岩石矿物学杂志2025，Vol.44Issue(6)：1302-1324,23.DOI:10.20086/j.cnki.yskw.2025.4146
塔北阿满过渡带二叠纪辉绿岩侵入体形成时代、空间展布及侵位机制分析
Formation time,spatial distribution and emplacement model of the Permian diorite intrusions in the Awati-Manjar transition zone of the northern Tarim Basin
摘要
Abstract
In the Awati-Manjar transition zone of northern Tarim Basin,the Ordovician sedimentary sequence is characterized by the presence of extensive diabase intrusions.These igneous intrusions are not only key evidence for the magmatic activity process of the Tarim Large Igneous Province,but also closely related to oil and gas migration and accumulation,providing guidance for oil and gas exploration.Based on seismic profiles and drilling data analy-sis,combined with isotopic dating methods,this study systematically studies the diabase intrusions in the Awati-Manjar transition zone,revealing their formation time and spatial distribution characteristics,and discussing their emplacement mechanism.The results show that the diabase intrusions can be divided into two types:steeply dip-ping intrusions and layered intrusions.Steeply dipping intrusions generally unconformably intrude into the Sangtamu Formation and are concentrated in the YM,GL,and MS drilling areas,as well as the AM and AM north drilling ar-eas.Layered intrusions intrude conformably into the top of the Yijianfang Formation,Tumuxiuke Formation,and Lianglitage Formation and are concentrated in the MS and FY drilling areas,with small-scale distribution in the YM west,GL,and AM north.Steeply dipping and layered diabase intrusions can exist independently,but in most ca-ses,they are closely connected in three-dimensional space,forming symmetrical or asymmetrical disc-shaped intru-sions.Zircon U-Pb isotopic dating results indicate that the diabase intrusions crystallized between 303～285 Ma,and can be further divided into two stages.The intrusions of first stage are limited in distribution.They occurred a-round 303 Ma,corresponding to the first phase of magmatism in the Tarim Large Igneous Province.The intrusions of second stage,as the majority of the diabase in the study area,occurred around 285 Ma,corresponding to the third phase of magmatism in the Tarim Large Igneous Province.The diabase intrusions are composed of feeding veins,internal beds,inclined veins,and external beds from bottom to top,which make up of a vertically related intrusive system.The top of the Middle and Lower Ordovician serves as an important structural transition surface and lithological interface,controlling the lateral intrusion and expansion of the magmas.Meanwhile,the planar dis-tribution features are jointly controlled by the mantle plume activity,the regional stress field evolution and the base-ment structure feature.关键词
辉绿岩/侵位机制/二叠纪/阿满过渡带/塔里木盆地Key words
diabase/intrusion model/Permian/Awati-Manjar transition zone/Tarim Basin分类
天文与地球科学引用本文复制引用
张银涛,许永忠,赵海涛,康鹏飞,徐梦佳,马应龙,杨美纯,陆鹿..塔北阿满过渡带二叠纪辉绿岩侵入体形成时代、空间展布及侵位机制分析[J].岩石矿物学杂志,2025,44(6):1302-1324,23.基金项目
地球深部探测与矿产资源勘查国家科技重大专项(2024ZD1004201) （2024ZD1004201）
中国矿业大学中央高校基本科研业务费项目(2024QN11023) （2024QN11023）
中石油塔里木油田公司横向委托项目(041022070109) DeepEarth Probe and Mineral Resources Exploration—National Science and Technology Major Pro-ject(2024ZD1004201) （041022070109）
Fundamental Research Funds for the Central Universities(2024QN11023) （2024QN11023）
Technology Development Project from PetroChina Tarim Oilfield Company(041022070109) （041022070109）
