房山变质核杂岩基底拆离断层韧性剪切变形构造及环境分析

姚丽景; 颜丹平; 胡玲

房山变质核杂岩基底拆离断层韧性剪切变形构造及环境分析

中国地质大学地质过程与矿产资源国家重点实验室, 北京 100083

基金项目:

国家自然科学基金项目 40472106

国家自然科学基金项目 40434011

详细信息

作者简介:
姚丽景(1982-), 女, 主要从事构造地质方面的研究.E-mail: yaolijingaaa@163.com

中图分类号: P554
计量
- 文章访问数: 2974
- HTML全文浏览量: 150
- PDF下载量: 358
- 被引次数: 0
出版历程
- 收稿日期: 2006-09-08
- 刊出日期: 2007-05-25

Structure Style and Temperature-Pressure Estimation of the Detachment Fault Zone around Fangshan Dome, Western Hills of Beijing

State Key Laboratory o f Geological Processes and Mineral Resources, China University o f Geosciences, Beijing 100083, China

摘要

摘要: 在房山岩体南北缘出露有太古代(基底) 官地杂岩, 官地杂岩与上覆盖层不同地层之间发育一条基底韧性拆离断层.宏观及微观尺度上拆离断层运动学标志均指示SE; 剪切带内发育区域动力变质作用下的矿物组合角闪石-斜长石及硅值较高的白云母, 对其进行电子探针分析, 计算出拆离断层韧性剪切变形的温压条件为: 温度492~555 ℃, 压力0.33 Gpa左右, 达到低角闪岩相.按正常的静岩压力计算, 该韧性剪切作用发生于地表以下12.9 km左右, 代表了中地壳韧性流变的变形环境.野外观察发现房山侵入体与官地杂岩及该韧性剪切带间均呈明显的侵入接触关系, 在侵入岩体南北边缘有大量的片麻岩等捕虏体, 沿杂岩的片麻理或韧性构造面理, 发育大量的石英二长闪长岩脉, 岩脉成分与房山岩体一致, 因此该韧性剪切带的形成应早于房山岩体侵位.如对房山岩体的侵入和改造进行复原和恢复, 该韧性剪切带代表了早期的伸展作用, 可能与房山伸展穹隆体的韧性变形同期.
- 房山变质核杂岩 /
- 韧性剪切带 /
- 石英矩形条带 /
- 角闪石-斜长石矿物对 /
- 白云母
Abstract: The basement ductile shear zone of the Fangshan extensional dome separates the Archean Guandi complex from various cover strata in southern and northern margins of Fangshan pluton.This ductile shear zone is composed of the ductilely deformed fabrics with an SE-ward kinematic, which can be deduced from rock and mineral deformations, including faultage offect and so on, on both macroscopic and microcosmic scales.Typical regional-dynamic metamorphic mineral pair hornblende-plagioclase and high pressure mineral muscovite with high Si are common and identified within the ductile shear zone.EPMA analysis of the mineral pair gives a metamorphic condition of T=492-555 ℃ and p=0.33 GPa, which indicates a metamorphic grade of lower-amphibolite facies and a depth of around 12.9 km estimated following a normal lithostatic pressure.Field evidences, including that Fangshan pluton intruded the Archean Guandi complex and the ductile shear zone, lots of gneissic xenolithes within the Fangshan pluton, and that a lot of quartz monzonite-diorite intruded along the fabric of the ductile shear zone, support that the ductile shear zone was formed before Fangshan pluton, and likely to be simultaneous with the formation of the Fangshan detachment zone of the extensional dome.
- Fangshan detachment zone /
- ductile shear zone /
- rectangle quartz ribbons /
- hornblende-plagioclase mineral pair /
- muscovite

HTML全文

图 1 周口店地区区域地质略图(据Yan et al., 2006修改)

1.太古界(官地杂岩); 2.中元古代长城系; 3.中元古代蓟县系; 4.新元古代青白口系; 5.寒武-奥陶系; 6.石炭-二叠系; 7.上三叠统; 8.侏罗系; 9.白垩系; 10.花岗闪长岩; 11.石英闪长岩; 12.云煌岩; 13.逆冲断层; 14.低角度正断层; 15.高角度正断层; 16.向斜轴迹; 17.背斜轴迹; 18.不整合; 19.S0面理; 20.S1片理; 21.侵入体流面; 22.研究范围

Fig. 1. Geological map of the Zhoukoudian area, SW of Beijing

下载: 全尺寸图片幻灯片

图 2 房山岩体与官地杂岩侵入关系

Fig. 2. Fangshan pluton intruding Guandi complex

下载: 全尺寸图片幻灯片

图 3 周家坡(A-A′, B-B′) 及南观(C-C′) 韧性剪切带地质剖面图(C-C′)

a.周家坡地区地质简图; 1.太古界; 2.前寒武系铁岭组; 3.前寒武系下马岭组; 4.下寒武统府君山组; 5.中、下寒武统; 6.中、上寒武统; 7.奥陶系马家沟组; 8.第四纪; 9.正断层; 10.倒转正断层; 11.地层产状; 12.倒转地层产状; b.南观地区地质简图; c.A-A′, B-B′和C-C′地质剖面图; 图c中Z代表周家坡, N代表南观

Fig. 3. Geological section of the ductile shear zone in Zhoujiapo (A-A′, B-B′) and Nanguan area (C-C′)

下载: 全尺寸图片幻灯片

图 4 剖面A-A′及B-B′中部分矿物显微变形特征

Z-1.剖面A-A′房山岩体长石、石英次生加大结构及长石的交代蠕英结构10×4 (+); Z-3.剖面A-A′韧性剪切带长英质岩石中发育的重结晶石英矩形条带10×4 (+); Z-5.剖面B-B′韧性剪切带含十字石二云母石英千糜岩中十字石及二云母定向特征10×4 (+); Z-6.剖面A-A′盖层铁岭组大理岩中方解石(白云石) 的定向特征10×4 (+)

Fig. 4. Part of microstructures within the geological sections of A-A′ and B-B′

下载: 全尺寸图片幻灯片

图 5 探针分析标本中各矿物分布特征

N-1.剖面C-C′: 斜长角闪糜棱岩中斜长石、角闪石定向10×20 (+); N-2.剖面C-C′: 斜长角闪糜棱岩中斜长石、角闪石定向10×20 (+); N-3.剖面C-C′: 二云母石英片岩中的石英、二云母定向10×20 (+); Z-4.剖面A-A′: 斜长角闪糜棱岩中斜长石、角闪石定向10×20 (+); Z-7.剖面B-B′: 含红柱石二云母石英岩中的红柱石、石英、二云母定向10×10 (+)

Fig. 5. Mineral assemblages in microprobe analytic specimens

下载: 全尺寸图片幻灯片

图 6 白云母中Si成分等值线与p、T关系

空心方块为Md/1M多型域, 实心方块为2M1多型白云母域, 叉型方块为过渡类型(Massone et al., 1991, 转苏尚国和赖兴运, 1994)

Fig. 6. Relation of Si isoline in muscovite vs. p, T

下载: 全尺寸图片幻灯片

图 7 与多硅白云母共生的钾长石、金云母(黑云母) +石英组合中多硅白云母Si原子数与p、T关系图解

图中符号表示实验的温度区间: 三角为350~400 ℃, 菱形为445~495 ℃, 方块为640~700 ℃ (Massone et al., 1991, 转苏尚国和赖兴运, 1994)

Fig. 7. Diagramming of Si atoms in muscovite in the combination of Ms+Kf+Phl/Bi vs. p, T

下载: 全尺寸图片幻灯片

表 1 角闪石-斜长石探针分析结果(%)

Table 1. Microprobe analytic results of hornblendes-plagioclases pair

表 2 白云母探针分析结果(%)

Table 2. Microprobe analytic results of muscovite

表 3 角闪石-斜长石的温压计算

Table 3. Calculated results of T、p of hornblende-plagioclase

参考文献(47)

[1]	Hammarstrom, J.M., Zen, E.A., 1986. Alminum in hornblende: An empirica ligneous geobarometer. American Mineralogist, 71: 1297-1313.
[2]	He, B., Xu, Y.G., Wang, Y.M., et al., 2005. Magmatic diapir of Fangshan pluton in the Western Hills, Beijing and its geological significance. Earth Science-Journal of China University of Geosciences, 30 (3) : 298-307 (in Chinese with English abstract).
[3]	Holland, T., Blundy, J., 1994. Non-ideal interactions in calcic amphiboles and their bearing on amphibole-plagioclase thermometry. Contrib. Mineral. Petrol., 116: 433-447. doi: 10.1007/BF00310910
[4]	Hu, L., 1998. Introduction to microstructural geology. Geological Publishing House, Beijing (in Chinese).
[5]	Johnson, M.C., Rutherford, M.J., 1988. Experimental calibration of an aluminium-in-hornblende geobarometer applicable to calk-alkaline rocks. EOS Transactions, 69 (44) : 1511-1988.
[6]	Johnson, M.C., Rutherford, M.J., 1989a. Experimentally determined conditions in the Fish canyon tuff, Colorado, magma chamber. Petrology, 30 (3) : 711-737. doi: 10.1093/petrology/30.3.711
[7]	Johnson, M.C., Rutherford, M.J., 1989b. Experimental calibration of the aluminum-in-hornblende geobarometer with application of Long Valley caldera (California) volcanic rocks. Geology, 17 (9) : 837-841. https://pubs.geoscienceworld.org/gsa/geology/article-abstract/17/9/837/204999/Experimental-calibration-of-the-aluminum-in
[8]	Li, L.R., Wang, C.Z., 1996. Classification of multi-grain quartz ribbons in mylonites and their development conditions. Journal of Guilin Institute of Technology, 16 (3) : 224-231 (in Chinese with English abstract).
[9]	Lin, Z.Y., Liu, J.L., Fang, J.Y., 2002. Mechanisms of deformation and recrystallization of quartz during extension. World Geology, 21 (4) : 321-326 (in Chinese with English abstract).
[10]	Liu, G.H., Wu, J.S., 1977. Metamorphic rocks and metamorphic zones around Fangshan pluton. The Study of Geological Mineral Resources, (3) : 159-198 (in Chinese with English abstract). https://www.sciencedirect.com/science/article/pii/S0191814109000856
[11]	Liu, Z.H., Li, D.D., 1999. Recrystallization and its microfabrics in mylonite. Jilin Geology, 18 (4) : 32-37 (in Chinese with English abstract).
[12]	Ma, H.W., 2001. Introduction to crystallography thermodynamics. High Education Press, Beijing, 93-102 (in Chinese).
[13]	Massone, H.J., Scbreyer, W., 1989. Stability field of the high-pressure assemblage talc + phengite and two new phengite barometers. Eur. J. Mineral, (1) : 391-410. https://pubs.geoscienceworld.org/eurjmin/article-abstract/1/3/391/61460/Stability-field-of-the-high-pressure-assemblage
[14]	Shan, W.L., Fu, Z.R., 1987. A preliminary analysis of the horizontal laminar shear-flow structure in the Western Hills of Beijing. Earth Science-Journal of Wuhan College of Geology, 12 (2) : 113-120 (in Chinese with English abstract).
[15]	Shan, W.L., Wang, F.Z., Fu, Z.R., et al., 1989. On the tectonic evolution of cover rocks in the southern part of Western Hills of Beijing. Earth Science-Journal of China University of Geosciences, 14 (1) : 37-50 (in Chinese with English abstract).
[16]	Song, H.L., 1987. A primary analysis on the tectonic sequence in the southern part of the Western Hills of Beijing. Earth Science-Journal of Wuhan College of Geology, 12 (1) : 15-20 (in Chinese with English abstract).
[17]	Song, H.L., 1996. Characteristics of Fangshan metamorphic core complex, Beijing and a discussion about its origin. Geoscience, 10 (2) : 149-158 (in Chinese with English abstract).
[18]	Song, H.L., 2002. Some characteristics of metamorphic core complexes. Geological Bulletin of China, 21 (4-5) : 194-197 (in Chinese with English abstract).
[19]	Song, H.L., Ge, M.C., 1984. The Indosinian movement in the Western Hills of Beijing discussed in the light of the structural characteristics. Geological Review, 30 (1) : 77-80 (in Chinese with English abstract).
[20]	Song, H.L., He, B., Zheng, Z.S., et al., 1990. Denudational fault of West-Hill, Beijing. In: Zhang, J.S., Shan, W.L., eds., The geological study of Western Hills of Beijing. China University of Geosciences Press, Wuhan, 19-28 (in Chinese).
[21]	Song, H.L., Shan, W.L., 1987. Denudational fault, intraplate subhorizontal shear zone and extensional tectonics. Earth Science-Journal of Wuhan College of Geology, 12 (5) : 535-541 (in chinese with English abstract).
[22]	Su, S.G., Lai, X.Y., 1994. A review of new geobarometers applicable to high-pressure metamorphism. Geological Science and Technology Information, 13 (2) : 91-97 (in Chinese with English abstract).
[23]	Xiao, Q.H., 1985. The microstructure of mylonites and their origin-A review. In: Structural Geology Reviews, (5) : 203-216. Geological Publishing House, Beijing (in Chinese).
[24]	Xu, Z.Q., Wang, G.F., Fu, Z.K., 1985. Ductile decollement shear zone in the Western Hills of Beijing. Bulletin of the Chinese Academy of Geological Sciences, (11) : 37-52 (in Chinese with English abstract).
[25]	Yan, D.P., Zhou, M.F., Song, H.L., et al., 2005. A geochronological constraint to the Guandi complex, Western Hills of Beijing, and its implications for the tectonic evolution. Earth Science Frontiers, 12 (2) : 332-337 (in Chinese with English abstract).
[26]	Yan, D.P., Zhou, M.F., Song, H.L., et al., 2006. Mesozoic extensional structures of the Fangshan tectonic dome and their subsequent reworking during collisional of accretion of the North China block. Journal of the Geological Society, London, 163: 127-142. doi: 10.1144/0016-764904-154
[27]	Zhao, S.R., Bian, Q.J., Ling, Q.C., 2004. Crystallography and mineralogy. High Education Press, Beijing, 376 (in Chinese).
[28]	何斌, 徐义刚, 王雅玫, 等, 2005. 北京房山岩体岩浆底劈构造及地质意义. 地球科学——中国地质大学学报, 30 (3) : 298-307. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX200503005.htm
[29]	胡玲, 1998. 显微构造地质学概论. 北京: 地质出版社.
[30]	李兰荣, 王春增, 1996. 糜棱岩中多晶石英条带的类型及形成条件. 桂林工学院学报, 16 (3) : 224-231. https://www.cnki.com.cn/Article/CJFDTOTAL-GLGX603.003.htm
[31]	蔺志永, 刘俊来, 方建勇, 2002. 伸展作用过程中石英变形与重结晶的微观机制. 世界地质, 21 (4) : 321-326. doi: 10.3969/j.issn.1004-5589.2002.04.002
[32]	刘国惠, 伍家善, 1977. 北京房山岩体围岩的变质岩石学和变质带. 地质矿产研究, (3) : 159-198.
[33]	刘正宏, 李殿东, 1999. 糜棱岩的重结晶作用及其显微组构. 吉林地质, 18 (4) : 32-37. https://www.cnki.com.cn/Article/CJFDTOTAL-JLDZ199904004.htm
[34]	马鸿文, 2001. 结晶岩热力学概论. 北京: 高等教育出版社, 93-102.
[35]	单文琅, 傅昭仁, 1987. 北京西山水平分层剪切流变构造初探. 地球科学——武汉地质学院学报, 12 (2) : 113-120. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX198702000.htm
[36]	单文琅, 王方正, 傅昭仁, 等, 1989. 论北京西山南部的盖层构造演化. 地球科学——中国地质大学学报, 14 (1) : 37-50. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX198901007.htm
[37]	宋鸿林, 1996. 北京房山变质核杂岩的基本特征及成因探讨. 现代地质, 10 (2) : 149-158. https://www.cnki.com.cn/Article/CJFDTOTAL-XDDZ602.001.htm
[38]	宋鸿林, 1987. 北京西山南部构造序列初探. 地球科学——武汉地质学院学报, 12 (1) : 15-20. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX198701002.htm
[39]	宋鸿林, 2002. 关于变质核杂岩构造特征的几个问题. 地质通报, 21 (4~5) : 194-197. https://www.cnki.com.cn/Article/CJFDTOTAL-ZQYD2002Z1001.htm
[40]	宋鸿林, 葛梦春, 1984. 从构造特征论北京西山的印支运动. 地质论评, 30 (1) : 77-80. doi: 10.3321/j.issn:0371-5736.1984.01.011
[41]	宋鸿林, 何斌, 郑在胜, 等, 1990. 北京西山的剥离断层. 见: 张吉顺, 单文琅主编, 北京西山地质研究. 武汉: 中国地质大学出版社, 19-28.
[42]	宋鸿林, 单文琅, 1987. 剥离断层、板块内近水平的剪切带与伸展构造. 地球科学——武汉地质学院学报, 12 (5) : 535-541. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX198705013.htm
[43]	苏尚国, 赖兴运, 1994. 高压变质作用压力估算的热力学方法. 地质科技情报, 13 (2) : 91-97. https://www.cnki.com.cn/Article/CJFDTOTAL-DZKQ402.019.htm
[44]	肖庆辉, 1985. 糜棱岩的显微构造和成因(评述). 见: 构造地质论丛, (5) : 203-216. 北京: 地质出版社.
[45]	许志琴, 王国方, 符振康, 1985. 北京西山的深部韧性滑脱剪切带. 中国地质科学院院报, (11) : 37-52. https://www.cnki.com.cn/Article/CJFDTOTAL-DQXB198500002.htm
[46]	颜丹平, 周美夫, 宋鸿林, 等, 2005. 北京西山官地杂岩的形成时代及构造意义. 地学前缘, 12 (2) : 332-337. doi: 10.3321/j.issn:1005-2321.2005.02.035
[47]	赵珊茸, 边秋娟, 凌其聪, 2004. 结晶学及矿物学. 北京: 高等教育出版社, 376.