气候变化领域集成服务门户(CCPortal): Assessing mantle versus crustal sources for non-volcanic degassing along fault zones in the actively extending southern Apennines mountain belt (Italy)

CCPortal

DOI	10.1130/B31869
	Assessing mantle versus crustal sources for non-volcanic degassing along fault zones in the actively extending southern Apennines mountain belt (Italy)
	Ascione A.; Ciotoli G.; Bigi S.; Buscher J.; Mazzoli S.; Ruggiero L.; Sciarra A.; Tartarello M.C.; Valente E.
发表日期	2018
ISSN	167606
起始页码	1697
结束页码	1722
卷号	130 期号:2021-09-10
英文摘要	The actively extending axial zone of the southern Apennine mountain belt of Italy is characterized by a substantial flow of nonvolcanic gas to the surface. In this study, we have analyzed the correlation between the active tectonic framework of the Matese Ridge area and the high gas emissions found to the southwest, which includes large amounts of CO2 (up to 99 vol%), CH4 (up to 0.55 vol%), and He (up to 52 ppmv). We measured CO2 and CH4 fluxes of up to 34000 g d-1 and 2000 g d-1, respectively, from zones of focused degassing (gas vents and associated strong diffuse emission). This anomalously high flux of CO2 (advective plus diffusive) indicates that the study area has one of the largest nonvolcanic natural emissions of CO2 ever measured on Earth. The isotope composition of C in CO2 and CH4 shows there is a dominant crustal contribution of emissions (as opposed to a source from the mantle), indicating that thermometamorphism of the buried Apulian Platform carbonates is probably the main cause of CO2 production. This process has likely been enhanced by Quaternary magmatism, which provides an additional local source of heat triggering decarbonation of Apulian Platform limestones and dolostones at depth. The advective flux is concentrated at gas vents located along active fault segments located at the western tip of a major crustal structure, the South Matese fault zone. We believe that the very high gas emission in the Matese Ridge area is the result of both the presence of a dense network of active fault strands, which provides efficient pathways for fluid flow toward the surface, and the dramatically reduced thickness of the clay-rich mélange zone acting elsewhere in the southern Apennines as a top seal overlying the buried Apulian Platform carbonates. © 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/185091
作者单位	Department of Earth, Environmental and Resources Science (DiSTAR), University of Naples 'Federico II,', Naples, 80126, Italy; National Research Council of Italy, Institute of Environmental Geology and Geoengineering (IGAG), Monterotondo, Rome, 00015, Italy; Istituto Nazionale di Geofisica e Vulcanologia (INGV), Rome, 00143, Italy; Department of Earth Sciences, University of Rome Sapienza, Rome, 00185, Italy; Andean Geothermal Center of Excellence (CEGA), Universidad de Chile, Santiago, 8370450, Chile; Department of Geology, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Santiago, 8370450, Chile
推荐引用方式 GB/T 7714	Ascione A.,Ciotoli G.,Bigi S.,et al. Assessing mantle versus crustal sources for non-volcanic degassing along fault zones in the actively extending southern Apennines mountain belt (Italy)[J],2018,130(2021-09-10).
APA	Ascione A..,Ciotoli G..,Bigi S..,Buscher J..,Mazzoli S..,...&Valente E..(2018).Assessing mantle versus crustal sources for non-volcanic degassing along fault zones in the actively extending southern Apennines mountain belt (Italy).Bulletin of the Geological Society of America,130(2021-09-10).
MLA	Ascione A.,et al."Assessing mantle versus crustal sources for non-volcanic degassing along fault zones in the actively extending southern Apennines mountain belt (Italy)".Bulletin of the Geological Society of America 130.2021-09-10(2018).