燕山地区早侏罗世岩浆活动热供给的数值模拟

地震 ›› 2013, Vol. 33 ›› Issue (4): 257-268.

燕山地区早侏罗世岩浆活动热供给的数值模拟

刘翠^1,2, 石耀霖², 乔彦超², 邓晋福¹, 李宁¹, 段培新¹

1.中国地质大学, 北京 100083;
2.中国科学院计算地球动力学重点实验室, 北京 100049

收稿日期:2013-02-18 修回日期:2013-05-28 发布日期:2020-09-27
作者简介:刘翠(1973-), 女, 山东邹城人, 博士, 主要从事岩浆岩及岩浆数值模拟等研究。
基金资助:
国家自然科学基金青年基金项目(NSFC40802020)、华北克拉通破坏专项(NSFC41204066)和中国地质调查局项目(1212011121075; 1212010911028)及国家留学基金委资助

Numeric Simulation of Early Jurassic Magma-heating Supply in the Yanshan Area

LIU Cui^1,2, SHI Yao-lin², QIAO Yan-chao², DENG Jin-fu¹, LI Ning¹, DUAN Pei-xin¹

1. China University of Geosciences, Beijing 100083, China;
2. Laboratory of Computational Geodynamics, CAS, Beijing 100049, China

Received:2013-02-18 Revised:2013-05-28 Published:2020-09-27

摘要/Abstract

摘要： 燕山地区燕山期发育大量的岩浆岩, 如此大规模的岩浆活动(热)的来源一直是一个谜。本文利用有限元的热传导模拟反演可能的热供给。模型假设温度1250 ℃、面积905.86 km²半圆面形玄武岩浆底侵到36.6~50 km深的陆壳底部, 陆壳的地温梯度随着克拉通的破坏而逐渐升高。数值模拟的主要结论: ① 早侏罗世时期的地温曲线表明, 要使围岩发生熔融, 所需要的底侵玄武岩岩浆量是非常大的, 基于燕山地区实际产出的早侏罗世时期的酸性岩, 反演产生81 km²的花岗岩需要的最少底侵玄武岩岩浆量为1053 km²; ② 早侏罗世(J₁)的模型温度场表明, 随着时间的演化, 在40～50 km处水平方向的围岩温度升高明显, 形成很明显的一条高温带或熔融带, 该高温带或者熔融带可能成为后期的构造薄弱面, 加上榴辉岩相变造成的密度增加引起下坠, 达到临界值时, 就会出现垮落, 因此本文从数值模拟的角度, 支持拆沉作用的发生。

关键词: 岩浆活动, 早侏罗世, 拆沉, 数值模拟, 燕山地区

Abstract: Massive Yanshanian magmatic rocks were developed in the Yanshan area of North China. These large-scale magmatic rocks were formed in a short time. However, the heat source of these massive magmatic activities remains unknown. This paper attempts to invert the source of magma with the heat conduct problem by finite element simulation. It is hypothesized that a piece of round-shaped basaltic magma of 905.86 km², underplated into deep crust between 36.6 km and 50 km at the temperature of 1250℃, the geothermal gradient of the crust rose gradually with the evolution of North China craton. The main conclusions of this numerical simulation are as follows: (1) The geothermal temperature curves of J1 reveal that, to make the wall rock melt, the volume of underplating basaltic magma should be considerably huge. Based on the actual output of the acid rock during J1 period in Yanshan area, the amount of underplating basaltic magma required by inversion is 1053 km² to produce 86 km² granites (J1). (2) The temperature field of J1 model shows, the temperature of wall rock at the level of 40~50 km in the horizontal direction was increased significantly and formed a high-temperature zone or melting zone which might be the later tectonic weak surface. And when it transformed into eclogite facies, the density would be greatly increased. The high-density residue fell until caving occurred, as it reached a critical value. This paper supports the occurrence of delamination from the perspective of numerical simulation.

Key words: Magma-heating Supply, Early Jurassic (J1), Delamination, Numerical Simulation, Yanshan Area

中图分类号:

P315

刘翠, 石耀霖, 乔彦超, 邓晋福, 李宁, 段培新. 燕山地区早侏罗世岩浆活动热供给的数值模拟[J]. 地震, 2013, 33(4): 257-268.

LIU Cui, SHI Yao-lin, QIAO Yan-chao, DENG Jin-fu, LI Ning, DUAN Pei-xin. Numeric Simulation of Early Jurassic Magma-heating Supply in the Yanshan Area[J]. EARTHQUAKE, 2013, 33(4): 257-268.

参考文献

[1] 邓晋福, 苏尚国, 刘翠, 等. 关于华北克拉通燕山期岩石圈减薄的机制与过程的讨论: 拆沉？还是热侵蚀和化学交代[J]. 地学前缘, 2006, 13(2): 105-119.
[2] Martin Menzies, Yigang Xu, Hongfu Zhang, et al. Integration of geology, geophysics and geochemistry: A key to understanding the North China Craton[J]. Lithos, 2007, 96: 1-21.
[3] 徐义刚. 用玄武岩组成反演化中-新生代华北岩石圈的演化[J]. 地学前缘, 2006, 13(2): 93-100.
[4] Wu F Y, Walker R J, Yang Y H,et al. The chemical temperoal evolution of lithospheric mantle underlying the North China Craton[J]. Geochim, Cosmochim, Acta, 2006, 70: 5013-5034.
[5] 吴福元, 徐义刚, 高山, 等. 华北岩石圈减薄与克拉通破坏研究的主要学术争论[J]. 岩石学报, 2008, 24(6): 1145-1174.
[6] 郑建平, 路凤香, Griffin W L, 等. 华北东部橄榄岩与岩石圈减薄中的地幔伸展和侵蚀置换作用[J]. 地学前缘, 2006, (13): 76-85.
[7] Xu Y G, Huang X L, Ma J L, et al. Crust mantle interaction during the tectono thermal reactivation of the North China Craton: constraints from SHRIMP zircon U-Pb chronology and geochemistry of Mesozoic plutons from western Shandong[J]. Contrib, Mineral, Petrol, 2004, 147: 750-767.
[8] Meijian An, Yaolin Shi. Lithospheric thickness of the Chinese continent[J]. Physics of the Earth and Planetary Interiors, 2006, 159: 257-266.
[9] SHI Yaolin, CAO Jianling. Lithosphere Effective Viscosity of Continental China[J]. Earth Science Frontiers, 2008, 15(3): 82-95.
[10] 石耀霖, 张健. 活动海岭俯冲与岛弧火山活动的热模拟研究[J]. 地球物理学报, 1998, 41(2): 174-181.
[11] Wei Wei, Jiandong Xu, Dapeng Zhao, et al. East Asia mantle tomography: New insight into plate subduction and intraplate volcanism[J]. Journal of Asian Earth Sciences, 2012, 60: 88-103.
[12] Yujun Sun, Shuwen Dong, Huai Zhang, et al. 3D thermal structure of the continental lithosphere beneath China and adjacent regions[J]. Journal of Asian Earth Sciences, 2013, 62: 697-704.
[13] 刘翠, 邓晋福, 苏尚国, 等. 华北地区燕山期岩浆活动热供给的初步数值模拟[J]. 地学前缘, 2006, 13(2): 158-164.
[14] 邓晋福, 赵海玲, 莫宣学, 等. 中国大陆根-柱构造大陆动力学的钥匙[M]. 北京: 地质出版社, 1996. 1-110.
[15] Gao S, Rudnick R L, Yuan H L, et al. Recycling lower continental crust in the North China craton[J]. Nature, 2004, 432: 892-897.
[16] 邓晋福, 苏尚国, 赵海玲, 等. 华北地区燕山期岩石圈减薄的深部过程[J]. 地学前缘, 2003, 10(3): 41-50.
[17] 白志民, 许淑贞, 葛世伟. 八达岭花岗杂岩[M]. 北京: 地质出版社, 1991. 1-172.
[18] 北京市地质矿产局. 北京市区域地质志[M]. 北京: 地质出版社, 1991. 1-598.
[19] 河北省地质矿产局. 河北省北京市天津市区域地质志[M]. 北京: 地质出版社, 1989. 1-741.
[20] Bergantz G W. Underplating and partial melting: Implications for melt generation and extraction[J]. Sci, 1989, 245: 1093-1095.
[21] 乔彦超, 赵桂萍, 石耀霖, 等. 青藏高原隆升速率对冻土层形成影响的数值模拟[J]. 地质学报, 2010, 84(6): 901-908.
[22] Rutter M J , Wyllie P J. Melting of vapour-absent tonalite at 10 kbar to simulate dehydration-melting in the deep crust[J]. Nature, 1988, 331(6152): 159-160.
[23] 吴宗絮, 邓晋福, Wyllie P J, 等. 冀东黑云母片麻岩在1Gpa压力下脱水熔融实验[J]. 地质科学, 1995, 30(1): 12-18.
[24] 胡圣标, 何丽娟, 汪集. 中国大陆地区大地热流数据汇编(第三版)[J]. 地球物理学报, 2001, 44(5): 611-626.
[25] 邓晋福, 苏尚国, 赵国春, 等. 燕山造山带花岗岩和大陆地壳改造和生长[A]. 肖庆辉等编. 中国典型造山带花岗岩与大陆地壳生长研究[C]. 北京: 地质出版社, 2009. 119-198.
[26] 赵越, 陈斌, 张拴宏, 等. 华北克拉通北缘及邻区前燕山期主要地质事件[J]. 中国地质, 2010, 37(4): 900-915.
[27] 乔彦超, 刘翠, 石耀霖, 等. 华北克拉通燕山期岩浆活动的数值模拟[J]. 地球科学-中国地质大学学报, 2012, 37(5): 1-10.
[28] Davis G A, Zheng Y D, Wang C , et al. Mesozoic tectonic evolution of the Yanshan fold and thrust belt with emphasis on Hebei and Liaoning Provinces, northern China[J]. GSA, Mem, 2001, 194: 171-197.
[29] 刘翠, 邓晋福, 苏尚国, 等. 北京云蒙山片麻状花岗岩锆石SHRIMP定年及其地质意义[J]. 岩石矿物学杂志, 2004, 23(2): 141-146.
[30] 樊祺诚, 刘若新, 李惠民, 等. 汉诺坝捕虏体麻粒岩锆石年代学与稀土元素地球化学[J]. 科学通报, 1998, 43(2): 133-137.
[31] 樊祺诚, 隋建立, 刘若新, 等. 汉诺坝榴辉岩相石榴辉石岩岩浆底侵作用新证据[J]. 岩石学报, 2001, 17(1): 1-6.
[32] 邓晋福, 刘厚祥, 赵海玲, 等. 燕辽地区燕山期火成岩与造山模型[J]. 现代地质, 1996, 10(2): 137-148.