發(fā)布時(shí)間：2018-05-01 15:31

  本文選題：灤平盆地 + 榆樹(shù)下剖面�。� 參考：《地學(xué)前緣》2017年01期

【摘要】：灤平盆地榆樹(shù)下剖面大北溝組出露完全、沉積連續(xù)、化石豐富,是研究熱河生物群的起源、早期演化以及中國(guó)陸相晚侏羅世—早白堊世過(guò)渡地層的關(guān)鍵層位。論文對(duì)人工新揭露出的榆樹(shù)下剖面進(jìn)行了精細(xì)的實(shí)測(cè);闡明了大北溝組與張家口組界線的標(biāo)志,為凝灰質(zhì)碎屑巖(沉積巖)的出現(xiàn)與晶屑巖屑熔凝灰?guī)r(火山巖)的結(jié)束;大店子組與大北溝組界線的標(biāo)志,為"蜂窩梁礫巖"或與之相當(dāng)?shù)拇炙樾紟r的出現(xiàn)。剖面的主體大北溝組總厚度為224.51m,可分為3段46層。大北溝組二段與一段界線的標(biāo)志,為正常沉積巖(不含或很少火山物質(zhì),開(kāi)始出現(xiàn)豐富化石)的出現(xiàn)并取代凝灰質(zhì)碎屑巖成為主要的巖層;大北溝組三段與二段界線的標(biāo)志清晰,為一套青灰色粉砂凝灰?guī)r的出現(xiàn)。依據(jù)新采集到的化石并結(jié)合前人資料,完成了榆樹(shù)下剖面大北溝組綜合生物地層的建立。首次在大北溝組二段中上部發(fā)現(xiàn)了介形類化石,并可延伸到三段頂部;初步鑒定出介形類化石9屬17種,可劃分為L(zhǎng)uanpingella-Pseudoparacypridopsis-Eoparacypris組合帶,并可進(jìn)一步細(xì)分為L(zhǎng)uanpingella postacuta和Pseudoparacypridopsis mountfieldensis 2個(gè)亞帶。葉肢介化石的首現(xiàn)面在二段底部,可貫穿至三段頂部;葉肢介組合帶的劃分參考前人的結(jié)果,由下至上分為Nestoria pissovi-Jibeilimnadia ovata、Nestoria pissovi-Keratestheria gigantea和Yanshania xishunjingensis-Y.subovata3個(gè)化石帶。昆蟲(chóng)化石主要分布在二段中部至三段中上部的頁(yè)巖中,僅為三尾擬蜉蝣(Ephemeropsis trisetaris)一個(gè)種,據(jù)此建立昆蟲(chóng)類Ephemeropsis trisetaris化石帶。此外,參考前人資料,嘗試建立了大北溝組孢粉、雙殼類和魚(yú)類化石帶。在大北溝組介形類、葉肢介、孢粉等生物的年代特征分析的基礎(chǔ)上,結(jié)合大北溝組同位素測(cè)年結(jié)果、磁性年代特征和生物歸屬的認(rèn)識(shí),將大北溝組的地質(zhì)時(shí)代歸為早白堊世。
[Abstract]:The Dabigou formation in Yushushi section of Luanping Basin is completely exposed, continuous sedimentary and rich in fossils. It is the key horizon to study the origin, early evolution and transitional strata of late Jurassic to early Cretaceous in China. In this paper, the detailed measurement of the newly exposed Yushu section is carried out, and the mark of the boundary between the Dabigou formation and the Zhangjiakou formation is clarified, which is the appearance of the tuff clastic rock (sedimentary rock) and the end of the crystalline clastic tuff (volcanic rock). The boundary between Damianzi formation and Dabeigou formation is marked by the occurrence of "honeycomb conglomerate" or equivalent coarse clastic rock. The total thickness of the Dabigou formation, the main body of the section, is 224.51 m, which can be divided into 3 sections and 46 layers. The boundary between the second member and the first member of the Dabigou formation is marked by the occurrence of normal sedimentary rocks (no or very little volcanic material and the appearance of rich fossils) and the replacement of tuffaceous clastic rocks as the main rock formations. The boundary between the third member and the second member of Dabigou formation is clear, which is a set of bluish gray silt tuff. Based on the newly collected fossils and previous data, the comprehensive biostratigraphy of the Dabigou formation in the Yushou section was established. For the first time, ostracods were found in the middle and upper part of the second member of the Dabigou formation, which can be extended to the top of the third member, and 9 genera and 17 species of ostracoda fossils were identified, which can be divided into Luanpingella-Pseudoparacypridopsis-Eoparacypris assemblage zone and further subdivided into Luanpingella postacuta and Pseudoparacypridopsis mountfieldensis subzones. The first present surface of the phyllodes is at the bottom of the second stage, which can run through the top of the third section, and the division of the lamellar assemblage zone can be divided into Nestoria pissovi-Jibeilimnadia ovata Nestoria pissovi-Keratestheria gigantea and Yanshania xishunjingensis-Y.subovata3 fossil belts from the bottom up according to the previous results. The insect fossils are mainly distributed in the shale from the middle part of the second member to the upper part of the third member, and are only a species of Ephemeropsis trisetaris (Ephemeropsis trisetaris). Based on this, the Ephemeropsis trisetaris fossil belt of insects has been established. In addition, the sporopollen, bivalve and fish fossils of the Dabigou formation have been established with reference to previous data. Based on the analysis of the age characteristics of ostracods, lobes, sporopollen and other organisms in the Dabigou formation, combined with the results of isotopic dating, magnetic chronology and biological attribution of the Dabigou formation, the geological age of the Dabigou formation is classified as early Cretaceous.
【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;北京盛元金土能源投資有限公司;
【基金】：國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃“973”項(xiàng)目(2012CB822000) 國(guó)家自然科學(xué)基金項(xiàng)目(41302008,41172015,41172037) 中國(guó)地質(zhì)大學(xué)(北京)優(yōu)秀導(dǎo)師基金項(xiàng)目(53200859507)
【分類號(hào)】：Q91;P534.5

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