新华夏构造体系地块的多层次"构造隆起-拆离凹陷"特征:大兴安岭造山带例析

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中文摘要：地块形态分为构造带和构造地块两个类别.地块内部的岩石变形强烈且具复杂地质作用的延伸带被称为构造带,往往显示为隆起造山带;而岩石变形微弱、以沉积作用为主且长-宽相近的区域称为构造地块,多数是拆离构造控制的凹陷盆地.构造体系中这种地块"隆起-拆离"构造特征具有普遍意义.本文揭示地块分布显示层次的特点,某个层次的构造地块,可能在更大范围或更高层次被视为构造带,而在更小范围和更低层次表现为低级别的构造带与构造地块组合.本文以大兴安岭造山带为实例,阐述多层次"隆起-拆离凹陷"的地块构造特征.第一层次的新华夏构造体系,是具有海洋板块和大陆板块之间反时钟方向压剪动力成生联系的东亚地区构造形迹组合;中国东部新华夏构造体系发育的,北北东方向的巨型隆起构造带和巨型拆离沉积盆地带属于第二层次;大兴安岭造山带属于第三层次,隆起构造带和沉降凹陷带相间分布;而大兴安岭南段,或者赤峰地区等的"岩浆核杂岩隆起-拆离盆地凹陷带",属于新华夏构造体系的第四层次;第五层次,柴胡栏子金矿田的"中生代花岗杂岩核隆起带-火山岩凹陷带",成为矿田找矿的关键.新华夏构造体系的地块多层次"构造隆起-拆离凹陷带"的特征,可以指导成矿区划单元的确定、成矿规律研究和找矿勘查工作,特别是构造体系五级构造——矿田的地块分布,对于找矿突破具有基础性和指导性的意义.

外文标题：Multi-order Characteristics of the"Tectonic Uplift-Detachment Depression"in Blocks of the Neocathaysian Tectonic System:A Study of the Greater Khinganling Orogenic Belt

外文摘要：Block morphology can be divided into two categories:tectonic belt and tectonic block.The"tectonic belt"refers to an extension belt within a block characterized by strong rock deformation and complex geological processes,and often manifests itself as an uplift orogenic belt.The regions with weak rock deformation,prima-rily characterized by sedimentary processes and similar length and width,are termed tectonic blocks.Most of them are depression basins controlled by detachment structures.In the tectonic system,the block feature of"uplift and detachment"holds universal significance.This paper reveals the hierarchical characteristics of block distribution.Tectonic blocks at a certain level may be considered tectonic belts on a larger scale or at a higher level.Conversely,on a smaller scale or at a lower level,they may be represented as a combination of lower-level tectonic belts and tectonic blocks.Taking the Greater Khinganling orogenic belt as an example,this paper describes a five-order"uplift and disassembly depression"tectonic features of blocks.The first order of the Neocathaysian tectonic system is the Eastern Asian tectonic assemblage,characterized by an anticlockwise compressional shear dynamic relationship between the oceanic and continental plates.In the Neocathaysian tec-tonic system of Eastern China,the NNE-trending giant uplift tectonic belt and the giant detachment sedimentary basin belt represent the second order.The Greater Khinganling orogenic belt is the third-order structure,with alternating uplifted tectonic belts and subsidence depression belts.The southern section of the Greater Khingan-ling Mountains,known as the"magmatic core complex uplift-detachment basin depression belt"in the Chifeng area,belongs to the fourth order of the Neocathaysian tectonic system.At the fifth order,the"Mesozoic gran-ite-complex core uplift belt-volcanic depression belt"in the Chaihulanzi gold field is crucial for orefield prospec-ting.The characteristics of the five-order"tectonic uplift-detachment depression belts"within the Neocathay-sian tectonic system can guide the determination of metallogenic regionalization units,as well as the study of metallogenic patterns and prospecting work.In particular,the distribution of blocks within the orefield,part of the fifth order tectonic system,has fundamental and guiding significance for achieving breakthrough in ore pros-pecting within the key mining belt.

外文关键词：

Neocathaysian tectonic systemdistribution of tectonic uplift-detachment depressionblock hierarchy

作者：

吕古贤、张宝林、焦建刚、王翠芝、毕珉烽、付旭、吕承训、马立成

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作者单位：

中国地质科学院地质力学研究所,北京 100081

中国科学院地质与地球物理研究所,北京 100029

长安大学地球科学与资源学院,陕西西安 710064

福州大学紫金地质与矿业学院,福建福州 350108

中国地质科学院矿产资源研究所,北京 100037

内蒙古地质勘查有限责任公司,内蒙古呼和浩特 010010

中国地质调查局发展研究中心,北京 100037

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关键词：

新华夏构造体系构造隆起-拆离凹陷分布地块层次

基金：

内蒙古自治区地质勘查基金管理中心地质勘查项目国家计委科技找矿项目国家科委攀登计划项目国家科委攀登计划项目国家科委基础研究司特别支持项目国家自然科学基金项目

项目编号：

2019-KY02JG947110G199904321495-39预-6-3GJ94-8340972061

出版年：

2024

DOI：

10.19657/j.geoscience.1000-8527.2024.082

现代地质

中国地质大学（北京）

现代地质

CSTPCD北大核心

影响因子：1.2

ISSN：1000-8527

年,卷(期)：2024.38(4)

参考文献量26