| 长江中下游地区新华夏构造体系的“米字型”结构特征 |
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| 引用本文： | 吕古贤,张宝林,吕承训,胡宝群,曾勇,郭涛,申玉科,王红才,马立成,焦建刚,毕珉烽.长江中下游地区新华夏构造体系的“米字型”结构特征[J].现代地质,2021,35(5):1240-1250. |
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| 作者姓名： | 吕古贤 张宝林 吕承训 胡宝群 曾勇 郭涛 申玉科 王红才 马立成 焦建刚 毕珉烽 |
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| 作者单位： | 1.中国地质科学院地质力学研究所,北京 1000812.中国科学院矿产资源研究重点实验室,中国科学院地质与地球物理研究所,北京 1000293.中国地质调查局发展研究中心,北京 1000374.东华理工大学 地球科学学院,江西 南昌 3300135.中国地质调查局南京地质调查中心,江苏 南京 2100166.长安大学地球科学与资源学院,陕西 西安 7100547.中国地质科学院矿产地质研究所,北京 100037 |
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| 基金项目： | 山东黄金矿业(玲珑)有限公司科研项目(LLYY-2019-001);中国地质调查局项目(121201081305);国土资源部科技发展计划项目(2002201);国家计委科技找矿项目(GJ9471110);国家科委基础研究特别支持项目(94-83);中国地质调查局项目(20023046);国家攀登项目(G1999043214);国家攀登项目(95-39(预)-6-3) |
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| 摘 要： | 构造体系由强变形构造带和弱变形地域共同构成,这些构造带和变形带可以用结构面的形式表达。构造体系结构面的分布分析,更加适用于变形规律研究,便于追索构造应力场及其演化。以长江中下游地质结构与导矿-控矿要素研究为基础,总结了新华夏构造体系结构面的“米字型”分布特征。新华夏系“米字型”构造,由NNE 25°方向挤压断裂和褶皱带、NNW 345°方向(大义山式)张扭断裂、NEE 75°方向(泰山式)压扭构造和NWW 300°方向(长江式)的横张构造组成。其演化分先后三个阶段;NNW 345°方向—NEE 75°方向的共轭剪切构造阶段、NNE 25°方向挤压构造阶段和NWW 300°方向的张性剪切构造阶段。新华夏构造体系的“米字型”构造样式的识别,为研究构造体系的应力-应变成因、探讨构造体系的形成演化以及浅部构造和深部构造相关性研究提供了重要的地质构造基础。在其它类型的构造体系中,结构面也具有“米字型”分布特征。
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| 关 键 词： | 长江中下游地区 新华夏构造体系 结构面的“米字型”分布 剪-压-张构造演化 |
| 收稿时间： | 2020-03-20 |
| 修稿时间： | 2020-07-24 |
Characteristics of Double-cross Structure in Neo-Cathaysian Structural System in the Middle-Lower Yangtze River Valley Region |
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| LÜ,Guxian,ZHANG Baolin,LÜ,Chengxun,HU Baoqun,ZENG Yong,GUO Tao,SHEN Yuke,WANG Hongcai,MA Licheng,JIAO Jiangang,BI Minfeng.Characteristics of Double-cross Structure in Neo-Cathaysian Structural System in the Middle-Lower Yangtze River Valley Region[J].Geoscience——Journal of Graduate School,China University of Geosciences,2021,35(5):1240-1250. |
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| Authors: | LÜ Guxian ZHANG Baolin LÜ Chengxun HU Baoqun ZENG Yong GUO Tao SHEN Yuke WANG Hongcai MA Licheng JIAO Jiangang BI Minfeng |
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| Abstract: | The tectonic system is composed of strongly-deformed structural belts and weakly-deformed region. These structural belts and blocks can be expressed in the form of structural planes. Structural plane analysis of the structural system is suitable for the study on the deformation rules, and it facilitates the tracing of structural stress field and evolution. Based on the study of the geological structures and the ore-forming/-controlling elements in the Middle-Lower Yangtze River Valley region, we summarized the distribution features of double-cross planes of the Neo-Cathaysian structural system. The double-cross structures of the Neo-Cathaysian structural system is composed of NNE-trending (25°) compressional fracture and fold belt, NNW-trending (345°, Dayishan-type) tension-torsional fractures, NEE-trending (75°, Taishan-type) compression-torsional structures, and NWW-trending (300°, Yangtze River-type) transverse extension structures. It contains three evolution stages: (1) the NNW 345° to NEE 75°-trending conjugate shear stage, (2) the NNE 25°-trending extrusion stage, and (3) the WWN 300°-trending tensile shear stage. Identification of the double-cross structural style of the Neo-Cathaysian structural system provides an important geological structural basis for the stress-strain genesis study, for the structural system formation and evolution, and for correlating shallow and deep structures. In addition, the structural planes have double-cross distribution features in other types of structural systems. |
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| Keywords: | Middle-Lower Yangtze River Valley Neo-Cathaysian structural system double-cross structure surface shear-compression-tension tectonic evolution |
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