The inner shelf sediments of the East China Sea (ECS) preserve valuable information regarding climatic changes on land through detrital material discharged from large rivers, particularly the Yangtze River. In this paper, we examine the provenance changes of fine-grained detrital quartz preserved in the sediment of the MD06-3040 core retrieved from the mud belt on the inner shelf of the ECS during the last 6 kyrs. The provenance of the fine silt fraction (4–16 μm) of the sediments, which is considered to represent the suspended particulate matter (SPM) from the Yangtze River, is estimated based on the electron spin resonance (ESR) signal intensity and crystallinity index (CI) of quartz. By comparing the ESR signal intensity and CI of quartz in the fine silt fraction of sediments to those from different parts of tributaries in the modern Yangtze River drainage, we can discriminate the SPM sourced from the northwestern and southeastern tributaries of the Yangtze River. Shifts in the East Asian summer monsoon (EASM) front are monitored by changes in the main precipitation areas which are manifested as changes in source rock ages and types implied from the ESR signal intensity and CI of quartz in the fine silt fraction of the studied sediments discharged from the Yangtze River. Temporal changes in provenance of the fine silt fraction through time suggest that shifts in the main location of EASM precipitation (most likely representing the EASM front) occurred at a multi-centennial-to-millennial scale with the deepest northwestward penetration of the EASM precipitation front (an enhanced EASM) occurring during the period 3.5–2.0 kyr BP and a southeastward retreat (a weak EASM) occurring during the periods 6.0–4.1 and 2.0–0 kyr BP.

中文翻译：

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在最近6 kys的东亚夏季风季风前移带来的东海内陆架沉积物中细碎屑石英的物源变化

东海（ECS）的内陆沉积物通过从大型河流（尤其是长江流域）排放的碎屑，保留了有关陆地气候变化的宝贵信息。在本文中，我们检查了在最近6个月内从ECS内陆架泥带中获取的MD06-3040岩心沉积物中保存的细粒碎屑石英的物源变化。根据电子自旋共振（ESR）信号强度和结晶度指数估算了沉积物的细粉质颗粒物（4–16μm）的来源，被认为是长江中的悬浮颗粒物（SPM）。 （CI）石英。通过将沉积物细粉质部分中石英的ESR信号强度和CI与现代长江支流不同支流部分中的石英的ESR信号强度和CI进行比较，可以区分出源自长江西北支流和东南支流的SPM。东亚夏季风（EASM）前缘的变化通过主要降水区的变化来监测，这些变化表现为研究沉积物细粉质部分中ESR信号强度和石英CI所暗示的源岩年龄和类型的变化。从长江排放。