40Ar-39Ar ages of the Louzidian-Dachengzi ductile shear zone near Chifeng, Inner Mongolia and their tectonic significance

Autor:	Hui Wang, Zhiping Pu, Xiaohui Zhang, Tiesheng Li
Rok vydání:	2002
Předmět:	Isochron geography Multidisciplinary Plateau geography.geographical_feature_category Yield (engineering) Metamorphic core complex Detachment fault Tectonics Sinistral and dextral Shear zone Petrology Seismology Geology
Zdroj:	Chinese Science Bulletin. 47:1292
ISSN:	1001-6538
DOI:	10.1360/02tb9287
Popis:	The Louzidian normal fault occurs as the eastern detachment fault of the Kalaqin metamorphic core complex. Field observations and microstructural analyses reveal that the Louzidian-Dachengzi ductile shear zone developed in its lower-plate was genetically related to sinistral strike-slips and extensional faulting. Two samples from this ductile shear zone yield 40Ar-39Ar plateau ages of 133 Ma (Bi) and 126 Ma (Kp), which are concordant with their isochron ages. The plateau age of 133 Ma (Bi) records the formation age of the ductile shear zone. The inconsistent relationship between the earlier strike-slip ductile shear zone and the later normal fault makes the Kalaqin Quasi-metamorphic core complex distinctive from Cordilleran metamorphic core complex. These ages provide important geochronological data for putting constraints on the formation age and genesis of such ductile shear zones.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::98e9a6a682466fc305a463c6ccdacc6b https://doi.org/10.1360/02tb9287 Zobrazit plný text záznamu Full text from SpringerLink