Volcanic‐hosted sulfide‐barite deposit from the Kita‐Bayonnaise submarine caldera, Izu‐Ogasawara arc, northwestern pacific
Volcanic‐hosted sulfide‐barite deposit from the Kita‐Bayonnaise submarine caldera, Izu‐Ogasawara arc, northwestern pacific
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西北太平洋伊豆-小笠原弧北-巴约乃斯海底破火山口的火山硫化物重晶石矿床
DOI：
10.1080/10641199709379931
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
K. Marumo
中科院分区：
文献类型：
--
作者：
K. Iizasa;S. Terashima;M. Sasaki;K. Marumo
通过潜水研究(Shinkai 2000)，在太平洋西北部伊豆-小川岛岛岛脊的Kita-Bayonnaise海底破火山口东底发现了高Au含量(19.3ppm)的火山赋存硫化物和重晶石矿化。热液成矿的流纹岩凝灰岩部分被氧化锰包裹，并与热液锰结壳和热液蚀变凝灰岩-角砾岩附近的贻贝壳碎屑伴生。细小的流纹质凝灰岩以大块体(约2×1×1米)的碎片出现在距骨岩上，而结壳则以几米宽或更小的薄片出现在破火山口底板上。矿化流纹岩凝灰岩的矿石矿物组成主要为硫化物和重晶石。随机夹层的绢云母和蒙脱石是矿化流纹岩凝灰岩中唯一来自玻璃碎屑的热液粘土矿物。矿化凝灰岩明显富含锌、铁、铜、钡、金、银、砷等元素，具有较高的金矿化特征。
Volcanic‐hosted sulfide and barite mineralization with high Au content (19.3 ppm) was discovered by submersible study (Shinkai 2000) on the eastern floor of the Kita‐Bayonnaise submarine caldera on the Shichito‐Iwojima Ridge, Izu‐Ogasawara Arc, northwestern Pacific. The hydrothermally mineralized rhyolitic tuff is partly coated by Mn oxyhydrox‐ide, and associated with hydrothermal Mn crusts and debris of mussel shells in the vicinity of the hydrothermally altered tuff‐breccias. The minearlized rhyolitic tuff occurs as a fragment of a large block (about 2 ×1 ×1 m) on talus, while the crusts occur on the caldera floor as a few thin patches several meters across or smaller. Ore‐mineral composition of the mineralized rhyolitic tuff consists mainly of sulfides and barite. Randomly interstratified seriate and montmorillonite is the only hydrothermal clay mineral from glass shards in the mineralized rhyolitic tuff. The mineralized tuff is significantly enriched in Zn, Fe, Cu, Ba, Au, Ag, and As, and has high Au ...