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西藏双湖托纳木地区上侏罗统雪山组物源分析
引用本文:金玮,王成善,李亚林.西藏双湖托纳木地区上侏罗统雪山组物源分析[J].大地构造与成矿学,2006,30(4):519-526.
作者姓名:金玮  王成善  李亚林
作者单位:1. 成都理工大学沉积地质研究院,四川,成都,610059
2. 中国地质大学,北京,100083
基金项目:本文受“羌塘盆地托纳木区块1:5万石油构造详查与化探”(编号:科油[2004]02号)项目资助.承蒙两位评审专家提出宝贵的修改意见,借此表示诚挚的谢忱!参加野外工作的还有陶晓风教授、赵兵教授、马润则教授、伍新和博士等,在此一并表示感谢!
摘    要:地处羌北坳陷与中央隆起带毗连地带的托纳木地区广泛发育上侏罗统雪山组沉积,厚达1500m。本文重点研究了雪山组的地层特征、古水流特征以及砂岩碎屑组分特征,在此基础上简单分析了其沉积相特征。根据雪山组的岩性及沉积构造将雪山组划分为三段,其沉积相分别为雪山组一段为前三角洲亚相,二段为三角洲前缘亚相和三角洲平原亚相组合,三段为冲积扇相。古水流复平方向分布样式指示雪山期的物源方向主要来自西南边;砂岩碎屑组分表明雪山组的母源区岩性十分多样;三角图解定量分析显示物源区基本上属于再旋回造山带,而且以石英再旋回为主,表明其物源来自于西南部的中央隆起带。

关 键 词:托纳木地区  雪山组  地层特征  沉积相  古水流  砂岩碎屑组分  中央隆起带
文章编号:1001-1552(2006)04-0519-08
收稿时间:2005-10-13
修稿时间:2006-03-15

PROVENANCE ANALYSIS OF THE LATE JURASSIC XUESHAN FORMATION IN SHUANGHU TUONAMU REGION, QIANGTANG BASIN, TIBET
JIN Wei,WANG Chengshan,LI Yalin.PROVENANCE ANALYSIS OF THE LATE JURASSIC XUESHAN FORMATION IN SHUANGHU TUONAMU REGION, QIANGTANG BASIN, TIBET[J].Geotectonica et Metallogenia,2006,30(4):519-526.
Authors:JIN Wei  WANG Chengshan  LI Yalin
Institution:1. Institute of Sedimentary Geology of Chengdu University of Technology, Chengdu, SC 610059, China ; 2. China University of Geoscience, Beijing 100083, China
Abstract:Shuanghu Tuonamu region is situated between the Central Uplift Zone and the Northern Qiangtang depression, where the Late Jurassic Xueshan Formation develops extensively with a thickness amounting to 1500m.This paper aims to analyze the stratigraphic and petrological characteristics, the palaeocurrent, and the clastic compositions of Xueshan Formation. The vertical structure of Xueshan Formation is comprised of three sedimentary assemblages. As both delta and alluvial fan sedimentary facies are developed in Xueshan Formation, we can see that the prodelta subfacies is developed in the first member, the delta front and delta plain subfacies are developed in the second member, and the alluvial fan facies is developed within the third member. The results concerning the paleocurrent's complex plane direction style suggests that the provenance of Xueshan Formation comes from the southwest side, and that the lithologic characteristics of the source rocks for Xueshan Formation vary greatly. A quantitative analysis of the clastic compositions of sandstone by using the Dikinson triplot displays that the tectonic background for Xueshan Formation is derived from a parent source controlled by recycled orogen and characterized by recycled quartz, which helps explain that the provenance of Xueshan Formation comes from the southwest of the Central Uplifting Zone.
Keywords:Tuonamu region  Xueshan Formation  stratigraphic characteristics  sedimentary facies  palaeocurrent  clastic composition  Central Uplifting Zone
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