Hydrothermal activities in the Fonualei Spreading and Rift Center (FRSC) in the Lau basin, southwestern Pacific: Preliminary data

Title
Hydrothermal activities in the Fonualei Spreading and Rift Center (FRSC) in the Lau basin, southwestern Pacific: Preliminary data
Author(s)
김종욱; 이경용; 형기성; 문재운; 손승규
KIOST Author(s)
Kim, Jonguk(김종욱)Hyeong, Kiseong(형기성)Moon, Jai Woon(문재운)Son, Seung Kyu(손승규)
Publication Year
2006-10-26
Abstract
Hydrothermal activities were discovered along the axis of Fonualei spreading and rift center (FRSC) and off-axis active caldera in the northeastern Lau basin during the hydrothermal expedition performed by KORDI in 2005. Chemical tracers in water column, such as light transparency, Mn, methane, and ATP, indicate that at least three active hydrothermal vent sites exist along the FRSC. Barite-rich hydrothermal chimney fragments also sampled from one of these hydrothermal vent sites in the FRSC. Another hydrothermal venting was discovered near the neovolcanic cone of the off-axis caldera (MTJ-1) near the northern spreading axis of the FRSC at around 15o20’S. The volcanic rocks from the FRSC and MTJ-1 are basalt to basaltic andesite and dacite, respectively. These rocks are enriched in LILE and depleted in HFSE, which suggests incorporation of arc component during the magma genesis. Hydrothermal chimney fragments mainly consist of barite and sphalertie with minor amount of pyrite and chalcopyrite, which indicate that these chimneys are formed under low-temperature condition. These chimney fragments have high gold contents up to 18 ppm. Sediment cores sampled near the two hydrothermal vent sites in the FRSC contain several layers enriched in elements of hydrothermal origin, including Mn, Cu, Zn, Pb, As, Ga, Ba, and Tl. Our preliminary data on water column, sediment, and chimney fragments support the active hydrothermal venting in the study area.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/30842
Bibliographic Citation
2006 대한지질학회 추계학술대회, 2006
Publisher
대한지질학회
Type
Conference
Language
English
Publisher
대한지질학회
Related Researcher
Research Interests

Deep seabed exploration,Geochemistry,심해저자원탐사,지화학

Files in This Item:
There are no files associated with this item.

qrcode

Items in ScienceWatch@KIOST are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse