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鹤庆盆地是青藏滇缅印尼巨型歹字型构造与川滇经向构造带复合部位的一个山间盆地,它的形成与南北向断裂密切有关,东西向冲断层及基性岩脉也相当发育。在晚近地质时期,它们都在强烈活动,因此,本区是构造的强化地带。 笔者在开展滇西北红河断裂带新活动的研究工作中,发现了鹤庆盆地一起古地震事件,古地震遗迹保留在盆地西部山麓的缓坡带上,主要表现为: 1.地震断层(照1、2):在南半榜洗马池水库北侧及鹤云寺西缓山坡上均有发现。两处均由中更新世及晚更新世河湖相亚粘土、亚砂土、中—细砂层及砂砾石层组成。断层断开了最新的晚更新世地层。在剖面
The Heqing Basin is a mountain basin of the Tibetan-Burma-Indonesia-Indonesia giant-type structure and the Sichuan-Yunnan-meridional tectonic belt. Its formation is closely related to the north-south fault. The east-west thrust faults and the basic dikes also develop well . In the late geological period, they are all in strong activity, so this area is a tectonic strengthening zone. In the research work on the new activity of the Honghe fault zone in the northwestern Yunnan Province, we found an ancient earthquake event in the Heqing Basin. The paleoearthquakes remained on the gentle slope belt of the foothills in the west of the basin. The main features are as follows: 1. Seismic fault (1, 2): Found in the south half of the list of the south side of the wash Ma Chi reservoir and Hemingsi West gentle hillside. Both are composed of mid-Pleistocene and late Pleistocene loam-lake sub-clays, sub-sands, medium-fine sand and gravel layers. The fault disconnected the latest Pleistocene strata. In profile