摘要
大别地块自晚元古代以来主要经受了自北而南的推挤，并且发生了两次较强烈的南移运动，造成了地块前线逆冲滑脱构造体系。特别是中生代的推挤和滑移，不仅构造变形强烈，而且还伴有热事件，大别地块东南缘郯－庐断裂南延部分和广济－宿松平移－推覆型韧性剪切带均是＂热线构造＂，它们提供了深层次岩浆活动的通道。本区岩石以绿片岩－角闪岩相变质岩为主，含金背景值高，逆冲滑脱构造和韧性剪切带的活动与金元素的活化、迁移和富集创造了良好的条件。
The Dabie massif underwent north to south crustal shortening following the late Proterozoic, while two separate periods of large-scale deformation occurred southward. The thrust-decollement system formed the frontal margin of the massif In the Mesozoic strong structural deformation was accompanied by intense thermal activity. On the southeast margin of the massif, the southern Tancheng-Lujiang fault and the Guangi-Susong ductile shear zone, which were inferred as 'hot line structures', provided the pathways of magma intrusion from the depths. Owing to extensive metamorphic rocks of green schist-amphibolite facies and high gold background content in the region, the action of the thrust-decollement system and the ductile shear zone brought about favorable conditions for the subsequent activization,migration, and enrichment of gold.
出处
《大地构造与成矿学》
EI
CAS
CSCD
1994年第2期127-137,共11页
Geotectonica et Metallogenia
关键词
逆冲滑脱构造
金矿床
控制作用
thrust-decollement system, gold deposit, Dabie massif
