A Paleomagnetic Study of Sariolian Conglomerates of the Onega Structure of the Karelian Protocraton: The Problem of Global Paleoproterozoic Remagnetization

Resumo

A paleomagnetic study of Sariolian (2.4–2.3 Ga) conglomerates of the Onega structure distinguished two characteristic magnetization components. The average direction of the mid-temperature magnetization component has a concentrated distribution and coincides with the direction of the Svecofennian remagnetization within the Karelian protocraton. The directions of high-temperature magnetization components distinguished in conglomerates show a wide scatter of values that is evidence of the primary origin of this magnetization component. Two clusters of high-temperature components associated not only with the protolith composition, but also with the different conditions of rock transformation, in particular their fluid saturation, are distinguished.