基于重构造分析资料的雅库特钻石省金伯利岩管道的构造-地球动力学控制

IF 0.8 Q4 GEOCHEMISTRY & GEOPHYSICS

Geodynamics & Tectonophysics Pub Date : 2021-12-15 DOI:10.5800/gt-2021-12-4-0567

S. M. Makeev

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引用次数: 0

摘要

本文介绍了一种基于低频重力异常变形性质的区域重力(1:1 000 000)解释新方法的基本概念。该方法为确定雅库特含金刚石省的构造压缩方向，定位不同运动学的剪切间压缩和伸展的段和轴提供了机会，并在此基础上区分与金伯利岩管道位置空间相关的剪切相互作用带。特别是，整个区域具有四个压迫方向:一对正交方向(方位角为8°的右向和方位角为98°的左向)和一对对角线方向(方位角为38°的右向和方位角为128°的左向)。这些数据与雅库茨克含金刚石省(YDP)地球动力学演化的两个主要阶段(主要是东北挤压第一阶段的右旋和西北挤压第二阶段的左旋)的区域构造物理研究数据相关联，不仅在压缩方向方位角范围内，而且在挤压运动运动学范围内。本文还指出，Alakit-Olenek成矿带是一个广泛(~500 km)的岩石塑性变形区，宽度约为90 km，岩石沿其南北边界的表观运动为右向运动学。成矿带南界呈东北走向连续性，北界呈不连续。Alakit-Olenek成矿带的边界受不同动力学和运动学剪切相互作用带控制，在空间上与金伯利岩管道和金刚石砂矿床有关。研究结果表明，本文提出的重力场解释方法可以预测雅库特含金刚石省金伯利岩岩浆活动地球动力控制构造的产状。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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STRUCTURAL-GEODYNAMIC CONTROL OF KIMBERLITE PIPES OF THE YAKUT DIAMOND PROVINCE ACCORDING TO THE DATA OF GRAVISTRUCTURAL ANALYSIS

The article deals with the fundamental concepts of a new method of interpretation of regional gravimetry (scale 1:1 000 000) based on the idea of the deformational nature of low-frequency gravity anomalies. The method provided an opportunity to identify the direction of tectonic compression in the Yakut diamond-bearing province, to localize segments and axes of inter-shear compression and extension of different kinematics and on that basis to distinguish the shear interaction zones spatially correlating with the location of kimberlite pipes. Particularly, the whole area is characterized by four transpressive compression directions: a pair of orthogonal (dextral with azimuth 8° and sinistral with azimuth 98°) and a pair of diagonal (dextral with azimuth 38° and sinistral with azimuth 128°). These data correlate to those from the regional tectonophysical studies not only within the compression direction azimuths but also within kinematics of transpressive motions for two main phases in geodynamical evolution of the Yakutsk diamond-bearing province (YDP) predominantly dextral for the first phase of the northeastern compression and sinistral for second phase of the northwestern compression. The article also shows that the Alakit-Olenek mineragenic zone is an extensive (~500 km) area of plastic deformation of rocks ~90 km in width with the right-lateral kinematics of apparent motions of the rocks along its northern and southern boundaries. The southern boundary of the mineragenic zone exhibits the northeaststriking continuity whereas its northern boundary is discontinuous. The boundaries of the Alakit-Olenek mineragenic zone are controlled by the zones of shear interaction of different dynamics and kinematics, which are spatially related to kimberlite pipes and diamond placer deposits. The results of this study imply that the method proposed for interpretation of gravity field can predict the occurrence of structures of geodynamic control of kimberlite magmatism of the Yakut diamond-bearing province.

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来源期刊

Geodynamics & Tectonophysics GEOCHEMISTRY & GEOPHYSICS-

CiteScore

1.20

自引率

14.30%

发文量

审稿时长

24 weeks

期刊介绍： The purpose of the journal is facilitating awareness of the international scientific community of new data on geodynamics of continental lithosphere in a wide range of geolchronological data, as well as tectonophysics as an integral part of geodynamics, in which physico-mathematical and structural-geological concepts are applied to deal with topical problems of the evolution of structures and processes taking place simultaneously in the lithosphere. Complex geological and geophysical studies of the Earth tectonosphere have been significantly enhanced in the current decade across the world. As a result, a large number of publications are developed based on thorough analyses of paleo- and modern geodynamic processes with reference to results of properly substantiated physical experiments, field data and tectonophysical calculations. Comprehensive research of that type, followed by consolidation and generalization of research results and conclusions, conforms to the start-of-the-art of the Earth’s sciences.