中国侏罗纪古气候分区与演变

发布时间：2018-04-24 01:25

本文选题：侏罗纪 + 气候分区　；参考：《地学前缘》2017年01期

【摘要】：以古生物学和沉积学资料为主,结合地球化学和植物化石气孔器参数等资料系统分析了中国侏罗纪的气候特征、气候分区及其演变过程。侏罗纪时期的气温明显比现代为高,但无论是温度还是湿度都经历了强烈的变化,可划分为早侏罗世早中期、晚期,中侏罗世早、晚期以及晚侏罗世等5个演化阶段,各阶段气候分区特征明显。其中,早侏罗世早中期(大致为埃唐日期—普林斯巴赫期)可划分为5个气候区,自北而南依次为黑龙江东部乌苏里温凉气候区、北方暖温带潮湿气候区、东南热带-亚热带潮湿气候区、西南热带-亚热带半干旱半潮湿气候区以及西藏—滇西热带海洋干旱气候区。其中,北方暖温带潮湿气候区范围最大,占据了昆仑—秦岭—大别山一线以北的广大地区。早侏罗世晚期(图阿尔期)总体升温并趋于干旱化,依然可以划分为5个气候区,但北方暖温带潮湿气候区由于南界的大幅度向北移而大为缩小,范围最广的是中部热带-亚热带半干旱-半潮湿气候区。中侏罗世早期(阿伦期—巴柔期)气温较早侏罗世晚期明显下降,北方暖温带潮湿气候区南界向南推移,基本恢复到了早侏罗世早中期的范围,东南地区为热带-亚热带半干旱-半潮湿气候。中侏罗世晚期(巴通期—卡洛维期)又复升温趋干,气候区界线再度北移,暖温带潮湿气候区范围再次大幅度缩小到燕辽及东北地区,热带-亚热带半潮湿-半干旱气候区范围扩大至整个华北与西北地区,南方则为热带-亚热带干旱气候区。晚侏罗世气温进一步升高,暖温带潮湿气候区退缩至东北一隅,除滇、藏热带海洋干旱气候区外,其他广大地区均为热带-亚热带干旱气候,且多地出现荒漠化。
[Abstract]:Based on paleobiology and sedimentology data, the climatic characteristics, climatic zoning and evolution of Jurassic in China were systematically analyzed by combining geochemistry and plant fossil stomatal apparatus parameters. The temperature of the Jurassic period is obviously higher than that of the modern period, but both the temperature and the humidity have undergone strong changes, which can be divided into five evolution stages: the early middle Jurassic, the late Jurassic, the middle Jurassic early, the late Jurassic and the late Jurassic. The climatic zoning characteristics of each stage are obvious. Among them, the early and middle Jurassic (about the Etang date to Plinsbach period) can be divided into five climatic regions, from north to south are the east of Heilongjiang Wusuli temperate climate zone, the northern warm temperate zone humid climate area, The southeastern tropic-subtropical humid climate zone, the southwest tropical subtropical semi-arid and semi-humid climate zone and the Xizang-western Yunnan tropical arid marine climate zone. Among them, the warm temperate zone in the north has the largest range, occupying the vast area north of Kunlun-Qinling-Dabie Mountains. In the late early Jurassic (Tuar period), the temperature increased and tended to drought, and it can still be divided into 5 climatic regions. However, the warm and humid climate in the northern warm temperate zone is greatly reduced by the large northward movement of the southern boundary. The most extensive is the central tropical-subtropical semi-arid-semi-humid climate zone. The temperature of the early Middle Jurassic (Arlen-Barrou period) was obviously lower than that of the late Jurassic, and the southern boundary of the warm temperate humid climate zone in the north moved southward, and basically recovered to the range of the early and middle Jurassic. Southeast for the tropical-sub-tropical semi-arid-semi-humid climate. In the late Middle Jurassic period (Baton-Carlowe period), the climatic zone was drier again, the boundary of climate zone moved northward again, and the range of warm temperate humid climate region was reduced to Yanliao and northeast area again. The range of tropical-subtropical semi-humid-semi-arid climate zone is extended to the whole North and Northwest China and the south is the tropical-subtropical arid climate zone. The temperature of the late Jurassic increased further, and the humid climate of warm temperate zone retreated to a corner of northeast China. Except Yunnan and Tibetan tropical marine arid climate regions, all the other regions were tropical to subtropical arid climate, and desertification occurred in many places.
【作者单位】：中国石油天然气股份有限公司勘探开发研究院;提高石油采收率国家重点实验室;中国石油天然气集团公司油气储层重点实验室;中国地质大学(北京);中国科学院南京地质古生物研究所;兰州大学;
【基金】：国家重点基础研究发展计划“973”项目(2012CB822003) 国家自然科学基金项目(40372021) 国际地质联合会全球对比计划项目(IGCP632)
【分类号】：P532

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