泰山地区新太古代—古元古代地壳演化研究的新进展
NEW ADVANCES IN THE STUDY OF NEOPROTEROZOIC-PALEOPROTEROZOIC CRUSTAL EVOLUTION IN THE TAISHAN AREA
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摘要: 泰山地区在中太古代末发育科马提质和拉斑玄武质绿岩,并强烈褶皱变形和变质。在新太古-古元古代则清楚地表现出5个深成岩浆侵入事件。1800~1700Ma间该区完全刚性化,伴随刚性化地壳再次裂解和济宁沉积凹陷形成,沿断裂系统贯入平直延伸数十公里的辉绿岩脉。Abstract: At the end of the Middle Archean there occurred komatiitic and tholejitic greenstone andstrong folding and metamorphism. The Neoproterozoic-paleoproterozoic clearly witnessed fiveintrusive events of abyssal magmas. Between 1800-1700 Ma B.P. the Taishan area was com-pletely rigidized, accompanied by an additional break-up and formation of the Jining depres-sion. In the study area a straight diabase dike is injected along the fault system and extends upto a few tens of kilorneters.