Chemical compositions of interstitial waters from Iheya North Knoll and Noho Site during CK16-01 cruise

Abstract

From February 29 to March 17, 2016, deep-sea drilling of hydrothermal systems was operated at Iheya North Knoll and Noho Site in Okinawa Trough. Recovered core samples were cut off at 1 m long on the Lab. Roof Deck, and gas sensing and sub-sampling for gas analysis were conducted. The sectioned cores were then scanned by X-ray computed tomography. The core samples for interstitial water analysis were selected at 10-25 cm long. The sample was squeezed according to the IODP protocol to extract interstitial water samples. The samples were used for measurements of pH, alkalinity, nutrients, and hydrogen sulfide on board, and major elements on land.