English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Dominica is geologically similar to the nearby islands of Guadeloupe, Montserrat, and St. Lucia in the Lesser Antilles. Unlike the latter three, a comprehensive study has yet to be conducted on the alteration minerals resulting from the hydrothermal and fumarolic environments on this island. Dominica has nine volcanoes and is primarily composed of andesite and dacite. Four of these volcanic centers are associated with geothermal activity where hot sulfur-bearing gases from magmatic sources mix with meteoric water to produce steam-heated acidic-sulfate waters. One of the geothermal areas, the Cold Soufriere has colder surface temperatures compared to others on the island. The hydrothermal waters of Dominica are classified as acid-sulfate and are immature with respect to bedrock interaction (Joseph et al., 2011; Onlyeali et al., 2017). Immaturity depends on the degree of interaction and mixing that has occurred between the water and the host lithology in the reservoir. Immature waters do not achieve equilibrium with the host rock composition and therefore the use of solute (Na, K, and Mg) geothermometry is not appropriate. Silica thermometry may be a more reasonable option for estimating reservoir temperatures in this case. Silica thermometry of the hydrothermal waters shows that the reservoir temperature of the Cold Soufriere is <80 °C, whereas Sulfur Springs and the Valley of Desolation have reservoir temperatures of 100-200 °C (Onlyeali et al., 2017). Rocks in these hydrothermal areas typically are observed with a rind of sublimates and incrustations composed of secondary alteration minerals. Samples of the altered rock were collected from three different hydrothermal site locations in Dominica, which vary in temperature, as well as moisture level. The aim of this research project is to address the following questions: What minerals are present in the rocks and associated alteration rinds at these sites? What were the processes causing this alteration? Finally, what differences exist between these three sites?

INVESTIGATION OF MINERAL ALTERATION IN ANDESITE AND DACITE FROM THREE DIFFERENT VOLCANO HYDROTHERMAL SYSTEMS ON DOMINICA, LESSER ANTILLES