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首页> 外文期刊>Journal of Asian earth sciences >~(40)Ar/~(39)Ar age and geochemistry of the post-collisional Miocene Yamadag volcanics in the Arapkir area (Malatya Province), eastern Anatolia, Turkey
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~(40)Ar/~(39)Ar age and geochemistry of the post-collisional Miocene Yamadag volcanics in the Arapkir area (Malatya Province), eastern Anatolia, Turkey

机译：土耳其安那托利亚东部Arapkir地区（马拉蒂亚省）碰撞后的中新世Yamadag火山的〜（40）Ar /〜（39）Ar年龄和地球化学

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摘要

The Neogene Yamadag volcanics occupy a vast area between Sivas and Malatya in eastern Anatolia, Turkey. These volcanic rocks are characterized by pyroclastics comprising agglomerates, tuffs and some small outcrops of basaltic-andesitic-dacitic rocks, overlain upward by basaltic and dacitic rocks, and finally by basaltic lava flows in the Arapkir area, northern Malatya Province. The basaltic lava flows in the Arapkir area yield a ~(40)Ar/~(39)Ar age of 15.8 ± 0.2 Ma, whereas the dacitic lava flows give ~(40)Ar/~(39)Ar ages ranging from 17.6 through 14.7 ±0.1 to 12.2 ± 0.2 Ma, corresponding to the Middle Miocene. These volcanic rocks have subalkaline basaltic, basaltic andesitic; alkaline basaltic trachyandesitic and dacitic chemical compositions. Some special textures, such as spongy-cellular, sieve and embayed textures; oscillatory zoning and glass inclusions in plagioclase phenocrysts; ghost amphiboles and fresh biotite flakes are attributable to disequilibrium crystallization related to magma mixing between coeval magmas. The main solidification processes consist of fractional crystallization and magma mixing which were operative during the soldification of these volcanic rocks. The dacitic rocks are enriched in LILE, LREE and Th, U type HFSE relative to the basaltic rocks. The basaltic rocks also show some marked differences in terms of trace-element and REE geochemistry; namely, the alkaline basaltic trachyandesites have pronounced higher HFSE, MREE and HREE contents relative to the subalkaline basalts. Trace and REE geochemical data reveal the existence of three distinct magma sources - one subalkaline basaltic trachyandesitic, one alkaline basaltic and one dacitic - in the genesis of the Yamadag volcanics in the Arapkir region. The subalkaline basaltic and alkaline basaltic trachyandesitic magmas were derived from an E-MORB type enriched mantle source with a relatively high- and low-degree partial melting, respectively. The magmatic melt of dacitic rocks seem to be derived from an OIB-type enriched lithospheric mantle with a low proportion of partial melting. The enriched lithospheric mantle source reflect the metasomatism induced by earlier subduction-derived fluids. All these coeval magmas were generated in a post-collisional extensional geodynamic setting in Eastern Anatolia, Turkey.
机译：Neogene Yamadag火山占据了土耳其安那托利亚东部Sivas和Malatya之间的广阔地区。这些火山岩的特征是火山碎屑岩，包括团块，凝灰岩和一些小片的玄武岩-安山岩-达吉特岩露头，上面覆盖着玄武岩和大晶石岩，最后是马拉提亚省北部Arapkir地区的玄武岩熔岩流。 Arapkir地区的玄武岩熔岩流的〜（40）Ar /〜（39）Ar年龄为15.8±0.2 Ma，而Dacitic熔岩流的〜（40）Ar /〜（39）Ar年龄范围为17.6至14.7±0.1至12.2±0.2 Ma，对应于中新世。这些火山岩具有碱性以下的玄武岩，玄武质的安山岩。碱性玄武岩和山竹的化学成分。一些特殊的纹理，例如海绵状，筛状和巢状纹理；斜长石斑晶中的振荡带和玻璃包裹体；鬼角闪石和新鲜的黑云母薄片归因于与前浆岩浆混合的岩浆有关的不平衡结晶。主要的固化过程包括分步结晶和岩浆混合，这些过程在这些火山岩的成岩作用中起作用。相对于玄武岩，高铁岩中富含LILE，LREE和Th，U型HFSE。玄武岩在痕量元素和稀土元素地球化学方面也显示出明显的差异。也就是说，碱性玄武质菱锰矿相对于碱式玄武岩具有较高的HFSE，MREE和HREE含量。痕量和稀土元素地球化学数据揭示了在阿拉普基尔地区Yamadag火山的成因中存在三种不同的岩浆源-一种为碱碱性玄武岩，一种为碱性玄武岩，另一种为Datictic。亚碱性玄武质和碱性玄武质安山岩浆岩浆分别来自E-MORB型富集地幔源，分别具有相对较高和较低程度的部分熔融。 datictic岩的岩浆熔岩似乎来自OIB型富集的岩石圈地幔，具有较低的部分熔岩比例。丰富的岩石圈地幔源反映了较早的俯冲作用衍生的流体引起的交代作用。所有这些近代岩浆都是在土耳其东部安纳托利亚的碰撞后伸展地球动力学环境中产生的。

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