Asbestos in natural and anthropic ophiolitic environments: a case study of geohazards related to the Northern Apennine ophiolites (Eastern Liguria, Italy)

IF 1.2 4区 地球科学 Q2 GEOLOGY
L. Gaggero, L. Crispini, E. Isola, P. Marescotti
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引用次数: 15

Abstract

Asbestos-related environmental issues include: i) the presence of natural outcrops of asbestos-bearing rocks, ii) the cycle of asbestos within natural matrix- es, and iii) the quantitative assessment of asbestos fibres within large volumes of rock. The characterisation of the origin of asbestos as an exogenous agent, or during anthropogenic activity and the subsequent dispersal of fibres in neighbouring areas, allows the definition of a “fibre-cycle”, which is overall parallel to the hydric cycle. Pilot studies using microstructural and mineralogical investigations to assess the distribution and approximate volumes of asbestos minerals and their potential contribution of airborne fibres were undertaken at six quarry sites within the very-low-grade metamorphic ophiolites of the Northern Apen- nines in eastern Liguria, Italy. These studies also incorporated the assessment of the abundance of fibres within heaps of sedimentary debris within the same quarries; this assessment focused on heaps that were formed during natural erosion in addition to those formed during mineral extraction. This study also tested a protocol that aimed to improve the Italian DM 16/5/1994 Release Index by addressing the issue of multi-scale analyses that are tai- lored for studies from outcrop scales to the microscale by integrating multiple techniques (optical microscopy, scanning electron microscopy, XR diffractome- try, µ-Raman, geomechanical analysis, and modal petrographic analyses).
自然和人为蛇绿岩环境中的石棉:与亚平宁北部蛇绿岩有关的地质灾害案例研究(意大利东利古里亚)
与石棉有关的环境问题包括:1)含石棉岩石的自然露头;2)天然基质内石棉的循环;3)大量岩石内石棉纤维的定量评估。将石棉的来源定性为外源性物质,或在人为活动期间以及随后纤维在邻近地区的扩散,允许定义“纤维循环”,其总体上与水循环平行。在意大利利古里亚东部亚平宁山脉北部极低品位变质蛇绿岩中的六个采石场进行了初步研究,利用微观结构和矿物学调查来评估石棉矿物的分布和大致数量及其对空气纤维的潜在贡献。这些研究还包括对同一采石场内沉积碎屑堆中纤维丰度的评估;这次评估的重点是在自然侵蚀过程中形成的堆,以及在矿物开采过程中形成的堆。本研究还测试了一种方案,旨在通过集成多种技术(光学显微镜、扫描电子显微镜、XR衍射仪、微拉曼、地质力学分析和模态岩石学分析),解决从露头尺度到微观尺度的多尺度分析问题,从而提高意大利DM 16/5/1994释放指数。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Ofioliti
Ofioliti 地学-地质学
CiteScore
2.40
自引率
7.70%
发文量
1
期刊介绍: Since 1976, Ofioliti provides an international forum for original contributions and reviews in the field of the geodynamics, petrology, geochemistry, biostratigraphy, stratigraphy, tectonics and paleogeography applied to ophiolitic terrains and modern oceanic lithosphere, including their sedimentary cover. Studies of topics such as geodynamics of the mantle, the evolution of orogens including ophiolites and paleoceanography are also welcome
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