Petrography and mineral chemistry of lamproite-hosted xenoliths from Kjakebeinet, western Dronning Maud Land, Antarctica
Jurassic (159 Ma), ultrapotassic, mica-rich dykes of Kjakebeinet represent the youngest magmatic rock type observed in western Dronning Maud Land, Antarctica; abundant xenoliths are enclosed by the dykes. A petrographical description of the xenoliths and one of the dykes was made to distinguish the...
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/42262 2023-08-20T04:01:04+02:00 Petrography and mineral chemistry of lamproite-hosted xenoliths from Kjakebeinet, western Dronning Maud Land, Antarctica Romu, Ilona Helsingin yliopisto, Matemaattis-luonnontieteellinen tiedekunta, Geotieteiden ja maantieteen laitos University of Helsinki, Faculty of Science, Department of Geosciences and Geography Helsingfors universitet, Matematisk-naturvetenskapliga fakulteten, Institutionen för geovetenskaper och geografi 2013 application/pdf http://hdl.handle.net/10138/42262 eng eng Helsingfors universitet University of Helsinki Helsingin yliopisto URN:NBN:fi-fe2017112252351 http://hdl.handle.net/10138/42262 Geology Geologia Geologi pro gradu-avhandlingar pro gradu -tutkielmat master's thesis 2013 ftunivhelsihelda 2023-07-28T06:26:43Z Jurassic (159 Ma), ultrapotassic, mica-rich dykes of Kjakebeinet represent the youngest magmatic rock type observed in western Dronning Maud Land, Antarctica; abundant xenoliths are enclosed by the dykes. A petrographical description of the xenoliths and one of the dykes was made to distinguish the rock types and to gain information of the unknown basement below Kjakebeinet, situated on the southern edge of Vestfjella mountainrange. The mineral chemistry and petrography of the xenoliths and one of the lamproite dykes were studied using petrographic microscope and electron microprobe (EDS-mode). Rb-Sr and Sm-Nd isotopic determinations were made on metagabbroic and carbonatite xenoliths. Most of the xenoliths record evidence of granulite facies metamorphosis and they represent several crustal rock types. Tonalite, alkali feldspar granite, and augen gneisses, metagabbros and metasedimentary xenoliths were observed. Two of the xenoliths, carbonatite, and phlogopite rock, are cognate. This thesis shows that the crust below the southern Vestfjella is heterogenic, and contains differentiated metaigneous rock types. The xenoliths include Proterozoic basement gneisses, and possibly also Permian sedimentary rocks and Mesozoic igneous rocks. The studied lamproite dyke is phlogopite-sanidinediopside-olivine lamproite which shows affinity to madupitic lamproites and group II kimberlites. Master Thesis Antarc* Antarctica Dronning Maud Land Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto Dronning Maud Land Kjakebeinet ENVELOPE(-14.867,-14.867,-73.800,-73.800) Vestfjella ENVELOPE(-14.000,-14.000,-73.167,-73.167) |
institution |
Open Polar |
collection |
Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
Geology Geologia Geologi |
spellingShingle |
Geology Geologia Geologi Romu, Ilona Petrography and mineral chemistry of lamproite-hosted xenoliths from Kjakebeinet, western Dronning Maud Land, Antarctica |
topic_facet |
Geology Geologia Geologi |
description |
Jurassic (159 Ma), ultrapotassic, mica-rich dykes of Kjakebeinet represent the youngest magmatic rock type observed in western Dronning Maud Land, Antarctica; abundant xenoliths are enclosed by the dykes. A petrographical description of the xenoliths and one of the dykes was made to distinguish the rock types and to gain information of the unknown basement below Kjakebeinet, situated on the southern edge of Vestfjella mountainrange. The mineral chemistry and petrography of the xenoliths and one of the lamproite dykes were studied using petrographic microscope and electron microprobe (EDS-mode). Rb-Sr and Sm-Nd isotopic determinations were made on metagabbroic and carbonatite xenoliths. Most of the xenoliths record evidence of granulite facies metamorphosis and they represent several crustal rock types. Tonalite, alkali feldspar granite, and augen gneisses, metagabbros and metasedimentary xenoliths were observed. Two of the xenoliths, carbonatite, and phlogopite rock, are cognate. This thesis shows that the crust below the southern Vestfjella is heterogenic, and contains differentiated metaigneous rock types. The xenoliths include Proterozoic basement gneisses, and possibly also Permian sedimentary rocks and Mesozoic igneous rocks. The studied lamproite dyke is phlogopite-sanidinediopside-olivine lamproite which shows affinity to madupitic lamproites and group II kimberlites. |
author2 |
Helsingin yliopisto, Matemaattis-luonnontieteellinen tiedekunta, Geotieteiden ja maantieteen laitos University of Helsinki, Faculty of Science, Department of Geosciences and Geography Helsingfors universitet, Matematisk-naturvetenskapliga fakulteten, Institutionen för geovetenskaper och geografi |
format |
Master Thesis |
author |
Romu, Ilona |
author_facet |
Romu, Ilona |
author_sort |
Romu, Ilona |
title |
Petrography and mineral chemistry of lamproite-hosted xenoliths from Kjakebeinet, western Dronning Maud Land, Antarctica |
title_short |
Petrography and mineral chemistry of lamproite-hosted xenoliths from Kjakebeinet, western Dronning Maud Land, Antarctica |
title_full |
Petrography and mineral chemistry of lamproite-hosted xenoliths from Kjakebeinet, western Dronning Maud Land, Antarctica |
title_fullStr |
Petrography and mineral chemistry of lamproite-hosted xenoliths from Kjakebeinet, western Dronning Maud Land, Antarctica |
title_full_unstemmed |
Petrography and mineral chemistry of lamproite-hosted xenoliths from Kjakebeinet, western Dronning Maud Land, Antarctica |
title_sort |
petrography and mineral chemistry of lamproite-hosted xenoliths from kjakebeinet, western dronning maud land, antarctica |
publisher |
Helsingfors universitet |
publishDate |
2013 |
url |
http://hdl.handle.net/10138/42262 |
long_lat |
ENVELOPE(-14.867,-14.867,-73.800,-73.800) ENVELOPE(-14.000,-14.000,-73.167,-73.167) |
geographic |
Dronning Maud Land Kjakebeinet Vestfjella |
geographic_facet |
Dronning Maud Land Kjakebeinet Vestfjella |
genre |
Antarc* Antarctica Dronning Maud Land |
genre_facet |
Antarc* Antarctica Dronning Maud Land |
op_relation |
URN:NBN:fi-fe2017112252351 http://hdl.handle.net/10138/42262 |
_version_ |
1774722413575012352 |