【摘要】：燕遼地區(qū)霧迷山組下、中部主體屬海進(jìn)階段的層序旋回,以發(fā)育對(duì)稱型相序組構(gòu)為特征,但上部表現(xiàn)為強(qiáng)迫型海退過(guò)程,層序旋回特征未有精細(xì)的研究。為此,筆者等選擇京西永定河莊戶洼剖面的霧迷山組第4段開(kāi)展系統(tǒng)的沉積微相、沉積相序和層序地層學(xué)、化學(xué)地層學(xué)研究,用以恢復(fù)沉積相和劃分副層序類型,并通過(guò)碳、氧同位素組成和相關(guān)數(shù)據(jù)分析的方法驗(yàn)證古環(huán)境的演變過(guò)程。莊戶洼剖面中共識(shí)別出九種巖相,不同巖相反映了特定的水深、地形和生物條件,其δ~(13)C值和δ~(18)O值也會(huì)有相應(yīng)的體現(xiàn)。一般情況下,古溫度T值增大,δ18 O值和古鹽度Z值減小,反映海平面上升;反之則指示海平面下降。研究表明,強(qiáng)迫型海退過(guò)程中的層序旋回為不對(duì)稱相序組構(gòu),從潮上帶至潮下帶其副層序結(jié)構(gòu)由復(fù)雜趨于簡(jiǎn)單,微層序的主要疊加方式也由1∶4向1∶2演變。因此,霧迷山組第4段層序旋回的相序組構(gòu)與典型的"霧迷山組旋回"差異巨大,這可能與華北古陸北緣中元古代的構(gòu)造演化轉(zhuǎn)折相關(guān)。
[Abstract]:Under the Wumishan formation in Yanliao area, the main body of the middle part belongs to the sequence cycle of the sea-advancing stage, characterized by the development of symmetrical facies fabric, but the upper part is characterized by a forced regression process, and the characteristics of the sequence cycle have not been studied in detail. For this reason, the authors selected the fourth member of Wumishan formation in Yongding River Zhuhuwa section of western Beijing to carry out systematic sedimentary microfacies, sedimentary facies sequence and sequence stratigraphy, chemical stratigraphy to restore sedimentary facies and divide sub-sequence types, and through carbon, The evolution of paleoenvironment was verified by oxygen isotopic composition and data analysis. Nine types of lithofacies were identified in Zhuanghuwa section. Different lithofacies reflect the specific water depth, topography and biological conditions, and their 未 ~ (13) C and 未 ~ (18) O values will also be reflected. In general, the T value of paleo temperature increases, the 未 18 O value and the paleosalinity Z value decrease, which reflects the rise of sea level, whereas it indicates that the sea level will fall. The study shows that the sequence cycles in the forced regression process are asymmetric sequence fabric, the secondary sequence structure of the subtidal zone from the upper tidal zone to the subtidal zone tends to be simple, and the main stacking mode of the microsequence evolves from 1:4 to 1:2. Therefore, the sequence fabric of the fourth member of the Wumishan formation differs greatly from the typical "Wumishan formation cycle", which may be related to the tectonic transition of the Middle Proterozoic in the northern margin of North China.
【作者單位】： 中國(guó)地質(zhì)大學(xué)(北京)地球科學(xué)與資源學(xué)院;中國(guó)地質(zhì)科學(xué)院;
【基金】：中國(guó)地質(zhì)科學(xué)院基本科研業(yè)務(wù)費(fèi)(編號(hào):YWF201608和YWF201609) 國(guó)家自然科學(xué)基金青年基金項(xiàng)目(編號(hào):41402004)資助的成果
【分類號(hào)】：P531;P542

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本文編號(hào)：2421020