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Shallow-Water Geothermal Activity Offshore Panarea, Aeolian Island Arc, Italy.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Shallow-Water Geothermal Activity Offshore Panarea, Aeolian Island Arc, Italy./
作者:	Pascarelli, Samantha Eve.
面頁冊數:	1 online resource (143 pages)
附註:	Source: Masters Abstracts International, Volume: 83-02.
Contained By:	Masters Abstracts International83-02.
標題:	Geology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28316404click for full text (PQDT)
ISBN:	9798516976162

Shallow-Water Geothermal Activity Offshore Panarea, Aeolian Island Arc, Italy.
Pascarelli, Samantha Eve.

Shallow-Water Geothermal Activity Offshore Panarea, Aeolian Island Arc, Italy. - 1 online resource (143 pages)

Source: Masters Abstracts International, Volume: 83-02.

Thesis (M.S.)--Colorado School of Mines, 2021.

Includes bibliographical references

Panarea island represents a partially emerged arc volcano forming part of the Aeolian volcanic chain in the southern Tyrrhenian Sea. The island rises from the western sector of a submarine platform representing the eroded summit of a large submarine stratovolcano. Seafloor observations on the eastern portion of the submarine platform have been conducted using a remotely operated vehicle. The seafloor survey resulted in the discovery of a new field of hydrothermal venting between the Secca dei Panarelli and Basiluzzo islet that is typified by quiescent gas venting and the discharge of thermal waters at water depths ranging from 60 to 100 m. The geothermal activity is associated with a wide range of seafloor morphological features, many of which are transient in nature and will not likely be preserved in the geological record. This includes widespread anhydrite-gypsum deposits that have been drilling to a maximum penetration of 5 m below seafloor using a lander-type drilling device. The massive to brecciated hydrothermal deposits contain > 80% anhydrite and gypsum in addition to alteration minerals formed during subseafloor replacement and infiltration of the volcaniclastic host. Advanced-argillic alteration of the volcaniclastic material under acidic conditions resulted in the formation of kaolinite, with variable amounts of alunite, boehmite, and barite being present, whereas argillic alteration at near-neutral conditions caused smectite and rhodochrosite formation. Minor amounts of sulfide minerals, including pyrite, marcasite, sphalerite, and galena. The deposits show an enrichment of Ag, As, Cd, Hg, Pb, and Zn, attesting to the metal-carrying capacity of the thermal liquids. The isotopic composition of the sulfate minerals suggests that the anhydrite-gypsum deposits were formed by a mixture between thermal waters and seawater at temperatures of 132-170 °C. A model for fluid evolution of the Panarea hydrothermal field suggests mixing of an upwelling thermal liquid with shallow circulating seawater. Heating of seawater during mixing triggered the precipitation of anhydrite, which subsequently partly converted to gypsum. The thermal liquids likely contained volatiles derived from a magmatic source. The formation of massive sulfate deposits in shallow water on a partially emergent arc volcano make Panarea a distinct new type of seafloor hydrothermal system.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798516976162Subjects--Topical Terms:

516570
Geology.
Subjects--Index Terms:

AeolianIndex Terms--Genre/Form:

542853
Electronic books.

Shallow-Water Geothermal Activity Offshore Panarea, Aeolian Island Arc, Italy.
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245 1 0 $a Shallow-Water Geothermal Activity Offshore Panarea, Aeolian Island Arc, Italy.
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502 $a Thesis (M.S.)--Colorado School of Mines, 2021.
504 $a Includes bibliographical references
520 $a Panarea island represents a partially emerged arc volcano forming part of the Aeolian volcanic chain in the southern Tyrrhenian Sea. The island rises from the western sector of a submarine platform representing the eroded summit of a large submarine stratovolcano. Seafloor observations on the eastern portion of the submarine platform have been conducted using a remotely operated vehicle. The seafloor survey resulted in the discovery of a new field of hydrothermal venting between the Secca dei Panarelli and Basiluzzo islet that is typified by quiescent gas venting and the discharge of thermal waters at water depths ranging from 60 to 100 m. The geothermal activity is associated with a wide range of seafloor morphological features, many of which are transient in nature and will not likely be preserved in the geological record. This includes widespread anhydrite-gypsum deposits that have been drilling to a maximum penetration of 5 m below seafloor using a lander-type drilling device. The massive to brecciated hydrothermal deposits contain > 80% anhydrite and gypsum in addition to alteration minerals formed during subseafloor replacement and infiltration of the volcaniclastic host. Advanced-argillic alteration of the volcaniclastic material under acidic conditions resulted in the formation of kaolinite, with variable amounts of alunite, boehmite, and barite being present, whereas argillic alteration at near-neutral conditions caused smectite and rhodochrosite formation. Minor amounts of sulfide minerals, including pyrite, marcasite, sphalerite, and galena. The deposits show an enrichment of Ag, As, Cd, Hg, Pb, and Zn, attesting to the metal-carrying capacity of the thermal liquids. The isotopic composition of the sulfate minerals suggests that the anhydrite-gypsum deposits were formed by a mixture between thermal waters and seawater at temperatures of 132-170 °C. A model for fluid evolution of the Panarea hydrothermal field suggests mixing of an upwelling thermal liquid with shallow circulating seawater. Heating of seawater during mixing triggered the precipitation of anhydrite, which subsequently partly converted to gypsum. The thermal liquids likely contained volatiles derived from a magmatic source. The formation of massive sulfate deposits in shallow water on a partially emergent arc volcano make Panarea a distinct new type of seafloor hydrothermal system.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
650 4 $a Geology. $3 516570
650 4 $a Mineralogy. $3 516743
650 4 $a Mining. $3 3544442
650 4 $a Islands. $3 563444
650 4 $a Gases. $3 559387
650 4 $a Science. $3 516376
650 4 $a Volcanology. $3 2165551
650 4 $a Volcanoes. $3 535445
650 4 $a Explosions. $3 897877
650 4 $a Geochemistry. $3 539092
650 4 $a Seawater. $3 1532690
650 4 $a Marine geology. $3 3173821
650 4 $a Geophysics. $3 535228
650 4 $a Sediments. $3 3566210
650 4 $a Surveillance. $3 3559358
650 4 $a Mineralization. $3 3557941
650 4 $a Drilling. $3 3563985
650 4 $a Scanning electron microscopy. $3 551366
653 $a Aeolian
653 $a Geothermal
653 $a Panarea
653 $a Shallow-submarine
653 $a Sulfides
653 $a Volcano
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690 $a 0411
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710 2 $a ProQuest Information and Learning Co. $3 783688
710 2 $a Colorado School of Mines. $b Geology and Geological Engineering. $3 2094087
773 0 $t Masters Abstracts International $g 83-02.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28316404 $z click for full text (PQDT)