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首页> 外文期刊>Toxicology and Applied Pharmacology >Characterization of asbestiform glaucophane-winchite in the Franciscan Complex blueschist, northern Diablo Range, California
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Characterization of asbestiform glaucophane-winchite in the Franciscan Complex blueschist, northern Diablo Range, California

机译：北部暗黑破坏神系列中央复合体的石棉色素铝串的特征，加州

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摘要

This paper presents a geologic and mineralogical investigation of asbestiform amphibole from blueschist in the Diablo Range, northern California. The analysis of fibers in air samples shows that the dominant blueschist amphibole composition ranges from glaucophane to subordinate winchite. In outcrop, blueschist amphibole exhibits a velvety luster, and its occurrence ranges from crosscutting veins to highly deformed foliated and lineated tectonites. TEM and SEM photographs reveal a highly fibrous habit typically associated with asbestiform amphiboles. Dimensional analysis reveals a mean fiber width of 0.27?μm, and lengths and aspect ratios are shorter than reported for commercially exploitable asbestos, with a mean length of 2.8?μm and mean aspect ratio of 11.5. The data are consistent with other research showing that the width population of fibers, and not length or aspect ratio, is the key indicator of the asbestiform habit. The blueschist data are compared to non-asbestiform hornblende amphibole in granitic rocks. The fiber concentration of the hornblende (458 MFG) is low compared to the blueschist amphibole (107,880 MFG) and chrysotile in serpentinite (196,066 MFG), indicating that under similar conditions, the exposure potential from cleaved particles could be several orders of magnitude lower than from asbestiform particles. The asbestiform habit of glaucophane is present at two other locations in the Franciscan Complex, suggesting that asbestiform blueschist amphibole may be characteristic within blueschist terranes, and rock formations containing asbestiform amphibole may be more common and widespread than previously assumed.
机译：本文介绍了北加州北加州暗黑破坏神系列的Blueschist的性质和矿物学调查。空气样品中的纤维分析表明，显性的布鲁斯分子锥形组合物从青光素到从属滑轮的范围。在露头中，Blueschist Amphibole表现出天鹅绒般的光泽，其发生从横切静脉到高度变形的叶片和链状化石。 TEM和SEM照片揭示了通常与石棉均方相关的高度纤维状习惯。尺寸分析显示平均纤维宽度为0.27≤μm，长度和纵横比对于商业可利用的石棉的概述短，平均长度为2.8Ωμm，平均纵横比为11.5。该数据与其他研究一致，表明纤维的宽度群体，而不是长度或纵横比，是石棉习惯的关键指标。将BlueSchist数据与花岗岩中的非缺乏圆形角勃氏锥进行比较。与六萜镁（196,066MFG）的Blueschist amphibol（107,888mFg）和菊花胺相比，Hortblende（458mFG）的纤维浓度低，表明在类似的条件下，来自切割颗粒的曝光电位可能是几个数量级来自asbestiform颗粒。青光素的石棉习惯在Franciscan复合物中存在于其他两个位置，表明Blueschist地区的Asbestiflif Blueschist amphiboles在布鲁斯地区的特征可以是特征，并且含有原木锥形锥体的岩层可能比以前假设的更常见和普及。

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