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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第29卷

期数:

2007年第02期

页码:

126-129

栏目:

基础地质与矿产地质

出版日期:

2007-06-15

文章信息/Info

Title:

Sr Isotopic Characteristics of Carbonate Rocks in Xinduqiao Formation of Xikang Group,Western Sichuan,China

作者:

曾宜君¹; 2; 黄思静¹; 易同富²; 郝雪峰²; 熊昌利²; 胡作维¹

1.成都理工大学油气藏地质及开发工程国家重点实验室,四川成都610059;2.四川省地质调查院,四川成都610081

Author(s):

ZENG Yi-jun¹; 2; HUANG Si-jing¹; YI Tong-fu² HAO Xue-feng²; XIONG Chang-li²; H U Zuo-wei¹

1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, Sichuan, China; 2. Sichuan Institute of Geological Survey, Chengdu 610081, Sichuan, China

关键词:

四川西部; 三叠系; 西康群; 锶同位素; 地层学

Keywords:

western Sichuan;  Triassic System;  Xikang Group;  Sr isotope;  stratigraphy

分类号:

P53

DOI:

-

文献标志码:

A

摘要:

四川西部松潘—甘孜地区广泛分布一套三叠系黑色砂板岩层系,由于其岩性单调、古生物化石贫乏,给该 区地层划分、对比带来极大困难。因此,从锶同位素地层学基本原理出发,对甘孜北部西康群新都桥组中薄层状 灰岩样品进行了锶同位素组成测定。结果表明,6件样品的N(87Sr)/N(86Sr)分别为0.708688、0.708659、 0.708907、0.708223、0.708341、0.708266,平均为0.708514。表明该地层的碳酸盐岩样品可能遭受了不同 程度的成岩蚀变,多数样品的锶同位素组成偏离同时代的全球海水锶同位素组成。

Abstract:

The Triassic black sandstone-slate from the Xinduqiao Formation of Xikang Group,is widely distributed in the Songpan-Ganzi region of western Sichuan. Its division and correlation are difficult because of the monotony of lithology and few of fossils. Based on the principle of strontium isotope stratigraphy(SIS), this paper measured the concentrations of Mn, Sr, SiO2, and the values of 87Sr/ 86Sr ratios for the carbonate rocks interbed in the black sandstone-slate of the Xinduqiao Formation, Xikang Group, northern Ganzi. The strontium isotope datum for the carbonate are 0. 708 688, 0.708 659, 0.708 907, 0.708 223, 0.708 341, 0.708 266 respectively, with an average of 0. 708 514. The carbonates underwent digenetic alteration in different degrees, leading 87Sr/ 86Sr ratios of most samples to have some departures to coeval seawater, but some of them contains the information of seawater geochemically. Therefore, the isotope datum can be used to correlate the strata and to calibrate the age of key position of Xinduqiao Formation of Xikang Group.

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备注/Memo

备注/Memo:

收稿日期:2006-08-03 基金项目:国家自然科学基金项目(40472068);教育部博士点基金项目(20050616005);中国地质调查局地质调查项目(200313000026) 作者简介:曾宜君(1961-),男,四川自贡人,教授级高级工程师,博士研究生,从事区域地质及环境地质研究。E-mail:hsj@cdut.edu.cn

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更新日期/Last Update: 1900-01-01