Hydrothermal native copper in ocean island alkali basalt from the Mineoka belt, Boso Peninsula, Japan
Native copper grains are found in aphyric amygdaloidal basalt of early Miocene age (ca. 20 Ma) in the southern Mineoka belt of Boso Peninsula, central Japan. The native copper was precipitated in the amygdules or veins along with calcite and analcime. The temperature of precipitation and salinity of...
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ftmichigantuniv:oai:digitalcommons.mtu.edu:museum-p-1002 2023-05-15T18:50:54+02:00 Hydrothermal native copper in ocean island alkali basalt from the Mineoka belt, Boso Peninsula, Japan Ikehata, Kei Choda, Koshuke Tsunogae, Toshiaki Bornhorst, Theodore J. 2016-05-01T07:00:00Z https://digitalcommons.mtu.edu/museum-p/3 https://doi.org/10.2113/econgeo.111.3.783 unknown Digital Commons @ Michigan Tech https://digitalcommons.mtu.edu/museum-p/3 https://doi.org/10.2113/econgeo.111.3.783 A. E. Seaman Mineral Museum Publications Geology text 2016 ftmichigantuniv https://doi.org/10.2113/econgeo.111.3.783 2022-01-23T10:33:38Z Native copper grains are found in aphyric amygdaloidal basalt of early Miocene age (ca. 20 Ma) in the southern Mineoka belt of Boso Peninsula, central Japan. The native copper was precipitated in the amygdules or veins along with calcite and analcime. The temperature of precipitation and salinity of the fluids related to the native copper are approximately 133° to 183°C and 0.9 to 3.9 wt % as estimated by fluid inclusions trapped in the calcite containing grains of the native copper. The native copper is interpreted as related to low-temperature, reducing, alkaline hydrothermal fluids. A sulfur-poor environment is inferred by the lack of sulfur-bearing minerals. The host rock of the Mineoka native copper is alkali basalt of oceanic island affinity. Native copper is well known to occur in mid-ocean ridge, island arc, oceanic island tholeiitic basalts, and continental tholeiitic basalt, but this is the first detailed description of an occurrence in ocean island alkali basalt. Text Ocean Island Ridge Island Michigan Technological University: Digital Commons @ Michigan Tech Ridge Island ENVELOPE(-67.082,-67.082,-67.690,-67.690) Economic Geology 111 3 783 794 |
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Open Polar |
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Michigan Technological University: Digital Commons @ Michigan Tech |
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ftmichigantuniv |
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topic |
Geology |
spellingShingle |
Geology Ikehata, Kei Choda, Koshuke Tsunogae, Toshiaki Bornhorst, Theodore J. Hydrothermal native copper in ocean island alkali basalt from the Mineoka belt, Boso Peninsula, Japan |
topic_facet |
Geology |
description |
Native copper grains are found in aphyric amygdaloidal basalt of early Miocene age (ca. 20 Ma) in the southern Mineoka belt of Boso Peninsula, central Japan. The native copper was precipitated in the amygdules or veins along with calcite and analcime. The temperature of precipitation and salinity of the fluids related to the native copper are approximately 133° to 183°C and 0.9 to 3.9 wt % as estimated by fluid inclusions trapped in the calcite containing grains of the native copper. The native copper is interpreted as related to low-temperature, reducing, alkaline hydrothermal fluids. A sulfur-poor environment is inferred by the lack of sulfur-bearing minerals. The host rock of the Mineoka native copper is alkali basalt of oceanic island affinity. Native copper is well known to occur in mid-ocean ridge, island arc, oceanic island tholeiitic basalts, and continental tholeiitic basalt, but this is the first detailed description of an occurrence in ocean island alkali basalt. |
format |
Text |
author |
Ikehata, Kei Choda, Koshuke Tsunogae, Toshiaki Bornhorst, Theodore J. |
author_facet |
Ikehata, Kei Choda, Koshuke Tsunogae, Toshiaki Bornhorst, Theodore J. |
author_sort |
Ikehata, Kei |
title |
Hydrothermal native copper in ocean island alkali basalt from the Mineoka belt, Boso Peninsula, Japan |
title_short |
Hydrothermal native copper in ocean island alkali basalt from the Mineoka belt, Boso Peninsula, Japan |
title_full |
Hydrothermal native copper in ocean island alkali basalt from the Mineoka belt, Boso Peninsula, Japan |
title_fullStr |
Hydrothermal native copper in ocean island alkali basalt from the Mineoka belt, Boso Peninsula, Japan |
title_full_unstemmed |
Hydrothermal native copper in ocean island alkali basalt from the Mineoka belt, Boso Peninsula, Japan |
title_sort |
hydrothermal native copper in ocean island alkali basalt from the mineoka belt, boso peninsula, japan |
publisher |
Digital Commons @ Michigan Tech |
publishDate |
2016 |
url |
https://digitalcommons.mtu.edu/museum-p/3 https://doi.org/10.2113/econgeo.111.3.783 |
long_lat |
ENVELOPE(-67.082,-67.082,-67.690,-67.690) |
geographic |
Ridge Island |
geographic_facet |
Ridge Island |
genre |
Ocean Island Ridge Island |
genre_facet |
Ocean Island Ridge Island |
op_source |
A. E. Seaman Mineral Museum Publications |
op_relation |
https://digitalcommons.mtu.edu/museum-p/3 https://doi.org/10.2113/econgeo.111.3.783 |
op_doi |
https://doi.org/10.2113/econgeo.111.3.783 |
container_title |
Economic Geology |
container_volume |
111 |
container_issue |
3 |
container_start_page |
783 |
op_container_end_page |
794 |
_version_ |
1766244653274759168 |