吐哈盆地中二叠世古气候重建:来自木化石年轮的证据

发布时间：2018-01-02 04:16

本文关键词：吐哈盆地中二叠世古气候重建:来自木化石年轮的证据　出处：《地球科学》2016年10期 　论文类型：期刊论文

【摘要】：收集木化石年轮数据有助于古气候重建工作.首次通过对吐哈盆地北东缘中二叠统塔尔郎组中发现的木化石的年轮统计分析,还原了吐哈盆地中二叠世的古气候演化过程.木化石的年轮分析表明:该区中二叠世整体处于季节性明显的北亚热带,气候整体相对温暖,但出现过间歇性相对炎热的气候.木化石较低的晚材率以及部分年轮早材到晚材为过渡突变,反映树木生长时期季节性非常明显,夏季湿热,冬季干冷,为典型的亚热带季风型气候.木化石具较高的平均敏感度(MS平均可达0.4),显示树木生长期间受季风气候的影响,环境非常不稳定,每年大气降水量有很大的变化.连续年轮宽度的宽窄不一以及伪年轮的存在,表明当时气候变化频繁,整体较为湿润,但也具有干旱-半干旱的波动.
[Abstract]:The collection of chronological ring data of wood fossils is helpful to the reconstruction of paleoclimate. The first statistical analysis of the fossils found in the Middle Permian Talang formation in the northern eastern margin of Turpan-Hami Basin is carried out. The paleoclimate evolution of Middle Permian in Turpan-Hami Basin is reduced. The analysis of the annual ring of wood fossils shows that the whole Middle Permian period in this area is in the seasonal and obvious northern subtropics and the climate is relatively warm. But there was intermittent relatively hot climate. The low rate of late wood from wood fossils and the transition of some rings from early wood to late wood reflected that the seasonality of trees in growing period was very obvious, the summer was humid and hot, and the winter was dry and cold. As a typical subtropical monsoon climate, the average sensitivity of the wood fossils is up to 0.4, indicating that the trees are affected by the monsoon climate and the environment is very unstable during the growing period. The variation of the width of continuous ring and the existence of pseudo ring indicate that the climate change is frequent and the whole is humid, but it also has the fluctuation of arid and semi-arid.
【作者单位】：中国地质大学地球科学学院;江西省核工业地质局测试研究中心;
【基金】：中国地调局工作项目(No.1212011120966)
【分类号】：P532
【正文快照】： 吐鲁番-哈密盆地(简称吐哈盆地)是新疆3大含油气盆地之一,拥有丰富的油气资源及良好的勘探前景(袁明生,1998).吐哈盆地的二叠系有很好的烃源岩分布,主要集中在中二叠统,其次为下二叠统的上部(王昌桂和杨飚,2004).通过野外剖面、井下剖面对比,结合古生物资料及测年数据,刘延莉

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