Cr-spinels in the Franklinian Mobile Belt : a geochemical record of Paleozoic tectonics
| Autor: | Forbes Halldén, Malvina |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
geology
Canada suprasubduktionszon spinel geokemi suprasubduction zone öbåge petrogenetic indicator alteration island arc Cr-spinel Pearya EMPA geologi kromit elektronmikrosondanalys EMP chromite geochemistry Clements Markham fold belt spinell Paleozoikum Franklinian Mobile Belt IA svepeletronmikroskopi Kulutingwak-formationen Cr-spinell scanning electron microscope mikroskopi Memorial University of Newfoundland petrogenetisk indikator Arctic Canadian Archipelago Ellesmereön Ellesmere Island Kanada SSZ 2017 Circum-Arctic Structural Events Expedition 19 SEM electron microprobe electron probe microanalyzer microscopy Kanadas arktiska öar EPMA electron micro probe analyzer Kulutingwak Formation Paleozoic |
| Popis: | The chemical compositions of Cr-spinel extracted from mafic and ultramafic rocks collected on Ellesmere Island in the Arctic Canadian Archipelago were obtained through electron microprobe analyses. The extensively altered rocks are sampled from rock units in the Franklinian MobileBelt, which is representative of a Paleozoic tectonically active oceanic regime of which little is presently known. The evolutionary trend of the ocean basin may have changed when the exotic crustal fragments now called the Pearya terrane were accreted to the North American margin through poorly understood tectonic processes sometime prior to the Devonian. The results of the analysis are used to determine the tectonic setting associated with the rock units. The results reveal that the Cr-spinels predominantly have a supra-subduction zone geochemical signature, suggesting an island arc origin. |
| Databáze: | OpenAIRE |
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