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首页> 外文期刊>South African journal of geology >The Klondike steep structure, Okiep Copper District, South Africa
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The Klondike steep structure, Okiep Copper District, South Africa

机译：南非奥基普铜矿区的克朗代克陡峭构造

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The Okiep Copper District is part of the Mesoproterozoic Namaqua Metamorphic Province of the Northern Cape, South Africa. The Klondike steep structure is developed in the c. 1100 Ma Nababeep Gneiss north of Okiep and it contains a number of basic bodies, some of which contain sulphide mineralization. The steep structure is essentially a ductile shear affecting the regional S_2 fabric and it displays a complicated deformational history linked to the syntectonic emplacement of the basic bodies during D_3 horizontal shortening. The steep structure may have been initiated as shears at the tip of large-scale cusps which developed in response to horizontal shortening of a lower crustal mafic magma chamber. It was modified by the migrating basic magma which rose up through the crust from these cusps, eventually solidifying into stationary basic bodies. Intrusion morphology was controlled by fractures which developed in response to rapid strain rates associated with magma injection. The largest basic body along the Klondike steep structure solidified within 100 years of emplacement. Modification of the Klondike steep structures took place due to synchronous horizontal shortening of the country rocks at lower regional strain rates, resulting in zones of contact strain around the competent basic bodies. In essence, the Copper District is a section through the middle crust where syntectonic basic intrusions became frozen into position during their ascent.
机译：奥基普铜矿区是南非北开普省中元古生界纳马夸变质省的一部分。克朗代克陡峭的结构在c。奥基普以北的1100 Ma Nababeep片麻岩，它包含许多基体，其中一些包含硫化物矿化作用。陡峭的结构本质上是影响区域S_2织物的韧性剪切，它显示出复杂的变形历史，与D_3水平缩短过程中基体的对位构造有关。陡峭的结构可能是由于大尖峰尖端的剪切而引发的，该剪切是响应于下部地壳镁铁质岩浆室水平缩短而形成的。它被迁移的基本岩浆所修饰，这些岩浆从这些尖点穿过地壳上升，最终凝固成静止的基体。侵入形态受到裂缝的控制，这些裂缝是响应岩浆注入相关的快速应变速率而形成的。克朗代克陡峭结构中最大的基体在就位100年后固化。克朗代克陡峭结构的变型是由于乡村岩石在较低的区域应变率下同步水平缩短造成的，从而导致了主管基体周围的接触应变区域。本质上，铜区是中地壳的一个部分，构造上的基本侵入在上升过程中被冻结到位。

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