冲绳海槽北段表层沉积物中底栖有孔虫分布的研究  

RECENT BENTHIC FORAMINIFERAL DISTRIBUTIONS IN THE NORTHERN PART OF OKINAWA TROUGH

作　　者：李铁钢[1] 苍树溪[1] 阎军[1] 

机构地区：[1]中国科学院海洋研究所,青岛266071

出　　处：《海洋与湖沼》1997年第1期49-55,共7页Oceanologia Et Limnologia Sinica

基　　金：国家自然科学基金!49105059

摘　　要：对1992年5月取自冲绳海槽北段（水深113-1156m，东经126°58.71'-129°9.06’，北纬28°41.75'-31°40.56'）92个表层沉积物中的底栖有孔虫数据进行R型因子分析。分析表明，黑潮流系有4个不同垂直水团的底栖有孔虫群落组合。其中Pseudorotaliaindopacifica,Bolovinarobusta,Cibicidesmargaritiferus,Textulariasaggitula,Cibicideslobatulus和Quinqueloculinaspp.代表黑潮流系的表层水;Hyalineabalthica，Caribeanelladepressa,Cibicidespraecinctus，Planulinawuellerstorfi和Melonisaffinis代表黑潮流系的次表层水;Globobuliminapacifica,Globocassidulinasubglobosa和Trifarinaspp.代表黑潮流系的中层水;Oridorsalistener,Martionottiellaokinawaensis,Pulleniaquinqueloba和Uvigerinadirupta代表黑潮流系的深层水。Numerical analysis of benthic foraminiferal relative-abundance data from 92 surface samples taken from the northern part of the Okinawa Trough(113 -1156m. 126' 58.7l, - 129 9.O6. E, 28' 4l.75, - 3l 40.56. N) in May of 1992 distinguishes separate thanatotopes and faunal assemblages related to the four water masses present within the depth range of the samples. Four significant factors identi fied by the R-mode factor analysis based on 36 species, account for 68% of the total variance.Factor 1 accounts for 41% of the variance. Eighteen species belong to this assemblage. Pseudorotalia indopacifica, Bolivina robusta, Cibicides margaritiferus,Textulario saggitula and Cibicides lobatulus show the highest scores. A depth plot of the factor scores demonstrates that all significant scores are for samples taken from waters between 1(X)- l5OIn. Therefore, this assemblage is particularly associated with the Kuroshio Surface Water (KSW.Factor 2 explains 12% of the variance. Eight species have significant positive loadings on this factor, and the strongest loading being shown by Hyalinea balthica,Caribeanella depress, Ptonulina wuellerstorfi and Melonis offinis. The factor scoresshow the the sighficant positive values are typical of the 15O - 5OOIn illterval,approalmately the depth range of the Kuroshio High-Salinity Water (KHSW.Factor 3 accounts for 8.5% of the variance Significant positive loadings are shown by 6 species. Among them Globobulimina pacifica, Globocassidulina subgobosa and Tnfrina SPP. are the moct irnportant comnporents this assemblage. The factor-score plot shewi that all sitwicant scores are for samples taken from waters between 3(X)- 8OOIn,corresponding to the Subarctic Intermediate Water (SIW.Factor 4 explains 6.5% of the variance. Four species Of Chborsalis tener,Martinotticlla okinawaensis, Pullenta qutwuetoba and Uvlerrina dmpta have strong loadingr on this factor. The plot of factor scores shows that this assemblage is best developed within the Oldnawa Trough Deep Water (OMW) in the 7(X) - 1O5Om depth

关 键 词：底栖 有孔虫 群落组合 海槽 沉积物 第四纪 冲绳 

分 类 号：Q915.811.1[天文地球—古生物学与地层学] P736.221[生物学—古生物学]