@article{6fa94f49c831443db605bf621e86a3a1,
title = "Mega arrowhead interference patterns in the central part of the Yanshan Orogenic Belt, North China",
abstract = "The Chengde-Pingquan region is located in the central part of the Yanshan Orogenic Belt (YOB). At Daheishan and Pingquan in the central YOB, thrusts and folds of variable trends are displayed in 2 km-scale fold interference patterns. Detailed field mapping was conducted to decipher the geometry of these two superimposed structures. Map-view geometry and stereonet plots for outcrop-scale folds indicate that the superimposed structures form arrowhead interference pattern where NW-SE-trending F1 folds are refolded by later ENE-WSW F2 folding. After remove the effects of later faulting, restored map-views of the superimposed structures show that when the F1 folds have inclined axial surfaces but with no an overturned limb, an arrowhead interference pattern (here called modified type-2 pattern) can form. Our field data and reinterpretation of the findings of previous studies suggest that five major shortening phases have occurred in the Chengde-Pingquan region. The first two phases, which formed the superimposed folds, occurred earlier than the Late Triassic (D1) and during the Late Triassic to Early Jurassic (D2). These two phases were followed by three deformation phases that are mainly characterized by thrusting and strike-slip faulting, which strongly modified the large-scale fold interference patterns.",
keywords = "Arrowhead, Fold interference patterns, Kilometer scale, The yanshan orogenic belt",
author = "Hongling Deng and Koyi, \{Hemin A.\}",
note = "Funding Information: The field mapping was supported by National Science Foundation of China (Grant 90814007 to Changhou Zhang) and China Geological Survey (Grant 1212011121073 to Changhou Zhang) in 2012 and 2013. Hongling Deng is funded by China Scholarship Council (Grant 2010640002 ), Department of Earth Sciences at Uppsala University for partial salary compensation, and the Liljewalchs Scholarship for travel and field work in 2013. Hemin Koyi is funded by the Swedish Research Council (VR). The authors would like to thank Prof. Changhou Zhang from China University of Geosciences (Beijing) for the financial support from his funding covering field vehicle, driver, and MSc students who accompanied Hongling Deng during the two field seasons. Hongling Deng appreciates Prof. Zhang for his constructive suggestions and advices before and after the field trips. The authors also thank the MSc students Hongdan Deng, Jiasui Ouyang, Xiaolong Shi and Yipeng Zhang from China University of Geosciences (Beijing), for assistances in field. Thanks also go to the driver Yong Zhang for his safe driving and assistances during the field trips. Many thanks to Peter Hudleston and Tim Cope for their constructive reviews, comments and suggestions, which helped improving this manuscript, and to the editor Cee Passchier for handling the manuscript. Publisher Copyright: {\textcopyright} 2015.",
year = "2015",
month = nov,
day = "1",
doi = "10.1016/j.jsg.2015.06.004",
language = "British English",
volume = "80",
pages = "25--37",
journal = "Journal of Structural Geology",
issn = "0191-8141",
publisher = "Elsevier Ltd",
}