發(fā)布時間：2018-02-09 22:36

  本文關(guān)鍵詞： 磁性地層學(xué) 沉積速率 構(gòu)造活動 渤海灣西岸　出處：《海洋地質(zhì)與第四紀(jì)地質(zhì)》2016年04期 　論文類型：期刊論文

【摘要】：對渤海灣西岸孔深503.22m的CH500孔進行了詳細(xì)的磁性地層學(xué)研究,基于377個交變退磁樣品分離出的特征剩磁,建立了鉆孔的磁性地層,并與標(biāo)準(zhǔn)極性年表相對比,確定了極性時和極性亞時,在此基礎(chǔ)上探討了該孔年代地層劃分及其區(qū)域構(gòu)造意義。結(jié)果表明:本鉆孔B/M界限深度119.5m,M/G界限深度為359.1m,鉆孔底部位于C2An.2r內(nèi),其年齡應(yīng)小于3.33 Ma。通過與渤海灣西北岸的其他鉆孔對比,發(fā)現(xiàn)各鉆孔的B/M界限深度和M/G界限深度存在較大的不同,反映了不同的級次構(gòu)造單元地層厚度的差異。這一研究為該鉆孔提供了可靠的年代標(biāo)尺,為渤海灣西岸第四系地層劃分和對比提供了新的依據(jù)。
[Abstract]:A detailed magnetic stratigraphic study of the CH500 hole with a depth of 503.22m in the west coast of Bohai Bay has been carried out. Based on the characteristic remanence of 377 alternating demagnetization samples, the magnetic strata of the borehole have been established and compared with the standard polarity chronograph. Based on the determination of polarity time and polarity sub-time, the chronostratigraphic division of the borehole and its regional tectonic significance are discussed. The results show that the B / M boundary depth of this borehole is 119.5 m / M / G limit depth is 359.1 m, and the bottom of the borehole is located within C _ 2An.2r. Its age should be less than 3.33 Ma.Through comparison with other boreholes in the northwestern coast of Bohai Bay, it is found that the B / M boundary depth and M / G boundary depth of each borehole are quite different. This study provides a reliable age scale for the borehole and provides a new basis for the division and correlation of the Quaternary strata in the west coast of Bohai Bay.
【作者單位】： 天津地質(zhì)礦產(chǎn)研究所;Centre
【基金】：中國地質(zhì)調(diào)查“天津濱海新區(qū)地質(zhì)環(huán)境調(diào)查評價(1212011120089)”項目
【分類號】：P539.3;P736.22
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本文編號：1499017