Chemical weathering fluxes from Paramushir volcanic island (Kuril Island arc, Russia)

Elena Kalacheva,Ekaterina Voloshina,Tatiana Kotenko,O Chudaev,R Millot,Y Kharaka,R Harmon,O Shouakar-Stash

doi:10.1051/e3sconf/20199808007

Elena Kalacheva, Ekaterina Voloshina + Show 6 more

Open Access

https://doi.org/10.1051/e3sconf/20199808007

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Abstract

The rates of the chemical erosion for Paramushir Island, north Kuril Arc, were studied. The rates of the chemical erosion for Paramushir Island, north Kuril Arc, were studied. They were based on the results of the flow rate measurements and chemical analyses of 35 river’s water, sampled in July 2017. The silicate weathering fluxes caused by the subsurface thermal and two different types of surface waters (acid SO4 and near-neutral Na (Ca)-HCO3) of Paramushir have been estimated as 1095±200, 203 ±100 and 64 ± 20 t/km2/year, respectively. The total chemical weathering flux for Paramushir Island is estimated as 120± 40 t/km2/year.

Highlights

Water-rock interaction, including hydrolysis reactions cause rock destruction and removal of elements from the crystalline lattice of minerals
Removal of dissolved matter (DCPS) by surface flows affects the stability of volcanic edifices and the chemical composition of the surrounding seas and oceans
Based upon the results of hydrochemical sampling and hydrological measurements conducted in July 2017, the silicate weathering fluxes caused by the subsurface thermal and two different types of surface waters (acid SO4 and near-neutral Na (Ca)-HCO3) of Paramushir have been estimated as 1095±200, 203 ±100 and 64 ± 20 t/km2/year, respectively

Summary

Introduction

Water-rock interaction, including hydrolysis reactions cause rock destruction and removal of elements from the crystalline lattice of minerals. In the areas of recent and modern island-arc volcanism, chemical erosion of volcanic rocks represents one of the most intense type of silicate weathering. Removal of dissolved matter (cations +SiO2) (DCPS) by surface flows affects the stability of volcanic edifices and the chemical composition of the surrounding seas and oceans. The chemical weathering rates from volcanic islands in tropical areas have been first estimated in [4] as 10-20 times more efficient than from other environments. For the first time the chemical erosion rate from a volcanic island at a latitude of ~ 48.5°N (Shiashkotan Island, Kuril Island arc) has been estimated by Kalacheva et al [2] as ~ 2-5 times less efficient than that of tropical islands. We present the first details data of the surface and subsurface chemical fluxes by rivers of Paramushir, northern Kuril Islands

Geological and hydrological settings

Methods

Results and discussion

Concluding remarks