期刊文献+

浙闽地区白垩纪早中期黏土矿物组成特征及其古气候显示 被引量:9

The Early-Mid Cretaceous Changes of Clay Mineral Composition from Zhejiang and Fujian Provinces,SE China:Indications to paleoclimate changes
下载PDF
导出
摘要 对浙江西南和福建西部地区11个剖面点陆相白垩系11个层位的碎屑黏土矿物组成进行了测试分析。结果显示,白垩系中下部大部分层位以伊利石为主,相对含量平均超过80%;闽西坂头组、浙西寿昌组顶部—横山组下部、金华组中部、衢县组上部出现了较为丰富的蒙脱石,最高达49%;高岭石一般较少,仅在浙西衢县组中部、寿昌组上部较高,最高达38%。研究表明,中国东南地区在白垩纪早中期主要属于热带—亚热带干旱—半干旱气候,与全国乃至全球温室气候一致;在浙西阿普特初期和赛诺曼早期间断有湿热气候,可能与区域古植物较为繁盛及较大面积湖区有关;闽西凡兰吟期,浙西阿普特早期、阿尔布晚期、赛诺曼中期部分时期存在短期相对干冷气候,大致分别对应于白垩纪全球大洋缺氧事件结束后的一段时间,并可能与区域隆升有关。 Components of the clay mineral illite,smectite,kaolinite,and chlorite were measured and analyzed at eleven horizons from eleven observed sections to interpret the Early-Mid Cretaceous paleoclimate in western Zhejiang and Fujian provinces,SE China.The results show that in total the relative content of illite is over 80% in average in most of the Lower-Mid Cretaceous;abundant smectite is presented in the Bantou Formation of western Fujian and the upper Shouchang Formation,lower Hengshan Formation,middle Jinhua Formation,and upper Quxian Formation of west Zhejiang,in which the highest value is 49%;kaolinite is few,only high values(up to 38%) ocurring in the middle Quxian Formation in western Zhejiang and upper Shouchang Formation.It is proposed that it was arid-semiarid climate of tropic-subtropic in the Early-Mid Cretaceous in SE China,corresponded to the whole greenhouse(continental) climate in the world;there could be an interruption of hot-humid climate in the early-Aptian and early Cenomanian in western Zhejiang that could be attributed to relatively developed vegetation and larger lacustrine area;and short durations of dry-cold climate could have happened in the Valanginian in western Fujian and in the early Aptian,late Albian,middle Cenomanian in western Zhejiang,which is corresponding to those of the Cretaceous oceanic anoxic events,and is supposed to be caused by regional tectonic uplifts in SE China.
出处 《沉积学报》 CAS CSCD 北大核心 2012年第1期120-127,共8页 Acta Sedimentologica Sinica
基金 国家重大基础研究发展规划项目(973)"晚中生代温室气候-气候演变"之课题"晚中生代东西地区古气候重建"(2006CB701401)资助成果
关键词 黏土矿物 古气候 白垩纪 浙江 福建 clay mineral paleoclimate Cretaceous Zhejiang Fujian
  • 相关文献

参考文献47

二级参考文献530

共引文献1023

同被引文献230

引证文献9

二级引证文献39

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部