西藏定结、定日一带上石炭统纳兴组重力流沉积及其地质意义

张雄华; 李德威; 袁晏明; 曹树钊

西藏定结、定日一带上石炭统纳兴组重力流沉积及其地质意义

中国地质大学地球科学学院, 湖北武汉 430074

基金项目:

中国地质调查局"1∶25万定结幅、陈塘区幅(国内部分) 区域地质调查"项目 20001300009231

详细信息

作者简介:
张雄华（1963-），副教授，1984年毕业于武汉地质学院，主要从事古生物地层学、沉积学的教学和科研工作

中图分类号: P53
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出版历程
- 收稿日期: 2003-05-15
- 刊出日期: 2003-11-25

Gravity Flow Deposit in Naxing Formation of Upper Carboniferous in Dingjie and Dingri, Tibet, and Their Geological Significances

Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China

摘要

摘要: 西藏定结、定日一带上石炭统纳兴组为一套厚度巨大的陆源碎屑沉积, 该组中部首次识别出重力流沉积.重力流沉积可划分为3个类型: 崩塌沉积、碎屑流沉积和浊流沉积, 以碎屑流沉积常见.通过沉积相和基于沉积物组分及地球化学方面的物源分析, 判断该区晚石炭世存在小型洼陷盆地, 其形成与晚石炭世海西伸展运动有关, 纳兴组重力流沉积与下伏滨浅海沉积之间具一伸展不整合.
- 上石炭统 /
- 重力流沉积 /
- 西藏
Abstract: Naxing Formation of Upper Carboniferous in Dingri and Dingjie, Tibet, is a terrigeneous clastic deposit with huge thickness. Gravity flow facies including collapse, debris flow and turbite facies are distinguished firstly in the middle part of the formation. The sedimentary facies and source analysis based on sediment composition and geochemical characteristics reveals that the environment of the area in Late Carboniferous used to be a small fault basin related with the Hercynian extensional movement, and that an extensional unconformity is situated between the gravity flow facies and shore-shelf facies in the lower part of Naxing Formation.
- Upper Carboniferous /
- gravity flow deposit /
- Tibet

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图 1 石炭系纳兴组沉积序列

1.楔状交错层理；2.水平层理；3.生物扰动构造；4.潜穴；5.侵蚀构造；6.滑塌构造；7.海侵体系域；8.高水平体系域；9.层序界面；10. 最大海泛面；11.崩积岩；12.含砾杂砂岩、杂砂岩；13.石英砂岩；14.砂岩；15.含砾砂质泥岩；16.泥质粉砂岩；17.页岩

Fig. 1. Stratigraphical sequences and sedimentary facies of Naxing Formation

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图 2 纳兴组碎屑流砂岩概率累积曲线

Fig. 2. Cumulative curves of the debris flow sandstone of Naxing Formation

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图 3 纳兴组碎屑流、浊流砂岩CM图

Fig. 3. CM pattern of the debris flow and turbidite sandstone of Naxing Formation

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图 4 纳兴组砂岩的w（SiO₂）－ w（K₂O）/w（Na₂O）构造环境判别^[8]

OLA.大洋岛弧；ACM.活动大陆边缘；PM.被动大陆边缘

Fig. 4. Plate tectonics setting of the sandstone of Naxing Formation using w(SiO₂)-w(K₂O)/w(Na₂O)^[8]

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