發(fā)布時(shí)間：2018-06-12 06:13

  本文選題：山東諸城 + 王氏群��； 參考：《地質(zhì)論評(píng)》2016年02期

【摘要】：山東東部諸城晚白堊世王氏群大面積、高密度集群埋藏的恐龍化石是近年研究的熱點(diǎn),但其沉積物源與精確沉積時(shí)限目前尚不明確。本文通過對(duì)山東諸城王氏群恐龍化石層中6個(gè)砂巖樣品的碎屑鋯石U-Pb定年表明,樣品090414-24-D中最年輕的單顆粒鋯石年齡(YSG)為77.3 Ma,應(yīng)代表王氏群恐龍化石層的最大沉積時(shí)限(下限),結(jié)合前人對(duì)王氏群紅土崖組的年代學(xué)研究表明,其沉積時(shí)限應(yīng)老于73.5 Ma(上限),也說明賦存恐龍化石層的王氏群上部紅土崖組為Campanian期沉積;碎屑鋯石定年揭示物源的鋯石年齡組成分布在100～130 Ma之間,6個(gè)樣品的年齡主峰值多在110 Ma或120 Ma左右,與下伏的早白堊世青山群火山巖年齡主峰較為吻合。王氏群恐龍化石層礫巖的礫石成分和古水流研究顯示,其中3組礫石統(tǒng)計(jì)表明礫巖層礫石成分主要由火山巖或火山碎屑巖組成,3組古水流數(shù)據(jù)表明,諸城地區(qū)王氏群紅土崖組礫巖層的古流向以南和南東方向?yàn)橹?尚有1組顯示古流向?yàn)橄虮?表明王氏群物源主要來自盆地北側(cè)萊陽和北西側(cè)沂沭斷裂帶的青山群火山巖,其次為盆地南緣。本研究為諸城王氏群化石層沉積時(shí)限的限定和沉積物源的判斷,以及膠萊盆地王氏群時(shí)期古地理格局的恢復(fù)等提供了重要的依據(jù)。
[Abstract]:The dinosaur fossils buried in the late Cretaceous Wangshi group in Zhucheng, eastern Shandong Province, have been a hot research topic in recent years, but its sediment source and precise sedimentary time limit are still unclear. In this paper, the zircon U-Pb dating of 6 sandstone samples from the dinosaur fossils of the Wangshi Group in Zhucheng, Shandong Province has been studied. The youngest single grain zircon age of sample 090414-24-D is 77.3 Ma, which represents the maximum sedimentary time limit (lower limit) of the dinosaur fossils of the Wang's group, and combined with previous chronological studies of the red earth cliff formation of the Wang's group. The sedimentary time limit should be longer than 73.5 Ma (upper limit), which also indicates that the upper part of the Wangshi Group is Campanian sedimentary. The dating of detrital zircon reveals that the zircon age composition of the provenance is between 100 and 130 Ma, and the main peak age of 6 samples is about 110 Ma or 120 Ma, which is consistent with the main age peak of the lower Cretaceous volcanic rocks in Qingshan Group, early Cretaceous. The study of gravel composition and paleocurrent of dinosaur fossil bed conglomerate in Wangshi group shows that three groups of gravel statistics show that the gravel composition of conglomerate bed mainly consists of volcanic rock or pyroclastic rock. In Zhucheng area, the conglomerate of the Hongtuya formation of the Wangshi group mainly flows south and south to the east, and one group shows that the paleodirection is northward, indicating that the provenance of the Wangshi group mainly comes from the volcanic rocks of the Qingshan group in the Laiyang and Yushu fault zones on the north side of the basin. The next is the southern margin of the basin. This study provides an important basis for the determination of the sedimentary time limit and source of the fossil beds of the Wangshi Group in Zhucheng Basin and the restoration of the paleogeographic pattern of the Wangshi Group in the Jiaolai Basin.
【作者單位】： 中國地質(zhì)科學(xué)院地質(zhì)研究所;山東省地質(zhì)調(diào)查研究院;中國地質(zhì)大學(xué)(北京)地球科學(xué)與資源學(xué)院;諸城市恐龍文化研究中心;
【基金】：國家自然科學(xué)基金項(xiàng)目(編號(hào):41272021、41372109、90914003) 中國地質(zhì)調(diào)查局項(xiàng)目(編號(hào):1212011085477、12120114064301)聯(lián)合資助的的成果~~
【分類號(hào)】：P597.3;Q915.2

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本文編號(hào)：2008662