基于三维模型的西峪金伯利岩管与断裂构造关系探讨

A discussion on the relationship between Xiyu kimberlite pipe and regional tectonic characteristics

山东蒙阴金刚石矿床是中国著名的金伯利岩型金刚石矿床,西峪金伯利岩管是山东蒙阴地区的典型代表。三维建模技术于近些年来被广泛应用于地学研究领域。本文选择山东蒙阴地区西峪金伯利岩管为研究对象,借助于三维建模技术构建金伯利岩管和断裂构造的三维实体模型,在岩管成矿地质背景分析基础上,开展断裂构造三维空间特征定量分析和三维模型叠合讨论,探讨西峪金伯利岩管与断裂构造特征的关系。结果表明:金伯利岩管呈现出连续的上大下小"放射状"空间形态特征,岩管赋存部位往往断裂构造密集;金伯利岩岩浆上涌的通道可能为F1、F2、F10等深大断裂,岩管分布于断裂交点旁侧,岩管形态与构造交点形态相似。

The Mengyin diamond deposit in the Shandong Province is a well-known kimberlite type diamond deposit in China of which the Xiyu kimberlite pipe is a typical representative. In recent years, the three-dimensional modeling technology has been applied in the field of geoscience research. In this paper, the Xiyu kimberlite pipe is selected as the research object. A three-dimensional kimberlite pipe model and the three-dimensional fault structural model were constructed based on the three-dimensional modeling technology. Subsequent to the analysis of geological background of rock pipe mineralization and a quantitative analysis of three-dimensional spatial characteristics of fault structure, a discussion of three-dimensional model superposition is undertaken to examine the relationship between the Xiyu kimberlite pipe and the structural fault characteristics. The kimberlite pipe shows a continuous "radial" spatial morphology with an expanding upper part and a narrowing lower part. The rock pipes often have dense faulted structures. The upwelling channel of kimberley rock magma may be F1, F2, F10 and other deep faults. The rock pipes are distributed on the side of the fault intersection. The morphology of kimberlite pipe and structural intersection is very similar.