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UNIVERSITY of PALERMO Department of Earth and Marine Sciences (Distem) Ph.D UNIVERSITY OF PALERMO Department of Earth and Marine Sciences (DiSTeM) Ph.D. in Earth and Marine Sciences NEOTECTONIC ACTIVITY AND EMISSION OF FLUIDS IN THE NORTHWEST SICILY CHANNEL Scientific Sector Geo/02 Ph.D. Candidate Spatola Daniele COORDINATOR of Ph.D. SUPERVISORS Prof Alessandro Aiuppa Prof Attilio Sulli Dr Aaron Micallef XXIX CICLO A.A. 2014-2016 _________________________________________________________________________ NEOTECTONIC ACTIVITY AND EMISSION OF FLUIDS IN THE NORTHWEST SICILY CHANNEL DR DANIELE SPATOLA NEOTECTONIC ACTIVITY AND EMISSION OF FLUIDS IN THE NORTHWEST SICILY CHANNEL Ph.D. thesis in Earth and Marine Sciences Department of Earth and Marine Sciences University of Palermo Italy PHD THESIS IN EARTH AND MARINE SCIENCES b NEOTECTONIC ACTIVITY AND EMISSION OF FLUIDS IN THE NORTHWEST SICILY CHANNEL DR DANIELE SPATOLA SUPERVISORS Prof Attilio Sulli, Department of Earth and Marine Sciences, University of Palermo, Italy Dr Aaron Micallef, Department of Geoscience, University of Malta, Msida, Malta REVIEWERS Dr Alessandra Savini, Department of Earth and Environmental Sciences, University of Milano-Bicocca Milano, Italy Dr Claudio Lo Iacono, National Oceanography Centre, Southampton, United Kingdom PHD THESIS IN EARTH AND MARINE SCIENCES c NEOTECTONIC ACTIVITY AND EMISSION OF FLUIDS IN THE NORTHWEST SICILY CHANNEL DR DANIELE SPATOLA LIST OF CONTENTS ACKNOWLEDGMENTS 1 ABSTRACT 2 RIASSUNTO 6 COLLABORATION AND PROPERTY DATA 10 TALK AND POSTER PRESENTATIONS OF THE PRELIMINARY RESULTS AT INTERNATIONAL CONFERENCES 13 1 CHAPTER 1- INTRODUCTION TO TOPIC 14 1.1 Specific motivation and aims of the project 14 1.2 Seafloor fluid and gas seepage 16 1.3 Methane seafloor seepage 19 1.4 Fluid escape structures 20 1.4.1 Pockmarks 22 1.4.2 Mud Volcanoes 29 1.5 Gas hydrates 32 1.6 Submarine landslide and sediment mass movements 35 2 CHAPTER 2 - REGIONAL SETTING OF THE STUDY AREA 39 2.1 Geographic and Geomorphological setting 39 2.2 Geological Setting 43 2.3 Stratigraphy 46 2.4 Volcanism 49 2.5 Seismicity 52 2.6 Oceanographic setting 54 PHD THESIS IN EARTH AND MARINE SCIENCES i NEOTECTONIC ACTIVITY AND EMISSION OF FLUIDS IN THE NORTHWEST SICILY CHANNEL DR DANIELE SPATOLA 3 CHAPTER 3 - DATA AND METHODS 57 3.1 Multibeam Data 57 1 Acquisition 60 2 Processing 63 3.2 Chirp Data 65 1 Acquisition 65 2 Processing 66 3.3 Multichannel Seismic profiles 68 4 CHAPTER 4 - THESIS OUTLINE 71 4.1 Geomorphology of the volcanic sector around the Graham Bank (Sicily Channel, central Mediterranean Sea) Abstract 72 1. Introduction 73 2. Geological Setting 75 3. Materials and Methods 78 4. Results 79 4.1 Geomorphological characterisation 79 4.1.1 Western sector 80 4.1.2 Central sector 81 4.1.3 Eastern sector 81 4.2 Seismic characteristics 89 5. Discussion and Conclusions 91 5.1 Tectonic control 91 5.2 Morphological interpretation of the seamounts 92 PHD THESIS IN EARTH AND MARINE SCIENCES ii NEOTECTONIC ACTIVITY AND EMISSION OF FLUIDS IN THE NORTHWEST SICILY CHANNEL DR DANIELE SPATOLA 4.2 Fluid Escape Structures in the Graham Bank (Sicily Channel, central Mediterranean) triggered by volcanism and tectonics Abstract 96 1. Introduction 97 2. Geological Setting 101 3. Data and methods 104 4. Results 105 4.1 Geomorphological characterisation 105 4.2 Seismostratigraphic analysis 113 4.2.1 High-resolution data 113 4.2.2 High-penetration data 117 4.3 Isopach Maps 120 5. Discussion 121 5.1 Seafloor morphology controlled by tectonic, volcanic and sedimentary processes 121 5.2 Fluid escape structures 123 5.3 Controlling factors of fluid flow 124 6. Conclusions 127 4.3 Submarine Gravity Driven Deposits in the volcanic Graham Bank (central Mediterranean Sea): an interaction among tectonic and volcanic triggering mechanisms Abstract 128 1 Introduction 129 2 Regional Setting 132 2.1 Geological setting 132 2.2 Morphology and Oceanography 133 3 Materials and Methods 134 4 Results 135 PHD THESIS IN EARTH AND MARINE SCIENCES iii NEOTECTONIC ACTIVITY AND EMISSION OF FLUIDS IN THE NORTHWEST SICILY CHANNEL DR DANIELE SPATOLA 4.1 Geomorphological outline 135 4.2 Gravity driven deposits 138 4.3 Seismostratigraphic analysis 142 4.3.1 Seismostratigraphic features of the Gravity driven deposits 144 5 Discussion 146 5.1 Types of gravity driven deposits 147 5.1.1 Soft-sediment deformation structures, SSDs 147 5.1.2 Rock Falls 148 5.1.3 Debris avalanches 148 5.2 Driving forces and trigger mechanisms 149 5.2.1 Tectonic trigger mechanisms 149 5.2.2 Volcanic trigger mechanisms 150 5.2.3 Sedimentary/oceanographic trigger mechanisms 151 6 Conclusions 151 5 CHAPTER 5 – SYNTHESIS AND CONCLUSIONS 153 REFERENCES 158 ATTACHMENT 181 PHD THESIS IN EARTH AND MARINE SCIENCES iv NEOTECTONIC ACTIVITY AND EMISSION OF FLUIDS IN THE NORTHWEST SICILY CHANNEL DR DANIELE SPATOLA ACKNOWLEDGEMENTS First and foremost, I would like to thank Prof Attilio Sulli for giving me the opportunity to work on this diverse and wonderful topic. I sincerely thank Prof A. Sulli and Dr A. Micallef, my supervisors, for their very useful and indispensable suggestions, which have improved all my studies and research for my Ph.D. Their very important advice and ideas helped me greatly in getting to grips with the complex scientific issue and the large amount of data available. Thanks to them, I had several opportunities to work on the scientific marine geology field participating in different oceanographic cruises. This helped me to develop my expertise with acoustic and seismic methods. It has been a great experience to know and to work with people of different countries and in different working groups facing the same challenges in their projects. It has been an honor to be their Ph.D. student. I thank Dr Alessandra Savini and Dr Claudio Lo Iacono for agreeing to be the reviewers of my Ph.D. thesis. Many thanks also goes to the whole Marine Geology group of the University of Palermo, which provided a great working environment. I am grateful to Dr L. Basilone and to Prof A. Aiuppa (coordinator of Ph.D.) of the University of Palermo. Special thanks are due to Dr P. Galea, head of the Department of Geosciences as well as the University of Malta for their skilled help during the last year of my Ph.D. studies. I am grateful to Dr G. Basilone (IAMC of Capo Granitola); P. Guida, Master of the R/V Minerva UNO and all his crew for their help during the data acquisition and the on-board operations. The oceanographic cruise that was fundamental for this Ph.D. project was benefited from funding and ship-time through the RITMARE project (CNR Mazara del Vallo, Capo Granitola section). Thank you also for the great times we had on research cruises together. My family, David and Daniel supported me throughout my studies and always encouraged me to pursue this project. I want to thank them for that. PHD THESIS IN EARTH AND MARINE SCIENCES 1 NEOTECTONIC ACTIVITY AND EMISSION OF FLUIDS IN THE NORTHWEST SICILY CHANNEL DR DANIELE SPATOLA PHD THESIS IN EARTH AND MARINE SCIENCES 2 NEOTECTONIC ACTIVITY AND EMISSION OF FLUIDS IN THE NORTHWEST SICILY CHANNEL DR DANIELE SPATOLA ABSTRACT The southern Sicilian coast represents an important contribution to Italian tourism, the Sicily Channel is an important communication path because at the top of its seafloor there are many pipelines, and submarine communication cables which are laid to carry signals, and which are very important to the minor islands. In this work, we are presenting results of the detailed geomorphological and seismostratigraphic analysis based on new very high-resolution dataset (multibeam and CHIRP) acquired during the ACUSCAL 2015 Cruise. We also used low resolution bathymetric and seismic data provided from online database (ViDEPI, GEBCO, EMODnet). This study allows us to reconstruct the tectonic volcanic mass movement and bottom current processes and to identify and map several relative geological elements (e.g. fluid escape structures, gravity driven deposits, volcanic morphologies) which were used to describe the geological setting of the study area. The latter is a small area (approx 100 km2) located in a shallow sector of the north-western Sicily Channel, at a distance of 45 km from the Sicilian coastline, where seven seamounts (M1-M7) have been identified and studied between 10 and 350 m in depth. In the study area, the interaction of the sedimentary multilayer (e.g. Holocene sedimentary body, Messinian Evaporites) and the volcanic context (i.e. Graham Bank) with the tectonic activity (shallow and deep) creates a complex and highly geological framework hosting seafloor seepage. The main focus is the description of the fluid escape structures suggesting a possible model for the origin of the fluid and the mechanisms by which it is transferred to the seafloor. Another important aim is the reconstruction of the relationship between the deep tectonic structures and the fluid escape structures in the north-west Sicily Channel. PHD THESIS IN EARTH AND MARINE SCIENCES 3 NEOTECTONIC ACTIVITY AND EMISSION OF FLUIDS IN THE NORTHWEST SICILY CHANNEL DR DANIELE SPATOLA Seafloor seepage is a widespread phenomenon in the global ocean forming important seafloor morphologies. It affects the global carbon cycle and provides the basis for abundant chemosynthetic organisms living in and on the seafloor. In this Ph.D. project, detailed investigation about the geological setting of such sites and the controlling factors for spatial and temporal distribution of the fluid escape structures were indispensable to understand the “fluid flow system functions” This work is a prime example of these interactions and their influence on seafloor seepage in the Western part of the Sicily Channel. Many pockmarks, mounds and some active seafloor seepages (i.e. hydro acoustic anomalies) have been identified and investigated using both stratigraphic information provided by AGIP/ENI Wells in conjunction with various geophysical data primarily multibeam and Chirp and secondarily multichannel seismic profiles and low resolution bathymetric data.
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