Transcript 103-17-VentCommStuff-2004(Lessons18&38)

HYDROTHERMAL SPRINGS
&
"VENT" COMMUNITIES
OF
MID-OCEAN RIDGES
GEOL 1033
Lecture ppt file 103-17
(Lesson 18)
DISTRIBUTION OF MARINE
HYDROTHERMAL VENTS
Canadian waters off BC cont. margin
• 1st discovered along the East Pacific rise
during a dive of the ALVIN in 1978
Discovered
ca. 1978
"SMOKERS"
• Black and white "smokers"
• Up to 450 deg. C waters
meet near-freezing seawater
HYDOTHERMAL "VENTS"
• Chimney-like precipitates
HYDOTHERMAL "VENTS"
• Seafloor hot springs!
VENT COMMUNITIES
• Unique organisms discovered (1978)
• Giant new species (clams, worms)
• Bacteria are the producer organisms at
the base of the food web
• Later found as fossils associated with
metal ore deposits on land that
originated in the sea
Giant Mussels & Clams
Chemosynthesis Instead of Photosynthesis
• Bacterial synthesis of organic
matter and energy storage
without sunlight
• These bacteria live
symbiotically in the tissues of
giant tube worms and giant
clams
• Fix CO2 to form organic
compounds
• Energy is obtained by
oxidizing H2S escaping from
the hydrothermal vents
END OF FILE
READING ASSIGNMENTS - Revised 26 Oct., 2003
Test #2
Test #1
•
•
7th Edition, 2003, Sverdrup & others, pages correspond to lesson topics in the Study Guide:
– Lesson 1
page 2
– Lesson 2
p. 29-38, 45-51
– Lesson 8
p. 54-59
(Q7 assigned)
– Lesson 3
p. 38-42
(E3 assigned)
– Lesson 4
p. 2-21, 24-26
(Q3 assigned)
– Lesson 5
p. 40-45; 3(bottom+fig)-4(fig); 259(bottom)-260(top) (Q4 assigned)
– Lesson 6
p. 42-45, 87-89, 364(gases)
– Lesson 7
p. 99-101(top),108-109,143-144(sound),120(bottom)-124 (Q6 assigned)
– Lesson 9 p. 62-63, 101(bathymetry)-112(fig)
– Lesson 10 p. “
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– Lesson 11 p. “
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(Q9 assigned)
– Lesson 12 p. “
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, 107(fig+bottom)-110(top), 464-465
– Lesson 13 p. “
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– Lesson 14 p. 112(sediments)-127
(Q11 assigned)
– Lesson 15 p. 393-413
– Lesson 37 p. 393-413, 374-379
(Q27 assigned)
– Lesson 16 p. 53-61, 65
(E9 assigned)
– Lesson 17 p. 64(fig), 66, 73-75, 127(Min Dep), 87, 90-96, 468-469
– Lesson 18 p. 71-79, 81(hot spots)-83
– Lesson 19 p. 64-71
– Lesson 20 “ “ “
– Lesson 21 p. 83-86, 95-96
(Q13 assigned)
6th edition, (2000), or 5th edition, (1997) may be used. Ask for handout for pages to be studied.