دورية أكاديمية
1.88 Ga granitoids at Sorsakoski, Central Finland: A-type magmatism within the Raahe-Ladoga suture zone
| العنوان: | 1.88 Ga granitoids at Sorsakoski, Central Finland: A-type magmatism within the Raahe-Ladoga suture zone |
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| المؤلفون: | Perttu Mikkola, Maija Pietilä, O. Tapani Rämö, Hannu Huhma |
| المصدر: | Bulletin of the Geological Society of Finland, Vol 96, Iss 1, Pp 59-80 (2024) |
| بيانات النشر: | Geological Society of Finland, 2024. |
| سنة النشر: | 2024 |
| المجموعة: | LCC:Geology |
| مصطلحات موضوعية: | central finland granitoid complex, paleoproterozoic, geochemistry, zircon age, u-pb, a-type, granite, diorite, bimodal, svecofennian, finland, Geology, QE1-996.5 |
| الوصف: | Four quartz monzonite – granite intrusions forming the Sorsakoski granite lithodeme, are found within the Raahe-Ladoga suture zone in Central Finland. The prevailing potassium feldspar megacrystic quartz monzonites and granites form a bimodal association with diorites and gabbros. The granitoids are mainly calc-alkaline, ferroan, per- to metaluminous, and have high Zr and REE contents. Dominant mafic minerals are biotite and hornblende, clinopyroxene and orthopyroxene are locally present. The mafic units display effects of fractionation of clinopyroxene. In our interpretation, these intrusions were emplaced during regional late stages of deformation and postcrystallisation deformation partitioned into major shear zones leaving bulk of the intrusions relatively undeformed. Based on one new (1876 ± 6 Ma) and one pre-existing (1882 ± 5 Ma) U-Pb zircon age determination, the crystallisation age of the granitoids can be assumed at ca. 1880 Ma. Based on mineralogy, petrography, geochemistry, bimodal nature of magmatism and age, we correlate these intrusions to the A-type rocks of the previously described Saarijärvi suite. This shows that the syn-orogenic A-type magmatism extended eastwards beyond the Central Finland Granitoid Complex. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 0367-5211 1799-4632 |
| Relation: | https://www.geologinenseura.fi/sites/geologinenseura.fi/files/bulletin_vol_96_part_1_2024_59_80.pdf; https://doaj.org/toc/0367-5211; https://doaj.org/toc/1799-4632 |
| DOI: | 10.17741/bgsf/96.1.003 |
| URL الوصول: | https://doaj.org/article/d92bf110ef59456ab3ef8d1a3db5db3d |
| رقم الأكسشن: | edsdoj.92bf110ef59456ab3ef8d1a3db5db3d |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 03675211 17994632 |
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| DOI: | 10.17741/bgsf/96.1.003 |