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Mineral provinces and matter provenance of the surficial sediments in the western philippine sea:implication for modern sedimentation in West Pacific marginal basin

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Acta Oceanologica Sinica 2007年第3期26卷 44-55页

作者： REN Xiangwen YAN Quanshu SHI Xuefa WANG Kunshan JIANG Xiaoli Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China Key Laboratory of Marine Sedimentology and Environmental Geology First Institute of Oceanography State Oceanic Adminis-tration Qingdao 266061 China Graduate School Chinese Academy of Sciences Beijing 100049 China

The characteristics and distribution patterns of detrital minerals （0. 063 -0. 125 mm） in marine sediments provide a significant indicator for the identification of the origin of sediment. The detrital mineral composition of 219 surface sediment samples was ana- lysed to identify the distribution of sediments within the western philippine sea. The area can be divided into three mineral provinces ：（Ⅰ） province east of the philippine Trench, the detrital minerals in this province are mainly composed of calcareous or siliceous organisms, with the addition of volcanogenic minerals from an adjacent island arc; （Ⅱ） middle mineral province, clastic minerals including feldspar, quartz and colorless volcanic glass, sourced from seamounts with intermediate-acid volcanic rock, or erupting intermediate-acid volcano; （Ⅲ） province west of the Palau--Kyushu Ridge, the matter provenance within this province is complex; the small quantity of feldspar and quartz may be sourced from seamounts or erupting volcano with intermediate - acid composition, with a component of volcanic scoria sourced from a volcano erupting on the Palau--Kyushu Ridge. it is suggested that, （ 1 ） Biogenic debris of the study area is closely related to water depth, with the amount of biogenic debris controlled by carbonate lysocline. （2） Volcaniclastic matter derived from the adjacent island arc can be entrained by oceanic currents and transported towards the abyssal basin over a short distance. The weathering products of volcanic rocks of the submarine plateau （e. g. , Benham Plateau） and adjacent ridges provide an important source of detrital sedimentation, and the influence scope of them is constrained by the intensity of submarine weathering. （3） Terrigenous sediments from the continent of Asia and the adjacent philippine island arc have little influence on the sedimentation of this study area, and the felsic mineral component is probably sourced from volcanic seamounts of intermediate-acid composition.

关键词： light mineral mineral province matter provenance western philippine sea

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Geochemistry of rare earth elements in the mid-late Quaternary sediments of the western philippine sea and their paleoenvironmental significance

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Science China Earth Sciences 2014年第4期57卷 802-812页

作者： XU ZhaoKai LI TieGang WAN ShiMing YIN XueBo JIANG FuQing SUN HanJie JinYong CHOI DhongIl LIM Key Laboratory of Marine Geology and Environment Institute of OceanologyChinese Academy of Sciences Department of Oceanography Kunsan National University South sea Institute Korea Institute of Ocean Science and Technology

Based on a δ180 chronology, rare earth elements （REE） and other typical elements in sediments from core MD06-3047 in the western philippine sea were analyzed to constrain the provenances of the sediments and investigate quantitative changes in the Asian eolian input to the study area over the last 700 ka. Among the competing processes that might affect REE compositions, sediment provenance is the most important one. Provenance analysis suggests that the study sediments have two provenance end-members; local volcanic sources are dominant, and eolian dust from the Asian continent has a smaller contribution. During glacial periods, eolian input to the western philippine sea was enhanced. In contrast, material supply from local volcanics in- creased during interglacial periods. Changes in eolian input to the study area were probably related to the strength of the East Asian winter monsoon （EAWM） as well as aridity in the Asian continent on an orbital time scale, and were partly influenced by local control factors on shorter time scales. Therefore, we propose that the present study expands the application of the REE-based method for quantitatively estimating the eolian component from the mid-latitude northern Pacific to the low-latitude western Pacific. Additionally, the study preliminarily confirms the influence of EAWM-transported eolian materi- al on sedimentation in the western philippine sea since 700 ka.

关键词： eolian dust sediment provenance rare earth elements East Asian winter monsoon glacial/interglacial cycle western philippine sea

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