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Besides onshore mud volcanoes there are buried volcanoes and offshore mud volcanoes. There are over 140 offshore mud volcanoes within the Caspian Sea. Eight Islands within Baku archipelago were generate by mud volcanoes eruptions (Khara-Zira, Zanbil, Garasu, Gil, Sangi-Mughan, Chigmil etc). Buried mud volcanoes have been encountered by exploration wells. Ancient activities of mud volcanoes were identified among various age stratigraphic units. It is suggested that mud volcanoes activity within the Republic of Azerbaijan about 25,000 years ago. Usually, mud volcanoes eruption begins with subsurface rumble followed by a strong burst. Gases coming out to the surface from deeply buried formations get ignited and blaze up. Flame tongues may at times reach up to 1000m high (Garasu mud volcano).
Observations indicate that 50 mud volcanoes have burst about 200 times since 1810 in Azerbaijan. Lock-Batan mud volcano erupted 19 times during that period. Mud volcanoes erupt mud, solid rock fragments, gas and water. Mud volcanoes outbursts contain over 100 minerals and up to 30 chemical microelements (such as barite, mercury, manganese, copper, barium, strontium, lithium etc). The origin of mud volcanoes is associated with buried hydrocarbon deposits. Prolific oil and gas -condensate fields have been discovered in areas characterized by mud volcanoes development (Lock-Batan, Neft Dashlary, Garadagh, Mishovdagh etc). Mud volcanoes outbursts are used as the medical row material.
|Category: NATURE | Added by: shamsi_84 (10.05.2011)|