动态熔融过程中岩石的剪切压熔作用及变形-熔融结构模型
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P581

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国家自然科学基金项目(编号40372095)资助的成果。


Shearing and Pressing Melting Mechanism and Deformation-Melting Structure Model of Rocks in Dynamic Melting Process
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    摘要:

    本文以细粒辉长岩、中粒花岗岩、细粒斜长角闪岩和二辉麻粒岩等几种岩石类型为实验样品,进行了高温高压条件下岩石的变形、熔融试验。通过对实验样品详细的变形、熔融特征研究和应力应变分析,得出了共轭扇式变形-熔融模型可能更能反映自然实际条件下动力变形、熔融的平面分布特征。在动力熔融概念和分层熔融模式提出的基础上,本文提出如下几点设想:1岩石圈脆-韧性转变域内的岩石在构造动力条件下可发生动力熔融,并且其平面分布呈共轭扇式变形-熔融结构展布;其作用机理为剪切压熔机制控制下的各种有利促熔条件控熔。2动力熔融概念的提出,大大扩展了熔融的发生域和岩浆源地的分布范围,使得熔融或岩浆的产生不再只限于上地幔或壳幔边界,而是分布在一个相当宽广的温压和组分范围内,其热力来源也不再只受地温梯度控制,而是有热力、动力两种来源。3在造山带分层熔融模式提出的基础上,重新分析了岛弧钙碱性安山岩、类埃达克岩、同构造花岗岩的成因问题,提出了岛弧钙碱性安山岩的分层熔融混合岩浆成因和类埃达克岩、同构造花岗岩的动力熔融成因;并提出了裂谷拉伸环境可能存在分层熔融模式和有关分层熔融模式多类型的设想。

    Abstract:

    In this paper, gabbro, granite, granulite and plagioclase amphibolite samples were studied by high-temperature and high-pressure deformation-melting experiment. Through particular study on the deformimg and melting characteristics and the stress-strain analysis on experimental samples, the conjugate fan deformation-melting structure model was thought to represent deformation-melting characteristics in natural conditions. On the basis of dynamic and delaminating melting, we got several cognitions: (1) In brittle-ductile transition, dynamic melting and the conjugate fan structure can occur in the lithosphere in a dynamic condition. The dynamic melting is controlled by the shearing and pressing melting mechanism. (2) The phenomenon of dynamic melting can extend the scope of melting in the lithosphere, which makes the melting occur in a more broad range of temperature, pressure and composition, but not only be defined in the upper mantle or the boundary between crust and mantle. The origin of heat cannot yet be controlled by the ground temperature only, but has two origins of ground temperature and dynamic heating. (3) On the establishing of the delaminating melting model, the genesis of island arc calc-alkaline andesite, I-type adakite and syntectonic granite were analyzed again. The delaminating melting-magma mixing genesis of island arc calc-alkaline andesite and the dynamic melting genesis of I-type adakite and syntectonic granite were advanced. The possibility of delaminating melting in a rift environment and the typology of delaminating melting were discussed at the same time.

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李化启,梁一鸿,马瑞.2006.动态熔融过程中岩石的剪切压熔作用及变形-熔融结构模型[J].地质学报,80(8):1161-11671238.
LI Huaqi, LIANG Yihong, MA Rui College of Earth Science, Jilin University, Changchun, Jilin,.2006. Shearing and Pressing Melting Mechanism and Deformation-Melting Structure Model of Rocks in Dynamic Melting Process[J]. Acta Geologica Sinica,80(8):1161-11671238.

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  • 最后修改日期:2006-01-10