کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4688317 1635786 2013 18 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
An early Jurassic dextral strike-slip system in southern South China and its tectonic significance
ترجمه فارسی عنوان
یک سیستم اعتصاب پیشین ژوراسیک در جنوب چین و اهمیت ساختاری آن
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
چکیده انگلیسی

Ductile shear structure of the Guanging-Bobai fault belt in the SW part of the Qin-Hang belt, South China, has been investigated and interpreted in terms of radiometric dating data. A series of ductile shear zones occurs within the fault belt with deformation and metamorphic features indicative of formation under medium temperature and pressure conditions. The foliation such formed is steeply dipping and bears a gently plunging lineation, which along with the dextral kinematic indicators determines a broad NE-SW-trending dextral strike-slip regime responsible for the development of these shear zones. Field overprinting relationships indicate that this dextral shear is pre-dated by the Indosinian (P2-T) NNE-verging thrusting and post-dated by the Yanshanian (J2-K2) SE-verging thrusting, and thus occurred during a transitional period between the two orogenies. 40Ar–39Ar radiometric dating on muscovite from mylonites further constrains timing of the dextral shear to the Early Jurassic (187–193 Ma). Based on the coeval tectonic framework of eastern Asia, we propose here that the dextral strike-slip system was initiated by the far-field oblique stress field from the incipient subduction of the Izanagi oceanic plate. An offset continental margin of the South China plate may have been created in response to this transcurrent movement along the fault belt, dissecting and displacing not only a relict Caledonian foreland basin, but also an Indosinian magmatic belt.


► A NE-SW-trending ductile shear system is documented in southern South China.
► Kinematic analysis derives a dextral strike-slip regime for the shear belt.
► 40Ar–39Ar dating determines an Early Jurassic age for the dextral shearing.
► This dextral system was initiated by oblique subduction of the Paleo-Pacific plate.
► This dextral system has offset the southern margin of the South China plate.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Geodynamics - Volume 63, January 2013, Pages 27–44
نویسندگان
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