青藏高原北部巴颜喀拉构造带基底隆起的地震学证据  

Seismic evidence of the basement uplift in the Bayan Har tectonic belt,Qinghai,and its tectonic significance

作　　者：李秋生[1] 彭苏萍[1] 高锐[2] 范景义[3] 

机构地区：[1]中国矿业大学(北京校区),北京100083 [2]中国地质科学院地质研究所,北京100037 [3]国土资源部实物地质资料中心,河北三河065201

出　　处：《地质通报》2003年第10期782-788,共7页Geological Bulletin of China

基　　金：国家重点基础研究发展规划项目(编号:G1998040800)

摘　　要：过去曾笼统地认为巴颜喀拉构造带上万米的堆积主要是三叠系的复理石沉积。通过对沱沱河-格尔木深地震剖面资料的再认识发现,巴颜喀拉构造带的结晶基底埋深仅5km左右,比金沙江断裂带以南的羌塘地块北缘和昆仑山南缘的基底埋藏深度都要浅。进一步对青藏公路以东横穿巴颜喀拉构造带的几条深地震测深剖面进行分析,发现该基底隆起一直顺构造走向延伸,向东贯穿了整个构造带,推测它是扬子古陆块的残余。In the past it is generally thought that the up to 10000 m thick deposits in the Bayan Har tectonic belt are mainly Triassic flysch deposits. A further study of the data from the Tuotuo River-Golmud deep seismic profile reveals that the burial depth of the crystalline basement of the Bayan Har tectonic belt is only ～ 5 km, shallower than that of the basement of the northern margin of the Qiangtang and the southern margin of the Kunlun Mountains south of the Jinsha River fault. In combination of several deep seismic sounding profiles traversing the Bayan Har tectonic belt east of the Qinghai-Tibet Highway, it is found that the basement uplift might extend along the tectonic strike and eastward go through the whole tectonic belt. It is inferred that it represents remains of a ancient continental block.

关 键 词：青海东南部 巴颜喀拉构造带 基底隆起 地震证据 古陆块 地震学 

分 类 号：P54[天文地球—构造地质学] P315.2[天文地球—地质学]