| 张德明,何良伦,曾广乾,杨坤光,戴传固,张慧.黔西罐子窑地区叠加变形及其对铅锌矿床的控制作用[J].贵州地质,2014,31(4):241-251 |
| 黔西罐子窑地区叠加变形及其对铅锌矿床的控制作用 |
| Superimposed Deformation and its Controlling Effect on Pb-Zn Deposits of Guanziyao Region in West Guizhou |
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| DOI： |
| 中文关键词: 滑脱作用 叠加变形 铅锌矿床 构造控矿 罐子窑地区 |
| 英文关键词:Detachment Superimposed deformation Pb-Zn deposits Tectonic ore control Guanziyao area |
| 基金项目:贵州省国土资源厅“贵州区域构造特征、构造演化与矿产空间分布关系研究”和贵州省地矿局“贵州普安罐子窑-水城花嘎地区构造变形及其对铅锌矿控制”联合资助。 |
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| 中文摘要: |
| 黔西罐子窑地区位于扬子板块西南缘,自中生代进入板内发展阶段之后,发生了多期次复杂构造叠加变形。第一期变形(早燕山期:J3-K1)以自东向西挤压收缩为主,形成了近南北向的褶皱与断层构造体系,发育褶皱轴面以东倾、断层以向西逆冲滑脱占主导地位的变形特征。中上泥盆统火烘组、榴江组泥灰岩和硅质、钙质粘土岩为重要滑脱面,滑脱层本身变形复杂,其上部褶皱相对平滑开阔而下部褶皱相对紧闭。第二期变形(晚燕山期:K2-E)以自北向南挤压收缩为特点,横跨叠加在早期变形之上,表现为早期近南北向褶皱发生枢纽倾伏、断层发生张剪性活动,伴随多层次向南滑脱,在南部形成了轴面北倾的近东西向褶皱(局部倒转)和向南逆冲的断层,并切割南北向构造,喜山早期使得断裂再次活动与调整。区内铅锌矿体分为两类产出状态,一是顺层平缓产出,明显受顺层滑脱与低角度断层控制；另一类是陡倾产出,受陡倾张剪性断层控制。平缓者多形成于早、晚燕山期,而陡倾者多形成于构造转换期或喜山早期。 |
| 英文摘要: |
| Guanziyao Region is located in the southwest edge of Yangtze Plate, west Guizhou Province. This region experienced several periods of complex superimposed deformation after the stage of intraplate deformation. The first period is characterized by compressive effect trending W-E, from the Late Jurassic to the Early Cretaceous during the Early Yanshanian, resulting in nearly S-N trending systemic structure of folds and faults, among which east-dipped axial planes and westwards thrusting faults are predominated. Main detachment surface characterized by marlstone and calcian argillite in middle-upper Devonian Huohong Formation and Liujiang Formation is complexly distorted by relatively smooth open fold above and tight fold beneath. The second period is characterized by compressive effect trending N-S in the Middle Cretaceous during the Late Yanshanian. This deformation, superimposing on the earlier one, is presented by hinge plunging in the earlier nearly S-N trending folds and extensional shearing activities in faults. Due to several episodes of Southwards detachments, N-dipped axial planes of nearly E-W trending folds with partial inversion and Southwards thrusting faults were developed in the South. These faults were reactive in Early Himalayn period. Structures in the outcrops indicate the E-W structure cuts the S-N structure. Ore bodies of Pb-Zn mine in the study area have two kinds of output. One is flat bedding output forming in early and late Yanshanian, obviously controlled by bedding detachments and low-angle faults, whereas the other is steep outcrop forming in structural transition periods or in Early Himalayn period, controlled by steep extensional and shearing faults. |
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