Provenance of colorless and brown volcanic glass in late Pleistocene tephra layers in the Western Philippine Sea

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外文摘要：Tephra layers in the western Philippine Sea,characterized by abundant volcanic glass shards,may provide crucial evidence on the eruption history of volcanoes and tectonic evolution of the western Pacific.A 220-ka sediment core from the Benham Rise in the western Philippine Sea offers new insights into the provenance of four intercalated tephra layers(T1-T4,in chronological order)containing either colorless or brown glass shards.Relative to primitive mantle,all glass shards are enriched in large-ion lithophile elements,such as Rb,Cs,and Pb,and depleted in high field-strength elements,such as Th,Nb,and Ta,indicating a subduction-related origin.The colorless glass shards are characterized by high SiO2(＞78％)and light rare earth element(LREE)contents as well as high La/Sm ratios(＞9),low FeO and MgO contents(＜1％),low Sr/Y(＜15)and high Ba/Th ratios(＞100),pointing to a rhyolitic composition and a medium-K calc-alkaline serial affinity.In contrast,the brown glass shards are characterized by lower SiO2(＜63％)and LREE contents,higher FeO,MgO,and CaO contents,lower La/Sm(＜6)and Ba/Th(＜75),and similar Sr/Y ratios(＜15),indicating derivation from medium to high-K calc-alkaline andesite magma.Brown glass shards from layers T3(152 ka)and T4(172 ka)were correlated with volcanic deposits from the Taal and Laguna Caldera in the Maccolod Corridor,respectively,while the colorless glass shards from layers T1(36.5 ka)and T2(61.2 ka)were likely sourced from the Irosin Caldera in the Bicol Arc.Establishing the provenance of late Pleistocene tephra layers in the western Philippine Sea is helpful to complement a Philippine volcanic history and establish a regional tephro-chronostratigraphy.

外文关键词：

volcanic glassprovenancechemical compositionPhilippine Sealate Pleistocene

作者：

Fuqing JIANG、Zhishun ZHANG、Zhaohui ZHANG、Guoliang ZHANG、Peng HUANG、Xiaojing ZHOU、Zhifang XIONG、Congying LI、Tiegang LI

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作者单位：

Key Laboratory of Ocean Observation and Forecasting and Key Laboratory of Marine Geology and Environment,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China

Laboratory for Marine Geology,Qingdao Marine Science and Technology Center Qingdao 266237,China

University of Chinese Academy of Sciences,Beijing 100049,China

Institute of Marine Chemistry and Environment,Ocean College,Zhejiang University,Zhoushan 316021,China

College of Marine Technology and Environment,Dalian Ocean University,Dalian 116023,China

Key Laboratory of Marine Sedimentology and Environmental Geology,First Institute of Oceanography,Ministry of Natural Resources,Qingdao 266061,China

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基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaStrategic Priority Research Program of the Chinese Academy of SciencesLaoshan Laboratory

项目编号：

4207604942376050XDB42000000LSKJ202204201

出版年：

2024

DOI：

10.1007/s00343-024-3182-1

海洋湖沼学报(英文版)

中国海洋湖沼学会

海洋湖沼学报(英文版)

CSTPCD

影响因子：0.386

ISSN：2096-5508

年,卷(期)：2024.42(5)