Geometric and temporal evolution of an extensional detachment fault, Hohhot metamorphic core complex, Inner Mongolia, China

Research Article| November 01, 2002 Geometric and temporal evolution of an extensional detachment fault, Hohhot metamorphic core complex, Inner Mongolia, China Gregory A. Davis; Gregory A. Davis 1Department of Earth Sciences, University of Southern California, Los Angeles, California 90089-0740, USA Search for other works by this author on: GSW Google Scholar Brian J. Darby; Brian J. Darby 1Department of Earth Sciences, University of Southern California, Los Angeles, California 90089-0740, USA Search for other works by this author on: GSW Google Scholar Zheng Yadong; Zheng Yadong 2Department of Geology, Peking University, Beijing 100871, China Search for other works by this author on: GSW Google Scholar Terry L. Spell Terry L. Spell 3Department of Geoscience, University of Nevada, Las Vegas, Nevada 89154-4010, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Gregory A. Davis 1Department of Earth Sciences, University of Southern California, Los Angeles, California 90089-0740, USA Brian J. Darby 1Department of Earth Sciences, University of Southern California, Los Angeles, California 90089-0740, USA Zheng Yadong 2Department of Geology, Peking University, Beijing 100871, China Terry L. Spell 3Department of Geoscience, University of Nevada, Las Vegas, Nevada 89154-4010, USA Publisher: Geological Society of America Received: 29 Mar 2002 Revision Received: 25 Jun 2002 Accepted: 16 Jul 2002 First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2002) 30 (11): 1003–1006. https://doi.org/10.1130/0091-7613(2002)030<1003:GATEOA>2.0.CO;2 Article history Received: 29 Mar 2002 Revision Received: 25 Jun 2002 Accepted: 16 Jul 2002 First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Gregory A. Davis, Brian J. Darby, Zheng Yadong, Terry L. Spell; Geometric and temporal evolution of an extensional detachment fault, Hohhot metamorphic core complex, Inner Mongolia, China. Geology 2002;; 30 (11): 1003–1006. doi: https://doi.org/10.1130/0091-7613(2002)030<1003:GATEOA>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract The Early Cretaceous Hohhot metamorphic core complex and its master Hohhot detachment fault are ∼400 km west of Beijing in the Daqing Shan (Mountains) of Inner Mongolia. The complex developed across the east-trending Yinshan fold-and-thrust belt within <4 m.y. following cessation of thrusting ca. 125 Ma (see note added in proof in main text). Postcontractional extension was initiated within a mid-crustal zone of mylonitic and ductile shear that was in part controlled by Carboniferous(?) strata sandwiched between its Proterozoic and Archean crystalline basement and an overlying thrust sheet of similar crystalline rocks. The Hohhot detachment fault appears to have rooted into deep, kinematically active levels of the mid-crustal shear zone. Higher, inactive levels of the mylonitic section were transected by the fault and carried upward in its footwall. Geometries of the footwall mylonitic rocks indicate localized ramp-flat geometries of the fault within and across them. The crosscut top of the mylonitic sequence defines a mylonitic front that departs from the gently south dipping detachment fault and dips northward into its footwall. Early Cretaceous extension was widespread elsewhere in northern China, and was particularly pronounced in the Yunmeng Shan core complex north of Beijing. The gravitational collapse of orogenically thickened crust acting in concert with localized centers of deep-seated plutonism appear to have led to the development of isolated metamorphic core complexes within a broad region of more distributed extensional deformation. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.