摘要
本文主要依据１：２０万德化、福清幅重力场特征，结合其它区域物探及地质、区域化探、遥感资料，把本区构造单元划分为３个Ⅰ级构造单元，３个Ⅱ级构造单元；推断解释环状构造两个，断裂构造带３３条，其中深断裂带５条，大断裂带９条，一般断裂带１９条；圈定隐伏、半隐伏酸性—超基性岩体３８个，半隐伏地层５处，推断火山构造一个；把测区火山岩基底划分为三大区，将Ⅱ区又进一步划分为３个次级区；圈定成矿远景预测区５个；通过重力剖面地壳模型计算，得出本区地壳分上、中、下三层，属富硅富铝的大陆型地壳。
The paper focuses on the discussion of the regional gravity anomaly in Eastern Fujian. Based on the features of the gravity field from the 1: 200000-scale regional geological survey,and on the data of regional geological survey, regional physical prospecting, seochemical exploration and remote sensing, the tectonic unit of the surveyed area can be divided into three Ⅱ-grade tectonic units, and the gravity anomaly of the basement of volcanic rocks in the surveyed area into three anomaly provinces. By inferring, it was found in the surveyed area that there are two ring-like structures, 33 fault structure belts (including 5 deep faults and 9 major faults) and one volcanic structure. To outline 38 buried and semiburied acid-ultrabasic rock masses, 5 semi-buried strata and 5 prospective metallogenic prognosis provinces. The calculating results from the crustal gravity model show that the crust in the area is madeup of the upper, middle and lower Parts, which belongs to the silicon-aluminum-rich continent crust.
出处
《福建地质》
1996年第3期117-162,共46页
Geology of Fujian
关键词
福建
区域地质构造
火岩岩基底
重力异常
Eastern Fujian
basement of volcanic rock
buried and semi-buried rock mass
gravityanomaly
regional geological structure
