新疆石油地质

新疆石油地质 ›› 2004, Vol. 25 ›› Issue (4): 365-367.

• 油气勘探 • 上一篇    下一篇

济阳坳陷中、新生代岩石圈的稀土元素反演

章大港1, 史卜庆2, 周瑶琪1   

  1. 1.石油大学地球化学与岩石圈动力学开放实验室,山东东营257061;
    2.中国石油石油勘探开发科学研究院,北京100083
  • 收稿日期:2004-01-09 修回日期:2004-04-12 发布日期:2021-01-06
  • 作者简介:章大港(1974-).男,浙江富阳人,讲师,博士,石油地质,联系电话:0546-8390686
  • 基金资助:
    国家973顶目(C199043302)和教育部肯年骨干教师基金(K000110A)共同资助

Inversion of Rare Earth Element (REE) in the Lithosphere in Jiyang Depression

ZHANG Da-gang1, SHI Bu-qing2, ZHOU Yao-qi1   

  1. 1. Laboratory of Geochemistry & Lithosphere Dynamics, Universily of Petroleum, Dongying, Shandong 2570611, China;
    2. Rescarch lnstitute of Petroleum Exploration and Development, PetroChina, Beijing, 100083, China
  • Received:2004-01-09 Revised:2004-04-12 Published:2021-01-06

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摘要： 利用基于经典地幔岩无水熔融理论基础 上的稀土元素(REE)反演方法,讨论了渤海湾盆地济阳坳陷中新生代岩石圈动力学过程。火山岩稀土元素反演结果表明,地幔异常高温显然与大陆地幔热柱活动有关。地幔热柱上升的过程从中生代末开始一直持续到新生代孔店期,新近纪地幔热柱才下降。结合盆地构造沉降情况,利用经验公式计算了岩石圈的厚度,认为计算出来的岩浆源深度基本上代表了软流圈顶面深度,由于软流圈的上涌将导致岩石圈的减薄,因此,在中、新生代交界处及沙四段末的济阳运动之前岩石圈厚度是减薄的,在济阳运动与东营运动之间的Es3-Es2-1时期岩石圈厚度也是减薄的,从Eg期至今,岩石圈厚度总体上也是减薄的。

关键词: 济阳坳陷, 中生代, 新生代, 地幔, 稀土元素, 反演

Abstract: This paper presents a discusion of t.he dynamic process of Mz-Cz lithosphere in Jiyang depression of Bohai Bay basin by llsing REE inversion method based on classical theory of water-free melting mantle rock. The result shows abnormal high temperature of mantle is closely related to activity of continental mantle thermal plume that ascends since late Mz till Cz (Ek) and descends since N. Also, it is proved by calcu-lated magma original depth representing the depth of Lop of asthenosphere tlhat the upwelling of asthenosphere takes place with the thinning of lithosphere, hence, tbe thickness of lithosphere in Mz-Cz interface and before Jiyang movement (Es3) assumes thinning trend, So do the litho-sphere thickness during Es3 to Dongying movement (ES3) and the overall lithosphere thickness since Eg to present.

Key words: Jiyang depression, Mesozoie, Cenozoic, mantle, rare earth element (REE), inversion

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