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前言秦岭东段豫南桐柏北部,相当于加里东期的一套中压变质相系变质岩石(326—410百万年)中,有一系列燕山晚期(130—134百万年)的煌斑岩脉群分布,其中既有钙碱性煌斑岩(云煌岩、云斜煌岩、闪斜煌斑岩和云闪正煌岩),也有碱性煌斑岩(斜闪煌斑岩、碱闪煌斑岩和碱煌岩)。这两类煌斑岩不但共生在一起,而且成分上是过渡的。不仅如此,甚至有些煌斑岩还通过半煌斑岩与正长岩类相过渡。这表明钙碱性煌斑岩和碱性煌斑岩以及正长岩类之间在形成上可能是密切相关的,或者都是由相同的同种岩桨在不同的条件下派生形成的。这由它们自身的主要化学成分和微量元素成分特征可以清楚的表现出来。并且煌斑岩和正长岩类侵入体中有相同的混合花岗岩捕虏体和石英捕虏晶,这表明二者都曾有过同化混染作用。
Foreword A series of metaphyseal metamorphic rocks (326-410 million years) in the eastern part of the Qinling Mountains to the north of Tongbai in the south of Henan Province correspond to a series of lamprophyretic veins of the late Yanshanian period (130-134 million years) Group distribution, in which there are both calc-alkaline lamprophyre (Yunhuang rock, Yunhuanghuang rock, blinking lamprophyre and Yunxianzhuanghuang rock), there are alkaline lamprophyre Lamprophyre and ametrine). These two types of lamprophyre not only symbiotic together, but also the composition of the transition. Not only that, some even lamprophyra also through half-lamprophyres and syenite phase transition. This suggests that calc-alkaline lamprophytes may be closely related to the formation of alkaline lamprophyres and normal-type rocks, or they may all be derived from the same in-breed rock under different conditions. This is clearly demonstrated by their own major chemical and trace element compositional characteristics. The same mixed granite xenoliths and quartz xenocrysts are present in the lamprophyre and syenite intrusions, indicating that both have had assimilation and contamination.