泰山地区晚太古代“框架侵入岩”的地质特征及稀土地球化学演化

详细信息

刊出日期: 1998-02-15

GEOLOGICAL FEATURES AND REE GEOCHEMICAL EVOIUTION OF LATE ARCHEAN“FRAMEWORK INTRUSIVE ROCKS” IN THE MOUNT TAISHAN AREA

Publish Date: 15 February 1998

摘要: 晚太古代“框架侵入岩”的涵义，是指在晚太古代ＴＴＧ花岗片麻岩和二长花岗片麻岩大片出露的复杂地区，规模甚小但分布较广泛，在建立区域岩石谱系单位序列表时可起到类似“标志层”和骨架作用的中、深色侵入岩类。它们的矿物成分变化基本连续，可能具有某种成因联系或属于一个成因系列；其ＲＥＥ丰度逐渐增高，轻、重稀土分馏程度表现为愈趋显著的总体演化趋势。
Abstract: Late Archean“framework intrusive rocks”refer to meso and melano cratic intrusive rocks which are small in size but relatively widespread in complex areas where Late Archean TTG granitic gneiss and monzogranitic gneiss are exposed in large amounts and which may play a role of the index bed and framework in the establishment of the hierarchy of regional rock unit terms.Their mineral composition is essentially continuous and may have certain genetic relations or belong to a particular genetic series.Their REE abundance increases progressively and their light and heavy REE fractionations also have a general evolutionary trend of becoming more and more marked.
- REE evolutionary trend /
- “framework intrusive rocks” /
- Late Archean