本文選題：西菲律賓海 + 磁學(xué)特征�。� 參考：《地學(xué)前緣》2017年03期

【摘要】：對(duì)取自西菲律賓海西部的GX149柱狀樣沉積物進(jìn)行詳細(xì)的環(huán)境磁學(xué)研究,揭示其蘊(yùn)含的環(huán)境意義和物源信息。巖石磁學(xué)結(jié)果表明,GX149柱狀樣沉積物中攜磁礦物以低矯頑力磁鐵礦為主;反映磁性顆粒粒徑的King圖與Day圖顯示沉積物中磁性礦物以準(zhǔn)單疇(PSD)為主。剖面上磁學(xué)參數(shù)變化明顯,以磁性礦物粒徑參數(shù)(χARM/χ)作為替代指標(biāo)反演古氣候變化結(jié)果顯示:冷期沉積物中磁性礦物含量相對(duì)更高,粒徑更粗,高矯頑力礦物含量增加;而暖期沉積物中磁性礦物含量相對(duì)較低,粒徑更細(xì),高矯頑力礦物含量降低。干燥、寒冷、風(fēng)大的冷期氣候下,東亞季風(fēng)攜帶的粉塵輸入增加導(dǎo)致沉積物中高矯頑力礦物含量增多;而溫暖濕潤(rùn)的暖期,沉積物中風(fēng)成粉塵輸入減少,高矯頑力礦物含量降低。GX149柱狀樣沉積物與西菲律賓海其他區(qū)域以及南海沉積物相似的磁學(xué)特征,相同的冰期-間冰期旋回趨勢(shì)說(shuō)明沉積物磁學(xué)特征對(duì)氣候變化的響應(yīng)在東亞地區(qū)具有共性。
[Abstract]:A detailed environmental magnetic study of GX149 columnar sediments from the west of the western Philippine Sea was carried out to reveal the environmental significance and provenance information contained therein. The results of rock magnetism show that the magnetic carrying minerals in the columnar sediments of GX149 are mainly low coercivity magnetite, and the King and Day diagrams reflecting the particle size of magnetic particles show that the magnetic minerals in the sediments are quasi-single-domain PSDs. The magnetic parameters changed obviously in the section. The paleoclimate change was inversed by the magnetic mineral particle size parameter (蠂 ARM/ 蠂). The results showed that the content of magnetic minerals was higher, the diameter of magnetic minerals was larger, and the content of high coercivity mineral was higher in cold period sediment. However, the content of magnetic minerals in warm sediments is relatively low, the particle size is smaller, and the content of high coercivity minerals is lower. In the dry, cold and windy climate, the dust input from the East Asian monsoon increases the content of high coercivity minerals in the sediments, while in the warm and humid warm period, the dust input from the sediment is reduced. Reduction of high coercivity mineral content. GX149 columnar sediments have similar magnetic characteristics to other areas of the West Philippine Sea and the South China Sea. The same trend of glacial to interglacial cycles indicates that the magnetic response of sediments to climate change is common in East Asia.
【作者單位】： 國(guó)土資源部海底礦產(chǎn)資源重點(diǎn)實(shí)驗(yàn)室;中國(guó)地質(zhì)調(diào)查局廣州海洋地質(zhì)調(diào)查局;中國(guó)地質(zhì)調(diào)查局;廣東省有色地質(zhì)勘查院;
【基金】：國(guó)土資源部海底礦產(chǎn)資源重點(diǎn)實(shí)驗(yàn)室開(kāi)放基金課題(KLMMR-2014-A-12) 國(guó)家自然科學(xué)基金項(xiàng)目(41306042,41272384) 中國(guó)地質(zhì)調(diào)查局地質(zhì)調(diào)查項(xiàng)目(GZH201300502,GZH201500202)
【分類號(hào)】：P736.21
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本文編號(hào)：1848299