220 ka以来西菲律宾海黏土矿物输入变化及其控制因素  

Variation in clay mineral input and the control factors in the Western Philippine Sea since 220 ka

作　　者：蒋富清[1,2,3,4] 周晓静 李传顺 JIANG Fuqing;ZHOU Xiaojing;LI Chuanshun(Key Laboratory of Marine Geology and Environment,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China;Center for Ocean Mega-Science,Chinese Academy of Sciences,Qingdao 266071,China;University of Chinese Academy of Sciences,Beijing 100049,China;Laboratory for Marine Geology,Laoshan Laboratory,Qingdao 266237,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)

机构地区：[1]中国科学院海洋研究所,中国科学院海洋地质与环境重点实验室,青岛266071 [2]中国科学院海洋大科学研究中心,青岛266071 [3]中国科学院大学,北京100049 [4]崂山实验室海洋地质过程与环境功能实验室,青岛266237 [5]大连海洋大学海洋科技与环境学院,大连116023 [6]自然资源部第一海洋研究所,青岛266061

出　　处：《海洋地质与第四纪地质》2023年第5期85-95,共11页Marine Geology & Quaternary Geology

基　　金：国家自然科学基金“西太平洋暖池8.5 Ma以来风尘输入变化及其古气候效应”(42076049);崂山实验室科技创新项目“新生代西太平洋环境演化的沉积记录及机制”(LSKJ20224200);中国科学院战略性先导科技专项“印太交汇区海洋物质能量中心形成演化过程与机制”(XDB42000000);辽宁省教育厅项目“北黄海西部陆架环流与沉积体系”(JL201905)。

摘　　要：为揭示晚更新世以来西太平洋暖池黏土矿物输入变化的控制因素,对采自西菲律宾海本哈姆隆起上的Ph05-5孔沉积物中的黏土矿物组成、来源和堆积速率进行了分析。结果表明,220 ka以来,该孔沉积物中的黏土矿物主要以伊利石(13%)和蒙皂石(8%)为主,其次为绿泥石(6%)和高岭石(2%)。伊利石和绿泥石主要来源于亚洲大陆,蒙皂石主要源于菲律宾海周围岛屿的火山物质在海底遭受海水侵蚀后形成的自生Fe-蒙皂石和西菲律宾海周围岛屿上的物质风化后形成的他生Al-蒙皂石。220 ka以来,伊利石和绿泥石的堆积速率表现出明显的冰期高-间冰期低的旋回变化,与该孔总的风尘堆积速率、亚洲风尘和北太平洋风尘堆积速率一致。冰期/间冰期太阳辐射降低/增强、亚洲内陆干旱程度加强/减弱,是导致伊利石等源于亚洲内陆的黏土矿物向菲律宾海输入增加/减少的主控因素。Ph05-5孔蒙皂石的堆积速率同样表现出明显的冰期高-间冰期低的特征,与该孔总的火山物质堆积速率一致。蒙皂石在轨道尺度的变化,主要受到海平面变化和热带类ENSO过程影响的降雨过程控制。冰期低海平面,菲律宾岛和海水的混合作用加强,使得蒙皂石的输入增加。此外,冰期在热带太平洋类拉尼娜较强,降雨量增加,导致向菲律宾海输入的火山物质(蒙皂石)增加,间冰期则相反,由于类厄尔尼诺增强,菲律宾岛区域干旱,火山物质(蒙皂石)向菲律宾海的输入减少。To reveal the controlling factors of clay minerals input in the Western Pacific Warm Pool since the Late Pleistocene,we analyzed the composition,source,and mass accumulation rates(MARs)of clay minerals in the sediment from Core Ph05-5 recovered from the Benham Rise in the Western Philippine Sea.The results indicate that the clay minerals in the core sediment are mainly composed of illite(13%)and smectite(8%),followed by chlorite(6%)and kaolinite(2%).Over the last 220 ka,illite and chlorite are derived mainly from the Asian continent,and smectite is mainly authigenic Fe-smectite in volcanic origin from islands around the Philippine Sea after erosion by seawater at the seabed,and smectite formed by weathering of volcanic material from islands around the West Philippine Sea.The MARs of illite and chlorite displayed significant high value during the glacial period and low value during the interglacial period,which is consistent with the total MARs of eolian dust of Core Ph05-5,MARs of Asian dust and North Pacific dust over the last 220 ka.The decrease/enhancement of solar radiation during the glacial/interglacial period,as well as the strengthening/weakening of arid in Asian continent are the main controlling factors for the increase/decrease in the input of clay minerals,such as illite from Asian continent into the Philippine Sea.The MARs of smectite in Core Ph05-5 also exhibits high value during the glacial period and low value during interglacial period,which is consistent with the total MARs of the volcanic material in Core Ph05-5.The changes of smectite in the orbital scale are mainly controlled by global sea level change and precipitation influenced by tropical ENSO processes.The low sea level during the glacial period resulted in the strengthened mixing effect between the Philippine Island and seawater,and led to an increase of smectite input in the Philippine Sea.In addition,during the glacial period,La Niña-like process was stronger in the tropical Pacific,resulting in an increase in rainfall and increased

关 键 词：黏土矿物 堆积速率 晚更新世 西菲律宾海 

分 类 号：P736.21[天文地球—海洋地质]