东秦岭岩石层的地电模型  

THE LITHOSPHERIC GEOELECTRIC MODEL OF EAST QINLING

作　　者：李立[1] 杨辟元[1] 段波 李艳军[1] 金国元[1] 钟清[1] 刘玉华 万明浩[2] 高平[3] 

机构地区：[1]地质矿产部地球物理地球化学勘查研究所,河北廊坊065000 [2]同济大学海洋系,上海200092 [3]国家地震局地质研究所,北京100029

出　　处：《地球物理学报》1998年第2期189-196,共8页Chinese Journal of Geophysics

基　　金：国家自然科学基金

摘　　要：根据大地电磁测深结果，东秦岭河南叶县—湖北南漳地区的岩石层由4个电性单元组成，其中华北地块南缘为相对高温的低阻区；秦岭北部为低温的高阻异常区；南秦岭为高温的低阻区，岩石层平均厚度仅80km，南秦岭的南部推覆到扬子地块之上达40—50km；扬子地块为相对低温的中等电阻率区，岩石层厚度150—200km．利用秦岭地区地壳上地幔岩石样品高温高压条件下电阻率的测定结果推断了各单元岩石层内电性层可能的岩石组成类型，并建立了剖面通过地区岩石层的地电模型．The lithospheric profile of Henan Ye-clan-Hubei Nanzhang, according to theresults of magnetotelluric sounding divided to four electrical units. The south fringe ofNorth china massif is a higher temperature and low resistivity region; the north partof Qinling is a low temperature and high resistivity anomalous region; the SouthQinling is a high temperature low resistivity region, the thickness of lithosphere only80 km, the south part of South Qinling push over south ward to the Yangzi massifabout 40--50 km; the Yangzi massif is a region of medium resistivity with lowertemperature, its thickness of lithosphere about 150--200km. According to the resultsof high temperature high pressure resistivity measurement of crust and mantlespecimens of Qinling; the results of MT sounding and the local geothermal heat flowed to infer the lithospheric material composition which profile acrossed by, thenprovided the lithospheric Geoelectric model.

关 键 词：东秦岭 岩石层 大地电磁测深 电阻率 地电模型 

分 类 号：P584[天文地球—岩石学] P631.322[天文地球—地质学]