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首页> 外文期刊>Canadian journal of earth sciences >Structural relations between the polydeformed Flin Flon arc assemblage and Missi Group sedimentary rocks, Fun Flon area, Manitoba and Saskatchewan
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Structural relations between the polydeformed Flin Flon arc assemblage and Missi Group sedimentary rocks, Fun Flon area, Manitoba and Saskatchewan

机译：多变形的Flin Flon弧组合与Missi Group沉积岩，Fun Flon地区，曼尼托巴省和萨斯喀彻温省之间的结构关系

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摘要

The structure of the Fun Flon area (Manitoba andSaskatchewan) has been examined through mapping ofmesoscopic and macroscopic structures in both the Ca. 1900 MaFun Flon arc assemblage volcanic basement and theunconformably overlying (or fault juxtaposed) ca. 1845 MaMissi Group continental sedimentary cover sequence. The FlinFlon and Callinan volcanogenic massive sulphide orebodiesoccur within the basalt-dominated basement. The contactbetween the basement and the cover rocks was investigated indetail during this study. The cover sequence records threeprincipal fold- and foliation-forming events. All deformationobserved within the cover sequence is correlative withdeformation observed within the volcanic basement. Significantlow-angle overlap of basement on cover is attributed todevelopment of a D_1 north-verging nappe and subsequentthrust displacement on the overturned basement-cover contact.North-verging D_1 structures provide evidence for a distinctpost-Missi Group deformation event that preceded regional,southwestward D_2 thrusting at peak metamorphic conditionsacross the southeastern Trans-Hudson Orogen. D_2 deformationproduced closed to tight, west-verging overturned folds with awell-developed axial planar cleavage and a pervasive extensionlineation. D_3 deformation generated open folds of the S_2 anda weakly to moderately developed spaced axial planar S_3cleavage. D_3 and D_4 deformations produced sinistral-oblique,brittle-ductile reverse faults that offset all older features.
机译：通过对Ca中的中观和宏观结构进行制图，研究了Fun Flon地区（曼尼托巴和萨斯喀彻温省）的结构。 1900年MaFun Flon弧形组合火山岩基底及其上不整合的上覆（或断层并列）。 1845年MaMissi组大陆沉积覆盖层序。 FlinFlon和Callinan火山成矿块状硫化物矿床发生在以玄武岩为主的地下室中。在这项研究中，详细研究了地下室和覆盖岩之间的接触。覆盖序列记录了三个主要的折叠和叶形成事件。在覆盖层序列内观察到的所有变形都与在火山基底内观察到的变形有关。地下室与盖层的明显低角度重叠归因于D_1向北推覆的推覆的发展以及随后在倾覆的基底-盖层接触上的推力位移。北向D_1结构提供了明显的米西后群变形事件的证据，该变形事件发生在区域西南D_2之前在整个东南部的哈德逊造山带上经历了峰值变质条件的逆冲。 D_2变形产生了密闭，向西翻转的褶皱，并具有发育良好的轴向平面裂隙和普遍的伸展线。 D_3变形产生了S_2的开裂褶皱，并产生了弱到中等程度发展的轴向S_3劈裂。 D_3和D_4变形产生了左斜斜，脆性延性的反向断裂，抵消了所有较旧的特征。

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