1.

論文(リポジトリ)

論文(リポジトリ)
林, 大五郎 ; Hayashi, Daigoro
出版情報: 南極資料.  70  pp.15-24,  1980-09-30.  国立極地研究所 — National Institute of Polar Research
URL: http://hdl.handle.net/20.500.12000/2907
概要: Two mechanisms for the rising of plutonic rocks in terms of their origins are plausible. One is the rising resulted from the buoyancy of acid plutons, e.g. granite and migmatite which are lighter in density, being 2.67 and 2.76 respectively. The other is the rising due to the squeezing of mafic and ultramafic plutons, e.g. peridotite and gabbro which have heavier densities of 3.23 and 2.98 respectively. There has been no verification for the mechanism of squeezing so far, though the mechanism by buoyancy has already been proposed by such authors as RAMBERG (Gravity, Deformation and the Earth's Crust, Academic Press, 214p, 1967) and KIZAKI (J. Fac. Sci. Hokkaido Univ., Ser. 4, 15, 157, 1972) and others. The term squeezing signifies that when a pluton is heavier than its surrounding rocks (crust), the pluton is squeezed out by the pressure of the surrounding rocks. The rising of pluton by squeezing is demonstrated numerically by a computer simulation in the present paper.<br />深成岩の上昇に関して,それらの成因上2つの機構が考えられる.1つは酸性岩,すなわち密度2.67g/cm^3の花崗岩や2.76g/cm^3のミグマタイトなどの,浮力による上昇であり,他は,超塩基性ないし塩基性岩,すなわち密度3.23g/cm^3のカンラン岩や2.98g/cm^3のハンレイ岩などの,しぼり出しによる上昇である.浮力による上昇機構はRAMBERG(Gravity,Deformation and the Earth's Crust, Academic Press, 214p, 1967)やKIZAKI(J. Fac. Sci. Hokkaido Univ., Ser. 4, 15, 157, 1972)らによってすでに提案されているが,しぼり出し上昇の機構に関する検証はまだない.しぼり出しとは,深成岩―周囲岩体より重い―があるとき,その深成岩が周囲岩体の圧力によってしぼり出されることを意味する.本論文では,この深成岩のしぼり出しによる上昇を,数値的にシミュレートした. 続きを見る
2.

論文(リポジトリ)

論文(リポジトリ)
Hayashi, Daigoro ; 林, 大五郎
出版情報: 琉球大学理学部紀要 = Bulletin of the College of Science. University of the Ryukyus.  pp.11-21,  1980-09.  琉球大学理学部
URL: http://hdl.handle.net/20.500.12000/2629
3.

論文(リポジトリ)

論文(リポジトリ)
Hayashi, Daigoro ; 林, 大五郎
出版情報: 琉球大学理学部紀要 = Bulletin of the College of Science. University of the Ryukyus.  pp.63-80,  1980-03.  琉球大学理学部
URL: http://hdl.handle.net/20.500.12000/2630
概要: Rock bodies are assumed to be composed of a two elements Maxwell and a generalized Maxwell model. The finite element formulation of these two viscoelastic materials is that viscous term within constitutive equation of the materials is regarded as initial strain and the unknown displacements are calculated for suitable time interval by the stiffness equation which is derived from the variational principle of elasticity. The resultant computer program of the two elements Maxwell model is adopted to a simple problem of stress response in order to be tested. Numerical and analytical solutions fit well together. It is interesting that tensile stress is observed parallel to contractive strain in this test. 続きを見る