Supplementary files for: Petrology of the Skaergaard Layered Series ...

• Main Authors: Thy, Peter, Tegner, Christian, Lesher, Charles E.
• Format: Dataset
• Language: unknown
• Published: GEUS Dataverse 2023
• Subjects: Greenland; East Greenland
• Online Access: https://dx.doi.org/10.22008/fk2/utfjp4; https://dataverse.geus.dk/citation?persistentId=doi:10.22008/FK2/UTFJP4

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 ...