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在地壳的增厚地区,岛弧和俯冲带,区域动热变质作用通常与板块的聚合作用有关,这些地区的岩石类型表明变质作用与构造岩组构的发育过程有密切的对应关系。洋底和埋深变质作用具有区域性分布的特点,但许多研究者认为这类变质作用与上述动热变质作用截然不同,主要由于缺少构造岩组构方面的资料,Coombs(1961)提出了埋深变质作用并将其从区域变质作用类型中划分出来,对埋深变质作用期间控制矿物转变的有关因素的研究取得显著进展,但对变质作用发展的地球动力环境问题则很少给予重视,在正常的地热梯度影响下埋深变质作用通常认为与埋深作用有关,但这种解释不能令人信服,本文则提出扩张环境中形成的埋深变质作用的新模式。埋深变质作用发生于巨厚的碎屑和火山碎屑岩系列中,岩石圈的变动是产生这一巨
In the thickening area of the crust, the island arc and subduction zone and regional dynamic thermal metamorphism are usually related to plate polymerizations. The rock types in these areas indicate that the metamorphism closely correlates with the tectonic rock fabric development. The ocean bottom and burial metamorphism have the characteristics of regional distribution. However, many researchers think that these metamorphism is completely different from the above-mentioned dynamic thermal metamorphism mainly due to the lack of information on the tectonic rocks. Coombs (1961) Deep metamorphism and its classification from the type of regional metamorphism, made significant progress in the study of the related factors controlling the mineral transformation during the metamorphism of the deep metamorphism, but paid little attention to the problems of the geodynamic environment for the development of the metamorphism. Implications of normal geothermal gradients are generally considered to be related to burial depths, but this interpretation is not convincing. In this paper, a new model for the metamorphism of burial depths in the expanding environment is proposed. The metamorphism of burial depth occurred in a series of thick clastic and volcaniclastic rocks, the change of lithosphere is to produce this giant