EXPERIMENTAL STUDY ON THE GENESIS OF INTRUSIVE ROCKS IN THE TONGLING AREA, ANHUI
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摘要: 通过宏观、微观变形构造的研究，以及对平衡剖面技术、有限应变测量等方法的系统应用，详细论述了凭祥逆冲推覆构造是在北西—南东向挤压应力作用下于地台盖层中形成的浅层次大型叠瓦状逆冲推覆构造。长度大于３０ｋｍ，总体走向２５～４０°，断面倾向南东，倾角２０～３０°，逆冲方向３０７°，分带特征明显。经平衡剖面计算，其短缩率ｅ＝－３３．３％，相对长度比εｒ＝６６．７％，推覆距离大于５６２５ｍ，最大主应力为北西—南东向，形成时期为印支—燕山期。Abstract: Through 37 petrogenetic experiments the authors came to the following conclusions: （1） quartz dioritic or more basic magma cannot be produced by anataxis of crustal materials at crustal temperatures;（2） quartz dioritic and granodioritic magmas can result from assimilation of granitic crust by alkali basaltic magma. The resulting magma is high potassium and alkali rich, and the rocks belong to high potassium rock series,being similar to intrusive rocks of the Tongling area;（3）the magma generated at high pressures is richer in potassium and alkalis than that generated at medium pressures;（4）in the process of magmatic evolution ,there seems no genetic relation between Cu and K,and the “correlativity"of both is related to their convergence,i.e.they both concentrate in the late magmatic stage.
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Keywords:
- petrogenetic experiment /
- intrusive rocks /
- Tongling of Anhui
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