Superimposed features and deformation mechanism of Early Mesozoic folds in the Sangzhi-Shimen area, northern Hunan
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摘要: 湘北桑植-石门一带下中生界连续发育一系列侏罗山式褶皱,褶皱叠加特征解析对探索桑植-石门复向斜褶皱变形期次及变形机制具有重要意义,同时对断裂控制褶皱变形的理论研究也具有启示意义。通过对桑植-石门一带地质构造剖面测制及褶皱叠加特征解析,识别出了印支期和早燕山期两期褶皱构造。研究区侏罗系与中三叠统之间的低角度不整合接触、白垩系与前白垩系之间的高角度不整合接触反映了印支运动和早燕山运动两期变形事件,可进一步推断桑植-石门一带褶皱可分为印支运动和早燕山运动两期。印支期褶皱轴迹主要呈北东东向-近东西向;早燕山期褶皱轴迹可分为2组:一组呈北东东向-近东西向;另一组呈北北东向。早燕山期2组褶皱与先期印支期褶皱叠加形成加强型和斜限型2种叠加类型,前者受控于印支期北东东向-近东西向逆断裂的继承性活动;后者受控于早燕山期北西西向区域挤压应力形成的北北东向逆断裂,且受限于先期北东东向-近东西向构造。此变形机制很好地解释了研究区褶皱轴面和逆冲断裂无向东或南东倾斜极性。Abstract: A series of Jurassic-type folds have continuously developed in the Mesozoic from the Sangzhi-Shimen area in northern Hunan. The analysis of the fold superimposition characteristics is of great significance to explore the deformation period and deformation mechanism of the Sangzhi-Shimen complex oblique folds, and also for the theoretical study of fold deformation controlled by faults. Based on the measurement of geological structure section and analysis of fold superimposition characteristics in Sangzhi-Shimen area, two fold structures in Indosinian and early Yanshanian were identified. The low-angle unconformity contact between the Jurassic and the Middle Triassic in the study area, and the high-angle unconformity contact between the Cretaceous and the Pre-Cretaceous reflect two deformation events of Indosinian and Early Yanshanian movement. It can be further inferred that the folds in the Sangzhi-Shimen area can be divided into two phases: the Indosinian movement and the early Yanshanian movement.The Indosinian fold axial trace mainly showed NEE to near EW; the early Yanshanian fold axial trace can be divided into two groups, one is NEE-near EW, the other is NNE. Two groups of early Yanshanian folds and pre Indosinian folds are superimposed to form two types of superposed folds, the enhanced type and the oblique limited type. The former is controlled by the inherited activities of the Indosinian NEE-near EW reverse fault; the latter is controlled by NNE trending reverse fault, which formed by NWW trending regional compressive stress in early Yanshanian, and it is limited by the pre NEE-near EW trending structure.This deformation mechanism well explains that the fold axis and thrust fault in the study area have no east or Southeast inclined polarity.
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图 1 研究区大地构造位置暨构造纲要图
Q.第四系; K-E.白垩纪-古近纪构造层; T3-J.晚三叠世-侏罗纪构造层; D-T2.泥盆纪-中三叠世构造层; Nh-S.南华纪-志留纪构造层; Qb2B.青白口纪板溪期构造层; Qb1L.青白口纪冷家溪期构造层; 1.平行不整合接触线; 2.角度不整合接触线;3.背斜轴迹; 4.向斜轴迹; 5.逆断裂; 6.左行平移断裂; 7.右行平移断裂; 8.地质构造剖面; 9.褶皱编号; 10.断裂编号; 11.研究区;12.地名。褶皱编号及名称: f1.新街背斜; f2.谷罗山向斜; f3.砂坝背斜; f4.淋溪河背斜; f5.桑植向斜; f6.人潮溪背斜; f7: 瑞塔铺向斜; f8: 石堤向斜; f9: 教字垭背斜; f10: 长茅山向斜; f11: 三坪背斜; f12: 尹家溪背斜; f13: 天子山向斜; f14: 观音山背斜; f15: 九渡河向斜; f16: 四方台向斜; f17: 雁池背斜; f18: 火连坡向斜; f19: 洞市向斜; f20: 杨家坊向斜; f21: 方石坪背斜; f22: 码头铺背斜; f23: 朱家沟向斜; f24: 英塔背斜; f25: 国太桥背斜; f26: 皂市背斜; f27: 三官寺向斜; f28: 新铺向斜; f29: 长岭向斜; f30: 苗市倒转背斜; f31: 杜家沟倒转向斜; f32: 杉板向斜; f33: 卞家岗向斜。断裂编号及名称: F1.沙塔坪断裂; F2.大塔坪断裂; F3.教字垭断裂; F4.新桥断裂; F5.慈利-保靖断裂; F6.皂市断裂; F7.新铺断裂; F8.雁池断裂; F9.辛银断裂
Figure 1. Geotectonic location and structure outline map of the study area
图 2 艾家湾-辛银地质构造剖面(GP01,剖面位置见图 1)
Qhj.全新统橘子洲组;K.白垩系; J1b.下侏罗统白田坝组; T2b.中三叠统巴东组; T1j.下三叠统嘉陵江组; T1d.下三叠统大冶组; P.二叠系; D.泥盆系; S.志留系; 1.角度不整合接触界线; 2.平行不整合接触界线; 3.断裂及编号; 4.飞来峰; 5.岩层产状;6.皱褶编号
Figure 2. Geological profile of Aijiawan-Xinyin
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