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Geochronology, geochemistry, and tectonic implications of upper Silurian - Lower Devonian meta-sedimentary rocks from the Jiangyu Group in eastern Jilin Province, Northeast China.
- Source :
-
Canadian Journal of Earth Sciences . 2018, Vol. 55 Issue 5, p490-504. 15p. - Publication Year :
- 2018
-
Abstract
- In this study, we present detrital zircon U-Pb ages and Hf isotopic data and whole-rock geochemical data from meta-sedimentary rocks of the Jiangyu Group in eastern Jilin Province (Northeast China) to constrain the late Silurian - Early Devonian tectonic evolution of the southeastern Xing'an-Mongolia Orogenic Belt. Two samples of the meta-sedimentary rocks from the Jiangyu Group yielded concordant ages ranging from 2926 to 415 Ma, and the youngest zircon populations of the two samples yielded weighted mean ages of 427 ± 3 and 426 ± 3 Ma, respectively. Combined with reliable published muscovite 40Ar-39Ar ages of 408 Ma from the overlying metamorphic ophiolitic mélange, these data indicate that the protoliths of the Jiangyu Group were deposited during the late Silurian - Early Devonian Era. A comparison of the U-Pb ages and Hf isotopic data for detrital zircons from northeastern Gondwana and the Jiangyu Group indicates a probable tectonic affinity. The whole-rock geochemical data indicate that the protoliths of the meta-sedimentary rocks from the Jiangyu Group were graywackes deposited in a continental arc setting. Based on the recognition of the early to middle Paleozoic subduction-accretion events along the eastern segment of the northern margin of the North China Craton (NCC), we infer that the subduction-accretion events may have occurred in the Yanbian area followed by one or more arc-continent collisions after the Early Devonian. [ABSTRACT FROM AUTHOR]
- Subjects :
- *GEOCHEMISTRY
*SEDIMENTARY rocks
*STRUCTURAL geology
*PALEOZOIC Era
*SUBDUCTION
Subjects
Details
- Language :
- English
- ISSN :
- 00084077
- Volume :
- 55
- Issue :
- 5
- Database :
- Academic Search Index
- Journal :
- Canadian Journal of Earth Sciences
- Publication Type :
- Academic Journal
- Accession number :
- 129421507
- Full Text :
- https://doi.org/10.1139/cjes-2017-0260