Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Bologna, via Creti, 12, 40128, Bologna, Italy.
Nat Commun. 2018 Nov 2;9(1):4608. doi: 10.1038/s41467-018-07087-z.
Earth degassing of CO-rich fluids has been proven to contribute significantly to the global carbon budget. The presence of ubiquitous outgassing reveals some degree of permeability of the crust that often coincides with seismically active zones. In this study, we took advantage of the most recent global geological datasets to better understand earth degassing and how it correlates with tectonic regimes. Here we use an ad hoc point pattern analysis to show that there is a spatial correlation between CO discharges and the presence of active fault systems, in particular with those characterized by a normal slip type. Seismic data demonstrate the existence of a positive spatial correlation between gas discharges and extensional tectonic regimes and confirms that such processes would play a key role in creating pathways for the rising gases at micro- and macro-scales, increasing the rock permeability and connecting the deep crust to the earth surface.
地球释放富含 CO 的流体已被证明对全球碳预算有重大贡献。广泛存在的排气现象表明地壳具有一定程度的渗透性，而这种渗透性通常与地震活跃带相一致。在这项研究中，我们利用最新的全球地质数据集来更好地了解地球释放及其与构造体系的关系。在这里，我们使用一种特定的点模式分析来表明，CO 排放与活动断层系统的存在之间存在空间相关性，特别是与具有正常滑动类型的断层系统之间存在相关性。地震数据表明，气体排放与伸展构造体系之间存在正的空间相关性，并证实这些过程将在微观和宏观尺度上为上升气体创造通道，增加岩石渗透性并将深部地壳与地球表面连接起来方面发挥关键作用。
