1. HYDROTHERMAL SPRINGS & "VENT" COMMUNITIES OF MID-OCEAN RIDGES
GEOL 1033
Lecture ppt file
(Lesson 18)

2. 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

3. "SMOKERS" Black and white "smokers"
Up to 450 deg. C waters meet near-freezing seawater

4. HYDOTHERMAL "VENTS"
Chimney-like precipitates

5. HYDOTHERMAL "VENTS"
Seafloor hot springs!

6. 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

7. Giant Mussels & Clams

8. 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

9. END OF FILE

12. READING ASSIGNMENTS - Revised 26 Oct., 2003
7th Edition, 2003, Sverdrup & others, pages correspond to lesson topics in the Study Guide:
Lesson 1 page 2
Lesson 2 p , 45-51
Lesson 8 p (Q7 assigned)
Lesson 3 p (E3 assigned)
Lesson 4 p. 2-21, (Q3 assigned)
Lesson 5 p ; 3(bottom+fig)-4(fig); 259(bottom)-260(top) (Q4 assigned)
Lesson 6 p , 87-89, 364(gases)
Lesson 7 p (top), , (sound),120(bottom)-124 (Q6 assigned)
Lesson 9 p , 101(bathymetry)-112(fig)
Lesson 10 p. “ “ “ “
Lesson 11 p. “ “ “ “ (Q9 assigned)
Lesson 12 p. “ “ “ “ , 107(fig+bottom)-110(top),
Lesson 13 p. “ “ “ “
Lesson 14 p. 112(sediments) (Q11 assigned)
Lesson 15 p
Lesson 37 p , (Q27 assigned)
Lesson 16 p , (E9 assigned)
Lesson 17 p. 64(fig), 66, 73-75, 127(Min Dep), 87, 90-96,
Lesson 18 p , 81(hot spots)-83
Lesson 19 p
Lesson 20 “ “ “
Lesson 21 p , (Q13 assigned)
6th edition, (2000), or 5th edition, (1997) may be used. Ask for handout for pages to be studied.
Test #1
Test #2