青海南部二叠纪火山岩Sr、Nd、Pb同位素特征及地质意义

马丽艳; 牛志军; 白云山; 段其发; 王建雄

青海南部二叠纪火山岩Sr、Nd、Pb同位素特征及地质意义

宜昌地质矿产研究所, 湖北宜昌 443003

基金项目:

中国地质调查局项目 200213000003

详细信息

作者简介:
马丽艳(1970-)，女，高级工程师，从事同位素地球化学研究与测试工作．E-mail：ycmliyan@cgs.gov.cn

中图分类号: P597
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出版历程
- 收稿日期: 2006-03-11
- 刊出日期: 2007-01-25

Sr, Nd and Pb Isotopic Geochemistry of Permian Volcanic Rocks fromSouthern Qinghai and Their Geological Significance

Institute of Geology and Mineral Resources, Yichang 443003, China

摘要

摘要: 对青海南部治多-杂多一带二叠纪火山岩进行了全岩Sr、Nd、Pb同位素分析, 样品的I_Sr=0.70333~0.70417, ε_Nd(t) =4.1~5.5, ²⁰⁶Pb/²⁰⁴Pb=17.547~17.986, ²⁰⁷Pb/²⁰⁴Pb=15.476~15.584, ²⁰⁸Pb/²⁰⁴Pb=37.778~37.976.结合岩石学、地球化学研究表明, 该套火山岩为OIB型, 形成于板内伸展拉张的裂谷环境, 属于青藏高原及邻区晚古生代裂谷系统, 原始岩浆可能来自亏损的古软流圈, 裂解机制与古地幔柱活动有关.样品铅同位素的V₁=31.39~46.78, V₂=22.38~42.45, 落入扬子铅同位素省区域, 表明早二叠世青海南部地区具亲扬子性, 揭示出昌都地块在晚古生代属于特提斯区, 为泛华夏陆块群或扬子板块的一个组成部分.
- 二叠纪 /
- 火山岩 /
- Sr、Nd、Pb同位素 /
- 青海
Abstract: Isotopic ratios of Sr, Nd and Pb were analyzed for the Permian volcanic rocks in the Zhiduo and Zaduo areas of southern Qinghai which is located at the Qamdo block. The analytical results of the sample rocks are as follows: I_Sr = 0.703 33 -0.704 17, ε_Nd(t) =4.1-5.5, ²⁰⁶Pb/²⁰⁴Pb=17.547-17.986, ²⁰⁷Pb/²⁰⁴Pb=15.476-15.584, ²⁰⁸Pb/²⁰⁴Pb= 37.778-37.976. Combined with lithological and geochemical research findings, the above results indicate that the volcanic rock is of OIB type and came into formation in the stretching rift tectonic environment. It falls into the Late Palaeozoic rift system of the Qinghai-Tibet Plateau and its adjacent areas. The primitive magma might have originated from the deplected asthenosphere and the continental breakup is related to the activity of mantle plume. With the V₁ and V₂ of the lead isotopic ratios ranging from 31.39 to 46.78, 22.38 to 42.45 respectively, the lead isotope of the rock samples can be labeled the Yangtze lead isotopes, which indicates that the Qamdo block belonged to Tethyan realm during Late Palaeozoic and was a part of the Pan-Cathaysian continental group or Yangtze Plate.
- Permian /
- volcanic rock /
- Sr /
- Nd and Pb isotopes

HTML全文

图 1 研究区地质简图

1.花岗闪长岩; 2.辉绿岩; 3.角度不整合; 4.断层; 5.采样点; 6.研究区; E-Q.古近系-第四系; C1.下石炭统; P1.下二叠统; P1+P2.下、中二叠统(合并); T3.上三叠统; J1-2.下-中侏罗统

Fig. 1. Geological sketch map in studying area

下载: 全尺寸图片幻灯片

图 2 ε_Nd (t) -I_Sr同位素相关图(夏林圻等, 2004)

下载: 全尺寸图片幻灯片

图 3 V₁-V₂相关图(沈上越等, 2001)

Fig. 3. V₁-V₂ correlogram

下载: 全尺寸图片幻灯片

表 1 青海南部二叠纪火山岩Sr、Nd同位素成分分析结果

Table 1. Analytic results of Sr and Nd isotope components from Permian volcanic rocks in southern Qinghai

表 2 青海南部二叠纪火山岩Pb同位素分析结果

Table 2. Analytic results of Pb isotope components from Permian volcanic rocks in southern Qinghai

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