应用重磁资料对沂沭断裂带及其周围构造特征的初步分析

一、前言沂沭断裂带是郯庐断裂在我省的一部分。郯庐断裂自从1957年航磁首次发现以来,引起了地质界的重视,有人认为郯庐断裂是我国东部一条北北东向切割上地幔的深大断裂,其长度远远超出了郯城至庐江的范围。而沂沭断裂带又是郯庐断裂露出最好的一段,是揭示郯庐断裂奥秘的一个窗口。前人曾做过大量地质调查工作,是研究程度较高区段。早在1948年我国著名地质学家李四光教授指出:“横过山东从南边的沂水到北边

PRELIMINARY STUDY ON THE STRUCTURAL CHARACTERISTICS OF THE YISHU FAULT ZONE AND ITS SURROUNDING AREAS BY USING GRAVITATIONAL AND MAGNETIC SURVEYING DATA

The Yishu Fault Zone(a segment of the Tancheng--Lujiang Fault Zone in Shandong Province)and the structures in its surrounding areas have been clearly shown on the gravitational and magnetic maps;the Yishu Fault Zone is expressed as a NE-trending gravity gradient zone and a ran- tdom magnetic zone,whereas the boundary between the Jiaonan Uplift and he Jiaolai Depression on the east side of the Yishu Fault Zone is indicated by a distinct gravity gradient and an aeromagnetic linear normal anomaly, both of whic...