Premium
The Combined Effect of Tibetan Plateau Uplift and Glacial‐Interglacial Cycles on the Quaternary Evolution of the East Asian Monsoon: Evidence from South China Sea Sediments
Author(s) -
MENG Xianwei,
LIU Yanguang,
ZHANG Xiaodong,
ZHANG Jun
Publication year - 2014
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.12221
Subject(s) - geology , interglacial , glacial period , east asian monsoon , siliciclastic , quaternary , plateau (mathematics) , monsoon , fluvial , oceanography , last glacial maximum , aeolian processes , geomorphology , paleontology , facies , mathematical analysis , mathematics , structural basin
The siliciclastic sediments of the uppermost section of 185 mcd (meters composite depth) from ODP Site 1146 on the northern continental slope of the South China Sea (SCS) were partitioned according to their sources using end‐member modeling on grain‐size data. The goal was to evaluate the evolution of the East Asian monsoon over the past 2 million years. The siliciclastic sediments were described as hybrids of four end‐members, EM1, EM2, EM3, and EM4, with modal grain sizes of 8–22 μm, 2–8 μm, 31–125 μm, and 4–11 μm, respectively. EM1 and EM3 are interpreted as eolian dust and EM2 and EM4 as fluvial mud. The ratio of eolian dust to fluvial mud ((EM1+EM3)/(EM2+EM4)) is regarded as an indicator of the East Asian monsoon. The variation in this ratio not only shows periodical oscillations consistent with oxygen isotope stages, but also exhibits a phased increasing trend corresponding with the phased uplifts of the Tibetan Plateau, indicating that the evolution of the East Asian Monsoon was controlled not only by glacial‐interglacial cycles, but also by the phased uplifts of the Tibetan Plateau during the Quaternary.