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首页> 外文期刊>Journal of African earth sciences >Petrogenesis of Dehsard felsic rocks in the southwest of Kerman, Iran: Inference for the evolution of Sanandaj-Sirjan zone
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Petrogenesis of Dehsard felsic rocks in the southwest of Kerman, Iran: Inference for the evolution of Sanandaj-Sirjan zone

机译：伊朗克尔曼西南部Dehsard Felsic Rocks的培养灵性：桑达省Sirjan区演变的推理

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The Upper Triassic Dehsard felsic rocks (DFR), leucocratic to hololeucocratic granitic rocks, are exposed in the southernmost of the Phanerozoic Sanandaj-Sirjan zone in the Zagros orogenic belt of south-Central Iran. They intruded into the Paleozoic Khabr and Rutchun metamorphic complexes that consist of marble, greenschist, calcschist and micaschist rocks. The DFR are cut through by monzonitic and dioritic dikes. Comprehensive petrological and geochemical studies disclosed DFR as a plagiogranite. They are calc-alkaline, metaluminous to slightly peraluminous I-type granitoids and exhibit enrichment in large ion lithophile elements (LILEs; e.g. Na, K, Rb, Ba) in contrast to the depletion of high field strength elements (HFSEs; e.g. Nb, Ta, P, Ti). Their chondrite normalized REE patterns show LREE enrichment [(La/Yb)(N) = 4.41-23.77] and unfractionated HREE [(Gd/Yb)(N) = 0.60 to 2.23] that suggest the lack of garnet during partial melting processes. The positive Eu anomalies advocate plagioclase accumulation. The low Nb, Ta, P2O5, TiO2 content, isotopic data, LREEs enrichment, various tectono-magmatic discrimination diagrams may point out the formation of DFR in a mature island arc environment through partial melting of metabasic source with contribution of some greywacke sediments and subduction-related volatiles. The partial melting occurred above garnet stability field. The involvement of variable amounts of oceanic sedimentary rocks especially greywackes in the melting processes in a mature island arc setting, as characterised by epsilon Ndt results ranging from +0.93 to -5.19 at 220 Ma, could also cause the DFR inclination toward active continental margin environment. It seems that the development of an island arc in an intra-oceanic setting must be happened prior to the Late Jurassic-Early Cretaceous time, while northward subduction of Neotethys oceanic crust was in progress under southern margin of the Central Iranian Microcontinents. Subsequent collision of the island arc with SSZ led to the tectonic proximity of the DFR into SSZ constituents. This approach gives us new intuition for the renovation of the geodynamic history of Sanandaj-Sirjan zone.
机译：上部三叠纪的Dehsard Felsic Rocks（DFR），人民对全龙掌覆盖物，暴露在伊朗Zagros Orensenic皮带的北古佐科萨曼省南部南部的最南端。他们侵入了古生代Khabr和rutchun变质复合物，由大理石，绿色植物，考验和云母岩石组成。 DFR被蒙扎塞和Dioritic Dikes剪掉。综合思科和地球化学研究公开了DFR作为斑岩。它们是钙碱，金属滤光剂略微衰弱的I型花岗岩，与大离子型锂锂尼元素（Liles;例如Na，K，Rb，Ba）进行富集，与高场强度元素的耗竭（HFSES;例如Nb， ta，p，ti）。它们的核心归一化REE模式显示嗜好富集[（la / yb）（n）= 4.41-23.77]和未分割的hree [（gd / yb）（n）= 0.60至2.23]，表明部分熔化过程中缺乏石榴石。正面欧盟异常倡导Plagioclase积累。低Nb，Ta，p2O5，TiO2含量，同位素数据，浓缩，各种构图 - 岩浆鉴别图可能指出通过偏熔点的群体融合，以一些灰度沉积物和俯冲的贡献来指出成熟岛弧环境中的DFR的形成 - 相关的挥发物。部分熔化发生在石榴石稳定场上。随变量的海洋沉积岩尤其是成熟岛弧形环境中熔化过程中的灰度般的灰度，如εnsilonndt结果的特征在于220 ma，也可能导致DFR倾向于有源大陆边缘环境。似乎在侏罗纪早期的白垩纪的晚期白垩纪时，必须发生在海洋环境中的岛屿弧的发展，而伊朗氏体微观南部的南部边缘正在进行Neotethys海洋地壳的北部俯冲。岛弧与SSZ的后续碰撞导致DFR进入SSZ成分的构造附近。这种方法为我们提供了新直觉，为Sanandaj-Sirjan区的地磁历史进行了翻新。

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