岩浆作用过程在日本海冲东乡岛的长石中形成萤石排列的置换纹理

IF 1 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Island Arc Pub Date : 2024-01-08 DOI:10.1111/iar.12509
Satoshi Nakano, Kuniaki Makino
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引用次数: 0

摘要

使用电子微探针分析仪、扫描电子显微镜、透射电子显微镜和阴极发光仪器,对冲古岛砂岩中三元碱性长石的内部微观结构进行了研究,以加深对与长石结晶有关的碱性岩浆的火山过程的了解。所考察的砂岩是冲古-多哥上新世砂岩群的一种演化岩。它的表晶长石通常伴有尺度约为 100 纳米到数百微米的片状波浪域纹理,这些纹理显示出复杂而渐进的成分变化:然而,在其他冲古谷碱性岩中常见的反拉帕基维分带纹理在该砂岩中几乎完全不存在。这些纹理是由演化岩浆中逐渐推进的广泛岩浆离子交换置换反应产生的。特征性的编织萤石排列与表晶长石中的片状波浪域纹理一致,类似的编织排列也出现在具有复杂微观纹理的基质长石中。大多数萤石晶粒的直径为 100 nm,个别长石的萤石编织排列模式差异很大。长石微观结构的整体出现代表了在干燥(相对无水)的岩浆中逐步推进的扩散控制置换反应的一个极端例子。形成长石中萤石排列的遗传过程与岩浆成分(尤其是 F 和 P 含量)以及含 F 矿物(尤其是氟磷灰石)的结晶有关。
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Magmatic processes forming replacement textures with fluorite alignments in feldspars in an evolved trachyte from Oki-Dogo Island, Sea of Japan

Internal microtextures of ternary alkali feldspars in sanidine trachyte from Oki-Dogo Island were examined using an electron microprobe analyzer, a scanning electron microscope, a transmission electron microscope and cathodoluminescence instruments, to develop the understanding of volcanic processes of alkaline magmas related to feldspar crystallization. The examined trachyte is an evolved rock of the Oki-Dogo Pliocene trachyte group. Its phenocryst feldspars are commonly associated with lamellar-wavy-domain textures with scales approximately from 100 nm up to several hundreds of μm that show complex and gradual variations in composition: however, anti-rapakivi zoning textures common in other Oki-Dogo alkaline rocks are almost completely absent in the trachyte. These textures are produced by extensive magmatic ion-exchange replacement reactions progressively advanced in the evolved magma. Characteristic braided fluorite alignments are developed consistently with lamellar-wavy-domain textures in phenocryst feldspars, and similar braided alignments are also present in groundmass feldspars with complicated microtextures. Most of fluorite grains are <100 nm in diameter, and the patterns of braided fluorite alignments vary greatly in individual feldspars. The whole occurrence of the feldspar microtextures represents an extreme example of diffusion-controlled replacement reactions, progressively advanced in the dry (relatively anhydrous) trachyte magma. The genetic processes forming fluorite alignments in feldspars are related to magma compositions, especially F and P contents, and the crystallization of F-bearing minerals, especially of fluorapatite.

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来源期刊
Island Arc
Island Arc 地学-地球科学综合
CiteScore
2.90
自引率
26.70%
发文量
32
审稿时长
>12 weeks
期刊介绍: Island Arc is the official journal of the Geological Society of Japan. This journal focuses on the structure, dynamics and evolution of convergent plate boundaries, including trenches, volcanic arcs, subducting plates, and both accretionary and collisional orogens in modern and ancient settings. The Journal also opens to other key geological processes and features of broad interest such as oceanic basins, mid-ocean ridges, hot spots, continental cratons, and their surfaces and roots. Papers that discuss the interaction between solid earth, atmosphere, and bodies of water are also welcome. Articles of immediate importance to other researchers, either by virtue of their new data, results or ideas are given priority publication. Island Arc publishes peer-reviewed articles and reviews. Original scientific articles, of a maximum length of 15 printed pages, are published promptly with a standard publication time from submission of 3 months. All articles are peer reviewed by at least two research experts in the field of the submitted paper.
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