The characteristics of the seafloor massive sulfide deposits at the hakurei site in the izena hole, the middle okinawa trough

Ryoto Yoshizumi, Youko Miyoshi, Jun Ichiro Ishibashi

Research output: Chapter in Book/Report/Conference proceedingChapter

4 Citations (Scopus)

Abstract

The seafloor massive sulfide (SMS) deposits, which were found in the Izena Hole, the middle Okinawa Trough, show two modes of occurrence, namely, large sulfide mounds on the seafloor and massive sulfide bodies beneath sediments. A 610-cm long sequence of alternating beds of sediment and ore layers was drilled to investigate the lower ore body, at high rates of core recovery (average 64 %), at the northern part of the Hakurei Site in the Izena Hole, the middle Okinawa Trough. Observation on polished sections of the core samples under reflection microscope indicates that the ores (18–166 cmbsf (cm below seafloor)) above the sediment layer (166–221 cmbsf) are porous and contain acicular barite and globular sphalerite with small barite inclusions. These textures are considered to have formed as a result of rapid cooling. On the other hand, ores (221–510 cmbsf) below the sediment layer (166–221 cmbsf) had a massive layer of sphalerite and galena on top (black ore), a middle layer of pyrite and chalcopyrite-rich layer (yellow ore) and a bottom layer of sphalerite and large barite.

Original languageEnglish
Title of host publicationSubseafloor Biosphere Linked to Hydrothermal Systems
Subtitle of host publicationTAIGA Concept
PublisherSpringer Japan
Pages561-566
Number of pages6
ISBN (Electronic)9784431548652
ISBN (Print)9784431548645
DOIs
Publication statusPublished - Jan 1 2015

Fingerprint

massive sulfide
trough
seafloor
barite
sphalerite
sediment
ore body
galena
chalcopyrite
pyrite
texture
sulfide
ore
cooling

All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)

Cite this

Yoshizumi, R., Miyoshi, Y., & Ishibashi, J. I. (2015). The characteristics of the seafloor massive sulfide deposits at the hakurei site in the izena hole, the middle okinawa trough. In Subseafloor Biosphere Linked to Hydrothermal Systems: TAIGA Concept (pp. 561-566). Springer Japan. https://doi.org/10.1007/978-4-431-54865-2_43

The characteristics of the seafloor massive sulfide deposits at the hakurei site in the izena hole, the middle okinawa trough. / Yoshizumi, Ryoto; Miyoshi, Youko; Ishibashi, Jun Ichiro.

Subseafloor Biosphere Linked to Hydrothermal Systems: TAIGA Concept. Springer Japan, 2015. p. 561-566.

Research output: Chapter in Book/Report/Conference proceedingChapter

Yoshizumi, R, Miyoshi, Y & Ishibashi, JI 2015, The characteristics of the seafloor massive sulfide deposits at the hakurei site in the izena hole, the middle okinawa trough. in Subseafloor Biosphere Linked to Hydrothermal Systems: TAIGA Concept. Springer Japan, pp. 561-566. https://doi.org/10.1007/978-4-431-54865-2_43
Yoshizumi R, Miyoshi Y, Ishibashi JI. The characteristics of the seafloor massive sulfide deposits at the hakurei site in the izena hole, the middle okinawa trough. In Subseafloor Biosphere Linked to Hydrothermal Systems: TAIGA Concept. Springer Japan. 2015. p. 561-566 https://doi.org/10.1007/978-4-431-54865-2_43
Yoshizumi, Ryoto ; Miyoshi, Youko ; Ishibashi, Jun Ichiro. / The characteristics of the seafloor massive sulfide deposits at the hakurei site in the izena hole, the middle okinawa trough. Subseafloor Biosphere Linked to Hydrothermal Systems: TAIGA Concept. Springer Japan, 2015. pp. 561-566
@inbook{2c8ebd72112346449cd140c263251d36,
title = "The characteristics of the seafloor massive sulfide deposits at the hakurei site in the izena hole, the middle okinawa trough",
abstract = "The seafloor massive sulfide (SMS) deposits, which were found in the Izena Hole, the middle Okinawa Trough, show two modes of occurrence, namely, large sulfide mounds on the seafloor and massive sulfide bodies beneath sediments. A 610-cm long sequence of alternating beds of sediment and ore layers was drilled to investigate the lower ore body, at high rates of core recovery (average 64 {\%}), at the northern part of the Hakurei Site in the Izena Hole, the middle Okinawa Trough. Observation on polished sections of the core samples under reflection microscope indicates that the ores (18–166 cmbsf (cm below seafloor)) above the sediment layer (166–221 cmbsf) are porous and contain acicular barite and globular sphalerite with small barite inclusions. These textures are considered to have formed as a result of rapid cooling. On the other hand, ores (221–510 cmbsf) below the sediment layer (166–221 cmbsf) had a massive layer of sphalerite and galena on top (black ore), a middle layer of pyrite and chalcopyrite-rich layer (yellow ore) and a bottom layer of sphalerite and large barite.",
author = "Ryoto Yoshizumi and Youko Miyoshi and Ishibashi, {Jun Ichiro}",
year = "2015",
month = "1",
day = "1",
doi = "10.1007/978-4-431-54865-2_43",
language = "English",
isbn = "9784431548645",
pages = "561--566",
booktitle = "Subseafloor Biosphere Linked to Hydrothermal Systems",
publisher = "Springer Japan",
address = "Japan",

}

TY - CHAP

T1 - The characteristics of the seafloor massive sulfide deposits at the hakurei site in the izena hole, the middle okinawa trough

AU - Yoshizumi, Ryoto

AU - Miyoshi, Youko

AU - Ishibashi, Jun Ichiro

PY - 2015/1/1

Y1 - 2015/1/1

N2 - The seafloor massive sulfide (SMS) deposits, which were found in the Izena Hole, the middle Okinawa Trough, show two modes of occurrence, namely, large sulfide mounds on the seafloor and massive sulfide bodies beneath sediments. A 610-cm long sequence of alternating beds of sediment and ore layers was drilled to investigate the lower ore body, at high rates of core recovery (average 64 %), at the northern part of the Hakurei Site in the Izena Hole, the middle Okinawa Trough. Observation on polished sections of the core samples under reflection microscope indicates that the ores (18–166 cmbsf (cm below seafloor)) above the sediment layer (166–221 cmbsf) are porous and contain acicular barite and globular sphalerite with small barite inclusions. These textures are considered to have formed as a result of rapid cooling. On the other hand, ores (221–510 cmbsf) below the sediment layer (166–221 cmbsf) had a massive layer of sphalerite and galena on top (black ore), a middle layer of pyrite and chalcopyrite-rich layer (yellow ore) and a bottom layer of sphalerite and large barite.

AB - The seafloor massive sulfide (SMS) deposits, which were found in the Izena Hole, the middle Okinawa Trough, show two modes of occurrence, namely, large sulfide mounds on the seafloor and massive sulfide bodies beneath sediments. A 610-cm long sequence of alternating beds of sediment and ore layers was drilled to investigate the lower ore body, at high rates of core recovery (average 64 %), at the northern part of the Hakurei Site in the Izena Hole, the middle Okinawa Trough. Observation on polished sections of the core samples under reflection microscope indicates that the ores (18–166 cmbsf (cm below seafloor)) above the sediment layer (166–221 cmbsf) are porous and contain acicular barite and globular sphalerite with small barite inclusions. These textures are considered to have formed as a result of rapid cooling. On the other hand, ores (221–510 cmbsf) below the sediment layer (166–221 cmbsf) had a massive layer of sphalerite and galena on top (black ore), a middle layer of pyrite and chalcopyrite-rich layer (yellow ore) and a bottom layer of sphalerite and large barite.

UR - http://www.scopus.com/inward/record.url?scp=84944612592&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84944612592&partnerID=8YFLogxK

U2 - 10.1007/978-4-431-54865-2_43

DO - 10.1007/978-4-431-54865-2_43

M3 - Chapter

AN - SCOPUS:84944612592

SN - 9784431548645

SP - 561

EP - 566

BT - Subseafloor Biosphere Linked to Hydrothermal Systems

PB - Springer Japan

ER -