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首頁> 美國衛(wèi)生研究院文獻>Wiley-Blackwell Online Open >The Origin of Carbonate Veins Within the Sedimentary Cover and Igneous Rocks of the Cocos Ridge: Results From IODP Hole U1414A
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The Origin of Carbonate Veins Within the Sedimentary Cover and Igneous Rocks of the Cocos Ridge: Results From IODP Hole U1414A

機譯：Cocos山脊沉積蓋和火成巖中碳酸鹽脈的成因：來自IODP孔U1414A的結(jié)果

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Carbonate veins in the igneous basement and in the lithified sedimentary cover of the Cocos Ridge at International Ocean Discovery Program (IODP) Hole 344‐U1414A reveal the hydrologic system and fluid‐rock interactions. IODP Hole 344‐U1414A was drilled on the northern flank of the Cocos Ridge and is situated 1 km seaward from the Middle America Trench offshore Costa Rica. Isotopic and elemental compositions were analyzed to constrain the fluid source of the carbonate veins and to reveal the thermal history of Hole 344‐U1414A. The formation temperatures (oxygen isotope thermometer) of the carbonate veins in the lithified sedimentary rocks range from 70 to 92 °C and in the basalt from 32 to 82 °C. 87Sr/86Sr ratios of the veins in the altered Cocos Ridge basalt range between 0.707307 and 0.708729. The higher ratios are similar to seawater strontium ratios in the Neogene. 87Sr/86Sr ratios lower 0.7084 indicate exchange of Sr with the igneous host rock. The calcite veins hosted by the sedimentary rocks are showing more primitive 87Sr/86Sr ratios <0.706396. The isotopic compositions indicate seawater, modified into a hydrothermal fluid by subsequent heating, as the main fluid source. Low‐temperature alteration and the presence of a high‐temperature fluid resulted in different carbonate precipitates forming up to several cm thick veins. The geochemical data combined with age data of the sedimentary rocks suggest intraplate seamount volcanism in the area between the Galapagos hot spot and the Cocos Island as an additional heating source, after the formation of the Cocos Ridge at the Galapagos hot spot.
機譯：國際海洋發(fā)現(xiàn)計劃（IODP）孔344-U1414A的火成巖基底和科科斯山脊的石化沉積蓋層中的碳酸鹽巖脈揭示了水文系統(tǒng)和流體-巖石相互作用。 IODP孔344-U1414A在Cocos Ridge的北翼上鉆出，位于距離中美洲海溝哥斯達黎加近海1公里處。分析了同位素和元素組成，以限制碳酸鹽巖脈的流體源，并揭示Hole 344-U1414A的熱歷史。巖石化沉積巖中碳酸鹽巖脈的形成溫度（氧同位素溫度計）范圍為70至92°C，玄武巖中為32至82°C。改變后的Cocos Ridge玄武巖中的 87 Sr / 86 Sr比值介于0.707307和0.708729之間。較高的比率類似于新近紀中的海水鍶比率。 87 Sr / 86 Sr比值低至0.7084，表明Sr與火成巖的交換。沉積巖中的方解石脈顯示出更原始的 87 Sr / 86 Sr比<0.706396。同位素組成表明海水是主要的流體源，通過隨后的加熱將其轉(zhuǎn)化為熱液。低溫變化和高溫流體的存在導致不同的碳酸鹽沉淀物形成長達幾厘米厚的脈。地球化學數(shù)據(jù)與沉積巖的年齡數(shù)據(jù)相結(jié)合，表明在加拉帕戈斯熱點處的科科斯山脊形成之后，加拉帕戈斯熱點和科科斯島之間的板塊內(nèi)海山火山活動是一種額外的熱源。

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