贵州漾头陡山沱组与留茶坡组界线凝灰岩的锆石U-Pb年龄及其地质意义

陈灿; 冯庆来; 甘正勤

doi:10.3799/dqkx.2019.103

贵州漾头陡山沱组与留茶坡组界线凝灰岩的锆石U-Pb年龄及其地质意义

doi: 10.3799/dqkx.2019.103

陈灿^1, ,,
冯庆来^1,2, , ,,
甘正勤¹

1.
中国地质大学地球科学学院, 湖北武汉 430074
2.
中国地质大学地质过程与矿产资源国家重点实验室, 湖北武汉 430074

基金项目:

国家自然科学基金重点项目 41430101

详细信息

作者简介:
陈灿(1993-), 男, 博士研究生, 主要从事华南埃迪卡拉纪-寒武纪地层学研究

通讯作者:
冯庆来

中图分类号: P534.31
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出版历程
- 收稿日期: 2019-01-11
- 刊出日期: 2020-03-15

Zircon U-Pb Ages and Its Geological Significance of Tuffs between Doushantuo and Liuchapo Formations at Yangtou Section, Guizhou Province

Chen Can^{1
,
,},
Feng Qinglai^{1,2
, ,
,},
Gan Zhengqin¹

1.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China

摘要

摘要: 前寒武纪-寒武纪过渡时期是地质历史上最重要的转折期之一，对这一时期不同沉积相地层建立精确的对比标志，是理解寒武纪动物大爆发等一系列重大地质问题的关键.对贵州漾头剖面陡山沱组顶部和留茶坡组底部的两层凝灰岩中的锆石进行了LA-ICP-MS U-Pb年代学研究，分别获得了554.2±3.3 Ma和550.6±3.3 Ma的加权平均年龄，证明华南扬子地台深水相区留茶坡组开始沉积的时间约为550 Ma.扬子地台在埃迪卡拉纪-寒武纪过渡时期存在明显的台-盆沉积相分异，表明扬子地台在这一时期进入拉张的构造背景；因此，留茶坡组底部550.6±3.3 Ma的绝对年龄代表了扬子地台进入伸展构造背景和强烈海底热液活动开始的时间.另外，凝灰岩锆石微量元素特征显示，两层凝灰岩的源岩均属于花岗岩类，形成的大地构造背景属于岛弧环境或造山环境.
- 扬子地台 /
- 深水盆地 /
- 地层对比 /
- 锆石U-Pb年龄 /
- 地质年代学 /
- 微量元素
Abstract: The Precambrian-Cambrian transition is one of the most important periods in the geological history. Establishing precise stratigraphic correlations among different sedimentary facies lays the foundation for deciphering important geological events including the Cambrian Explosion. LA-ICP-MS U-Pb zircon geochronology was carried out for the two tuffs in the upmost Doushantuo Formation and the basal Liuchapo Formation at the Yangtou section, Guizhou Province in this study. The weighted mean ages of the two tuffs are 554.2±3.3 Ma and 550.6±3.3 Ma, respectively. The new data suggests that the deposition time of the Liuchapo Formation in the deep-water facies of the Yangtze Platform is about 550 Ma. During the Ediacaran-Cambrian transition, the distinct differentiation of deposite facies across the Yangtze Platform indicates that the Yangtze Platform turned into extensional setting during this period. Therefore, the age of 550.6±3.3 Ma at the basal Liuchapo Formation also represents the time when the Yangtze Platform turned into the extensional setting and intense hydrothermal activities. In addition, trace elements of zircons indicate that the two tuffs derived from granite which formed in the magmatic arc or the orogenic environment.
- Yangtze Platform /
- deep-water basin /
- stratigraphy correlation /
- zircon U-Pb age /
- geochronology /
- trace element

HTML全文

图 1 华南扬子地台埃迪卡拉纪-寒武纪过渡时期古地理图（a）、漾头剖面及周边地质简图（b）和漾头剖面地层柱状图（c）

图a修改自Jiang et al.（2011）

Fig. 1. Simplified paleographic map of the South China during the Ediacaran-Cambrian transition(a), geological map of the Yangtou section and surrounding areas (b)and stratigraphic column of the Yangtou section(c)

下载: 全尺寸图片幻灯片

图 2 漾头剖面留茶坡组与陡山沱组界线附近凝灰岩野外及镜下照片

a.样品YT-7野外照片；b.样品YT-9野外照片；c、d.凝灰岩镜下的晶屑凝灰结构（YT-7，正交光）；e.凝灰岩中的长石斑晶（YT-9, 单偏光）；f.凝灰岩中的石英斑晶（YT-9，单偏光）.图c~f中的比例尺为100 μm

Fig. 2. Field and microscopic photos of the tuffs between the Doushantuo and Liuchapo formations at the Yangtou section

下载: 全尺寸图片幻灯片

图 3 漾头剖面留茶坡组与陡山沱组界线附近凝灰岩中部分锆石的阴极发光和透射光照片

红色圆圈代表激光斑束剥蚀位置，直径约32 μm

Fig. 3. Cathodoluminescence and transmission microscope images of zircons from tuffs at the Yangtou section

下载: 全尺寸图片幻灯片

图 4 漾头剖面留茶坡组与陡山沱组界线附近凝灰岩锆石U-Pb谐和图和²⁰⁶Pb/²³⁸U加权平均年龄

Fig. 4. Zircon U-Pb concordia diagrams and ²⁰⁶Pb/²³⁸U weighted average ages of tuffs between the Doushantuo and Liuchapo formations at the Yangtou section

下载: 全尺寸图片幻灯片

图 5 华南埃迪卡拉系-寒武系过渡时期区域地层对比

Fig. 5. Stratigraphy correlation during the Ediacaran-Cambrian interval in South China

下载: 全尺寸图片幻灯片

图 6 漾头剖面凝灰岩锆石微量元素特征判别图

图a、b的底图据Belousova et al.(2002)；图c、d的底图据Yang et al.(2012)

Fig. 6. Zircon trace element plots of tuffs at the Yangtou section

下载: 全尺寸图片幻灯片

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