{"title":"冲绳海槽沉积物的碎屑锆石U-Pb地质年代:对沉积来源的影响","authors":"Bao-Ju Yang, Ji-Hua Liu, Yong-Hua Wu","doi":"10.3389/feart.2024.1450319","DOIUrl":null,"url":null,"abstract":"In order to distinguish terrestrial material sources in the Okinawa Trough (OT), this study analyzed four surface sediment samples from the northern, middle, and southern parts of the OT using detrital zircon U-Pb age analysis. The detrital zircon age distributions in the northern Okinawa Trough (N-OT) predominantly fall into 1,000−2,300 Ma and 100−600 Ma age groups. In contrast, in the middle Okinawa Trough (M-OT) and southern Okinawa Trough (S-OT), the detrital zircon age groups of 100−600 Ma and 600–1,000 Ma increase significantly, while the age groups of 1,000−2,300 Ma and >2,300 Ma decrease. Detrital zircons from the N-OT primarily originate from the Yellow River and mixed with the Old Yellow River, while those from the M-OT come mainly from the Yellow River, Yangtze Rivers, and East China Sea. And Zhuoshui River maybe a potential source for the M-OT. The detrital zircons from the S-OT are mainly influenced by the Yangtze River, with some effects from the Lanyang River. This study utilizes detrital zircon U-Pb age analysis to gain a better understanding of the terrestrial material sources in various regions of the OT. Most of the zircon grain are coarse, with grain sizes of 40–150 μm long and 30–100 μm wide in the N-OT, smaller in the M-OT and S-OT in this study, which are probably not modern deposits, but the products in the low sea level period of last glaciation mixed with modern sediments. 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引用次数: 0
摘要
为了区分冲绳海槽(OT)中的陆地物质来源,本研究利用碎屑锆石 U-Pb 年龄分析方法对 OT 北部、中部和南部的四个表层沉积物样本进行了分析。冲绳海槽北部(N-OT)的碎屑锆石年龄分布主要分为 1,000-2,300 Ma 和 100-600 Ma 两个年龄组。相反,在冲绳海槽中部(M-OT)和冲绳海槽南部(S-OT),100-600 Ma和600-1,000 Ma的碎屑锆石年龄组明显增加,而1,000-2,300 Ma和>2,300 Ma的年龄组则有所减少。N-OT的碎屑锆石主要来源于黄河,并与老黄河混合,而M-OT的碎屑锆石主要来源于黄河、长江和东海。而卓水河可能是 M-OT 的潜在来源。S-OT的碎屑锆石主要受长江影响,兰阳河也有一些影响。本研究利用碎屑锆石U-Pb年龄分析来更好地了解OT各地区的陆地物质来源。在本研究中,大部分锆石颗粒较粗,在N-OT中粒径长40-150微米,宽30-100微米,在M-OT和S-OT中粒径较小,可能不是现代沉积物,而是末次冰川低海平面时期与现代沉积物混合的产物。其运移和沉积过程反映了从末次冰川期至今海平面变化、黑潮、河流输入、东亚季风等因素的综合影响。
Detrital zircon U-Pb geochronology of sediments from the Okinawa Trough: implications for sedimentary provenance
In order to distinguish terrestrial material sources in the Okinawa Trough (OT), this study analyzed four surface sediment samples from the northern, middle, and southern parts of the OT using detrital zircon U-Pb age analysis. The detrital zircon age distributions in the northern Okinawa Trough (N-OT) predominantly fall into 1,000−2,300 Ma and 100−600 Ma age groups. In contrast, in the middle Okinawa Trough (M-OT) and southern Okinawa Trough (S-OT), the detrital zircon age groups of 100−600 Ma and 600–1,000 Ma increase significantly, while the age groups of 1,000−2,300 Ma and >2,300 Ma decrease. Detrital zircons from the N-OT primarily originate from the Yellow River and mixed with the Old Yellow River, while those from the M-OT come mainly from the Yellow River, Yangtze Rivers, and East China Sea. And Zhuoshui River maybe a potential source for the M-OT. The detrital zircons from the S-OT are mainly influenced by the Yangtze River, with some effects from the Lanyang River. This study utilizes detrital zircon U-Pb age analysis to gain a better understanding of the terrestrial material sources in various regions of the OT. Most of the zircon grain are coarse, with grain sizes of 40–150 μm long and 30–100 μm wide in the N-OT, smaller in the M-OT and S-OT in this study, which are probably not modern deposits, but the products in the low sea level period of last glaciation mixed with modern sediments. The transport and sedimentation processes reflect the comprehensive influence of sea level change, Kuroshio Current, river input, East Asian monsoon and other factors from last glaciation to present.
期刊介绍:
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