首页> 外文期刊>Applied Geochemistry: Journal of the International Association of Geochemistry and Cosmochemistry >Metal sources of black smoker chimneys, Endeavour Segment, Juan de Fuca Ridge: Pb isotope constraints
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Metal sources of black smoker chimneys, Endeavour Segment, Juan de Fuca Ridge: Pb isotope constraints

机译:黑烟囱烟囱的金属来源,奋进段,胡安·德富卡岭:铅同位素约束

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摘要

Hydrothermal chimney sulfides, vent cap chimney samples, Fe-oxide and basalts from sediment-starving Juan de Fuca Ridge, in the Endeavour segment, exhibit a range of Pb isotope ratios (Pb-206/Pb-204 = 18.658-18.769: Pb-207/Pb-204 = 15.457-15.566; Pb-208/Pb-204 = 37.810-38.276). The data array is not parallel to the northern hemisphere mantle reservoirs indicating a possible sediment component within the sulfides. By assuming that the potential end-member sediment component has a Pb-207/Pb-204 (15.70) similar to Middle Valley sediment, it is suggested the potential end-member sediment component may have Pb-206/Pb-204 = 18.90: Pb-208/Pb-204 = 38.82. Basalt-derived Pb for the Endeavour segment hydrothermal system involves about 50/50 leaching of E-MORB and T2-MORB. Detailed observations show the Mothra field derives more Pb from T2-MORB than the Main Endeavour field does. According to the binary mixing model, the results show little Pb (<1.5%) or no Pb derivation from sedimentary sources. However, the high NH4+, CH4 and Br/Cl ratios in hydrothermal fluids are consistent with a sediment component within the segment. Reconciling the Pb isotope data with the chemistry data of hydrothermal fluids, it is suggested that the sediment component may be located in a lower temperature recharge zone where Pb could not be mobilized from the sediment.
机译:努力奋斗段中因缺乏沉积物的胡安·德富卡岭的热液烟囱硫化物,排气帽烟囱样品,氧化铁和玄武岩表现出一系列的铅同位素比(Pb-206 / Pb-204 = 18.658-18.769:Pb- 207 / Pb-204 = 15.457-15.566; Pb-208 / Pb-204 = 37.810-38.276)。数据阵列不平行于北半球地幔储层,表明硫化物中可能存在沉积物成分。通过假设潜在的最终成员沉积物成分具有类似于中谷沉积物的Pb-207 / Pb-204(15.70),建议潜在的最终成员沉积物成分可能具有Pb-206 / Pb-204 = 18.90: Pb-208 / Pb-204 = 38.82。用于奋进段热液系统的玄武岩衍生的铅涉及E-MORB和T2-MORB的约50/50浸出。详细的观察结果显示,与主要努力场相比,Mothra场从T2-MORB衍生出更多的Pb。根据二元混合模型,结果表明沉积物中几乎没有铅(<1.5%)或没有铅。但是,热液中的高NH4 +,CH4和Br / Cl比值与该段内的沉积物成分一致。将Pb同位素数据与热液流体的化学数据进行核对,表明沉积物成分可能位于较低温度的补给区,在该区域中Pb无法从沉积物中迁移出来。

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