| 辽西金羊盆地北票组孢粉组合及其时代和古气候意义 |
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| 引用本文： | 刘淼,张渝金,孙守亮,陈井胜,李斌,杨帆,张涛,汪岩,吴振.辽西金羊盆地北票组孢粉组合及其时代和古气候意义[J].地球科学,2019,44(10):3393-3408. |
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| 作者姓名： | 刘淼 张渝金 孙守亮 陈井胜 李斌 杨帆 张涛 汪岩 吴振 |
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| 作者单位： | 中国地质调查局沈阳地质调查中心, 辽宁沈阳 110034 |
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| 基金项目： | 中国地质调查局地质调查项目DD20160201-05中国地质调查局地质调查项目12120114055501中国地质调查局地质调查项目DD20190042-04国家自然科学青年基金项目41702032中国地质调查局地质调查项目12120113053400 |
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| 摘 要： | 金羊盆地内的北票组是辽西地区重要的含煤及生烃潜力层，确定其时代和古气候环境对进一步研究北票组有非常重要的意义.在坤头营子地区北票组剖面中采集到20件孢粉样品进行孢粉学研究，并对侵入北票组的花岗斑岩及该组地层下部的兴隆沟组安山岩进行了锆石U-Pb同位素测年.系统的分析、鉴定和研究表明:北票组自下而上可划分为3个孢粉组合，下部以Monosulcites-Chasmatosporites-Polycingulatisporites为代表，中部以Protopinus-Paleoconiferus-Alisporites为代表，上部以Monosulcites-Protopinus-Paleoconiferus为代表.锆石U-Pb同位素测年结果分别为172.6 Ma和189 Ma.最终确定北票组的形成时代为早侏罗世中、晚期，自下而上反映了从半湿润的北亚热带气候向湿润的温带气候转变的特征.
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| 关 键 词： | 北票组 孢粉组合 古气候 早侏罗世 金羊盆地 生物地层学 |
| 收稿时间： | 2019-06-21 |
Palynological Assemblages of Beipiao Formation in Jinyang Basin of West Liaoning,and Their Age and Paleoclimatic Significances |
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| Abstract: | The Beipiao Formation within the Jinyang basin at West Liaoning is an important coal-bearing and hydrocarbongenerating potential bed, the determination of its formation age and paleoclimatic environment is very important for its research. At present study, 20 palynological samples were collected from the section of Beipiao Formation at Kuntouyingzi area, and the zircon U-Pb ages of granite porphyry which intruded in the Beipiao Formation and andesite that from the lower strata of Xinglonggou Formation were analyzed. 3 sporo-pollen assemblages which represented by Monosulcites-Chasmatosporites-Polycingulatisporites of lower part, Protopinus-Paleoconiferus-Alisporites of middle part and Monosulcites-Protopinus-Paleoconiferus of upper part were identified from Beipiao Formation after systematical analysis, identification and research. The U-Pb dating results of zircon are 172.6 Ma and 189 Ma, respectively. The formation age of Beipiao Formation is determined as middle and late Early Jurassic and the bottom-up reflects the characteristics of the transition from a subhumid north subtropical climate to a humid temperate climate. |
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