论文部分内容阅读
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。
The depth of the magnetic basement to the east of the regional major faults (the western margin of the East China Sea Basin) is generally 7-10 km and deepens toward the direction of the fault. It is speculated that the strata above the basement may exist from kilometers to nearly 10 kilometers of weakly magnetically formed, previously metamorphosed, pre-Miocene strata. To the west of the regional major fault, there may be two magnetic layers, one is a volcanic layer covered by Mesozoic magma intrusions and near surface shallow layers; the other is located deeper. The two magnetic layers may include the giant and weak magmatic metamorphic rocks in the Mesozoic middle and early Mesozoic and Mesozoic. Between two deep subduction zones parallel to the coast, there is a basement uplifted belt that is the product of deep-fault magmatic activity. The extension of the three belts may end northward to the east-northeast fault zone in east Fukuyama, and to the south may extend parallel to the coast of Fujian Province at least to the southern end of the Taiwan Strait.