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Sequential magma injection with a wide range of mixing and mingling in Late Jurassic plutons, southern Ghorveh, western Iran
Journal of Asian Earth Sciences ( IF 3 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.jseaes.2020.104469
Hossein Azizi , Yoshihiro Asahara , Masayo Minami , Ryo Anma

Abstract Intrusive bodies with a wide-ranging geology are distributed in the central part of the Sanandaj-Sirjan zone (C–SaSZ) in southern Ghorveh, western Iran. The zircon U–Pb ages were dated at 154–146 Ma, and were characterized by low 87Sr/87Sr(i) ratios and high 143Nd/144Nd(i) ratios that ranged from 0.7035 to 0.7061 and 0.51245 to 0.51271, respectively (positive eNd(t) values). Magma differentiation and mixing formed different magmatic rocks that range widely from gabbro to granite in the Meiham–Shirvaneh area in southern Ghorveh. However, there was no clear evidence to support the slab role for the enrichment of large-ion lithophile elements (LILEs) and light rare–earth elements (LREEs) in this area. Meanwhile, there is a possibility that some ocean island basalt-like melt, which has been reported in the Ghorveh area for the same period, was involved in the minor enrichment of LILEs and LREEs. The high development of the released depleted mantle melts, with a minor role played by crustal components, accelerated the thinning of the continental crust in an extensional regime such as continental rift in the C–SaSZ during the Jurassic. This rift was responsible for the sequential injection of mafic magma with a wide range of magma mixing and mingling in southern Ghorveh during the Late Jurassic. As a result, we observed a wide range of intrusive rocks from gabbro to granite with different compositions, which included some clear mixing and hybrid textures. This finding demonstrated how the released mantle melt formed a thicker crust in western Iran.

中文翻译:

伊朗西部 Ghorveh 南部晚侏罗世岩体中大范围混合和混合的连续岩浆注入

摘要 在伊朗西部 Ghorveh 南部的 Sanandaj-Sirjan 带 (C-SaSZ) 中部分布着地质范围广泛的侵入体。锆石 U-Pb 年龄为 154-146 Ma,其特征是 87Sr/87Sr(i) 比值低,143Nd/144Nd(i) 比值高,范围分别为 0.7035 至 0.7061 和 0.51242 至 0.51N(正值分别为 0.51242 至 0.51N)。 (t) 值)。在 Ghorveh 南部的 Meiham-Shirvaneh 地区,岩浆分异和混合形成了从辉长岩到花岗岩的不同岩浆岩。然而,没有明确的证据支持在该地区富集大离子亲石元素(LILEs)和轻稀土元素(LREEs)的平板作用。同时,Ghorveh 地区也有可能出现同期报道的一些洋岛玄武岩状熔体,参与了 LILEs 和 LREEs 的少量富集。释放的耗尽地幔熔体的高度发展,加上地壳成分的次要作用,加速了侏罗纪C-SaSZ大陆裂谷等伸展制度中大陆地壳的减薄。该裂谷导致了晚侏罗世期间在 Ghorveh 南部连续注入基性岩浆和范围广泛的岩浆混合和混合。因此,我们观察到了从辉长岩到花岗岩的各种不同成分的侵入岩,其中包括一些清晰的混合和混合纹理。这一发现证明了释放的地幔熔体如何在伊朗西部形成更厚的地壳。地壳成分起次要作用,加速了侏罗纪 C-SaSZ 大陆裂谷等伸展状态下大陆地壳的减薄。该裂谷导致了晚侏罗世期间在 Ghorveh 南部连续注入基性岩浆和范围广泛的岩浆混合和混合。因此,我们观察到了从辉长岩到花岗岩的各种不同成分的侵入岩,其中包括一些清晰的混合和混合纹理。这一发现证明了释放的地幔熔体如何在伊朗西部形成更厚的地壳。地壳成分起次要作用,加速了侏罗纪 C-SaSZ 大陆裂谷等伸展状态下大陆地壳的减薄。该裂谷导致了晚侏罗世期间在 Ghorveh 南部连续注入基性岩浆和范围广泛的岩浆混合和混合。因此,我们观察到了从辉长岩到花岗岩的各种不同成分的侵入岩,其中包括一些清晰的混合和混合纹理。这一发现证明了释放的地幔熔体如何在伊朗西部形成更厚的地壳。该裂谷导致了晚侏罗世期间在 Ghorveh 南部连续注入基性岩浆和范围广泛的岩浆混合和混合。因此,我们观察到了从辉长岩到花岗岩的各种不同成分的侵入岩,其中包括一些清晰的混合和混合纹理。这一发现证明了释放的地幔熔体如何在伊朗西部形成更厚的地壳。该裂谷导致了晚侏罗世期间在 Ghorveh 南部连续注入基性岩浆和范围广泛的岩浆混合和混合。因此,我们观察到了从辉长岩到花岗岩的各种不同成分的侵入岩,其中包括一些清晰的混合和混合纹理。这一发现证明了释放的地幔熔体如何在伊朗西部形成更厚的地壳。
更新日期:2020-09-01
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