伊夫代尔辉长岩-闪长岩-花岗闪长岩复合体(北乌拉尔)的矿物学、流体机制和潜在矿石含量

V. V. Kholodnov, E. S. Shagalov, G. A. Petrov
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In addition, the geodynamic setting of this period was clarified, along with the composition, possible position of the primary mantle source, and the features of its fluid regime. Results. It was established that the mafic rocks (dolerites) in the Ivdel complex correspond to derivatives of the depleted mantle, with a primary source close to N-MORB basalts. The connection between the source and the separation of the slab and the “mantle window” located under the frontal zone of the former East Tagil island arc was substantiated. Such a position of the melting chamber determines the primary weak water saturation of dolerite magmas and their redox regime. According to mineralogical data, this feature is further manifested in the formation of the entire series of rocks of the Ivdel complex (with an increase in the iron index of clinopyroxenes and amphiboles, an increase in titanium contents in titanomagnetite, and other data). 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引用次数: 0

摘要

研究课题。北乌拉尔东塔吉尔构造形成带泥盆纪岛弧序列中常见的辉长岩-辉绿岩-闪长岩-花岗闪长岩组成的超基性侵入体。这些岩体的年代为泥盆纪晚期-石炭纪早期,属于连续分异后的伊夫代尔复合体。材料和方法。使用 SX-100 显微分析仪研究了这些侵入体的成岩矿物和附属矿物的成分。这使得获得有关其形成条件、流体机制特征和潜在矿石含量的新数据成为可能。此外,还澄清了这一时期的地球动力环境,以及原生地幔源的成分、可能位置及其流体机制特征。结果。研究证实,伊夫代尔岩群中的岩浆岩(辉绿岩)是贫化地幔的衍生物,其主要来源接近 N-MORB 玄武岩。该来源与板块分离和位于前东塔吉尔岛弧正面带下的 "地幔窗口 "之间的联系得到了证实。熔化室的位置决定了辉绿岩岩浆的主要弱水饱和度及其氧化还原机制。根据矿物学数据,这一特征在伊夫代尔复合体全系列岩石的形成过程中得到了进一步体现(挛辉石和闪石的铁指数增加,钛磁铁矿中的钛含量增加,以及其他数据)。当岩浆向上移动到地球表面时,岩浆发生了进一步的演变(从辉绿岩到单斜辉绿岩、石英闪长岩和花岗闪长岩),这反映了超俯冲岛弧物质对分化熔体的污染日益严重。这种复合岩的另一个重要岩石学特征是它是在富含氯的岩浆流体的参与下形成的。根据侵入熔体的成分、水含量、氯含量和氧活度的不同,形成了许多独立的脱气流体-岩浆系统。这些系统的特点是,在铁-氯流体的参与下,岩浆后自动脱气过程具有明显的特征。根据挥发物(卤素、水和氧)的情况,这种自流岩浆-岩浆系统共同隶属于钛磁铁矿铁成岩(G.B. Fershtater 认为),这决定了它们的一般成矿特异性和潜在矿石含量。此类流体-岩浆系统中挥发物的清除可能伴随着叶绿素矿石元素从结晶熔体向侵入体外接触面的提取和转移。如果存在有利于流体的迁移带(断层、破碎带等)和地球化学屏障(特别是存在有利于围岩的含硫化物岛弧地层),这可能会促进热液-金属矿化(铜、锌、金、钼等)的形成。侵蚀过程中形成的此类含矿带可能是该地区已知块矿的主要金源。伊夫代尔复合体的大块辉长岩可能有希望成为高钛磁铁矿-钛铁矿矿化区。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Mineralogy, fluid regime and potential ore content of the post-accretion Ivdel gabbrodolerite-monzonite-granodiorite complex (Northern Urals)
Research subject. Hypabyssal intrusive bodies of a gabbro-dolerite-monzonite-granodiorite composition, common among the Devonian island-arc sequences of the East Tagil structural-formational zone in the Northern Urals. These bodies are dated as the Late Devonian-Early Carboniferous and attributed to the post-accretionary continuously differentiated Ivdel complex. Material and methods. The composition of rock-forming and accessory minerals of these intrusive bodies was studied using an SX-100 microanalyzer. This made it possible to obtain new data on the conditions of their formation, features of the fluid regime, and potential ore content. In addition, the geodynamic setting of this period was clarified, along with the composition, possible position of the primary mantle source, and the features of its fluid regime. Results. It was established that the mafic rocks (dolerites) in the Ivdel complex correspond to derivatives of the depleted mantle, with a primary source close to N-MORB basalts. The connection between the source and the separation of the slab and the “mantle window” located under the frontal zone of the former East Tagil island arc was substantiated. Such a position of the melting chamber determines the primary weak water saturation of dolerite magmas and their redox regime. According to mineralogical data, this feature is further manifested in the formation of the entire series of rocks of the Ivdel complex (with an increase in the iron index of clinopyroxenes and amphiboles, an increase in titanium contents in titanomagnetite, and other data). Further evolution of magmas (from dolerites to monzonites, quartz diorites, and granodiorites) occurred as they moved upward to the Earth’s surface and reflected the increasing contamination of differentiated melts by suprasubduction island-arc matter. Another important petrological feature of this complex is its formation with the participation of a chlorine-rich magmatogenic fluid. Depending on the composition of intruding melts, their contents of water, chlorine and oxygen activity, a number of autonomous degassing fluid-magmatic systems are formed. These systems are characterized by noticeable features in the processes of post-magmatic autometasomatosis, with the participation of an iron-chloride fluid. According to the regime of volatiles (halogens, water, and oxygen), the common affiliation of such autonomous fluid-magmatic systems to titanomagnetite ferrofacies (according to G.B. Fershtater), determines both their general metallogenic specialization and potential ore content. The removal of volatiles from such fluid-magmatic systems could be accompanied by extraction and transfer of chlorophyll ore elements from crystallizing melts to exocontacts of intrusive bodies. This, in the presence of migration zones favorable for fluids (faults, crushing zones, etc.) and geochemical barriers (especially in the presence of favorable enclosing sulfide-bearing island-arc strata), could have contributed to the formation of hydrothermal-metasomatic ore mineralization (Cu, Zn, Au, Mo and etc.). Such ore-bearing zones during erosion could be the primary source of gold for the known placers of this region. Large bodies of gabbrodolerites of the Ivdel complex may be promising for high-Ti magnetite-ilmenite mineralization.
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