REE and Sr-Nd isotope characteristics of hydrothermal chimney at Jade area in the Okinawa Trough-中国Betway体育网页登陆

摘要 Hydrothermalchimneyisaproductofhydrothermalactivityontheseabed.ChimneysamplesdredgedfromJadehydrothermalareainIzenadepressionoftheOkinawaTrough,arecharacterizedbyrelativelyenrichedlightrareearthelements(LREE)andstronglypositiveEuanomalies.87Sr/86Srand143Nd/144Ndofthesesamplesareexactlybetweenthoseofseawaterandofacidicpumice,averagedat0.708928and0.512292,respectively.ThesecharacteristicsimplythatthemainsourceofhydrothermalsulfideatJadeareaispossiblytheundersurfaceacidicrocks.Themineralizingmechanismcanbesummarizedasfollows:LargeamountofmineralizedmaterialwouldbeleachedoutandLREEenrichedhydrothermalsolutionwouldbesubsequentlyproducedasaresultofthermo-chemicalexchangereactionbetweenacidicvolcanicrocksandheatedseawaterthatpenetratedinadvancefromupperwatermass.ThespurtingoutfromtheseabedandquicklycrystallizingintheseawaterofhydrothermalsolutionareresponsiblefortheformationofCu-Znsulfideandbarite-amorphousSiO2mineralsthatarecharacterizedbyenrichedLREEandpositivelystrongEuanomalies.

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REE and Sr-Nd isotope characteristics of hydrothermal chimney at Jade area in the Okinawa Trough

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