Corrigendum to "Seismic imaging of Santorini: Subsurface constraints on caldera collapse and present-day magma recharge" [Earth Planet. Sci. Lett. 514 (2019) 48-61]
Corrigendum to "Seismic imaging of Santorini: Subsurface constraints on caldera collapse and present-day magma recharge" [Earth Planet. Sci. Lett. 514 (2019) 48-61]
复制标题
“圣托里尼岛地震成像：火山口塌陷和当今岩浆补给的地下限制”的勘误[地球行星。
DOI：
10.1016/j.epsl.2019.04.007
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发表时间：
2019
影响因子：
5.3
通讯作者：
Hooft E
中科院分区：
文献类型：
--
作者：
Hooft E
在这种情况下，圣托里尼岛的地震和地质结果提供了观测证据，证明了在火山口逐步沉降过程中多阶段嵌套火山口形成的模型（Acocella，2006年）。在阶段A，内陷落柱将沿着外倾逆断层形成，顶板岩石破裂（图6 f）。在阶段B，一个新的外环塌陷将导致整个地形破火山口下沉，并在阶段4打开新的喷口（图6c）。因此，地质上独特的LBA喷发阶段的形成是火山口形成的每个阶段发生的地质过程的直接结果（图6）。很可能上述三种情况（图6d-f）都在圣托里尼岛高孔隙度内圆柱体的形成中发挥了作用。因此，在火山口内部坍塌时，逆断层作用造成的岩石破裂可能伴随着火山口在剧烈的岩浆-水相互作用时的破裂和扩孔，甚至会促进这种破裂和扩孔。此外，高孔隙度圆柱体的上部可能是由喷发火山产物（包括凝灰岩、火山碎屑岩和熔结凝灰岩）的沉积形成的。
In this scenario, the seismic and geological results from Santorini provide observational evidence for models of multistage, nested caldera formation during progressive caldera subsidence (Acocella, 2006). During stage A, the inner collapse column would be formed along outward-dipping reverse faults with breakup of the roof rock (Fig. 6f). During stage B, a new outer ring of collapse would cause subsidence of the entire topographic caldera and the opening of new vents during phase 4 (Fig. 6c). Accordingly, the geologically distinctive LBA eruptive phases form as a direct result of geological processes occurring during each stage of caldera formation (Fig. 6).It is quite possible that all three of the above scenarios (Fig. 6d-f) play a role in generating the inner cylinder of high porosities at Santorini. Thus, rock breakup by reverse faulting during inner caldera collapse may be accompanied by, or even promoted by, fracturing and reaming of the volcanic vent during violent magma-water interactions. In addition, the upper portions of the high-porosity cylinder are probably formed by the deposition of eruptive volcanic products including tuffs, pyroclasts, and ignimbrites.