<br>天然存在的钙角闪石石棉的成核,Environmental Research

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天然存在的钙角闪石石棉的成核
Environmental Research ( IF 7.7 ) Pub Date : 2023-03-23 , DOI: 10.1016/j.envres.2022.114940
Maxime Misseri ₁

Affiliation

本文提出了天然石棉矿物生长的四个阶段的初始模型。在细观裂缝周围的受损区域中观察到了发育早期阶段的结构，特别是在细观裂缝前面和沿细观裂缝的微裂缝、微腔和微裂纹中。这项研究仅限于钙角闪石交叉纤维，它是由改变的钙角闪石发展而来。使用 PLM 进行观察，部分使用 TEM 进行观察。这些样品是来自法国的角闪岩、辉绿岩和夕卡岩。所有这些岩石的共同点是它们都暴露在热液循环中，这使得它们具有丙烷特征。最早的现象是交代脉的发育。在这些矿脉中，阳起石在角闪石后形成假晶。新的角闪石保留了角闪石的原始形态，特别是解理的外观。在第二阶段，热液循环促进亚晶（DSG）的发育，其边界通常与解理平行。由于热液的溶解，一些亚晶粒变得更薄且越来越个体化。第三阶段是压裂阶段。 DSG 的不规则末端和角闪石碎片可以形成石棉状矿物核的基质。 DSG 的进一步溶解也可以导致底物的产生。最后一个阶段是成核和生长。核具有圆锥形形状和可变宽度，从几微米到大约十微米。石棉矿物 (BPAM) 的基底部分沿 c 轴延伸 DSG。 BPAM 具有可变的宽度，并且在其发展过程中可以在横向微裂纹水平上分裂。 BPAM 在不分裂时具有与使用气液晶体机制合成的晶须纳米晶体相当的形态。 BPMA 碎片的形状与 DSG 的形状接近，因为两者都具有可变的宽度，并且都具有由微裂纹控制的长度。

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Nucleation of naturally occurring calcic amphibole asbestos

This article proposes an initial model of natural asbestiform minerals growing in four stages. Structures dating from the early stages of the development were observed in the damaged zone surrounding meso-fractures, more particularly in microfractures, microcavities and microcracks that lie in front of and along mesofractures. This study is limited to calcium amphiboles cross-fibers, which develop from altered calcium amphiboles. The observations were made using PLM, with some using TEM. The samples are amphibolites, dolerites and skarns from France. All these rocks have in common that they have been exposed to hydrothermal circulation which gives them a propylite character. The earliest phenomenon was the development of metasomatic veins. In these veins, actinolite form pseudomorphs after hornblendes. The new amphiboles preserve the original morphology of hornblende, in particular the appearance of the cleavages. In the second stage, hydrothermal Fluid circulation promotes the development of subgrains (DSG) with boundaries generally parallel to the cleavage. Some sub-grains become thinner and more and more individualized due to dissolution by the hydrothermal fluid. The third stage is fracturing. The irregular ends of DSGs and amphibole debris can form the substrate of asbestiform mineral nuclei. Further dissolution of DSGs can also lead to the creation of substrates. The last stage is the nucleation and growth. The nuclei have a conical shape and variable widths, from a few microns to about ten microns. The basal parts of the asbestos minerals (BPAMs) extend the DSGs along the c axis. BPAMs have variable widths and can divide during their development at the level of transverse microcracks. BPAMs when not dividing have a morphology comparable to that of whisker nanocrystals synthesized using the vapor-liquid-crystal mechanism. The shape of the fragments from BPMAs is close to that of DSGs as both have variable widths and both have lengths controlled by microcracks.

更新日期：2023-03-23

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