摘要
超基性岩的地质过程提供了地幔岩在造山带形成过程中所作的贡献,并记录了地质构造以及壳-幔之间相互作用的信息。根据现有的研究,可将俯冲带橄榄岩大致分为陆下地幔橄榄岩、基性-超基性堆晶杂岩和大洋地幔橄榄岩。文中简要评述了不同类型造山带橄榄岩的岩石学和地球化学特征。不同类型的橄榄岩所经历的地质历史不同,而留有不同的岩石学和地球化学特征。大多数造山带橄榄岩经历了高压-超高压变质作用,并受到蛇纹岩化等多期次流体和融体的交代作用,因而俯冲造山带的辉石岩和橄榄岩无论在岩石学的组成、结构和地球化学等特征方面通常表现得复杂多变。
Orogenic ultramafic rocks record the information about geological evolvement and mantle-crust interaction. On the basis of our studies, orogenic peridotites can be classified into subcontinental peridotite, intrusive mafic-ultramafic cumulate complex and oceanic mantle peridotite. This paper briefly comments on the types of orogenic peridotites, their petrological and geochemical characteristics. Each type of peridotite has its specific geological history so that each has its own petrologic and geochemical features. Most peridotites have been subjected to HP-UHP metamorphism and multi episodes of fluid and melting metasomatism including widespread serpentinization. Orogenic pyroxenite and peridotite, therefore, commonly exhibit complicated petrological textures and geochemistry.
出处
《地学前缘》
EI
CAS
CSCD
北大核心
2007年第1期117-124,共8页
Earth Science Frontiers
基金
国家自然科学基金面上资助项目(40372034和40325005)
