Age, Association and Provenance of the "Neoproterozoic" Fengshuigouhe Group in the Northwestern Lesser Xing'an Range, NE China: Constraints from Zircon U-Pb Geochronology

Meijun Xu; Wenliang Xu; Feng Wang; Fuhong Gao

doi:10.1007/s12583-012-0291-0

Volume 23 Issue 6

Dec 2012

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Journal of Earth Science > 2012 > 23(6): 786-801.

Meijun Xu, Wenliang Xu, Feng Wang, Fuhong Gao. Age, Association and Provenance of the 'Neoproterozoic' Fengshuigouhe Group in the Northwestern Lesser Xing'an Range, NE China: Constraints from Zircon U-Pb Geochronology. Journal of Earth Science, 2012, 23(6): 786-801. doi: 10.1007/s12583-012-0291-0

Citation:

Meijun Xu, Wenliang Xu, Feng Wang, Fuhong Gao. Age, Association and Provenance of the "Neoproterozoic" Fengshuigouhe Group in the Northwestern Lesser Xing'an Range, NE China: Constraints from Zircon U-Pb Geochronology. Journal of Earth Science, 2012, 23(6): 786-801. doi: 10.1007/s12583-012-0291-0

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Age, Association and Provenance of the "Neoproterozoic" Fengshuigouhe Group in the Northwestern Lesser Xing'an Range, NE China: Constraints from Zircon U-Pb Geochronology

doi: 10.1007/s12583-012-0291-0

College of Earth Sciences, Jilin University, Changchun 130061, China

Funds:

the National Natural Science Foundation of China 41072038

China Geological Survey 1212010070301

the Opening Foundation of the State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan

More Information

Corresponding author: Wenliang Xu, xuwl@jlu.edu.cn
Received Date: 21 Mar 2012
Accepted Date: 08 Sep 2012
Publish Date: 01 Dec 2012

Abstract

Abstract

The formation time of the Fengshuigouhe (风水沟河) Group in the northwestern Lesser Xing'an Range (小兴安岭), NE China, remains controversial owing to the lake of the precise dating data. This article reports zircon U-Pb ages for the leptynite and gneissic granitoids from the Fengshuigouhe Group in the northwestern Lesser Xing'an Range. The aim is to constrain the formation time and provenance of Fengshuigouhe Group. Field observation indicates that the Fengshuigouhe Group consists of a suit of metamorphic rocks (leptynite) and gneissic granitoids intruding the leptynite, and that both of them are cut by late granitic pegmatite. Zircons from two leptynites are euhedral-subhedral in shape and display oscillatory zoning in CL (cathodeluminescence) images. These detrital zircons give weighted mean ages of 255, 291, 321, 361, 469, and 520 Ma. The youngest age of them is interpreted to maximum depositional age of the protoliths of these leptynites. Zircons from gneissic granites are euhedral and subhedral in shape and exhibit typical oscillatory zoning in CL images. The dating results indicate that the gneissic granites were formed in the Early Jurassic (185±2 Ma). Zircons from the late granitic pegmatite are subhedral in shape and exhibit two types in CL images: structureless and oscillatory zoning. The former gives a weighted mean age of 143±1 Ma, considered to represent the timing of crystallization of the pegmatite, the latter yield several groups of ages: 178, 273, 319, 482, 611, and 788 Ma, representing the crystallization age of inherited or captured zircons entrained by the pegmatite. Taken together, we conclude that the Fengshuigouhe Group in the northwestern Lesser Xing'an Range formed between Late Paleozoic (255 Ma) to Early Mesozoic (185 Ma), rather than Neoproterozoic as previously believed, and that the sediments in the Fengshuigouhe Group were sourced directly from geological bodies in the study area and adjacent regions.
- the Lesser Xing'an Range,
- Fengshuigouhe Group,
- formation time,
- leptynite,
- zircon U-Pb geochronology

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