气候变化领域集成服务门户(CCPortal): Seismically enhanced hydrothermal plume advection through the process zone of the Compione extensional Fault, Northern Apennines, Italy

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DOI	10.1130/B32029.1
	Seismically enhanced hydrothermal plume advection through the process zone of the Compione extensional Fault, Northern Apennines, Italy
	Lucca A.; Storti F.; Molli G.; Muchez P.; Schito A.; Artoni A.; Balsamo F.; Corrado S.; Salvioli Mariani E.
发表日期	2018
ISSN	167606
起始页码	547
结束页码	571
卷号	131 期号:2021-03-04
英文摘要	Reconstructing the paleofluid evolution in mature fault zones, which typically have complex structural architectures, is a challenging task because reactivation of pre-existing deformation structures and dissolution-reprecipitation processes are very abundant. Understanding why specific structural elements are preferentially mineralized and what are the factors leading to rapid fluid migration and accumulation, bears geological and economic implications, especially in seismically active fault zones. We studied the Compione Fault on the Tyrrhenian Sea side of the Northern Apennines orogenic wedge, Italy, which is a segment of the 30-km-long Northern Lunigiana high-angle extensional fault system still active today. The Compione Fault propagated from the metamorphic basement and accumulated about 1.5 km of displacement. We used structural, petrographic, isotopic, microthermometric, compositional, and organic matter analyses to constrain fluid and host rock properties during fault zone evolution. This approach allowed us to quantify the thermal anomaly in the fault zone and to infer the processes responsible for such a disequilibrium. Specifically, we show that in the fault process zone ahead of the upper fault tip, which is twice as wide as the damage zone, seismic pumping caused suprahydrostatic fluid pressures and that local dilation promoted the nucleation of a highly permeable mesh of conjugate extensional shear fractures hosting calc-silicate mineralization. The thermal difference between hydrothermal minerals in the conjugate fracture mesh and the host rock is 60-90 °C. The mineralizing fluids were deeply sourced from metamorphic reactions. Propagation of the upper fault tip caused process zone folding and incorporation into the fault damage zones. As the upper fault tip breached through shallower structural levels, it favored mixing between deep and meteoric fluids. © 2018 Geological Society of America.
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185048
作者单位	Department of Chemistry, Life Sciences and Environmental Sustainability, Natural and Experimental Tectonics research group, University of Parma, Parma, I-43124, Italy; Department of Earth Sciences, University of Pisa, via S. Maria, 53, Pisa, I-56126, Italy; Department of Earth and Environmental Sciences, Katholieke Universiteit Leuven, Celestijnenlaan 200E, Heverlee, B-3001, Belgium; Department of Sciences, Geology Section, Roma Tre University, L.go S. Leonardo Murialdo 1, Roma, I-00146, Italy; Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parma, I-43124, Italy
推荐引用方式 GB/T 7714	Lucca A.,Storti F.,Molli G.,et al. Seismically enhanced hydrothermal plume advection through the process zone of the Compione extensional Fault, Northern Apennines, Italy[J],2018,131(2021-03-04).
APA	Lucca A..,Storti F..,Molli G..,Muchez P..,Schito A..,...&Salvioli Mariani E..(2018).Seismically enhanced hydrothermal plume advection through the process zone of the Compione extensional Fault, Northern Apennines, Italy.Bulletin of the Geological Society of America,131(2021-03-04).
MLA	Lucca A.,et al."Seismically enhanced hydrothermal plume advection through the process zone of the Compione extensional Fault, Northern Apennines, Italy".Bulletin of the Geological Society of America 131.2021-03-04(2018).