秦岭南缘勉略构造带小碥河—长坝地区变质地层碎屑锆石U-Pb年龄及地质意义

李荣; 裴先治; 李佐臣; 裴磊; 刘成军; 高峰

doi:10.19751/j.cnki.61-1149/p.2020.02.007

秦岭南缘勉略构造带小碥河—长坝地区变质地层碎屑锆石U-Pb年龄及地质意义

李荣¹,
裴先治^1,2, ,,
李佐臣^1,2,
裴磊^1,2,
刘成军^1,2,
高峰^1,2

1. 长安大学地球科学与资源学院, 陕西西安 710054;
2. 西部矿产资源与地质工程教育部重点实验室, 自然资源部岩浆作用成矿与找矿重点实验室, 陕西西安 710054

基金项目:

国家自然科学基金项目“扬子地块西北缘碧口群构造属性及与Rodinia超大陆聚合-裂解关系”（41872233）和“秦岭-祁连结合部位早古生代晚期岩浆事件及其对构造演化的启示”（41872235），陕西省自然科学基金面上项目“勉略宁地区中新元古代中酸性侵入岩构造属性研究”（2019JM-312），中央高校基本科研业务费资助项目（300102279108）

详细信息

作者简介:
李荣(1994-),男,长安大学地质学专业硕士研究生。E-mail:1084525924@qq.com

通讯作者:
裴先治(1963-),男,教授,博士生导师,从事构造地质学和区域地质学研究。E-mail:peixzh@chd.edu.cn

中图分类号: P597
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出版历程
- 收稿日期: 2019-05-30
- 修回日期: 2019-07-18
- 网络出版日期: 2022-07-28
- 发布日期: 2020-06-04

Detrital Zircon U-Pb Age and Geological Significance of Metamorphic Strata from Xiaobianhe-Changba Area in the Mianlue Tectonic Belt of Southern Qinling

LI Rong¹,
PEI Xianzhi^1,2, ,,
LI Zuochen^1,2,
PEI Lei^1,2,
LIU Chenjun^1,2,
GAO Feng^1,2

1. School of Earth Science and Resources, Chang'an University, Xi'an 710054, Shaanxi, China;
2. Key Laboratory of Western Mineral Resources and Geological Engineering, Ministry of Education, Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, MNR, Xi'an 710054, Shaanxi, China

摘要

摘要: 南秦岭勉略构造带小碥河-长坝地区发育一套时代有争议的低角闪岩相变质沉积地层。由于该变质沉积地层受到了强烈变质和变形作用的改造，且缺少精确的年代学证据，在以往的地质研究和地质图中将其形成时代划归为古元古代、早古生代、志留纪-三叠纪、泥盆纪、泥盆纪-石炭纪等。笔者以该区的变质碎屑岩为研究对象，进行LA-ICP-MS锆石U-Pb年代学研究，完成锆石测点一个样品共计80个，获得小碥河-长坝地区的变质地层主要碎屑锆石年龄为850~658 Ma，最小年龄加权平均值为（576.5±12.4）Ma。结合前人资料，认为小碥河-长坝地区变质地层的沉积时代主体应为早古生代；物源主要来自勉略构造带内部火山岩、碧口微地块及扬子地块西北缘新元古代岩浆岩；其沉积事件对应了勉略构造带及扬子地块西北缘地区早古生代伸展裂陷沉积过程。
- 南秦岭 /
- 勉略构造带 /
- 碎屑锆石 /
- 变质沉积地层 /
- LA-ICP-MS锆石U-Pb定年
Abstract: A set of low-amphibolite facies metasedimentary stratum with the age undetermined is exposed in the Xiaobianhe-Changba area,Mianlue tectonic belt of the South Qinling orogeny. The formation of the era was classified as Paleoproterozoic,Early Paleozoic,Silurian-Triassic,Devonian etc, due to the long-standing controversy over its formation and the lack of accurate chronological evidence. In this paper, the study of LA-ICP-MS zircon U-Pb chronology of metamorphic clastic rocks is carried out on the metamorphic clastic rocks in this area, and a sample of zircon measuring points is completed with a total of 80 points. The metamorphism is obtained in the Xiaobianhe-Changba area, in which the minimum age-weighted average of metamorphic stratigraphic units in Xiaobianhe-Changba area is 576.5+12.4 Ma, and the age of main clastic zircon ages is between 850 Ma and 658 Ma. Based on the previous data,it is considered that the sedimentary age of metamorphic stratigraphic units should be Early Paleozoic in Xiaobianhe-Changba area;the provenances mainly come from the volcanic rocks in the Mianlue tectonic belt, the Neoproterozoic magmatic rocks in Bikou block in the northwestern margin of the Yangtze block;their sedimentary events correspond to the Early Paleozoic sedimentary process of the extensional rifting in Mianlue tectonic belt and the northwestern margin of the Yangtze block.
- Southern Qinling /
- Mianlue Tectonic Belt /
- Detrial Zircns /
- Metasedimentary stratum /
- LA-ICP-MS Zircon U-Pb Dating

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