榴辉岩相高压-超高压变质岩的He同位素地球化学研究现状与问题
Helium isotopic geochemistry of HP-UHP eclogite facies metamorphic rocks： a review
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摘要: 提要： He同位素是区分地壳、地幔物质，研究壳-幔相互作用最灵敏的示踪剂之一，但其在高压-超高压变质作用过程中的地球化学行为目前仍不清楚，因而制约其在榴辉岩研究中的应用。中国作为高压-超高压榴辉岩带分布的重要地区，榴辉岩产出得天独厚，大洋、大陆两种俯冲成因榴辉岩均有分布。本文在归纳榴辉岩相高压-超高压变质岩研究进展的基础上，分析了He同位素示踪在榴辉岩研究中的应用现状。
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关键词:
- He同位素 /
- 榴辉岩 /
- 高压-超高压变质作用 /
Abstract: Abstract：The helium isotopic composition of each sphere of the Earth has its characteristic isotopic ratios. These ratios show significant differences. Therefore, helium isotopes, as a tracer, are more sensitive than other isotopes to distinguishing crust from mantle materials. Up till now, geochemical behaviors of helium isotopes during the HP-UHP metamorphism have not been well studied, it led to the limited application of helium isotope in eclogites. Many HP-UHP eclogite belts have been discovered in China. These eclogites can be genetically classified into two types： one is associated with subduction of the continental slab, and the other is formed by the subduction of the oceanic slab. This paper reviewed the progresses therefore of HP-UHP eclogite facies metamorphic rocks well studied and some problems and future work of the application of helium isotope in eclogites are also discussed.-
Keywords:
- helium /
- isotope geochemistry /
- eclogite /
- HP-UHP metamorphism
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