The same book and map, also authored by L.R. Wager and G.M. Brown, was in 1968 published by Oliver & Boyd of Edinburgh. Both publishers have today ceased to operate and their titles were taken over, respectively, by McMillian Education and Longman-Pearson. However, the copyright to the text of the book and the geological map is retained the authors and their descendants. The geological map is here shown by permission of the Wager family.

File S6-4: The McBirney Skaergaard map (1989 edition) is shown with permission from the A.R. McBirney estate and family.

File S7-1: GI 1937 topographic map (1:250 000). The original file and map metadata is available from “Historiske Kort” at https://historiskekort.dk provided by the Agency for Data Supply and Infrastructure (SDFI) in Denmark. A summary of this map is included in this set of Supplementary Files under a CC-BY-4.0 license according to the guidelines for free geographical data at https://historiskekort.dk (and https://sdfi.dk/om-os/vilkaar-og-priser in Danish only). The responsible agency for permission for further re-use of this material is SDFI. Map ID from Historiske Kort: Kangerdlugssuaq G250_68_o3_1937.jpg 1937

File S7-2: GI 1969 topographic map (1:250 000) This map is published online at “Historiske Kort” at https://historiskekort.dk provided by the Agency for Data Supply and Infrastructure (SDFI) in Denmark. A link to this map is included in this set of Supplementary Files under a CC-BY-4.0 license according to the guidelines for free geographical data at https://historiskekort.dk (and https://sdfi.dk/om-os/vilkaar-og-priser in Danish only). The responsible agency for access and permission for further re-use of this material is SDFI. Map ID: Kangerdlugssuaq G250_68_o3_1969.jpg 1969

File S7-3: GI 1975 Skaergaard Topographic Map (1:20 000). Map file is published online at The Greenland Mineral Resources Portal and available to download here: https://data.geus.dk/greenlanddb/ViewMap.xhtml?mapMapId=2023

File S7-4: GI 1982 topographic map (1:250 000). A version of this map (1.1.1) is published online at “Historiske Kort” at https://historiskekort.dk provided by the Agency for Data Supply and Infrastructure (SDFI) in Denmark. A link to this map is included in this set of Supplementary Files under a CC-BY-4.0 license according to the guidelines for free geographical data at https://historiskekort.dk (and https://sdfi.dk/om-os/vilkaar-og-priser in Danish only). The responsible agency for access and permission for further re-use of this material is SDFI. Map ID: Kangerdlugssuaq G250_68_o3_111.jpg 1982

Files S8: A collection of 66 aerial photographs available with the authors. Copyright is held by the Geological Survey of Denmark and Greenland.
Compute Batch
Clear Batch
Dataset Persistent Identifier Change Compute Batch
Compute Batch
Submit for Review

You will not be able to make changes to this dataset while it is in review.

Publish Dataset

Are you sure you want to republish this dataset?

Select if this is a minor or major version update.

Publish Dataset

This dataset cannot be published until GEUS Bulletin Dataverse is published by its administrator.

Publish Dataset

This dataset cannot be published until GEUS Bulletin Dataverse and Geological Data Centre are published.

Return to Author

Return this dataset to contributor for modification.