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首页> 外文期刊>Resource Geology >Chemistry and Sulfur Isotopes in a Chert-dominant Sequence around the Stratiform Manganese Deposit of the Noda-Tamagawa Mine, Northern Kitakami Terrane, Northeast Japan: Implication for Paleoceanographic Environmental Setting
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Chemistry and Sulfur Isotopes in a Chert-dominant Sequence around the Stratiform Manganese Deposit of the Noda-Tamagawa Mine, Northern Kitakami Terrane, Northeast Japan: Implication for Paleoceanographic Environmental Setting

机译：日本东北北上野地田野田玉川矿的层状锰矿床周围以Cher特为主的化学和硫同位素：对古海洋环境的影响

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Chemistry and sulfur isotopes are analyzed for a series of rocks in the chert-dominant sequence around the stratiform manganese ore deposit of the Noda-Tamagawa mine in the northern Kitakami Terrane, northeast Japan. The sequence is litholog-ically classified into six units in ascending order: lower bedded chert, lower black shale, massive chert, manganese ore, upper black shale, and upper bedded chert. The rocks around the manganese ore deposit exhibit anomalous enrichment in Ni (max. 337 ppm), Zn (102) and U (30) in the upper part of lower bedded chert, Mo (122), Tl (79) and Pb (33) in the lower black shale, MnO. Cu (786) and Co (62) in the manganese ore, and As (247) and Sb (17) in the upper black shale. The aluminum-normalized profiles reveal zonal enrichment of redox-sensitive elements around the manganese bed: Zn-Ni-Fe-Mo-U(-Co), Tl-Pb(-Mo), Mn-Fe-Cu-V-Cr-Co(-Zn) and As-Sb in ascending order. The uppermost part of the lower bedded chert and black shale exhibit negative Ce/Ce* values, whereas the massive chert, manganese ore and lower part of the upper bedded chert display positive values. The isotopic delta~(34)S values are 0 +- 6 per thousand in the lower part of the lower bedded chert, -19 to -42 per thousand in the upper part of the lower bedded chert, -36 to -42 per thousand in the lower black shale, -28 to -35 per thousand in the massive chert, manganese ore and upper black shale, and -23 +- 5 per thousand in the upper bedded chert. Thus, there is a marked negative shift in delta~(34)S values in the lower bedded chert, and an upward-increasing trend in delta~(34)S through the manganese ore horizon. The present data provide evidence for a change in the paleoceanographic environmental resulting from inflow of oxic deepwater into the stagnant anoxic ocean floor below the manganese ore horizon. This event is likely to have triggered the precipitation of manganese oxyhydroxides. The redistribution of redox-sensitive elements through the formation of metalliferous black shale and manganese carbonate ore may have occurred in association with bacteria] decomposition of organic matter during early diagenesis of initial manganese oxyhydroxides.
机译：在日本东北的北上北田野野田-玉川矿的层状锰矿床周围，以the特优势序列分析了一系列岩石的化学和硫同位素。从岩石学角度上看，该层序按升序分为六个单元：下部层状石，下部黑页岩，块状石，锰矿，上部黑页岩和上部层状石。锰矿床周围的岩石在下部层状硅质upper石的上部表现出异常富集的Ni（最大337 ppm），Zn（102）和U（30），Mo（122），Tl（79）和Pb（33） ）在下部黑色页岩中（MnO）。锰矿中的铜（786）和钴（62），黑页岩上部的砷（247）和锑（17）。铝归一化轮廓揭示了锰床周围氧化还原敏感元素的区域富集：Zn-Ni-Fe-Mo-U（-Co），Tl-Pb（-Mo），Mn-Fe-Cu-V-Cr- Co（-Zn）和As-Sb升序排列。下部层状石和黑色页岩的最上部显示出负Ce / Ce *值，而块状cher石，锰矿石和上部层状石的下部显示正值。同位素δ〜（34）S值在下层硅质t石下部为千分之0 +-6，在下层硅质石上部为千分之-19至-42，千分之-36至-42在下部的黑色页岩中，块状，石，锰矿和上部的黑色页岩中的千分之-28至-35，在上部的层状石中千分之-23 +-5。因此，下部层状石中的δ〜（34）S值存在明显的负向变化，而整个锰矿层的δ〜（34）S则呈上升趋势。目前的数据提供了证据，证明了有氧深水流入锰矿层以下停滞的缺氧海底所引起的古海洋环境的变化。此事件很可能触发了羟基氧化锰的沉淀。通过含金属的黑色页岩和碳酸锰矿石的形成，氧化还原敏感元素的重新分布可能与细菌[]在初始氢氧化正锰的早期成岩过程中有机物的分解有关。

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