【摘要】 壳-幔细结构与地壳运动、构造变形、地震活动及其成因机制、岩浆活动、变质作用与成矿作用、地球的温度变化及演化等基本地学问题密切相关。本文以我国苏、浙、皖区和东海大陆架地壳细结构研究为例,结合国内外深部地质资料,探讨了异常地幔的三种可能成因;指出了苏南-东海大陆架有滑脱构造的某些地壳细结构特征;认为Moho面之下的M₀面可作为Air?模式的均衡补偿面。最后,文中给出了苏、浙、皖区均衡模式。更多还原

【Abstract】 The fine structure of crust-mantle is closely relevant to some basic geoscienceproblems, such as tectonism, deformations, seismicity and its genesis, magmatism,metamorphism and metallization,change of the earth’s temperature and its evolutionand so on. The problems on the genesis of anomalous mantle, the thin-skinned and lithospheric plate tectonics and the isostatic adjustment and isostatic models arediscussed based on the study of crustal fine-structure in the Jiangsu-Zhejiang-Anhui region combined with the deep-level geological data at home and abroad inthis paper. The following knowledges are gained. 1.There are three kinds of possible geneses of anomalous mantle, i. e., A. themodel of up-doming and heating of the low-velocity channel （LVC） accompaniedby partial melting; B. the model of diapiring of mixed asthenospheric materialand molten material of the LVC; C. the model of direct upwelling of astbenosphe-ric material penetrating through the lithosphere. 2.The thin-skinned plate, whichis considered as the basic element of the lithospheric plate, not only exists in sia-lic crust but also is fit for the lower crust-top of upper mantle; and there aresome crustal fine-structure features of detachments across southern Jiangsu-continen-tal shelf of the East China Sea. 3. During the isostatic adjustrnent the M₀ discon-tinuity, a top surface of the low-density layer in the uppermost mantle, could betaken as the isostatic compensation surface of Airy model. The isostatic models ofthe Jiangsu-Zhejiang-Anhui region are given in tbe paper.更多还原