大别山地区岩石高压弹性波速及其对岩石圈组成和壳-幔循环的限制
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摘要
在室温和等静水压下测定了大别超高压变质带榴辉岩和麻粒岩至1 GPa压力下的P波和S波速度.研究表明,超高压榴辉岩具有高密度(3.3～3.6g·cm~(-3))、高波速和弱的各向异性(1.4％～2.6％),麻粒岩呈现了低的密度(2.8～3.1g·cm~(-3))和波速、高的Poisson比(0.28～0.29),高压榴辉岩具有最强的各向异性(6.1％～8.4％).岩石波速同深地震测深剖面对比表明,大别造山带下地壳可能存在榴辉岩,但是数量应很少,而上地幔具有同超高压榴辉岩或者蛇纹石化/含水纯橄岩相似的地震波速度.推测地壳物质以榴辉岩的形式,通过拆沉作用进入地幔,少部分榴辉岩折返回地壳.
引文
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14 Saxena S K. Earth mineralogical model: Gibbs free energy minimization computation in the system MgO-FeO-SiO_2． Geochim Cosmochim Acta, 1996, 60(13) : 2379
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16 李曙光,等.大别山俯冲陆壳的再循环--地球化学证据.中国科学,D辑,1997,27(5) :412
2 高山,等.大别超高压榴辉岩高温高压下地震波速和密度的初步实验研究--对造山带地壳深部组成和莫霍面性质的启示.科学通报,1997,42(8) :862
3 Kern H, et al. Petrophysical studies on rocks from the Dabie ultrahigh-pressure(UHP) metamorphic belt, Central China: implications for the composition and delamination of the lower crust. Tectonophysics, 1999, 301: 191
4 Zhao Z, et al. Compressional wave velocities in eclogites of the Dabieshan, Central China to 5． 0 GPa: A preliminary result. The Re-view of High Pressure Science and Technology, 1998, 7: 12
5 从柏林,等.大别山-苏鲁超高压变质带研究的最新进展.科学通报,1999,44(11) :1127
6 游振东,等.东秦岭大别高压超高压变质带.武汉:中国地质大学出版社,1998． 7～12
7 Christensen N I. Measurements of dynamic properties of rock at elevated temperatures and pressures. In: Pincus H J, Hoskins E R, eds. Philadelphia, Pa: Measurements of Rock Properties at Elevated Pressures and Temperatures. American Society for Testing and Ma-terials, 1985． 93～107
8 Christensen N I. Poisson's ratio and crustal seismology. J Geophys Res, 1996, 101(B2) : 3139
9 Christensen N I, et al. Seismic velocity structure and composition of the continental crust: A global view. J Geophys Res, 1995, 100(B7) : 9761
10 Rudnick R L, et al. Nature and composition of the continental crust: A lower crust perspective. Reviewe of Geophys, 1995, 33 (3) : 267
11 王椿镛,等.大别造山带的地壳结构研究.中国科学,1997,27(3) :221
12 王椿镛,等.大别造山带地壳S波速度结构.地球物理学报,40(3) :337
13 Christensen N I. Pore pressure and oceanic crustal seiemic structure. Geophys J R Astron Soc, 1984, 79: 411
14 Saxena S K. Earth mineralogical model: Gibbs free energy minimization computation in the system MgO-FeO-SiO_2． Geochim Cosmochim Acta, 1996, 60(13) : 2379
15 Gao S, et al. How mafic is the lower continental crust? Earth Planet Sci Lett, 1998, 161: 101
16 李曙光,等.大别山俯冲陆壳的再循环--地球化学证据.中国科学,D辑,1997,27(5) :412
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