A 90° change in stress orientation has been previously proposed as the trigger for the final emplacement of the world-class Norilsk-Talnakh magmatic sulfide mineralization via the migration of accumulated sulfide melts from elsewhere within the plumbing system of the Siberian Traps large igneous province (LIP). We propose that this stress change does not require and was not triggered by a distal change in plate boundary stresses, but instead can be explained both temporally and spatially by stress changes recorded in the dike swarm patterns of the Siberian Traps LIP, namely the transition from a giant radiating dike swarm (associated with mantle plume uplift) to a giant circumferential swarm (linked to flattening of the plume head). The mantle plume stress-related changes recorded by these dike swarms, rather than distal plate boundary stress changes, were therefore most likely the trigger for the emplacement of the Norilsk-Talnakh mineralization. Other LIPs that have both giant radiating and circumferential dike swarms most likely reflect similar major and rapid changes in stress orientation, indicating that mantle plume-induced stress changes revealed by dike swarms should be considered an additional tool in magmatic sulfide exploration.

中文翻译：

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羽流产生的 90° 应力变化与西伯利亚圈闭大型火成岩省的辐射状辉绿岩墙群的转变以及 NORILSK-TALNAKH 矿床的侵位有关

先前曾提出，应力方向的 90° 变化将作为世界级诺里尔斯克-塔尔纳赫岩浆硫化物矿化最终就位的触发因素，这是通过西伯利亚陷阱大型火成岩省管道系统内其他地方积累的硫化物熔体的迁移而实现的。唇）。我们认为，这种应力变化不需要板块边界应力的远端变化，也不是由板块边界应力的远端变化触发的，而是可以通过西伯利亚圈闭LIP的堤坝群模式中记录的应力变化在时间和空间上进行解释，即从一个巨大的辐射岩脉群（与地幔柱的隆起有关）到一个巨大的圆周群（与地幔柱头部的扁平化有关）。因此，这些岩脉群记录的与地幔柱应力相关的变化，而不是远端板块边界应力的变化，最有可能触发诺里尔斯克-塔尔纳赫矿化的侵位。其他同时具有巨大辐射和环向岩脉群的 LIP 最有可能反映了类似的应力方向的重大和快速变化，这表明岩脉群揭示的地幔柱引起的应力变化应被视为岩浆硫化物勘探中的附加工具。