Abstract The Kuh-e-Shah complex includes the Paleogene volcano-plutonic belt of the Lut Block, eastern Iran. The volcanic rocks which outcropped in this complex mainly consist of trachy-andesites, andesites, and basaltic-andesites that mineralogically contain plagioclase, pyroxene, hornblende, and minor biotite and olivine. Geochemically, they have features typical of high-K calc-alkaline to shoshsonitic magmas with enrichment in large ion lithophile elements (LILE), and depletion in high field strength elements (HFSE) and heavy rare earth elements (HREE). Chondrite-normalized REE plots show enrichment in light REE (4.9 Pb dating indicates an age of 38.6 to 38.9 Ma for volcanic rocks (Late Eocene, Bartonian). Initial 87Sr/86Sr and 143Nd/144Nd ratios (0.704350–0.704820 and 0.512619–0.512779, resp.), are compatible with parental melts formation in a subduction mantle wedge. The ɛNdi values (+0.60 to +3.73) are in the range of mantle-derived melts. We suggest that volcanic rocks of the Lut Block are part of the Paleogene volcanism resulted from the Sistan oceanic crust subduction under the Lut Block during the Cretaceous.

中文翻译：

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Kuh-e-Shah 火山岩的地球化学、岩石成因、锆石 U Pb 年代学和 Sr Nd 同位素组成：对古近纪期间活动大陆边缘以及伊朗东部的影响

摘要 Kuh-e-Shah杂岩包括伊朗东部Lut地块的古近系火山-深成岩带。该杂岩体中出露的火山岩主要由粗安山岩、安山岩和玄武安山岩组成，矿物学上含有斜长石、辉石、角闪石和少量黑云母和橄榄石。从地球化学上看，它们具有典型的高钾钙碱性到软变质岩浆的特征，富含大离子亲石元素（LILE），缺乏高场强元素（HFSE）和重稀土元素（HREE）。球粒陨石归一化 REE 图显示轻 REE 富集（4.9 Pb 测年表明火山岩（晚始新世，巴托阶）的年龄为 38.6 至 38.9 Ma。初始 87Sr/86Sr 和 143Nd/144Nd 比率（0.704350-0.704350-0.701957209 和 50478209）分别），与俯冲地幔楔中的母体熔体形成相容。ɛNdi 值（+0.60 至 +3.73）在地幔衍生熔体的范围内。我们认为Lut 地块的火山岩是白垩纪Lut 地块下锡斯坦洋壳俯冲造成的古近系火山作用的一部分。