【摘要】 区域性大断裂(东海盆地西缘断裂)以东的磁性基底深度一般为7—10公里,并向断裂方向加深。推测基底以上的地层可能有数公里至近10公里弱磁性的、已固结或浅变质的前中新世岩层存在。 区域性大断裂以西区域,可能存在两个磁性层,即一个为中生代岩浆侵入体和近地表浅层覆盖的火山岩层;另一个磁性层则位于更深处。两个磁性层之间可能包含中生界中早期及前中生界的巨厚弱磁性变质岩系。 在两条与海岸近于平行的基底深拗陷带之间是一条基底相对隆起带,是深断裂岩浆活动的产物。 三条带的延伸,向北可能终止于东福山北东东向断裂带,向南则可能与福建省海岸平行至少延至台湾海峡南端。更多还原

【Abstract】 The depth of the magnetic basement east of the great regional fault (the western fault of the East China Sea basin) is generally 7-9km. It deepens towards the direction of the fault. It is infered that pre-Miocene solid and metamorghic about a few to near 10km. thick exists on the basement.To the west of the great regional fault there may be two magnetic layers. One composes of thin volcanic rocks near the surface and mesozoic intrusive magma, the other lies deeper. Between the two magnetic layers there may be weak metamophic rock layer of great thinkness formed during early and middle Mesozoic and pre-mesozoic.Between two basement depression belts parallel to the shore is a relative swell belt. It is the product of magmatic action of the deep fault.The northward extension of three belts are broken off by the Dong Fu Shan northeast-east fault. They are parallel to the Fujian Coast and extend to the south of the Taiwan Strait at least.更多还原