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玲珑花岗岩位于前寒武纪鲁东地盾胶东隆起区,出露面积约3,100km~2,其围岩是以黑云变粒岩、斜长角闪岩为主的太古—早元古代胶东群区域变质岩系,著名的鲁东金矿即赋存于花岗岩体中。以胶东群为主要组成的栖霞复式背斜呈EW向横贯全区,其上发育有一系列NNE向、NE向压扭性断裂、构成了该区基本构造格架(图1)。自1936年冯景兰先生对玲珑花岗岩进行考察至今,该岩体已有47年的研究史。长期以来,围绕玲珑花岗岩成因问题,争论颇大。由于该岩体与鲁东金矿的密切空间关系,上述问题的研究显得极为重要。本文试图在作者1980、1981年对岩体北段(主要是玲珑—九曲一带)所作的两次地质调查的基础上,通过地质、岩石、岩石化学及稀土元素地球化学等方面的初步研究,提出玲珑花岗岩的成因和演化模式。
Delicate granite is located in the Jiaodong Uplift of the Ludong Formation in the Precambrian. The exposed area is about 3,100km ~ 2. Its surrounding rock is dominated by biotite granulites and amphibolite, and the Archean-Early Proterozoic Jiaodongqu The rock series, the famous Ludong gold deposit, is hosted in the granite body. The Qixia multiple anticlinal anticline, mainly composed of Jiaodong Group, traverses EW across the whole area. There are a series of NNE-trending and NE-trending compressive-torsional fractures forming the basic tectonic framework of the area (Fig. 1). Since 1936 Mr. Feng Jinglan exquisite granite inspection has so far, the rock has 47 years of research history. For a long time, around the causes of exquisite granite, the debate is quite large. Due to the close spatial relationship between the rock mass and Ludong gold deposit, the above problems are of great importance. Based on the two geological surveys made by the authors in 1980 and 1981 on the northern segment of the rock mass (mainly Linglong-Jiuqu area), this paper attempts to make a preliminary study on geochemistry, geochemistry, rock chemistry and rare earth element geochemistry, Put forward the origin and evolution pattern of exquisite granite.