A currently forming petroleum associated with hydrothermal mineralization in a submarine caldera, Kagoshima Bay, Japan
A currently forming petroleum associated with hydrothermal mineralization in a submarine caldera, Kagoshima Bay, Japan
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目前正在形成的石油与日本鹿儿岛湾海底破火山口的热液矿化有关
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
J. Hashimoto
中科院分区：
文献类型：
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作者：
T. Yamanaka;C. Mizota;T. Murae;J. Hashimoto
在日本九州南部鹿儿岛湾北方的若见子火山口海底（深度= 200 m）的热液蚀变近期沉积物中发现了类似石油的产物。高浓度的多环芳烃（PAHs）的热解起源和生物标志物的签名代表不同程度的成熟度表明，相关的沥青是一个典型的热液石油。这是首次报道与岛弧海底火山作用有关的大量热液石油。石油是由火山口沉积的近代沉积物中的有机物热解产生的。热液石油和块状硫化物矿床的结论是，目前正在形成的破火山口内的海底下的热液活动，目前形成的黑矿型硫化物矿床也有报告。考虑到热液石油和黑子型矿床在若见子火山口同时形成，我们提出一个假设，即在中新世中期，同样的现象广泛发生在日本东北部与大规模的海洋火山活动，导致石油和硫化物矿床（黑子）在同一地质层位的形成。
Petroleum-like products have been found in hydrothermally altered recent sediments of the submarine Wakamiko Caldera (depth = 200 m) in the northern Kagoshima Bay, southern Kyushu, Japan. High concentrations of polynuclear aromatic hydrocarbons (PAHs) of pyrolytic origin and biomarkers signatures representing diverse degrees of maturation have indicated that the associated bitumen is a typical hydrothermal petroleum. This is the first report on a significant content of hydrothermal petroleum related with a submarine volcanism of island-arc. The petroleum was generated by pyrolysis of organic matter in recent sediments deposited in the caldera. The hydrothermal petroleum and massive sulfide deposits are concluded to be currently forming within the caldera by hydrothermal activities below the seafloor where presently forming Kuroko-type sulfide deposits were also reported. Considering simultaneous formation of the hydrothermal petroleum and the Kuroko-type deposits in the Wakamiko Caldera, we propose a hypothesis that, during the middle Miocene, the same phenomena happened extensively in northeast Japan in association with the large-scale marine volcanisms, resulting in the formation of both petroleum and sulfide ore deposits (Kuroko) in the same geological horizons.