中国东部A型花岗岩形成时代及物质来源的Nd—Sr—O同位素地球化学制约

魏春生　郑永飞　赵子福

中国东部A型花岗岩形成时代及物质来源的Nd—Sr—O同位素地球化学制约

魏春生　郑永飞　赵子福

- 魏春生（中国科学技术大学地球与空间科学系化学地球动力学研究实验室, 合肥 230026）　　　　　　郑永飞（中国科学技术大学地球与空间科学系化学地球动力学研究实验室, 合肥 230026）　　　　　　赵子福（中国科学技术大学地球与空间科学系化学地球动力学研究实验室, 合肥 230026）
基金项目:
中国科学院知识创新工程项目(KZCX2-107)、国家自然科学基金(49603043和4003301 0)以及国土资源部壳幔物质组成、相互作用及动力学演化开放研究实验室联合资助成果.

修回日期: 2000-09-20

刊出日期: 2001-02-28

Nd-Sr-O isotopic geochemistr y constraints on the age and origin of the A-type granites in eastern China

WEI ChunSheng,ZHENG YongFei and ZHAO ZiFu.Laboratory for Chemical Geodynamics,Department of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,China

Revised Date: 20 September 2000

Publish Date: 28 February 2001

摘要

摘要: 对中国东部A型花岗岩有代表性的碾子山、山海关、崂山、苏州以及魁岐岩体的Nd-Sr-O同位素地球化学组成进行了系统研究。经过筛选的全岩Rb-Sr等时线拟合结果表明,基本未遭受岩浆期后大气降水交换的苏州和魁岐Rb-Sr等时线年龄分别是108±10Ma和109±5Ma,它们代表岩浆冷却结晶时代。其它遭受热液蚀变较为显著的碾子山、山海关以及崂山岩体Rb-Sr等时线年龄的地质意义不明确。全岩εNd(t)、(87Sr/86Sr)0以及锆石δ18O综合示踪研究表明,中国东部A型花岗岩可能起源于曾经历过高温海水热液交换的再循环下部俯冲洋壳的部分熔融。模型计算结果表明,碾子山、山海关以及崂山等岩体所表现出的εNd(t)-δ18O脱耦变化与大洋沉积物析出流体与下覆辉长岩洋壳之间不同程度的交代有关。在此基础上,提出了中国东部A型花岗岩统一的成因模式,并对其地球动力学意义进行了讨论。
- A型花岗岩 /
- 同位素地球化学 /
- 形成时代 /
- 物质来源 /
- 交代作用 /
- 大气降水 /
- 成因模式 /
- 岩浆
- A-type granite /
- Isotope geochemistry /
- Formation age /
- Source rock /

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中国东部A型花岗岩形成时代及物质来源的Nd—Sr—O同位素地球化学制约

Nd-Sr-O isotopic geochemistr y constraints on the age and origin of the A-type granites in eastern China

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