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關(guān)于遼西北票組地質(zhì)時(shí)代及區(qū)域?qū)Ρ鹊脑儆懻?/H1>
發(fā)布時(shí)間:2018-07-15 19:38
【摘要】:北票組是遼西侏羅紀(jì)主要含煤地層,大部分學(xué)者從植物化石角度論述其時(shí)代為早侏羅世,區(qū)域上與窯坡組、永定莊組、富縣組、三工河組對比。本文從地層層序、巖性、構(gòu)造演化、古氣候演化等角度對北票組的地質(zhì)時(shí)代和區(qū)域?qū)Ρ冗M(jìn)行了討論,認(rèn)為該組為印支期后地殼伸展階段早侏羅世早—中期興隆溝組火山噴發(fā)之后和中侏羅世中晚期海房溝組、藍(lán)旗組燕山期火山活動之前的含煤盆地沉積產(chǎn)物。前者火山活動在冀北、京西形成南大嶺組,在北疆三工河組局部形成火山巖夾層;后者火山活動在冀北、京西形成九龍山組、髫髻山組,晉北形成云崗組、天池河組,北疆形成頭屯河組。北票組底部雜色地層化石稀少,有機(jī)質(zhì)含量低,氣候應(yīng)相對干熱,北票組(雜色地層以上部分)、海房溝組、藍(lán)旗組植物化石和孢粉證明古氣候由溫濕向干熱逐漸演化,而該特征和中國北方以至全球早侏羅世晚期干熱、中侏羅世從早期到晚期由溫濕向干熱的演化規(guī)律—致。從而,北票組底部雜色地層屬于早侏羅世晚期并和三工河組、富縣組、永定莊組、陽眷組、窯坡組底部對比;北票組雜色地層以上部分屬于中侏羅世早期,與西山窯組、延安組、大同組、下花園組、窯坡組(K1砂巖以上部分)對比。
[Abstract]:Beipiao formation is the main coal-bearing strata of Jurassic in western Liaoning. Most scholars discuss its age as early Jurassic from the point of view of plant fossils, which is compared with Yaopo formation, Yongding Zhuang formation, Fuxian formation and Sangonghe formation. This paper discusses the geological age and regional correlation of Beipiao formation from stratigraphic sequence, lithology, tectonic evolution and paleoclimate evolution. It is considered that the formation is the product of coal-bearing basins before the volcanic activity of Yanshanian period in the early Jurassic early and middle Jurassic Xinglonggou formation and the middle and late Middle Jurassic Haifanggou formation and the Lanqi formation before the Yanshanian volcanic activity in the post-Indosinian crustal extension stage. The former is formed in the north of Hebei Province, the Nandaling formation in the west of Beijing, and the volcanic rock intercalation in the Sangonghe formation in the northern Xinjiang, while the latter is formed in the north of Hebei Province, the Jiulongshan formation, the Tiaojishan formation, the Yungang formation and the Tianchihe formation in the northern part of Shanxi Province. The formation of Toutunhe formation in northern Xinjiang. At the bottom of the Beipiao formation, the fossils are rare, the organic matter content is low, and the climate should be relatively dry and hot. The fossil plants and sporopollen of the Beipiao formation, Haifanggou formation and Lanqi formation prove that the paleoclimate evolves from temperature and humidity to dry heat. These characteristics are related to the evolution of dry heat from the early Jurassic to the dry heat from the early to the late Middle Jurassic and from the temperature and humidity to the dry heat in the middle Jurassic. Thus, the bottom heterochromatic strata of the Beipiao formation belong to the bottom correlation of the late early Jurassic and Sangonghe formation, Fuxian formation, Yongdingzhuang formation, Yangjiai formation and Yaopo formation, and the upper part of the beipiao formation belongs to the early Middle Jurassic period, and to the Xishanyao formation, Yan'an formation, Datong formation, Xiayuan formation and Yaopo formation (above K 1 sandstone) are compared.
【作者單位】: 河北省煤田地質(zhì)局;河北省煤田地質(zhì)勘查院;河北省煤田地質(zhì)局第四地質(zhì)隊(duì);
【基金】:河北省礦產(chǎn)資源潛力評價(jià)項(xiàng)目(編號:121201813003)的成果~~
【分類號】:P535

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