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Tectonically controlled carbonate-seated maar-diatreme volcanoes: the case of the Volsci Volcanic Field, central Italy
Journal of Geodynamics ( IF 2.3 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.jog.2020.101763
G.L. Cardello , L. Consorti , D.M. Palladino , E. Carminati , M. Carlini , C. Doglioni

Abstract Quaternary carbonate-seated maar-diatremes in the Volsci Range are one of the most intriguing products of the west-directed subduction of the Adriatic slab that drove the development of the Apennine mountain belt in Central Italy. The Volsci Volcanic Field is characterized by phreatomagmatic surge deposits, rich in accidental carbonate lithics, and subordinate Strombolian scoria fall deposits and lava flows, locally sourced from some tens of monogenetic eruptive centers (at least fifty tuff rings and scoria cones). We investigate the subsurface maar-diatreme processes in terms of relationships between faulting and explosive magma-water interaction, as well as the distribution pattern of the eruptive centers. With this aim, we present the following new data: i) description of the fold-and-thrust belt structure and associated eruptive centers, ii) componentry of volcanic rock-types, iii) determination of grain-size, degrees of whiteness and roundness of carbonate lithic inclusions, iv) micropaleontological analysis of carbonate lithics. We show that the clustering of eruptive centers is controlled by tectonic features. A first order control is tentatively related to crustal laceration and deep magma injection along a ENE-trending Quaternary lateral tear in the slab and to Mesozoic rift-related normal faults. A second-order control is provided by orogenic structures (mainly thrust and extensional faults). In particular, magma-water explosive interaction occurred at multiple levels (

中文翻译:

受构造控制的碳酸盐岩火山:以意大利中部沃尔西火山场为例

摘要 Volsci 山脉中第四纪碳酸盐岩层脉岩是亚得里亚海板块向西俯冲的最有趣产物之一,推动了意大利中部亚平宁山脉的发展。Volsci 火山场的特点是水岩浆涌动沉积物,富含偶然的碳酸盐岩岩,以及次要的 Strombolian 火山渣沉积物和熔岩流,局部来自几十个单成喷发中心(至少 50 个凝灰岩环和火山渣锥)。我们根据断层和爆炸性岩浆-水相互作用之间的关系以及喷发中心的分布模式研究了地下 maar-diatreme 过程。为此,我们提供以下新数据:i) 褶皱冲断带结构和相关喷发中心的描述,ii) 火山岩类型的成分,iii) 碳酸盐岩质包裹体的粒度、白度和圆度的测定,iv) 碳酸盐的微观古生物分析石器。我们表明喷发中心的集群受构造特征控制。一级控制暂定与地壳撕裂和深部岩浆注入沿板坯中 ENE 走向的第四纪横向撕裂以及与中生代裂谷相关的正断层有关。造山构造(主要是逆冲断层和伸展断层)提供了二级控制。特别是岩浆-水爆炸相互作用发生在多个层次(碳酸盐岩包裹体的白度和圆度,iv) 碳酸盐岩的微观古生物学分析。我们表明喷发中心的集群受构造特征控制。一级控制暂定与地壳撕裂和深部岩浆注入沿板坯中 ENE 走向的第四纪横向撕裂以及与中生代裂谷相关的正断层有关。造山构造(主要是逆冲断层和伸展断层)提供了二级控制。特别是岩浆-水爆炸相互作用发生在多个层次(碳酸盐岩包裹体的白度和圆度,iv) 碳酸盐岩的微观古生物学分析。我们表明喷发中心的集群受构造特征控制。一级控制暂定与地壳撕裂和深部岩浆注入沿板坯中 ENE 走向的第四纪横向撕裂以及与中生代裂谷相关的正断层有关。造山构造(主要是逆冲断层和伸展断层)提供了二级控制。特别是岩浆-水爆炸相互作用发生在多个层次(一级控制暂定与地壳撕裂和深部岩浆注入沿板坯中 ENE 走向的第四纪横向撕裂以及与中生代裂谷相关的正断层有关。造山构造(主要是逆冲断层和伸展断层)提供了二级控制。特别是岩浆-水爆炸相互作用发生在多个层次(一级控制暂定与地壳撕裂和深部岩浆注入沿板坯中 ENE 走向的第四纪横向撕裂以及与中生代裂谷相关的正断层有关。造山构造(主要是逆冲断层和伸展断层)提供了二级控制。特别是岩浆-水爆炸相互作用发生在多个层次(
更新日期:2020-09-01
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