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Paleoproterozoic mafic dyke from Kongling terrain in the Yangtze Craton and its implication.
- Source :
- Chinese Science Bulletin; Mar2009, Vol. 54 Issue 6, p1098-1104, 7p, 1 Black and White Photograph, 2 Charts, 2 Graphs, 1 Map
- Publication Year :
- 2009
-
Abstract
- Mat ic dyke is a sign of regional extension, and thus has important tectonic significance. A great amount of mafic dykes occur in the Kongling terrain of the Yangtze Craton, which have great bearing on the early evolution of the Yangtze Craton. Their ages, however, have not been well constrained. In this paper we report an integrated study of zircon U-Pb age and Hf isotope compositions for a mafic dyke in the Kongling terrain. The zircons yielded a weighted mean <superscript>207</superscript>Pb/<superscript>206</superscript>Pb age of 1852±11Ma, which represents its intrusion age. They have ϵ<subscript>Hf</subscript>(∫) values of -6.3 to 0.5, with a weighted mean of -3.06±0.88, suggesting that the mat ic dyke came from metasomatic mantle. The results indicate that the Yangtze Block had transformed into post-collisional extensional regime at Ca. 1850 Ma. In the same period, the Yangtze Craton shows enough rigidity to produce brittle rupture, and thus has the characteristics of a craton. [ABSTRACT FROM AUTHOR]
- Subjects :
- DIKES (Geology)
ZIRCON
GEMS & precious stones
CRATONS
CRUST of the earth
Subjects
Details
- Language :
- English
- ISSN :
- 10016538
- Volume :
- 54
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- Chinese Science Bulletin
- Publication Type :
- Academic Journal
- Accession number :
- 37591301
- Full Text :
- https://doi.org/10.1007/s11434-008-0558-0