通天河活动断裂.PDFVIP

六、通天河活动断裂 通天河活动断裂（F36, F34 ）总体走向北西，发育线性分布的断层陡坎和泉华台地，切割 晚更新世—全新世泉华堆积，控制 4-6 级地震和低温温泉分布（吴珍汉等，2003d ，2005 ）。 在青藏公路西侧，沿通天河活动断裂发育近东西向小型拉分盆地，在拉分盆地边界发育近东 西走向的张扭性分支断裂。在九十四道班西南，沿通天河活动断裂（F36 ）发育500-600m宽 的断层谷地，其中分布4 条近东西走向的泉华垄，长 200-400m，宽20-40m ；在泉华垄之间 形成线性排列的多个上升泉泉眼，在泉华垄顶部发育近东西走向的构造裂缝，局部形成串珠 状排列的冻胀土丘、热融泥塘和较大规模的冰丘。 PART 6 TONGTIANHE ACTIVE FAULT The Tongtionhe active fault (F34, F36) trends in NW direction and controls linear distribution of fault scarps, Late Pleistocene-Holocene sinter deposits and epicenters of Ms 4.0-5.0 earthquakes (Wu et al., 2003d, 2005). E-W trending pull-apart basins, sinistral offset of streams and branch fractures formed along Tongtianhe active fault zone. In southwest of the 94th station of the Highway, fault valley of 500-600m wide formed along F36, accompanied by 4 sinter ridges of 200-400m long and 20-40m wide together with low temperature springs in summer, en-echelon pingos in winter, surface fractures and thawing ponds. 图58 通天河断裂平面地质图 图例说明：1-全新世冲洪积；2-走滑断裂；3-张扭性分支断裂；4-冰丘；5-等高线 (m) ；6-河流及流向；7- 电法勘探测线；8-铁路线；9-铁路大桥 Fig.58 Quaternary geological map of Tongtianhe active fault zone based on 1:2000 mapping in January-February of 2002. Explanation: 1-Holocene deposits; 2-strike-slip fault; 3-shear-extensional branch fault; 4-pingo in winter; 5-elevation contour (m); 6-river and flow trend; 7-geophysical profile; 8-railway line; 9-railway bridge 图59 通天河活动断裂陡坎与泉华台地 （镜头向北东东，摄于2002 年 2 月） Fig.59 View east northeastward at Tongtianhe active fault controlling linear distribution of sinters in February 2002 图60 通天河沿 94 道班西南沿断裂分布的泉华垄 铁路西侧沿F36断裂破碎带发育长条状泉华垄和冰丘、热融湖塘；镜头方向 100°，摄于2002 年 6 月。 Fig.60 View eastward at sinter ridges along Tongtianhe