羌塘地块中生代时期的漂移演化及其成钾条件
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The Mesozoic Evolution History of the Qiangtang Block and Its Potential in Potash Formation
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    摘要:

    通过研究地块的古纬度,可以为我们认识该地块在地质历史时期的古地理位置和南北向漂移演化提供定量约束。本文通过收集、整理、评判中生代时期羌塘地块已发表的古地磁数据,建立了该地块在中生代时期的漂移演化历史。羌塘地块在中—晚三叠世期间,可能发生大规模快速北向漂移,并与羌塘北部的构造单元体发生碰撞;中侏罗世时期位于北半球214°N,晚侏罗世期间已北向到达318°N。中晚侏罗纪期间,羌塘地块古纬度值逐步升高,发生约1154±223km(△λ=104°±21°)的北向漂移。白垩世期间羌塘地块相对稳定,在古纬度30°N左右。综合上述羌塘地块的漂移演化历史,结合其它地质证据,如古气候、构造和从古地理位置等,中晚侏罗世夏里组时期羌塘地块具备较好的成钾条件。

    Abstract:

    Palaeolatitude study can provide quantitative constraints in paleogeographic reconstruction for latitudinal drift of the block during the geological time. This study reappraised the Mesozoic evolution history of the Qiangtang Block, through reevaluating the published paleomagnetic data. The results show that the Qiangtang Block has been in the northern hemisphere subtropical high pressure zone during the Middle to Late Triassic, and collided with its northern tectonic unit. It reached a latitude of 214°N in the Middle Jurassic, with continuous northward drift to 318°N in the Late Jurassic. The magnitude of this drift reached 1154±223km(△λ=10.4°±2.1°)during the Jurassic period. The block had kept a relatively stable paleolatitude during Cretaceous. Combined this tectonic drift history with other geological evidences, such as paleoclimate, tectonic and paleogeography evidences, we believe that the period of the Xiali Formation in the Middle Late Jurassic has had high potential in potash formation.

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任海东,颜茂都,陈毅,张大文,栗兵帅.2015.羌塘地块中生代时期的漂移演化及其成钾条件[J].地质学报,89(11):2005-2018.
REN Haidong, YAN Maodu, CHEN Yi, ZHANG Dawen, LI Bingshuai.2015. The Mesozoic Evolution History of the Qiangtang Block and Its Potential in Potash Formation[J]. Acta Geologica Sinica,89(11):2005-2018.

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  • 在线发布日期: 2015-11-02
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