滇中地区昆阳群中的刺穿构造  

THE DLAPIR IN KUNYANG GROUP OF CENTRAL YUNNAN

作　　者：孙克祥[1,2] 邓永寿 

机构地区：[1]云南省地质科学研究所 [2]西南有色地勘局313队

出　　处：《云南地质》1998年第1期31-35,共5页Yunnan Geology

摘　　要：滇中中元古界昆阳群地层中出现大小不等的２００多个刺穿构造，它们由脆性变形和塑性变形两部分或其一部分组成。由两条不同性质断裂挟持的（下盘为逆断裂，上盘为正断裂）老地层组成的构造岩片，斜冲于新地层之中，形成刺穿构造。它们是区域内逆冲推覆断裂同期及后期活动产物，其脆性变形部分是逆冲推覆断裂及派生次级逆冲推覆断裂的特殊前峰，即楔形前峰；而塑性部分是逆冲推覆断裂形成过程中，由岩石破碎－受拉张、垮塌－受压应力、地下水参与下塑变，并沿断裂流变侵位固结的产物，称之为因民角砾岩。刺穿构造组构复杂，可分成复式向斜型、复式背斜型、叠瓦型、半边背斜型及因民角砾岩型等。区域上刺穿构造组合成单冲式和双冲式。刺穿构造内铜矿体为改造富集型的脉状铜矿体，形态复杂多为盲矿体。它们受刺穿构造内与边界断裂平行的断裂系和有利地层（因民组三段、落雪组一、二段）、岩性（不纯白云岩）双重控制。此类型矿床在云南铜矿中占有较大比例，有大型矿床１个、中型４个、小型２７个及众多矿点。探明储量超过１３０万吨，且都为富矿。AbstractThere are more than 200 large or small diapirs in middle Proterozoic Kunyang Group in central Yunnan.They are composed of brittle and plastic deformations or either of them. The diapir is formed by the structural rock sheet of old strata between two faults with different nature (reversed in lower wall and normal in upper one) thrusting into the relatively new strata. They are contemporaneous with or later than the napping thrust in this region. The brittle deformation part is the special front of the napping thrust and its secondary derived one, ie the sphenoid al front. And the plastic deformation part is formed by the rocks fractured -extended, collapsed and deformed in platic state by pressure and influence of underground water, then flowing, intruding and consolidated along fault in the napping thrust formation, eg, the so-called Yinmin Breccia.The diapirs are complicated in structure, which can be divided into the types of synclinore, anticlinorium, imbrication, hemi-anticline and Yinmin Breccia, etc. And regionally they are composed of mono-thrusting and bithrusting forms.The Cu orebody in diapir belongs to the vein-like Cu orebody of reformation-concentration type with complecated forms and mostly being blind orebody. They are controlled by the fault system, parallel to the boundary fault, in diapir, the advantageous strata(the third member of Yinmin Formation and the first, second members of luoxue Formation) and the lithlogical character(unpurified dolomitite). This ore deposit type including 1 large, 4 medium, 27 small ore deposits and many ore occurrences, takes an important place in the Yunnan Cu deposits. The reserves by exploration are more than 1,300,000 tons and all in high grade.

关 键 词：刺穿构造 逆中推覆断裂 铜矿床 昆阳群 滇中地区 

分 类 号：P618.410.2[天文地球—矿床学] P514[天文地球—地质学]