We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Carbonatite magmatism of the southern Siberian Craton 1 Ga ago: Evidence for the beginning of breakup of Laurasia in the early Neoproterozoic.
- Authors
Savelieva, V.; Danilova, Yu.; Bazarova, E.; Ivanov, A.; Kamenetsky, V.
- Abstract
Apatite and biotite from dolomite-ankerite and calcite-dolomite carbonatite dikes emplaced into the Paleoproterozoic metamorphic rock complex in the southern part of the Siberian Craton are dated by the U-Pb (LA-ICP-MS) and Ar-Ar methods, respectively. Proceeding from the lower intercept of discordia with concordia, the age of apatite from calcite-dolomite carbonatite is estimated to be 972 ± 21 Ma and that for apatite from dolomite-ankerite carbonatite, as 929 ± 37 Ma. Values derived from their upper intercept have no geological sense. The ages obtained for biotite by the Ar-Ar method are 965 ± 9 and 975 ± 14 Ma. It means that the formation of carbonatites reflects the earliest phases of the Neoproterozoic stage in extension of the continental lithosphere.
- Subjects
CARBONATITES; LAURASIA (Continent); MAGMATISM; URANIUM-lead dating; CRATONS; METAMORPHIC rocks
- Publication
Doklady Earth Sciences, 2016, Vol 471, Issue 1, p1140
- ISSN
1028-334X
- Publication type
Article
- DOI
10.1134/S1028334X16110222