BASIC CHARACTERISTICS OF THE YANSHAN MOVEMENT IN NORTHEASTERN SHANXI -A SUMMARY OF REGIONAL SURVEY OF THE 1: 250000 YINGXIAN COUNTY SHEET
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摘要: 晋东北地区燕山期地壳活动剧烈而频繁, 经历了3次由伸展→挤压转换→隆升和岩浆活动过程。燕山运动早期形成早侏罗世断陷盆地和中侏罗世挤压坳陷型聚煤构造盆地; 中期中晚侏罗世形成被NW、NE向深大断裂围限的火山断陷盆地, 中基性-酸性火山喷发和浅成、超浅成中酸性岩浆侵入, 晚侏罗世末形成了一系列NNE向褶皱和逆冲推覆构造带; 晚期早白垩世再次形成断陷盆地和开阔平缓褶皱, 义县组不整合在火山岩之上, 晚白垩世处于挤压造山后的山体隆升阶段, 左云组不整合在义县组之上, 伴随有壳源型花岗岩侵入, NW、NE向断裂复活, 形成地堑、地垒式断裂组合, 导致山体隆升。Abstract: The Yanshanian crustal activity in northeastern Shanxi was intense and frequent and underwent a process of extension→transpression→uplift and magmatism.The early stage of the Yanshan movement generated an Early Jurassic downfaulted basin and a Middle Jurassic compressional-downwarped coal-accumulating basin.In the middle stage, the Mid-Late Jurassic witnessed the formation of a volcanic downfaulted basin bounded by NW and NE deep faults, intermediate-basic and acid volcanic eruption and hypabyssal and near-surface intermediate-acid magmatic intrusion, and the terminal Late Jurassic witnessed the formation of a number of NNE-trending folds and overthrust zones.In the late stage, in the Early Cretaceous a downfaulted basin and open gentle folds once again formed and the Yixian Formation unconformably rested on volcanic rocks; the Late Cretaceous was a stage of mountain uplift after compressional orogeny, when the Yixian Formation was unconformably overlain by the Zuoyun Formation, accompanied by intrusion of crust-derived granite, and NE-and NE-trending faults were revived, forming a graben-and horst-type fault combination and resulting in mountain uplift.
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图 2 西柏林逆冲断层被义县组不整合覆盖
K1y-义县组; J3z-张家口组; CPt-太原组
Figure 2. The Xibolin thrust is unconformably overlain by the Yixian Formation
图 3 鹅毛口断裂带构造剖面
Qp3s-峙峪组; J2d-大同组; J1y-永定庄组; P2sh-石盒子组; P1sx-山西组; Ct-太原组; O2m-马家沟组; O1s-三山子组; O1 y-冶里组; εOc-炒米店组; ε3g-崮山组; ε2z-张夏组; ε2m-馒头组; Ar2-中太古代片麻岩
Figure 3. Structural section of the Emaokou fault zone in Shentou-Emaokou
图 4 太白维山推覆构造地质剖面图(据刘德佑等[18], 1987)
Kz-新生界; J3z-张家口组; J3t-土城子组; C-石炭系; O-奥陶系; ε-寒武系; Pt2-3-中新元古界; Ar3W-五台群; Ar3Ygn-太古宙义兴寨片麻岩
Figure 4. Geological section of the Weishan nappe structure in Taibai
图 5 系舟山逆冲推覆构造带构造剖面
Qp3m-马兰组; CPt-太原组; O2m1-2-马家沟组—至二段; O2m3-马家沟组三段; O2m4-马家沟组四段; εOs-三山子组; O1y-治里组; εOc-炒米店组; ε3g-崮山组; ε2z-张夏组; ε2m-馒头组; Pt1 γ-古元古代花岗岩; Pt2q-滹沱群青石村组
Figure 5. Tectionic section of the Xizhoushan thrust nappe structure
图 6 唐河断裂带剖面图
J3z-张家口组; C-石炭系; εO-寒武—奥陶系; Chg-高于庄组; Ar-太古宙片麻岩
Figure 6. Section of the Tanghe fault zone
图 7 火山岩化学定量分类图解(据李兆鼐等, 1984)
Ⅰ-流纹岩类; Ⅱ-英安岩类; Ⅲa-粗面岩类; Ⅲb-安粗岩类; Ⅳa-安山岩类; Ⅳb-玄武岩和碱性玄武岩类; Ⅴ-响岩类; Ⅵ-碱玄岩类; Ⅶ-副长石岩类; Ⅷ-超镁铁质岩类; ①髫髻山组; ②土城子组; ③张家口组下段; ④张家口组上段; ⑤大北沟组下段; ⑥大北沟组上段; ⑦义县组玄武岩; ⑧义县组流纹岩; ▲永定庄组; 点线为中国火山岩投点的实际范围
Figure 7. Diagram showing the chemical quantitative classification of volcanic rocks
图 8 浑源及灵丘一带燕山期火山岩旋回柱状图(图中厚度代表比例尺)
1-玄武岩; 2-玄武安山岩; 3-玄武质角砾熔岩; 4-安粗岩; 5-粗面岩; 6-流纹质角砾凝灰岩; 7-流纹质火山角砾岩; 8-流纹质火山集块岩; 9-流纹质角砾熔岩; 10-球泡流纹岩; 11-流纹岩; 12-珍珠岩; 13-膨润土矿化层; 14-砂砾岩; 15-砂质泥岩
Figure 8. Columnary sections of Yanshanian volcanic cycles in Hongyuan and Linqiu
图 11 小窝单花岗闪长岩与左云组不整合关系素描
J3Lq-灵丘超单元; K1z-白垩系左云图; J3z-侏罗系张家口组
Figure 11. Unconformity between the Xiaowodan granodiorite and and Zuyun Formation
表 1 侏罗—白垩纪地层划分简表
Table 1. Multipe stratigraphic division of the Jurassic-Cretaceous
表 2 地质事件构造序列
Table 2. Structural sequence of geological events
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