Palaeoclimatic evolution during Eocene and its influence on oil shale mineralisation, Fushun basin, China
Palaeoclimatic evolution during Eocene and its influence on oil shale mineralisation, Fushun basin, China
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DOI：
10.1016/j.jseaes.2011.09.021
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发表时间：
2012-02-02
影响因子：
3
通讯作者：
Hu, Fei
中科院分区：
文献类型：
--
作者：
Meng, Qingtao;Liu, Zhaojun;Hu, Fei
抚顺盆地是位于中国东北部辽宁省的一个小型、已勘探的含煤含油页岩新生代断陷盆地。该盆地以始新世古城子-西鲁田组沼泽-湖相沉积为主，蕴藏着亚洲最大的露天油页岩矿床。利用野外地质观察、粘土矿物学和地球化学(锶/钡、锶/铜、稳定碳和0同位素)分析等多种方法对93个样品进行了分析，并与古植物学资料进行了对比，为盆地古气候重建提供了理想的机会。抚顺盆地始新世气候由暖温带向北亚热带演化，总体由暖湿向亚湿润-半干旱转变。古气候和地球化学参数表明，集军屯组温暖湿润的气候提高了湖水的初始生产力，导致湖水稳定层化，进而造成水底缺氧。湖泊的生产力为油页岩的形成提供了有机质的平均来源，稳定的缺氧环境有利于有机质的保存。(C)2011爱思唯尔有限公司。保留所有权利。
The Fushun basin is a small, explored, coal and oil shale-bearing, Cenozoic fault basin in the Liaoning Province, northeast China. The basin mainly consists of Eocene swamp to lacustrine deposits of the Guchengzi to Xilutian Formation, and contains the biggest opencast oil shale mine in Asia. This mine has provided an ideal opportunity to undertake palaeoclimate reconstruction in this basin based on a single geological profile and the analyses of 93 samples, using various approaches, namely field geological observation, clay mineralogical and geochemical (Sr/Ba, Sr/Cu, stable C and 0 isotope) analyses, all of which were compared with palaeobotanical data. The Eocene climate of Fushun basin evolved from warm temperate to north subtropical, and generally changed from warm humid to subhumid-semiarid. Paleoclimatic and geochemical parameters shows that the very warm and humid climate during Jijuntun Formation increased the initial productivity of lake water, and caused a steady stratification of the lake water, then caused oxygen lack in the bottom of water. Productivity of the lake provides the mean origin of organic matters for oil shale formation, and steady anoxic environment is beneficial for the conservation of organic matters. (C) 2011 Elsevier Ltd. All rights reserved.