Date of Graduation
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Restricted: Embargoed [Open Access After Expiration]
Bachelor of Science
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Number of Pages
An unusual deposit of Fe-rich hydrothermal nontronite was recovered by remotely operated vehicle (ROV) from Seamount 3 of the Wolf-Darwin lineament, Galapagos Marine Reserve. X-ray diffraction, ICP-MS/ICP-AES, and SEM-EDS analyses show that this deposit is chemically and mineralogically similar to other deep-sea hydrothermal nontronites, indicating a formation temperature of about 30o to 50o Celsius. These Fe-Si-oxides and Fe-rich Al-poor nontronite deposits contain about 38-51 weight % SiO2 and 40-50 weight % Fe2O3. Although hydrothermal nontronite has been sampled at a number of sites by coring and dredging, this is the first in situ documentation of its sinuous, tubular structure on the sea floor. Image-analysis of ROV imagery suggests that this unusual pattern might be controlled by fluid pathways in the underlying pillow lavas.
Lubetkin, Megan J.; Carey, Steven; and Robert, Genevieve, "Hydrothermal oxide and nontronite deposits at Seamount 3, Wolf-Darwin lineament, Galapagos Archipelago, Ecuador" (2016). Standard Theses. 27.