On crustal composition of the Sardinia-Corsica continental block inferred from receiver functions

IF 3.2 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Solid Earth Pub Date : 2024-07-24 DOI:10.5194/egusphere-2024-1515
Fabio Cammarano, Henrique Berger Roisenberg, Alessio Conclave, Islam Fadel, Mark van der Meijde
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Abstract

Abstract. Subduction-related geodynamic processes significantly influence plate tectonics and Earth’s evolution, yet their impact on the continental crust remains poorly understood. We investigated the Sardinia-Corsica continental block, situated in the Mediterranean Sea, which has experienced intense subduction-driven geodynamic events. By analyzing P-wave receiver functions from our LiSard seismic network and publicly available stations, we aimed to understand crustal structure and composition. We inferred the Moho depth and examined the P-wave to S-wave velocity ratio (VP /VS ). We interpret our findings considering petrological data, heat flux measurements, and other geophysical information. We found that the Variscan granitoid batholith has the greatest Moho depths in both Sardinia and Corsica. VP /VS ratios (ranging from 1.65 to 1.70) are consistent with average crustal values of SiO2 between 65 % and 70 %. However, in central Corsica, two stations have exceptionally high VP /VS values (>1.80), suggesting the possible presence of serpentinite throughout the crust. In Alpine Corsica, a station exhibited similar high VP /VS values but a shallower Moho depth of 21 km. The western part of Sardinia, where Cenozoic volcanism occurred, also showed a shallower Moho depth (20–25 km) and high VP /VS values. The highest VP /VS value (1.91) is recorded in an area where surface-wave dispersion curves from ambient noise identified the lowest average S-wave velocity and where the highest heat flux has been reported, indicating elevated crustal temperatures and possible presence of melt within the crust. Overall, our results indicate that the recent geodynamic processes have left the granitoid batholith almost intact, with minimal alteration to its composition.
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从接收器函数推断撒丁岛-科西嘉大陆块的地壳构成
摘要。与俯冲有关的地球动力过程对板块构造和地球演化有重大影响,但人们对它们对大陆地壳的影响仍然知之甚少。我们对位于地中海的撒丁岛-科西嘉大陆块进行了研究,该大陆块经历了强烈的俯冲驱动地球动力事件。通过分析 LiSard 地震网络和公开台站的 P 波接收函数,我们旨在了解地壳结构和组成。我们推断了莫霍深度,并研究了 P 波与 S 波的速度比(VP /VS )。我们结合岩石学数据、热通量测量和其他地球物理信息对研究结果进行了解释。我们发现,在撒丁岛和科西嘉岛,瓦利斯坎花岗岩岩床的莫霍深度最大。VP/VS比率(从1.65到1.70不等)与地壳中二氧化硅的平均值(65%到70%)相一致。然而,在科西嘉岛中部,有两个站点的 VP /VS 值特别高(1.80),表明整个地壳可能存在蛇绿岩。在科西嘉高山地区,一个站点显示出类似的高 VP /VS 值,但莫霍深较浅,为 21 千米。撒丁岛西部发生过新生代火山活动,该地区的莫霍深也较浅(20-25 千米),VP /VS 值较高。最高的 VP /VS 值(1.91)记录在一个区域,该区域的环境噪声面波频散曲线确定了最低的平均 S 波速度,而且据报道该区域的热通量最高,表明地壳温度升高,地壳内可能存在熔体。总之,我们的研究结果表明,近期的地球动力过程使花岗岩熔岩几乎完好无损,其成分变化极小。
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来源期刊
Solid Earth
Solid Earth GEOCHEMISTRY & GEOPHYSICS-
CiteScore
6.90
自引率
8.80%
发文量
78
审稿时长
4.5 months
期刊介绍: Solid Earth (SE) is a not-for-profit journal that publishes multidisciplinary research on the composition, structure, dynamics of the Earth from the surface to the deep interior at all spatial and temporal scales. The journal invites contributions encompassing observational, experimental, and theoretical investigations in the form of short communications, research articles, method articles, review articles, and discussion and commentaries on all aspects of the solid Earth (for details see manuscript types). Being interdisciplinary in scope, SE covers the following disciplines: geochemistry, mineralogy, petrology, volcanology; geodesy and gravity; geodynamics: numerical and analogue modeling of geoprocesses; geoelectrics and electromagnetics; geomagnetism; geomorphology, morphotectonics, and paleoseismology; rock physics; seismics and seismology; critical zone science (Earth''s permeable near-surface layer); stratigraphy, sedimentology, and palaeontology; rock deformation, structural geology, and tectonics.
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