Influence of Mechanical Stratigraphy on the Deformation Evolution of Fold-Thrust Belts: Insights from the Analogue Model
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Influ uence of Mechanical Stratigr S raphy on o the D Deforma ation Evolu ution off Fold-T Thrust Belts: B Insightss from the Ana alogue Mod deling of o Easteern Sich huan-W Western Hunan H and Hu ubei, South Chiina W Wengang He * Collegge of Engineerinng and Technoloogy, Zunyi Norm mal University,, Zunyi 563002,, China; State Key K Laboratoryy of Petroleum Resource R and Prospecting, P Ch hina University of Petroleum, B Beijing 102249,, China W Wengang He: httpps://orcid.org/0000-0002-13511-5981 AB BSTRACT: The T eastern Sichuan-westerrn Hunan and d Hubei belt (ESWHHB) is an importtant folld-thrust belt in i the Middle––Upper Yangtzze region of China, and it is also an imporrtant area for petrooleum and gas prospect in China. The influ uence of mecha anical stratigraaphy on the deeformation evo olutioon of the ESW WHHB is a hott problem thaat has received d widespread attention. a How wever, due to the complexity of geeological condiitions, this issu ue has not beeen sufficiently addressed. Prreviews geologiical exp ploration stud dies show that the deformatioon evolution of o the belt is cllosely related tto the mechaniical strratigraphy. Ph hysical simulattion has proven to be effectiive for studyin ng the deformaation evolution n of folld-and-thrust belt. b Based on the geologicall conditions of the ESWHHB B, six groups of physical mod dels weere designed too analyze the in nfluences of th he ductile layerr and overlap configuration on the structu ural deeformation of the t ESWHHB. The results show s that the mechanical stratigraphy haas significant conc trool on the deforrmation evolutiion of the fold--thrust belt. Th he ESWHHB evolution e is rellated to the low wer visscosity of the ductile d layer an nd the larger th hickness of thee ductile layer, while only graadual propaga ated folld-and-thrust belt b can be ressulted from thee higher viscossity of the ducttile layer and tthe smaller thiickneess of the ductiile layer. Additionally, the ovverlap between the stratigraaphy at variou us structural belts leaads to significaant differencess in their mech hanical properties, and it crittically influencces the structu ural paatterns of the ESWHHB. E KE EY WORDS: fold-thrust belt, eastern Sich huan-western Hunan and Hubei, H mechaniical stratigrap phy, ph hysical modelin ng. 0
INTRODU UCTION The easttern Sichuan-w western Hunaan and Hubei belt (ESWHHB) iss an important fold-thrust belt that is locateed in the Middle–U Upper Yangtzee region of Chhina (Fig. 1). The structural pattterns of the ESWHHB are apparently a diffferent from classicall fold-thrust beelts in the worlld, although thee deformation chaaracteristics in the fold-thrust belts of typicaal regions in the worldwide w also have h been contrrolled commonly by the weak décoollement layerss (He et al., 20018; Bonini, 20007). The influencee of mechanicaal stratigraphy on the deform mation evolution of thhe fold-thrust beelt is an importtant geological probp lem and this isssue has receiveed great attentioon in the last deccades owing to i
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