NDLI: $^{40}$Ar/$^{39}$Ar geochronology of the Faku tectonites: Implications for the tectonothermal evolution of the Faku block, northern Liaoning

Content Provider	Springer Nature Link
Author	Zhang, Xiaohui Wang, Hui Li, Tiesheng
Copyright Year	2005
Abstract	For lack of reliable isotopic chronological data, the metamorphic rock series in the Faku region of northern Liaoning has long been regarded as the platform basement. Recent studies reveal that these deformed and metamorphosed rocks, with a variety of protoliths of plutonic intrusions and supracrustal volcanic and sedimentary rocks, were genetically related to later ductile shearing events, and they, together with the syntectonic intrusions, constituted the large-scale Faku tectonites. In this paper, we report new $^{40}$Ar/$^{39}$Ar data on hornblende, biotite, and K-feldspar from typical granitic mylonites in this suite of tectonites. The plateau age 256 Ma of FK53 hornblende and the high-temperature plateau age 262 Ma of Fk51-1 biotite should represent the cooling ages when the granites, formed as a result of Paleozoic oceanic crustal subduction beneath the continental crust or collision of multiple micro-continental blocks, were exhumed into shallow crustal levels. The plateau age 231 Ma of FK51-1 boitite and the apparent age 227 Ma of Fk51-2 K-feldspar are interpreted to record the time of ductile deformation occurring under greenschist facies conditions, i.e. the formation age of the Faku tectonites, while the age gradient from 197 Ma to 220 Ma of Fk51-2 K-feldspar probably record the subsequent stable uplift-cooling process. The tectonic exhumation event indicated by the plateau age 180 Ma of Fk51-2 K-feldspar may be associated with the onset of paleo-Pacific subduction beneath the North China plate. In addition, the U-Pb dating of FK54 zircon from later-intruded granite yields the age of crystallization of this super-unit intrusion at 159 Ma, thus establishing an upper limit for the formation age of the Faku tectonites, while the plateau age 125 Ma of Fk54 K-feldspar most likely corresponds to the rapid cooling and tectonic denudation event associated with the final collision between the Siberian plate and the North China plate. These isotopic ages provide important geochronological constraints for re-evaluating the tectonic essence of the Faku Faulted Convex and ascertaining the suturing boundary between the North China Platform and the Xingmeng Fold System.
Starting Page	601
Ending Page	612
Page Count	12
File Format	PDF
ISSN	10069313
Journal	Science in China Series D: Earth Sciences
Volume Number	48
Issue Number	5
e-ISSN	18622801
Language	English
Publisher	Science in China Press
Publisher Date	2005-01-01
Publisher Place	Beijing
Access Restriction	Subscribed
Subject Keyword	northern Liaoning tectonite $^{40}$Ar/$^{39}$Ar age zircon U-Pb age Faku Faulted Convex Geosciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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