膠萊盆地白堊系林寺山組礫巖沉積特征及盆地演化意義
本文選題:膠萊盆地 切入點(diǎn):白堊系 出處:《沉積學(xué)報(bào)》2016年01期 論文類型:期刊論文
【摘要】:膠萊盆地下白堊統(tǒng)萊陽群底部林寺山組主要由礫巖組成。通過對(duì)盆地及周緣18個(gè)地點(diǎn)林寺山組礫巖系統(tǒng)的調(diào)查,從礫巖組分、礫徑和長軸排列方向的統(tǒng)計(jì)分析出發(fā),研究該礫巖沉積相類型、盆地物源區(qū)、古水流及林寺山組上覆地層中砂巖碎屑鋯石U-Pb年齡譜特點(diǎn),并進(jìn)一步討論了盆地演化的意義。研究表明,林寺山組底部礫巖以沖積扇相為主,但不同地點(diǎn)亞、微相類型又有差異。原型膠萊盆地由萊陽、海陽—即墨和諸城—五蓮3個(gè)獨(dú)立盆地組成,被6個(gè)隆起區(qū)所分隔。萊陽盆地的物源主要來自膠北隆起和蘇魯造山帶北部;海陽—即墨盆地以蘇魯造山帶北部隆起區(qū)、即墨—牟平隆起、膠南隆起為主物源區(qū);諸城—五蓮盆地以膠南隆起和馬山—李黨家低隆起為主要物源區(qū)。林寺山組礫巖的出現(xiàn)標(biāo)志著蘇魯造山帶大規(guī)模塌陷和膠萊盆地的形成。
[Abstract]:The Linsishan formation at the bottom of the Lower Cretaceous Laiyang Group in Jiaolai Basin is mainly composed of conglomerates. Based on the investigation of the conglomerate system of the Linsishan formation in 18 locations of the basin and its periphery, the statistical analysis of the conglomerate composition, gravel diameter and the direction of the long axis arrangement is carried out. The sedimentary facies type of the conglomerate, the source area of the basin, the paleocurrent and the U-Pb age spectrum of sandstone zircon in the overlying strata of the Linshishan formation are studied, and the significance of the basin evolution is discussed. The bottom conglomerate of Linsishan formation is mainly alluvial fan facies, but the microfacies types are different in different locations. The prototype Jialai basin is composed of three independent basins: Laiyang, Haiyang-Jimo and Zhucheng Wulian. The provenance of the Laiyang basin is mainly from the northern Jiaobei uplift and the northern Sulu orogenic belt, and the Haiyang-Jimo basin is dominated by the northern uplift of the Sulu orogenic belt, the Jimo-Muping uplift, and the main provenance of the Jiaonan uplift. In Zhucheng-Wulian basin, Jiaonan uplift and Mashan-Lidujia low uplift are the main source areas. The occurrence of conglomerate in Linsishan formation marks the large-scale collapse of Sulu orogenic belt and the formation of Jiaolai basin.
【作者單位】: 中國地質(zhì)科學(xué)院地質(zhì)研究所;中國地質(zhì)大學(xué)(北京)地球科學(xué)與資源學(xué)院;中國海洋石油總公司湛江分公司;
【基金】:國家自然基金項(xiàng)目(41272021;41372109;90914003) 中國地質(zhì)調(diào)查局項(xiàng)目(1212011085477;12120114064301)~~
【分類號(hào)】:P534.53
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