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11.
华北克拉通中元古代岩墙群形成的构造应力场数值模拟 总被引:5,自引:0,他引:5
华北克拉通中部广泛发育中元古代镁铁质岩墙群。这些岩墙群未变形和未变质,侵位于先存破裂中,成为恢复华北克拉通中部中元古代构造应力场的显著标志。克拉通北部地块的镁铁质岩墙群为张剪性,而中部和南部地块为张性。根据华北克拉通中部中元古代镁铁质岩墙群的分布和成因机制分析,来恢复模拟中元古代的构造应力场。数值模拟结果表明镁铁质岩墙群在中元古代形成于伸展的大地构造背景,与横穿华北克拉通中部的燕辽-中条拗拉槽系的伸展作用有一定的联系。 相似文献
12.
谭少华 《西南科技大学学报》1998,(1)
本文采用构造解析法,查明中条群地层经历了五期构造变形的叠加改造。重建了篦子沟组的层序。认为胡—篦型铜矿床为构造控制的热液矿床 相似文献
13.
渤海湾盆地形成机制研究 总被引:65,自引:7,他引:65
侯贵廷 《北京大学学报(自然科学版)》1998,34(4):503-509
从渤海湾盆的几何形态,盆地边界的走滑构造和内部的伸展构造分析,结合盆地的沉积特征和沉部地质特征的研究,提出渤涨湾盆地的拉造成因模式。 相似文献
14.
Zircon SHRIMP geochronology and geochemistry of TTG rocks in Sushui Complex from Zhongtiao Mountains with its geological implications 总被引:4,自引:0,他引:4
The tonalite-trondhjemite-granodiorite (TTG) rocks in Sushui Complex of Zhongtiao Block can be divided into two series according to their zircon U-Pb ages and geochemical characteristics: one is subduction-related (SR) and the other collision-related (CR). The SR TTG rocks, together with other Late Archean island arc magmatism, were developed as a result of oceanic subduction between the Eastern and Western blocks in Late Archean; while the CR TTG rocks formed in a thickened crustal environment, which was responding to the collision between the Eastern and Western blocks in Paleoproterozoic. All these features support a model that the Zhongtiao Block is a part of the Trans-North China Orogen in the middle of North China Craton. 相似文献