Geochemical and Stable Isotopic Studies of Celebes and Sulu Sea Sediments: Sites 767 and 768,　ODP Leg 124

海洋鑽探計畫124航次767和768號巖心之地球化學與穩定同位素研究

許德惇(David Der-Duen Sheu)

《Terrestrial, Atmospheric and Oceanic Sciences》 2卷3期 (1991/09) Pp. 267-279

摘要

本研究分析了兩根來自西裏伯斯和蘇魯海盆岩心樣品（海洋鑽探計劃124航次；岩心編號767和768）之碳酸監，有機碳和還原硫之含量，以及碳酸監中碳氧同位素之組成，並據以探討其在岩心中垂直變化和已知海盆演育過程之地化關系。結果顯示碳酸監，有機碳和還原硫在岩心中不同深度之變化主要爲沈積物來源和沈積作用之不同所臻。另外，碳氧同位素在碳酸監中之值均隨濃度之增加而遞減，且碳同位素值之變化較氧同位素值爲大並較不夫則。氧同位素之遞減趨勢顯然和海盆演育過程中之劇烈火山活動，盆地深化和沈積物堆積之結果有關；而碳同位素呈現較大之負值和多變則表示其碳酸監來源之不同，且有部分碳酸監中之碳在高溫變質形成過程中或少括了有機來源之碳分子。

並列摘要

This paper presents the depth distributions of sediment organic carbon, total reduced sulfides, and carbon and oxygen isotopic compositions of carbonates from Sites 767 and 768, ODP Leg 124 in the Celebes and Sulu Sea Basins. Carbonate, organic carbon and sulfide profiles have probably been complicated by changes in sediment organic source input and mode of sedimentation as well as variations in carbonate content during the tectonic development of the basins. 6180 and 5130 of carbonates both generally become lighter with increasing depth. 6’3C is more variable than 18Q• The progressive decrease in 318Q with depth may indicate diagenetic formation of carbonates at elevated temperature induced by deep burial and volcanic activity. The highly variable and negative 513C values in the carbonates indicate an organically-derived CO2 origin of carbon in diagenetic carbonate components.