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首页> 外文期刊>地質学雑誌 >北部九州,白亜紀香春花崗閃綠岩牛斬山岩体(牛斬山花崗閃綠岩)のマグマ過程と成因
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北部九州,白亜紀香春花崗閃綠岩牛斬山岩体(牛斬山花崗閃綠岩)のマグマ過程と成因

机译：北部九州,白亜纪香春花岗闪绿岩牛斩山岩体(牛斩山花岗闪绿岩)のマグマ过程と成因

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摘要

The Cretaceous Ushikiri-yama granodiorite is exposed in the northern part of Tagawa city (Fukuoka Prefecture, SW Japan) and is part of the North Kyushu batholith. Three types of dikes with varying compositions are associated with the Ushikiri-yama granodiorite: porphyritic fine-grained diorite (Pr Fine Di), porphyritic finegrained tonalite (Pr Fine To), and porphyritic fine-grained granite (Pr Fine Gr). The granodiorite intrudes the pre-Cretaceous basement rocks as an isolated stock, which can be divided into two bodies (North and South bodies), separated by a fine-grained granodiorite unit with a hypidiomorphic granular texture. The South body, which contains magmatic epidote, was intruded by the North body. Higher initial Sr isotope ratios of the South body, relative to the North body, indicate that sedimentary rocks were assimilated in the magma of the South body during its emplacement in the middle/upper crust. Geochemical data indicate that the Pr Fine To resulted from mixing of the magmas that produced the South body and the Pr Fine Di, with minor crustal contamination by host sedimentary rocks. Fractional crystallization of plagioclase,biotite,and hornblende in the South body resulted in the differentiation of the evolved Pr Fine Gr. In addition, Pr Fine Di has a sanukitic high-Mg andesite composition that is similar to Cretaceous high-Mg diorite bodies from the North Kyushu batholith. Overall, the results indicate that a variety of igneous processes including magma mixing, fractional crystallization, and assimilation with the host rocks, were responsible for the formation of the Ushikiri-yama granodiorite.
机译：白垩纪乌希卡里 - 玉马Granodiorite暴露在塔瓦市北部（福冈县，SW日本），是北九州斯塔利斯的一部分。具有不同组成的三种类型的堤坝与Ushikiri-yama Granodiorite相关：卟啉细粒粒子（Pr Fine Di），卟啉精细的铜矿（Pr Fine To）和卟啉细粒状花岗岩（Pr Fine Gr）。 Granodiorite侵入了前白垩纪的地下室岩石作为孤立的库存，其可分为两个体（北部和南方身上），由细粒粒细胞单元分开，具有次粒粒状纹理。包含魔法仓流的南方身被北方侵入。相对于北方身体的南方初始初始SR同位素比表明在中/上地壳的施加过程中，沉积岩在南方岩体中被同化。地球化学数据表明，PROMEDED源于制作南方体和PR FINE DI的岩浆混合，由宿主沉积岩石进行轻微的地壳污染。南方氏菌属，生物素和角毛板的分数结晶导致进化PR细胞的分化。此外，Pr Fine DI具有Sanukitic High-Mg和丝岩组合物，其类似于来自北九州浴池的白垩纪高镁硫矾体。总体而言，结果表明，与宿主岩石的岩浆混合，分级结晶和同化包括岩浆混合，分数结晶和同化的各种火油过程负责亚希基岛玉米甘蓝罗石。

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