大地热流研究揭示的中国地壳成分横向变化

汪洋; 邓晋福

大地热流研究揭示的中国地壳成分横向变化

汪洋,
邓晋福

中国地质大学地球科学与资源学院, 北京 100083

基金项目:

国家自然科学基金项目 49733110

国家自然科学基金项目 49772155

中国地质调查局地质调查项目 K1.4-1-2

中国地质调查局地质调查项目 K1.4-2-2

国土资源部科技发展计划“华北地区岩石圈三维结构及其演化” 20001010202

中国博士后科学基金和国家攀登专项 SSER-Ⅲ-2

详细信息

作者简介:
汪洋(1969-), 男, 博士后, 1999年毕业于中国科学院地质研究所, 获理学博士学位, 现主要从事地热学、岩石学和地球化学研究

中图分类号: P314;P591⁺.1
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出版历程
- 收稿日期: 2001-02-26
- 刊出日期: 2001-11-25

LATERAL VARIATION OF CRUSTAL COMPOSITION IN CHINA AS REVEALED BY HEAT FLOW STUDY

Faculty of Earth Sciences and Mineral Resources, China University of Geosciences, Beijing 100083, China

摘要

摘要: 依据大地热流值、地壳厚度以及大陆壳/幔热流比与地下流体氦同位素比值的相关关系, 计算出中国主要构造单元地壳生热率.同时, 根据Rudnick和Fountain (1995) 的数据得到地壳生热率和SiO₂质量分数的线性关系, 进而利用生热率数据得到地壳SiO₂质量分数.此方法得到的中国东部地壳生热率和SiO₂质量分数与基于地震波速的成分模型相符.中国大陆地壳生热率和SiO₂质量分数横向变化明显, 东部地区地壳为中性成分, 相对富集强不相容元素; 而西北部盆地地壳成分偏于中基性.华北、扬子和塔里木地壳成分差异较大, 克拉通内部表现出明显的成分非均匀性, 褶皱带地壳一般较克拉通略富长英质组分.
- 陆壳成分 /
- 大地热流 /
- 地壳生热率 /
- 成分非均匀性 /
- 中国
Abstract: The crustal heat generation rate of major tectonic units in China are calculated on the basis of heat flow, crustal thickness as well as the inverse relation between the heat flow ratio of continental crust/mantle and the helium isotopic composition of underground fluid. Meanwhile, the linear relation between heat generation (A) and SiO₂ content (w(SiO₂)) of the bulk crust is obtained from the data of Rudnick and Fountain (1995). Then, the w(SiO₂) of China's crust are derived from the w(SiO₂) -A relation. The derived w(SiO₂) and A are in agreement with the values obtained from the seismic velocity-based composition models. There exhibits an obvious lateral variation of heat production and w(SiO₂) in China's crust. The eastern China crustal composition, intermediate, contains relatively concentrated strong incompatible elements, but the crustal composition of the northwestern China basins is prone to be intermediate to mafic. The crustal compositions in North China, Yangtze craton and Tarim platform are different from each other to a relatively great extent. Obvious lateral variation of composition is also present within cratons. The orogenic crust often contains slightly more felsic components than does craton.
- continental crustal composition /
- continental heat flow /
- crustal heat generation rate /
- compositional variation /
- China

HTML全文

图 1 陆壳SiO₂质量分数与其生热率相关关系

Fig. 1. The relation between heat productions and SiO₂ mass fractions in continental crust

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表 1 不同类型大地构造单元地壳SiO₂质量分数和生热率

Table 1. Crustal SiO₂ mass fractions and heat productions of geotectonic types

表 2 中国若干主要构造单元地壳生热率和SiO₂质量分数

Table 2. Heat productions, SiO₂ mass fractions in crust of some major tectonic units in China

表 3 前人发表的中国大陆东部地壳SiO₂质量分数和生热率

Table 3. SiO₂ mass fractions and heat productions of crust of the eastern China

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