The Shahrak intrusive body (SIB) occurs at the intersection of the Urumieh–Dokhtar Volcanic Belt and the Sanandaj–Sirjan metamorphic belt in northwest Iran. This intrusive body consists of granodiorite, monzonite, monzodiorite, and monzogabbro, that intruded Oligo‐Miocene sedimentary units and Cretaceous and Precambrian metamorphic rocks. Iron mineralization has occurred as magnetite skarn with hematite and pyrite in calcareous units at the contact with the SIB. The Rb–Sr age dating shows that the age of the SIB is about 24.9 Ma (Chattian). Whole rock geochemical studies indicate that the magma has calc‐alkaline to high‐K calc‐alkaline affinities and is metaluminous. The multi‐elements spider diagrams normalized to chondrite and primitive mantle show significant enrichment of light rare earth element against heavy rare earth element and depletion of Ti, P, Ta, and Nb, indicating characteristic features of the volcanic arc rocks in a subduction setting. Furthermore, the various types of tectonomagmatic diagrams show that these rocks are generated in an active continental margin. The parental magma of the rocks probably originated from an enriched mantle on the basis of the geochemistry of the REE elements. The average Sr isotopic composition of the SIB is ⁸⁷Sr/⁸⁶Sr(i) = 0.706. Therefore, the parent magma of the SIB may be the result of partial melting of enriched mantle or subducted slab contaminated with the continental crust. The sulfur isotope composition of pyrite grains (ave., +5.29 ‰) in the Korkora‐1 iron deposit indicates that the sulfides are formed from magma or due to in situ dissolution and leaching of igneous sources. Dehydration melting of the subducted part of oceanic crust has likely produced the fluids that are necessary for melting of the mantle wedge to produce mafic‐intermediate melts. The generated melts penetrated into the crust, and during their ascent they underwent a little crustal contamination and eventually were emplaced as intrusive bodies comprising gabbrodiorite to granodiorite.

中文翻译：

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伊朗西北部Shahrak侵入体及相关铁矿化（塔卡布东部）的地球化学描述和硫同位素数据

Shahrak侵入体（SIB）发生在伊朗西北部的Urumieh–Dokhtar火山带和Sanandaj–Sirjan变质带的交汇处。该侵入体由花岗闪长岩，蒙脱石，单晶闪闪石和单闪藻组成，它们侵入了中新世沉积单元以及白垩纪和前寒武纪变质岩。在与SIB接触时，钙质单元中的赤铁矿，赤铁矿和黄铁矿是磁铁矿矽卡岩中的铁矿化。Rb–Sr年龄测年表明，SIB的年龄约为24.9 Ma（Chattian）。整个岩石地球化学研究表明，该岩浆具有钙碱性至高钾钙碱性的亲和力，并且是金属元素。规范化为球粒陨石和原始地幔的多元素蜘蛛图显示出轻稀土元素相对于重稀土元素的显着富集以及Ti，P，Ta和Nb的消耗，表明了俯冲环境中火山弧岩的特征。此外，各种构造构造图表明这些岩石是在活跃的大陆边缘产生的。在稀土元素的地球化学基础上，岩石的母岩浆可能起源于富集的地幔。SIB的平均Sr同位素组成为 在稀土元素的地球化学基础上，岩石的母岩浆可能起源于富集的地幔。SIB的平均Sr同位素组成为 在稀土元素的地球化学基础上，岩石的母岩浆可能起源于富集的地幔。SIB的平均Sr同位素组成为⁸⁷ Sr / ⁸⁶ Sr（i）= 0.706。因此，SIB的母岩浆可能是富集地幔或被大陆壳污染的俯冲板块部分融化的结果。Korkora-1铁矿床中黄铁矿晶粒（平均+5.29‰）的硫同位素组成表明，硫化物是由岩浆形成的，或者是由于火成岩原位溶解和浸出形成的。大洋地壳俯冲部分的脱水融化可能产生了地幔楔融化产生镁铁质中间融解所必需的流体。产生的熔体渗透到地壳中，在上升过程中受到了一点地壳污染，最终被放置成包含辉闪闪长石到花岗闪长岩的侵入体。