破裂带中几个问题

为什么要研究破裂带破裂带是地球表面常见到的现象,通常所说的断裂带,也就是破裂带。那么,断裂带和破裂带是不是等同呢?可以说又等同,又不等同。所说等同,就是都表示地壳岩石发生破裂。但又不等同,就是断裂带往往反映出明显的性质,如张性断裂、扭性断裂等是。

ON FRACTURE ZONES

Fractures, caused by stress, vary in size, ranging from microscopical traces to tens of kilometers wide in some tectonic belts. Physically, they are well known, but chemically still remain to be investigated.The real nature of "optical anomalies" is an essential feature of photoelasticity. However, its significance to geology, so far as the writer’s knowledge goes, is far from clear.Some features, so called as "impact metamorphism", have been found also in fracture zones. It is known to be interrelated. Facies series as well as its parity, between which there is a belt of mylonite, widely distributed, but their nature remain less obvious, especially in relation with the blueschist and tectonic inclusions. As for glaucophane, it has been observed in some minor shear fractures, as in Hengshan granodiorite body and others, strongly suggesting that blueschist might be really caused bv shearing stress.