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塘坝子葛仙山碳酸盐岩外来体中各种岩溶形态十分丰富。通过对岩溶形态特征的总结和岩溶与地层、构造关系的分析,讨论了外来体的成因,认为外来体是构造作用形成的飞来峰。 相似文献
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江南古陆的构造属性讨论——以湖南马底驿地区板溪群为例 总被引:5,自引:1,他引:4
以湖南马底驿地区1:5万区调和专题研究资料为基础,指出板溪群岩石(包括其下伏的冷家溪群)不是构造杂岩,而是前震旦系正常的地层序列,江南古陆最终形成于加里东运动,晚古生代沉积古陆控制;华南具有双层基底,在浅变质褶皱基底之下有深度变质结晶基底,在整个江南古陆没有巨大外来体的明显证据,并得到地球物理资料的支持。 相似文献
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通过对金沙江西南某水电站库首区1:2000地质测绘和1:200平硐编录,对库区的罗家坪子外来央体的特征进行了详细的研究,认为其总体特征是较老的阳新炭岩呈外来的岩片状覆盖于时代较新的玄武岩之上,呈现为“类飞来峰”构造。平面上,呈一不规则的三角形;剖面上,呈叠瓦状。在此基础上,对其成因机制进行分析,认为罗家坪子外来岩体是由逆冲推覆构造所形成的。该逆冲推覆构造前缘逆冲形成叠瓦,中部波状起伏,后部下插地下深处。通过进一步研究分析,认为罗家坪子外来岩体是稳定的。 相似文献
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M. J. Bartholomew 《Geological Journal》1983,18(3):241-253
Examinations of Grenville massifs in the Blue Ridge Geologic Province of Virginia and North Carolina indicate that the country rocks (∼ 1100–1450 Ma) are layered gneisses that were metamorphosed during Grenville orogenesis (∼ 1000–1100 Ma) to amphibolite to granulite facies and intruded by plutonic suites. Subsequently, the Grenville terrane was intruded by a suite of peralkaline granitic plutons (∼ 700 Ma) and progressively overlapped westward by Upper Precambrian to Cambrian sedimentary and volcanic rocks. Following deposition of Upper Precambrian and Palaeozoic rocks, the Blue Ridge Geologic Province was subjected to Taconic metamorphism (∼ 450–480 Ma) which generally increased in intensity southeastward from greenschist (chlorite grade) to upper amphibolite (sillimanite grade) facies. Large-scale late Devonian thrusting (∼ 350 Ma) along the Fries fault system and the Brevard zone-Yadkin fault system produced the present day distribution of juxtaposed Grenville massifs and Palaeozoic metamorphic zones in the Blue Ridge Geologic Province. Palinspastic restoration of the Taconic metamorphic zones to their pre-late Devonian relative positions yields an ∼ 50 km displacement on the Fries fault system near the Grandfather Mountain window and and an ∼ 80 km displacement on the Smith River allochthon farther east. Restoration of the Grenville massifs to this same palinspastic base shows that Grenville metamorphic grade decreased southeastward from the deeper granulite facies (opx + gar) to the shallower granulite facies (opx ± amp) to amphibolite facies. 相似文献
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