Molybdenum isotopic records across the Precambrian-Cambrian boundary
Molybdenum isotopic records across the Precambrian-Cambrian boundary
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跨越前寒武纪-寒武纪边界的钼同位素记录
DOI：
10.1130/g32055.1
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发表时间：
2011-08
期刊：
影响因子：
5.8
通讯作者：
Liu Shirong
中科院分区：
文献类型：
--
作者：
Wen Hanjie;Carignan Jean;Zhang Yuxu;Fan Haifeng;Cloquet Christophe;Liu Shirong
中国南部寒武纪早期地层的钼（Mo）同位素数据证明了非微生沉积物作为同时代海水钼记录的有希望的档案的重要性。与非植物、非骨架碳酸盐类似，我们首次报道原始磷岩也可以保存环境流体，这使得原始磷岩成为记录同时代古海水的新的潜在指纹工具。中国南方两个早寒武世地层的原始磷矿和白云石样本表明，早寒武世海水的δ 97/95 Mo 值可能至少为1.4‰，与现代海洋相似。从再加工的磷矿中获得了低 δ 97/95 Mo（低至 -0.5‰）值，但有证据表明这些反映的 Mo 与 Fe 羟基氧化物矿物有关，而不是同时代的海水。相比之下，位于寒武纪过渡之下的晚前寒武纪白云岩表明，同期海水的 δ 97/95 Mo 略重于中元古代（0.9‰–1‰ 与 0.8‰），这表明当时海洋环流模式可能已经彻底重组，并可能引发了从埃迪卡拉纪到寒武纪早期的生物多样性。
Molybdenum (Mo) isotopic data from early Cambrian formations in southern China demonstrate the importance of non-euxinic sediments as a promising archive for coeval seawater Mo records. For the first time, in analogue to noneuxinic, nonskeletal carbonates, we report that the pristine phosphorites also can preserve the ambient fluid, which make the pristine phosphorites a new potential fingerprinting tool to record the coeval paleoseawater. Pristine phosphorite and dolomite samples of two early Cambrian formations in southern China suggest that early Cambrian seawater may have had δ 97/95 Mo values of at least 1.4‰, similar to modern oceans. Low δ 97/95 Mo (as low as −0.5‰) values were obtained from reworked phosphorite, but evidence suggests that these are reflecting Mo related to Fe oxyhydroxide minerals rather than the coeval seawater. In contrast, late Precambrian dolomite just below the transition to the Cambrian would indicate a δ 97/95 Mo of coeval seawater slightly heavier than that of the Mesoproterozoic (0.9‰–1‰ versus 0.8‰), suggesting that oceanic circulation patterns may have been thoroughly reorganized by that time, and may have triggered biological diversification from the Ediacaran to the early Cambrian.
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