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首页> 外文期刊>Marine Geology >Fluctuation of biogenic and abiogenic sedimentation on the Shatsky Rise in the western North Pacific during the late Quaternary
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Fluctuation of biogenic and abiogenic sedimentation on the Shatsky Rise in the western North Pacific during the late Quaternary

机译：第四纪晚期北太平洋西部沙茨基上升区生物和非生物沉积的波动

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Sedimentation of biogenic and abiogenic components was studied in cores NGC108 (36 deg 36.85 min N, 158 deg 20.90 min E; water depth 3390 m) and S2612 (32 deg 19.84 min N, 157 deg 51.00 min E; water depth of 2612 m) from the Shatsky Rise to understand fluctuations in primary productivity and abiogenic sedimentation in the mid-latitude of the western North Pacific during the late Quaternary. The mean C_(Organic)/N atomic ratio of 6.0-7.8 in both cores indicates that organic matter is mainly marine in origin. Organic carbon is positively correlated with biogenic opal in core NGC108 in contrast to a weak correlation in core S2612. Although the maxima of paleoproductivity estimates in both cores generally occur during glacial times, the paleoproductivity estimates, biogenic opal/carbonate ratios and the C_(Organic)/C_(Carbonate) ratios have always been higher in core NGC108 than in core S2612 during the last 180 kyr, suggesting that the surface water at site NGC108 could have been influenced more by Subarctic water mass than at site S2612. However, the opal/carbonate ratio in core S2612 remains fairly constant relative to that in core NGC108, which might mean that the transition zone between Subarctic and Central water was narrower in latitude in at the oxygen isotope stage (OIS) 2/3 boundary, OIS 4 and OIS 6. Sedimentation of 13 inorganic elements has been measured in both cores. These elements are classified into four groups based on correlation between each element in content: (1) terrigenous components (Al, Ti, Fe), (2) biogenic calcareous material (Ca, Sr), (3) biogenic-scavenged elements (Mg, Zn, Cr, Be), and (4) the other elements (Mn, Ba, Cu, Ni). The terrigenous mass accumulation rates were elevated in OIS 2, 3 and 4 and late OIS 6 in core NGC108 while they were higher in early OIS 1, OIS 2, 4 and 6 in core S2612. MnO_2 and Ba might be redistributed during the sub-surface reduced condition. Especially precipitation of particle-reactive Be, which could be accelerated by both enhanced terrigenous input and biogenic vertical transport, has fluctuated largely in response to climatic change because of its short residence time (on the order of the oceanic mixing time).
机译：在NGC108岩心（北纬36度36.85分钟，东经158度20.90分钟;水深3390 m）和S2612（北纬32度19.84分钟，北纬157度51.00分钟;水深2612 m）中研究了生物和非生物成分的沉积从Shatsky Rise那里了解第四纪晚期第四纪中期北太平洋中纬度的初级生产力和非生物沉积的波动。两个核的平均C_（有机）/ N原子比为6.0-7.8，表明有机物质主要来自海洋。与核心S2612中的弱相关性相反，核心NGC108中的有机碳与生物蛋白石呈正相关。尽管两个岩心的古生产力估计值的最大值通常发生在冰川时期，但在最近一次，NGC108岩心的古生产力估计值，生物蛋白石/碳酸盐比和C_（有机）/ C_（碳酸盐）比值始终高于S2612核180 kyr，表明NGC108站点的地表水受北极水质量的影响要大于S2612站点。但是，相对于NGC108岩心，S2612岩心的蛋白石/碳酸盐比保持相当恒定，这可能意味着在氧同位素阶段（OIS）2/3边界，亚北极和中央水之间的过渡带在纬度上较窄， OIS 4和OIS6。已经在两个岩心中测量了13种无机元素的沉淀。根据各元素含量之间的相关性，将这些元素分为四类：（1）陆源成分（Al，Ti，Fe），（2）生物钙质物质（Ca，Sr），（3）生物清除元素（镁，Zn，Cr，Be）和（4）其他元素（Mn，Ba，Cu，Ni）。 NGC108核心的OIS 2、3、4和后期OIS 6的陆源质量聚集速率升高，而S2612核心的OIS 1早期，OIS 2、4和6较高。 MnO_2和Ba在次表面还原条件下可能会重新分布。尤其是颗粒反应性Be的沉淀，由于其短的停留时间（按海洋混合时间而定），可以通过增强陆源输入和生物垂直输送而加速沉淀，响应气候变化而大幅波动。

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