کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8906714 | 1634658 | 2018 | 17 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Crustal-scale fluid circulation and co-seismic shallow comb-veining along the longest normal fault of the central Apennines, Italy
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم زمین و سیاره ای (عمومی)
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چکیده انگلیسی
The extensional Val Roveto Fault, which is the longest exhumed potentially-seismogenic structure of central Apennines, Italy, is examined to constrain earthquake-related fluid circulation and fluid sources within shallow carbonate-hosted faults. The study focuses on fault-related comb and slip-parallel veins that are calcite-filled and cut through the principal surface of the Val Roveto Fault. We observe multiple crack-and-seal events characterized by several veining episodes, probably related to different slip increments along the fault plane. We show that vein calcite precipitated in Late Pleistocene time below the present-day outcrop level at a maximum depth of â¼350 m and temperatures between 32 and 64â°C from meteoric-derived fluids modified by reactions with crustal rocks and with a mantle contribution (up to â¼39%). The observed warm temperatures are not compatible with a shallow (â¤â¼350 m) precipitation depth, which, in this region, is dominated by circulation of cold meteoric water and/or shallow groundwater. Based on structural-geochemical data, we propose that deep-seated crust-mantle-derived warm fluids were squeezed upward during earthquakes and were hence responsible for calcite precipitation at shallow depths in co-seismic comb and slip-parallel fractures. As comb- and slip-parallel veins are rather common, particularly along seismogenic extensional faults, we suggest that further studies are necessary to test whether these veins are often of co-seismic origin. If so, they may become a unique and irreplaceable tool to unravel the seismic history of hazardous active faults.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Earth and Planetary Science Letters - Volume 498, 15 September 2018, Pages 152-168
Journal: Earth and Planetary Science Letters - Volume 498, 15 September 2018, Pages 152-168
نویسندگان
Luca Smeraglia, Stefano M. Bernasconi, Fabrizio Berra, Andrea Billi, Chiara Boschi, Antonio Caracausi, Eugenio Carminati, Francesca Castorina, Carlo Doglioni, Francesco Italiano, Andrea Luca Rizzo, I. Tonguç Uysal, Jian-xin Zhao,